An auxiliary tooling for measuring the mirror surface length of the landing gear shock strut

Abstract

An auxiliary tool for measuring the mirror length of the landing gear shock absorber strut. The position where the positioning pointer II points to the measuring scale is the lower end position of the mirror surface of the main landing gear shock absorber strut. Loosening the locking device II allows the positioning column II to slide vertically along the guide sleeve II, facilitating the adjustment of the vertical position. At this time, the telescopic rod II slides simultaneously within the telescopic rod I to match the adjustment of the longitudinal position until the positioning pointer I is adjusted longitudinally to be flush with the upper end surface of the mirror surface of the main landing gear shock absorber strut. By reading the scale value of the measuring scale pointed to by the positioning pointer I, the length value between the positioning pointer I and the positioning pointer II can be obtained, and this length value is the length of the mirror surface of the main landing gear shock absorber strut, improving the efficiency and accuracy of the aircraft weighing work.

Description

Technical Field

[0001] The utility model relates to the field of aircraft maintenance tools, and particularly relates to an auxiliary tooling for measuring the mirror surface length of a landing gear shock absorber strut. Background Art

[0002] When weighing Boeing series aircraft, it is necessary to measure the mirror surface length of the main landing gear shock absorber strut to determine the moment arm of the main landing gear. The calculation formula for the moment arm is: main landing gear moment arm = 706.17 + 0.1034 * DIM“A” (this is the calculation formula for 737NG aircraft. The constants for other aircraft models will vary), where DIM“A” is the mirror surface length of the main landing gear shock absorber strut. The accuracy of measuring the mirror surface length of the main landing gear shock absorber strut will affect the accuracy of the weighing result and the determination of the aircraft's center of gravity position. During the actual aircraft weighing process, the following problems exist: First, there is a risk of scratching the mirror surface of the main landing gear shock absorber strut during the measurement process; Second, due to the lack of a dedicated measuring tool when measuring the mirror surface length, the measurement data is inaccurate; Third, according to the requirements of the WBM manual, aircraft weighing is generally carried out twice (except for special customer requirements). Because of the lack of a dedicated measuring tool and the fact that the mirror surface length is a dynamic value that changes with position, there may be a deviation in the reading angle during the two readings of the measurement data, further affecting the accuracy of the two sets of measurement data. The existence of the above problems not only affects the accuracy of the weighing data, but also affects the overall work efficiency of the company due to the increase in the number of weighings. Summary of the Invention

[0003] In order to overcome the above-mentioned deficiencies in technology, the present invention provides an auxiliary tooling for measuring the mirror surface length of a landing gear shock absorber strut, which is easy to use and improves the work efficiency and accuracy of aircraft weighing.

[0004] The technical solution adopted by the present invention to overcome its technical problems is:

[0005] An auxiliary tooling for measuring the mirror surface length of a landing gear shock absorber strut, comprising:

[0006] A support, on the side end of which a guide sleeve Ⅰ is installed in the horizontal direction, and on the lower end of which a positioning post Ⅱ is arranged in the vertical direction;

[0007] A positioning post Ⅰ is slidably installed in the guide sleeve Ⅰ in the horizontal direction, and a locking device Ⅰ locks the positioning post Ⅰ relative to the guide sleeve Ⅰ. The head end of the positioning post Ⅰ is connected to the upper end of the landing gear shock absorber strut through a connecting device Ⅰ;

[0008] Connecting seat Ⅱ, on the upper end of which a guide sleeve Ⅱ is arranged vertically, a positioning post Ⅱ is slidably inserted vertically into the guide sleeve Ⅱ, a locking device Ⅱ locks and fixes the positioning post Ⅱ relative to the guide sleeve Ⅱ. On the rear end of the connecting seat Ⅱ, a positioning pointer Ⅰ is arranged horizontally, on the lower end of which a measuring scale is arranged vertically, and on the side end of which a positioning post Ⅲ is rotatably installed through a rotating shaft, and the positioning post Ⅲ is arranged horizontally;

