Enclosed compartment joint gap measurement device and method

Abstract

A device and method for measuring the gap between closed compartments is disclosed, belonging to the field of industrial automation production technology. This invention addresses the difficulty and complexity of measuring and calculating gap distances in existing technologies. The invention simulates the fitting process using a closed thermal protection model and a closed compartment model, employing multiple gap measuring instruments to simultaneously collect characteristic data of the fitting area. By analyzing this characteristic data, the current gap condition is determined, and the gap is adjusted to the target range. This invention is primarily used for measuring the gap between closed compartments in high-speed aircraft.

Description

Technical Field

[0001] This invention relates to the field of industrial automation production technology, specifically to a device and method for measuring the gap between closed compartments. Background Technology

[0002] With the continuous development of modern science, high-speed aircraft have also entered a stage of rapid development. In the design and manufacturing of high-speed aircraft, considering the thermal insulation performance of the aircraft's surface is one of the key research and development focuses. Early thermal insulation layers were often prepared in sections and partially bonded together for installation. However, this installation method reduces the bonding strength at the joints, posing a risk of failure. Therefore, current thermal protection installations are mostly based on integral preparation and installation.

[0003] The enclosed compartments and thermal protection layers of high-speed aircraft are mostly sealed structures, requiring installation only through a fitting process. Before fitting, adhesive must be applied to the edges of the compartment and the thermal protection material. If misalignment occurs between the enclosed compartment and the thermal protection material during the fitting process, it may lead to fitting failure. It may also result in some areas having larger seams than others, ultimately causing adhesive to be squeezed out or insufficient in some areas, significantly affecting the bonding effect.

[0004] Based on current technology, measuring the gap between the enclosed compartment and the thermal protection is difficult and complex. There is a need to develop a simple, feasible, and safe method for measuring the gap between the enclosed compartment and the thermal protection. Summary of the Invention

[0005] To overcome the difficulties and complexities of measuring the connection gap between enclosed compartments and thermal protection in existing technologies, this invention provides a device and method for measuring the connection gap of enclosed compartments.

[0006] The first aspect of the present invention provides a device for measuring the gap between closed compartment fittings, comprising:

[0007] Enclosed thermal protection fixing frame, enclosed compartment fixing frame, measuring instrument mounting panel, measuring instrument mounting bracket, clearance measuring instrument;

[0008] The fixed frame of the enclosed compartment and the fixed frame of the enclosed thermal protection are connected by a sliding connection mechanism;

[0009] The measuring instrument mounting panel and the enclosed thermal protection fixing frame are connected by a telescopic connection mechanism, and the measuring instrument mounting panel and the enclosed thermal protection fixing frame remain perpendicular.

[0010] The gap measuring instrument is fixed to the measuring instrument mounting panel using a measuring instrument mounting bracket.

[0011] The enclosed thermal protection model is fixed inside the enclosed thermal protection fixed frame;

[0012] The enclosed compartment model is fixed inside the enclosed compartment's fixed frame.

[0013] Furthermore, the measuring instrument mounting bracket includes a fixed base, a rotating base, and an instrument fixing plate;

[0014] The fixed base is provided with screw holes that are compatible with the mounting panel of the measuring instrument;

[0015] The rotating base is provided with an arc-shaped slot and a locking screw. The fixed base is connected to the rotating base through a threaded connection structure. The fixed base and the rotating base can open and close along the arc-shaped slot, and the opening and closing angle is not less than 45 degrees.

[0016] The instrument mounting plate is fixedly connected to the rotating base via a threaded connection structure, and the instrument mounting plate is provided with an installation interface for supporting the gap measuring instrument.

[0017] Furthermore, the measuring instrument mounting panel is provided with a strip-shaped mounting hole and a central hole. The strip-shaped mounting hole is vertically oriented toward the axis of the enclosed compartment, and the length of the strip-shaped mounting hole is not less than 40mm.

[0018] Furthermore, the horizontal distance between the measuring instrument mounting panel and the heat-sealed protective fixing frame is 100mm-150mm.

[0019] Furthermore, the horizontal distance between the enclosed thermal protection model and the enclosed compartment model does not exceed 30mm.

[0020] Furthermore, the gap measuring instrument is a laser profilometer.

[0021] Furthermore, the number of gap measuring instruments is at least three, and the multiple gap measuring instruments are arranged circumferentially in a ring array. Their installation angles and positions are adjusted in coordination with the rotating base and the instrument fixing plate to form a comprehensive measurement layout for the full circumferential gap between the closed thermal protection model and the closed compartment model.