[0009] Guide sleeve Ⅲ, which is arranged horizontally, the positioning post Ⅲ is slidably inserted into the guide sleeve Ⅲ. On the lower end of the guide sleeve Ⅲ, a telescopic rod Ⅰ is installed vertically. A telescopic rod Ⅱ is slidably inserted into the telescopic rod Ⅰ, and a locking device Ⅲ locks and fixes the positioning post Ⅲ relative to the guide sleeve Ⅲ;

[0010] Connecting device Ⅱ is installed at the lower end of the telescopic rod Ⅱ, and the connecting device Ⅱ is connected and fixed to the connecting seat Ⅰ of the locking bolt assembly at the mirror surface lower end of the main landing gear shock absorber strut. On the rear end of the connecting device Ⅱ, a positioning pointer Ⅱ is arranged horizontally, and the lower end surface of the positioning pointer Ⅱ is flush with the lower end surface of the mirror surface of the main landing gear shock absorber strut.

[0011] Furthermore, the above-mentioned locking device Ⅰ includes a guide groove Ⅰ arranged horizontally on the positioning post Ⅰ. A threaded hole is arranged on the guide sleeve Ⅰ, and a locking screw Ⅰ is screwed into the threaded hole. The head end of the locking screw Ⅰ is inserted into the guide groove Ⅰ and contacts the bottom of the guide groove Ⅰ.

[0012] Furthermore, the above-mentioned connecting device Ⅰ includes a base arranged at the head end of the positioning post Ⅰ and a screw rod arranged horizontally at the outer side end of the base. The screw rod passes through the positioning hole at the upper end of the landing gear shock absorber strut and is locked and fixed by a nut Ⅰ, and the base contacts the landing gear shock absorber strut.

[0013] Furthermore, the above-mentioned locking device Ⅱ includes a guide groove Ⅱ arranged vertically on the positioning post Ⅱ. A threaded hole is arranged on the guide sleeve Ⅱ, and a locking screw Ⅱ is screwed into the threaded hole. The head end of the locking screw Ⅱ is inserted into the guide groove Ⅱ and contacts the bottom of the guide groove Ⅱ.

[0014] Furthermore, the above-mentioned locking device Ⅲ includes a guide groove Ⅲ arranged horizontally on the positioning post Ⅲ. A threaded hole is arranged on the guide sleeve Ⅲ, and a locking screw Ⅲ is screwed into the threaded hole. The head end of the locking screw Ⅲ is inserted into the guide groove Ⅲ and contacts the bottom of the guide groove Ⅲ.

[0015] Further, the connecting device II includes a threaded hole axially provided at the head end of the telescopic rod II, a disc-shaped turntable, a through hole provided at the central portion of the turntable, a positioning pointer II provided at the rear end of the turntable, an arc-shaped groove provided on the turntable, and a connecting arm. The arc-shaped groove is concentric with the through hole. The bolt I passes through the arc-shaped groove and is then screwed into the threaded hole at the head end of the telescopic rod II. A square hole is provided at the head end of the connecting arm, and a square head bolt is located in the square hole. The square head bolt passes through the through hole and is locked and fixed by a nut III. The bolt II passes through the tail end of the connecting arm and the connecting seat I and is locked and fixed by a nut II.

[0016] The beneficial effects of the present invention are as follows: The position where the positioning pointer II points to the measuring scale is the position of the lower end of the mirror surface of the main landing gear shock absorber strut. Loosening the locking device II allows the positioning column II to slide vertically along the guide sleeve II, facilitating the adjustment of the vertical position. At this time, the telescopic rod II slides simultaneously within the telescopic rod I to match the adjustment of the longitudinal position until the positioning pointer I is adjusted longitudinally to be flush with the upper end surface of the mirror surface of the main landing gear shock absorber strut. By reading the scale value of the measuring scale pointed to by the positioning pointer I, the length value between the positioning pointer I and the positioning pointer II can be obtained, and this length value is the length of the mirror surface of the main landing gear shock absorber strut, improving the efficiency and accuracy of the aircraft weighing work. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural diagram of the use state of the present invention;

[0018] Figure 2 is a three-dimensional structural schematic diagram of the present invention;

[0019] In the figure, 1. Mirror surface of the main landing gear shock absorber strut 2. Landing gear shock absorber strut 3. Connecting seat I 4. Base 5. Positioning column I 6. Guide groove I 7. Guide sleeve I 8. Locking screw I 9. Support 10. Positioning column II 11. Guide groove II 12. Guide sleeve II 13. Set screw II 14. Connecting seat II 15. Positioning column III 16. Guide groove III 17. Guide sleeve III 18. Set screw III 19. Measuring scale 20. Positioning pointer I 21. Telescopic rod I 22. Telescopic rod II 23. Turntable 24. Positioning pointer II 25. Connecting arm 26. Screw rod 27. Nut I 28. Through hole 29. Arc-shaped groove 30. Bolt I 31. Square hole 32. Square head bolt 33. Nut II 34. Bolt II 35. Nut III 36. Rotating shaft. Detailed Embodiment

[0020] The following further describes the present invention in conjunction with the attached Figure 1 、attached Figure 2 drawings.

[0021] An auxiliary tooling for measuring the mirror surface length of a landing gear shock absorber strut, comprising: a support 9, with a guide sleeve I 7 horizontally installed at its side end, and a positioning post II 10 vertically arranged at its lower end; a positioning post I 5, slidably installed horizontally in the guide sleeve I 7, and a locking device I locks the positioning post I 5 relative to the guide sleeve I 7, and the head end of the positioning post I 5 is connected to the upper end of the landing gear shock absorber strut 2 through a connecting device I; a connecting seat II 14, with a guide sleeve II 12 vertically arranged at its upper end, and the positioning post II 10 is slidably inserted vertically into the guide sleeve II 12, and a locking device II locks the positioning post II 10 relative to the guide sleeve II 12, a positioning pointer I 20 is horizontally arranged at the rear end of the connecting seat II 14, a measuring scale 19 is vertically arranged at its lower end, and a positioning post III 15 is rotatably installed at its side end through a rotating shaft, and the positioning post III 15 is horizontally arranged; a guide sleeve III 17, which is horizontally arranged, and the positioning post III 15 is slidably inserted into the guide sleeve III 17, and a telescopic rod I 21 is vertically installed at the lower end of the guide sleeve III 17, and a telescopic rod II 22 is slidably inserted into the telescopic rod I 21, and a locking device III locks the positioning post III 15 relative to the guide sleeve III 17; a connecting device II, installed at the lower end of the telescopic rod II 22, and the connecting device II is fixedly connected to the connecting seat I 3 of the locking bolt assembly at the lower end of the main landing gear shock absorber mirror surface 1, a positioning pointer II 24 is horizontally arranged at the rear end of the connecting device II, and the lower end surface of the positioning pointer II 24 is flush with the lower end surface of the main landing gear shock absorber mirror surface 1. During use, the upper end of the entire auxiliary tooling is fixed to the upper end of the landing gear shock absorber strut 2 through the connecting device I. Loosening the locking device I allows the positioning post I 5 to slide horizontally along the guide sleeve I 7, and loosening the locking device III allows the positioning post III 15 to slide horizontally along the guide sleeve III 17, facilitating the adjustment of the horizontal position. By adjusting the extending length of the telescopic rod II 22 relative to the telescopic rod I 21, it is ensured that the lower end of the entire tooling is fixed to the connecting seat I 3 at the lower end of the main landing gear shock absorber mirror surface 1 through the connecting device II. At this time, the position where the positioning pointer II 24 points to the measuring scale 19 is the lower end position of the main landing gear shock absorber mirror surface 1. Loosening the locking device II allows the positioning post II 10 to slide vertically along the guide sleeve II 12, facilitating the adjustment of the vertical position. At this time, the telescopic rod II 22 slides simultaneously within the telescopic rod I 21 to match the adjustment of the longitudinal position until the positioning pointer I 20 is adjusted to be flush with the upper end surface of the main landing gear shock absorber mirror surface 1 in the longitudinal position. By reading the scale value of the measuring scale 19 pointed to by the positioning pointer I 20, the length value between the positioning pointer I 20 and the positioning pointer II 24 can be obtained, and this length value is the length of the main landing gear shock absorber mirror surface 1, improving the efficiency and accuracy of the aircraft weighing work.