[0022] A second aspect of the present invention provides a method for measuring the fitting gap of a closed compartment using a fitting gap measuring device, wherein the measuring device includes a fitting gap measuring device for a closed compartment as described in any one of the first aspects above.

[0023] The measurement process of the method for measuring the gap between the closed compartment sections is as follows:

[0024] S1: Adjust the measuring device to align the axis of the closed thermal protection model with that of the closed compartment model. Then, the host computer sends a synchronization signal, and all gap measuring instruments start simultaneously to scan the splicing edge surface of the closed thermal protection and the closed compartment. The endpoint of the measuring beam emitted by the gap measuring instrument is the measuring point.

[0025] Determine the vertical projection points of the measurement point and the starting point of the measurement beam emitted by the gap measuring instrument on the enclosed compartment, and calculate the distance between the two projection points, denoted as the projection point distance; obtain the coordinates of the measurement point within the field of view of the gap measuring instrument;

[0026] S2: Calculate the difference between the distances of the corresponding projection points of two adjacent measurement points. When the difference is greater than a set threshold, determine that the two adjacent measurement points are edge points. Among the two edge points, the edge point with the smaller line distance to the gap measuring instrument is located on the closed thermal protection, and the other edge point is located on the closed compartment.

[0027] S3: Perform linear fitting on the straight-line distance data and coordinate data of all measurement points to obtain the fitting result, and then calculate the sealing section fitting gap based on the fitting result and the edge point data of all closed thermal protection.

[0028] Furthermore, the step of performing linear fitting on the straight-line distance data and coordinate data at all measurement points includes:

[0029] First, obtain the sets of straight-line distances mentioned in step S1. The set of coordinates of each measuring point within the field of view of the gap measuring instrument. :

[0030] ;

[0031] ;

[0032] In the formula, Indicates the distance to the projection point. This indicates the coordinates of the measurement point within the field of view of the gap measuring instrument (5), where i represents the instrument number and j represents the measurement point number. n This represents the total number of measurement points.

[0033] Then, the linear least squares fitting method was used to... , Perform linear fitting, the fitting model is as follows The slope was obtained by fitting the data. ,intercept The specific calculation process includes:

[0034] ;

[0035] ;

[0036] ;

[0037] ;

[0038] In the formula, Represents a set The mean of all elements in the set. Represents a set The mean of all elements in the set.

[0039] Furthermore, the specific method for calculating the sealing section fitting gap at this edge point location based on the fitting results and edge point data on all the sealed thermal protection in step S3 is as follows:

[0040] Based on the straight-line distance data and coordinate data of the upper edge point of the closed thermal protection, and the slope and intercept Calculate the clearance between enclosed sections at the current edge point location. The calculation formula is as follows:

[0041] .

[0042] The beneficial effects of this invention are as follows: This invention provides a device and method for measuring the fitting gap between a closed compartment and a closed thermal protection unit. By using a closed thermal protection model and a closed compartment model to simulate the fitting gap between the closed thermal protection unit and the closed compartment, multiple gap measuring instruments are used to simultaneously collect characteristic data of the fitting area. By analyzing the characteristic data, the current fitting gap is determined, and the gap is adjusted to the target range. This solves the problem of the difficulty and complexity of calculating the fitting gap distance between the closed compartment and the closed thermal protection unit using existing technologies. The device of this invention is simple, safe, and easy to operate. It can quickly measure the fitting gap at different positions between the closed compartment and the closed thermal protection unit. Based on the measured fitting gap results, the position of the closed compartment is adjusted to make the fitting gap uniform, thereby improving the success rate of fitting the closed compartment and the thermal protection unit and ensuring the bonding effect between the closed compartment and the thermal protection unit. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a closed compartment sleeve gap measuring device according to the present invention;

[0045] Figure 2 This is a schematic diagram of the measuring instrument mounting bracket structure in the closed compartment socket gap measuring device of the present invention. Detailed Implementation

[0046] This invention discloses a device and method for measuring the gap between closed compartments, used to measure the gap between closed thermal protection and closed compartments.

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention. Specific Implementation Method 1

[0049] For ease of understanding, specific embodiments of the present invention are described below. Please refer to [link / reference]. Figure 1 , Figure 2 The structural schematic diagram of the closed compartment sleeve gap measuring device in this embodiment of the invention includes:

[0050] 1. Enclosed thermal protection fixing frame; 2. Enclosed compartment fixing frame; 3. Measuring instrument mounting panel; 4. Measuring instrument mounting bracket; 5. Clearance measuring instrument.