[0022] The locking device I can be of the following structure, which includes a guide groove I 6 arranged horizontally on the positioning post I 5. A threaded hole is provided on the guide sleeve I 7, and the locking screw I 8 is screwed into the threaded hole. The head end of the locking screw I 8 is inserted into the guide groove I 6 and contacts the bottom of the guide groove I 6. When the locking screw I 8 is tightened, the head end of the locking screw I 8 contacts the guide groove I 6, and at this time, the locking force is used to lock and fix the guide sleeve I 7 and the positioning post I 5. After loosening the locking screw I 8, the positioning post I 5 can slide along the guide sleeve I 7, and the head end of the locking screw I 8 slides in the guide groove I 6, playing a guiding role.

[0023] The connecting device I can be of the following structure, which includes a base 4 arranged at the head end of the positioning post I 5 and a screw rod 26 arranged horizontally at the outer end of the base 4. The screw rod 26 passes through the positioning hole at the upper end of the landing gear shock absorber strut 2 and is locked and fixed by a nut I 27. The base 4 contacts the landing gear shock absorber strut. By installing and fixing the screw rod 26 through the positioning hole at the upper end of the landing gear shock absorber strut 2 and then screwing the nut I 27, the structure is simple and the installation and disassembly are convenient.

[0024] The locking device II can be of the following structure, which includes a guide groove II 11 arranged vertically on the positioning post II 10. A threaded hole is provided on the guide sleeve II 12, and the locking screw II 13 is screwed into the threaded hole. The head end of the locking screw II 13 is inserted into the guide groove II 11 and contacts the bottom of the guide groove II 11. When the locking screw II 13 is tightened, the head end of the locking screw II 13 contacts the guide groove II 11, and at this time, the locking force is used to lock and fix the guide sleeve II 11 and the positioning post II 10. After loosening the locking screw II 13, the positioning post II 10 can slide along the guide sleeve II 12, and the head end of the locking screw II 13 slides in the guide groove II 11, playing a guiding role.

[0025] The locking device III can be of the following structure, which includes a guide groove III 16 arranged horizontally on the positioning post III 15. A threaded hole is provided on the guide sleeve III 17, and the locking screw III 18 is screwed into the threaded hole. The head end of the locking screw III 18 is inserted into the guide groove III 16 and contacts the bottom of the guide groove III 16. When the locking screw III 18 is tightened, the head end of the locking screw III 18 contacts the guide groove III 16, and at this time, the locking force is used to lock and fix the guide sleeve III 17 and the positioning post III 15. After loosening the locking screw III 18, the positioning post III 15 can slide along the guide sleeve III 17, and the head end of the locking screw III 18 slides in the guide groove III 16, playing a guiding role.

[0026] The connecting device II can have the following structure. It includes a threaded hole axially arranged at the head end of the telescopic rod II 22, a disc-shaped turntable 23, a through hole 28 arranged at the central part of the turntable 23, a positioning pointer II 24 arranged at the rear end of the turntable 23, an arc-shaped groove 29 arranged on the turntable 23, and a connecting arm 25. The arc-shaped groove 29 is concentric with the through hole 28. The bolt I 30 passes through the arc-shaped groove 29 and is screwed into the threaded hole at the head end of the telescopic rod II 22. A square hole 31 is arranged at the head end of the connecting arm 25. The square head bolt 32 is located in the square hole 31. The square head bolt 32 passes through the through hole 28 and is locked and fixed by a nut III 35. The bolt II 34 passes through the tail end of the connecting arm 25 and the connecting seat I 3 and is locked and fixed by a nut II 33. The connecting arm 25 is installed and fixed to the connecting seat I 3 through the bolt II 34 and the nut II 33, which is convenient for installation and disassembly. After loosening the bolt I 30 and the nut III 35, the turntable 23 can be rotated. The bolt I 30 slides in the arc-shaped groove 29, which can facilitate the adjustment of the angle of the positioning pointer II 24 so that it rotates to be parallel to the measuring scale 19, thus facilitating reading. After the adjustment is in place, lock the bolt I 30 and the nut III 35.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An auxiliary tool for measuring the mirror length of the shock strut of an undercarriage, characterized in that Comprising: A support (9), on the side end of which a guide sleeve I (7) is horizontally installed, and on the lower end of which a positioning post II (10) is vertically arranged; A positioning post I (5) is horizontally slidably installed in the guide sleeve I (7), and a locking device I locks and fixes the positioning post I (5) relative to the guide sleeve I (7). The head end of the positioning post I (5) is connected to the upper end of the landing gear shock absorber strut (2) through a connecting device I; A connecting seat II (14), on the upper end of which a guide sleeve II (12) is vertically arranged. The positioning post II (10) is vertically slidably inserted into the guide sleeve II (12), and a locking device II locks and fixes the positioning post II (10) relative to the guide sleeve II (12). On the rear end of the connecting seat II (14), a positioning pointer I (20) is horizontally arranged, on the lower end of which a measuring scale (19) is vertically arranged. On the side end of it, a positioning post III (15) is rotatably installed through a rotating shaft, and the positioning post III (15) is horizontally arranged; A guide sleeve III (17) is horizontally arranged. The positioning post III (15) is slidably inserted into the guide sleeve III (17). On the lower end of the guide sleeve III (17), a telescopic rod I (21) is vertically installed. A telescopic rod II (22) is slidably inserted into the telescopic rod I (21), and a locking device III locks and fixes the positioning post III (15) relative to the guide sleeve III (17); A connecting device II is installed at the lower end of the telescopic rod II (22), and the connecting device II is connected and fixed to the connecting seat I (3) of the locking bolt assembly at the lower end of the main landing gear shock absorber mirror surface (1). On the rear end of the connecting device II, a positioning pointer II (24) is horizontally arranged, and the lower end surface of the positioning pointer II (24) is flush with the lower end surface of the main landing gear shock absorber mirror surface (1).

2. The auxiliary tooling for measuring the mirror surface length of the landing gear shock strut according to claim 1, wherein: The locking device I includes a guide groove I (6) horizontally arranged on the positioning post I (5). A threaded hole is arranged on the guide sleeve I (7), and a locking screw I (8) is screwed into the threaded hole. The head end of the locking screw I (8) is inserted into the guide groove I (6) and contacts the bottom of the guide groove I (6).

3. The auxiliary tooling for measuring the mirror length of the landing gear shock strut according to claim 1, wherein: The connecting device I includes a base (4) arranged at the head end of the positioning post I (5) and a screw rod (26) horizontally arranged at the outer side end of the base (4). After the screw rod (26) passes through the positioning hole at the upper end of the landing gear shock absorber strut (2), it is locked and fixed by a nut I (27), and the base (4) contacts the landing gear shock absorber strut.

4. The auxiliary tooling for measuring the mirror length of the landing gear shock strut according to claim 1, wherein: The locking device II includes a guide groove II (11) vertically arranged on the positioning post II (10). A threaded hole is arranged on the guide sleeve II (12), and a locking screw II (13) is screwed into the threaded hole. The head end of the locking screw II (13) is inserted into the guide groove II (11) and contacts the bottom of the guide groove II (11).

5. The auxiliary tooling for measuring the mirror length of the landing gear shock strut according to claim 1, characterized in that: The locking device III includes a guide groove III (16) horizontally arranged on the positioning post III (15). A threaded hole is arranged on the guide sleeve III (17), and a locking screw III (18) is screwed into the threaded hole. The head end of the locking screw III (18) is inserted into the guide groove III (16) and contacts the bottom of the guide groove III (16).

6. The auxiliary tooling for measuring the mirror surface length of the landing gear shock strut according to claim 1, wherein: The connecting device II includes a screw hole axially arranged at the head end of the telescopic rod II (22), a disc-shaped turntable (23), a through hole (28) arranged at the central part of the turntable (23), a positioning pointer II (24) arranged at the rear end of the turntable (23), an arc-shaped groove (29) arranged on the turntable (23), and a connecting arm (25). The arc-shaped groove (29) is concentric with the through hole (28). The bolt I (30) passes through the arc-shaped groove (29) and is screwed into the screw hole at the head end of the telescopic rod II (22). A square hole (31) is arranged at the head end of the connecting arm (25). The square head bolt (32) is located in the square hole (31). After passing through the through hole (28), the square head bolt (32) is locked and fixed by a nut III (35). The bolt II (34) passes through the tail end of the connecting arm (25) and the connecting seat I (3) and is locked and fixed by a nut II (33).

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