[0051] The enclosed compartment fixing frame 2 and the enclosed thermal protection fixing frame 1 are connected by a sliding connection mechanism;

[0052] The measuring instrument mounting panel 3 and the enclosed thermal protection fixing frame 1 are connected by a telescopic connection mechanism, and the measuring instrument mounting panel 3 and the enclosed thermal protection fixing frame 1 are kept perpendicular.

[0053] The gap measuring instrument 5 is fixed to the measuring instrument mounting panel 3 using the measuring instrument mounting bracket 4;

[0054] The closed thermal protection model 6 and the closed compartment model 7 are used to simulate the closed thermal protection and closed compartment in actual measurement. By adjusting the position of these two models, the connection position of the closed thermal protection and the closed compartment and the corresponding gap of the connection position are simulated.

[0055] The enclosed thermal protection model 6 is fixed inside the enclosed thermal protection fixed frame 1;

[0056] The enclosed compartment model 7 is fixed inside the enclosed compartment fixed frame 2.

[0057] As an optional embodiment, the measuring instrument mounting bracket 4 includes a fixed base 401, a rotating base 402, and an instrument fixing plate 403;

[0058] The fixed base 401 is provided with screw holes that are compatible with the measuring instrument mounting panel 3;

[0059] The rotating base 402 is provided with an arc-shaped slot and a locking screw. The fixed base 401 is connected to the rotating base 402 through a threaded connection structure. The fixed base 401 and the rotating base 402 can open and close along the arc-shaped slot, and the opening and closing angle is not less than 45 degrees.

[0060] The instrument fixing plate 403 and the rotating base 402 are fixedly connected by a threaded connection structure. The instrument fixing plate 403 is provided with an installation interface for supporting the gap measuring instrument 5.

[0061] As an optional embodiment, the measuring instrument mounting panel 3 has a strip-shaped mounting hole and a central hole. The strip-shaped mounting hole is vertically oriented towards the axis of the enclosed compartment model 7. The measuring instrument mounting bracket 4 can move along the strip-shaped mounting hole and rotate through the central hole. After adjustment, it is locked with screws. This configuration allows the position of the gap measuring instrument 5 to be adjusted without disassembling the measuring instrument mounting panel 3. Within the installable area of ​​the measuring instrument mounting panel 3, the length of the strip-shaped mounting hole is not less than 40mm.

[0062] As an optional embodiment, the horizontal distance between the measuring instrument mounting panel 3 and the heat-sealed protective fixing frame 1 is 100mm-150mm.

[0063] As an optional embodiment, the horizontal distance between the enclosed thermal protection model 6 and the enclosed compartment model 7 does not exceed 30mm.

[0064] As an optional embodiment, the gap measuring instrument 5 is a laser profilometer.

[0065] As an optional embodiment, this embodiment uses three gap measuring instruments 5, arranged circumferentially in a ring array. Their installation angles and positions are adjusted collaboratively by the rotating base 402 and the instrument fixing plate 403 to form a comprehensive measurement layout covering the entire circumferential gap between the enclosed thermal protection model 6 and the enclosed compartment model 7. In practical applications, more than three gap measuring instruments 5 can be used; three are used here, which is sufficient to cover the tested socket area, saving equipment costs. Specific Implementation Method Two

[0067] The present invention also provides a method for measuring the fitting gap of a closed compartment using the above-mentioned closed compartment fitting gap measuring device. The method for measuring the fitting gap uses a closed thermal protection model 6 and a closed compartment model 7 to simulate the actual measured closed thermal protection and closed compartment. The specific operation process is as follows:

[0068] The position of the fixed frame 2 of the closed compartment is adjusted by the sliding connection mechanism to simulate the connection gap between the closed thermal protection model 6 and the closed compartment model 7, so that the axis of the closed thermal protection model and the closed compartment model are aligned.

[0069] The extension length of the measuring instrument mounting panel 3 is adjusted by the telescopic connecting mechanism, and the measuring instrument mounting panel 3 remains perpendicular to the closed thermal protection fixing frame 1.

[0070] Fix the gap measuring instrument 5 to the measuring instrument mounting panel 3 via the measuring instrument mounting bracket 4, move the fixed base 401 along the elongated hole on the measuring instrument mounting panel 3, and adjust the rotating base 402 so that the field of view of the gap measuring instrument 5 covers the model socket area. Then use the locking screw to fix the rotating base 402 through the arc-shaped hole.

[0071] Multiple measuring instrument mounting brackets 4 and gap measuring instruments 5 are arranged around the measuring instrument mounting panel 3. The field of view angle of each gap measuring instrument 5 is adjusted by rotating the base 402 to form full coverage of the gap field of view between the closed thermal protection model 6 and the closed compartment model 7.

[0072] After completing the above steps, you can begin scanning and measuring. The specific steps include:

[0073] S1: Adjust the measuring device to align the axis of the closed thermal protection model with that of the closed compartment model. Then, the host computer sends a synchronization signal, and all gap measuring instruments start simultaneously to scan the splicing edge surface of the closed thermal protection and the closed compartment. The endpoint of the measuring beam emitted by the gap measuring instrument is the measuring point.

[0074] Determine the vertical projection points of the measurement point and the starting point of the measurement beam emitted by the gap measuring instrument on the enclosed compartment, and calculate the distance between the two projection points, denoted as the projection point distance; obtain the coordinates of the measurement point within the field of view of the gap measuring instrument;

[0075] S2: Calculate the difference between the distances of the corresponding projection points of two adjacent measurement points. When the difference is greater than a set threshold, determine that the two adjacent measurement points are edge points. Among the two edge points, the edge point with the smaller line distance to the gap measuring instrument is located on the closed thermal protection, and the other edge point is located on the closed compartment.

[0076] S3: Perform linear fitting on the straight-line distance data and coordinate data of all measurement points to obtain the fitting result, and then calculate the fitting gap of the closed compartment based on the fitting result and the edge point data of all closed thermal protection:

[0077] First, obtain the sets of straight-line distances mentioned in step S1. The set of coordinates of each measuring point within the field of view of the gap measuring instrument. :

[0078] ;

[0079] ;

[0080] In the formula, Indicates the distance to the projection point. This indicates the coordinates of the measurement point within the field of view of the gap measuring instrument, where i represents the instrument number and j represents the measurement point number. n This represents the total number of measurement points.

[0081] The above coordinate set ,coordinate All measurements used were taken from the x-coordinates of the measurement points observed within the field of view of the measuring instrument.

[0082] Then, the linear least squares fitting method was used to... , Perform linear fitting, the fitting model is as follows The slope was obtained by fitting the data. ,intercept The specific calculation process includes:

[0083] ;

[0084] ;

[0085] ;

[0086] ;

[0087] In the formula, Represents a set The mean of all elements in the set. Represents a set The mean of all elements in the set.

[0088] Then, based on the straight-line distance data, coordinate data, and slope of the upper edge point of the closed thermal protection, and intercept Calculate the clearance between enclosed sections at the current edge point location. The calculation formula is as follows:

[0089] .

[0090] The positional relationship between the enclosed thermal protection and the enclosed compartment is determined based on the positive and negative signs of the gap between the enclosed sections. The position of the enclosed compartment model 7 is then adjusted according to this relationship. The specific operation process is as follows:

[0091] when When the value is positive, it indicates that the outer surface of the enclosed section is completely inside the enclosed thermal protection.

[0092] when When the value is negative, it indicates that the outer surface of the enclosed compartment has protruded beyond the outer side of the enclosed thermal protection.

[0093] In this embodiment, three gap measuring instruments 5 were used, so three measurement results were obtained, namely: .when When all values ​​are positive, it indicates that the enclosed compartment is completely inside the enclosed thermal protection system. In this case, it can be determined according to... The values ​​are used to make minor adjustments to the position of the enclosed compartments, so that... If the size difference is within the threshold range, it indicates that the adjusted socket gap is uniform.

[0094] when When a negative value appears, it indicates that the outer surface of the enclosed compartment within the detection range of the gap measuring instrument 5 has exceeded the inner surface of the enclosed thermal protection. The position of the enclosed compartment needs to be adjusted to ensure the corresponding... The value changes from negative to positive, and If the size difference is within the threshold range, it indicates that the adjusted socket gap is uniform.

[0095] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring the fitting gap of a closed compartment using a fitting gap measuring device, characterized in that, The method is implemented using a closed compartment fitting gap measuring device, which includes: Enclosed thermal protection fixing frame (1), enclosed compartment fixing frame (2), measuring instrument mounting panel (3), measuring instrument mounting bracket (4), gap measuring instrument (5); The closed compartment fixing frame (2) and the closed thermal protection fixing frame (1) are connected by a sliding connection mechanism; The measuring instrument mounting panel (3) is connected to the closed thermal protection fixing frame (1) by a telescopic connection mechanism, and the measuring instrument mounting panel (3) and the closed thermal protection fixing frame (1) remain perpendicular. The gap measuring instrument (5) is fixed to the measuring instrument mounting panel (3) using the measuring instrument mounting bracket (4); The enclosed thermal protection is fixed inside the enclosed thermal protection fixing frame (1); the enclosed compartment is fixed inside the enclosed compartment fixing frame (2); The measurement process for measuring the gap between closed compartments includes: S1: The host computer sends a synchronization signal, and all gap measuring instruments (5) start at the same time to scan the socket edge surface of the closed thermal protection and closed compartment. The end point of the measuring beam emitted by the gap measuring instrument (5) is the measuring point. Determine the vertical projection point of the measurement point and the starting point of the measurement beam emitted by the gap measuring instrument (5) on the closed section, and calculate the distance between the two projection points, which is recorded as the projection point distance; obtain the coordinates of the measurement point in the field of view of the gap measuring instrument (5); S2: Calculate the difference between the distances of the corresponding projection points of two adjacent measurement points. When the difference is greater than the set threshold, determine that the two adjacent measurement points are edge points. Among the two edge points, the edge point with the smaller line distance to the gap measuring instrument (5) is located on the closed thermal protection, and the other edge point is located on the closed compartment. S3: Perform linear fitting on the straight-line distance data and coordinate data of all measurement points to obtain the fitting result, and then calculate the sealing section fitting gap based on the fitting result and the edge point data of all closed thermal protection. The steps for performing linear fitting on the straight-line distance data and coordinate data at all measurement points include: First, obtain the sets of straight-line distances mentioned in step S1. The set of coordinates of each measuring point within the field of view of the gap measuring instrument (5). : ； ； In the formula, Indicates the distance to the projection point. The coordinates of the measurement point within the field of view of the gap measuring instrument (5) are represented by i, i represents the measuring instrument number, j represents the sequence number of the measurement point, and n is the total number of measurement points. Then, the linear least squares fitting method was used to... , Perform linear fitting, the fitting model is as follows The slope was obtained by fitting the data. ,intercept The specific calculation process includes: ； ； ； ； In the formula, Represents a set The mean of all elements in the set. Represents a set The mean of all elements in the set.

2. The method according to claim 1, characterized in that, The measuring instrument mounting bracket (4) includes a fixed base (401), a rotating base (402), and an instrument fixing plate (403); The fixed base (401) is provided with screw holes that are compatible with the measuring instrument mounting panel (3); The rotating base (402) is provided with an arc-shaped slot and a locking screw. The fixed base (401) is connected to the rotating base (402) through a threaded connection structure. The fixed base (401) and the rotating base (402) can open and close along the arc-shaped slot, and the opening and closing angle is not less than 45 degrees. The instrument fixing plate (403) and the rotating base (402) are fixedly connected by a threaded connection structure. The instrument fixing plate (403) is provided with an installation interface for supporting the gap measuring instrument (5).

3. The method according to claim 2, characterized in that, The measuring instrument mounting panel (3) is provided with a strip mounting hole and a central hole. The strip mounting hole is vertically oriented toward the axis of the enclosed compartment, and the length of the strip mounting hole is not less than 40mm.

4. The method according to claim 3, characterized in that, The horizontal distance between the measuring instrument mounting panel (3) and the closed thermal protection fixing frame (1) is 100mm-150mm.

5. The method according to claim 4, characterized in that, The horizontal adjustment distance between the enclosed thermal protection and the enclosed compartment shall not exceed 30mm.

6. The method according to claim 5, characterized in that, The gap measuring instrument (5) is a laser profilometer.

7. The method according to claim 6, characterized in that, The number of gap measuring instruments (5) is at least 3. Multiple gap measuring instruments (5) are arranged circumferentially in a ring array. Their installation angle and position are adjusted by the rotating base (402) and the instrument fixing plate (403) to form a full-circumferential gap measurement layout covering the closed thermal protection and closed compartment.

8. The method according to claim 1, characterized in that, Step S3, based on the fitting results and edge point data of all enclosed thermal protection, calculates the sealing section fitting gap at this edge point location using the following method: Based on the straight-line distance data and coordinate data of the upper edge point of the closed thermal protection, and the slope and intercept Calculate the clearance between enclosed sections at the current edge point location. The calculation formula is as follows: 。

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