Horizontal measuring device for fuselage of small aircraft

Abstract

The invention relates to the technical field of aircraft measurement, in particular to a small aircraft fuselage levelness measuring device which comprises a workbench and two lens assemblies, a portal frame is fixedly connected to the top end of the workbench, two first ruler panels are fixedly arranged on the side wall of the portal frame, and an air cylinder is fixedly arranged in the middle of the top end of the portal frame; the output end of the air cylinder penetrates through the portal frame and is fixedly connected with an installation base, first pointers are fixedly arranged on the side walls, close to the first ruler panel, of the installation base, two sliding grooves are formed in the surface of the installation base, sliding blocks are symmetrically and slidably connected into the two sliding grooves, and the top ends of the sliding blocks are fixedly connected with first supporting bases to form an integrated structure. Through cooperation of the workbench, the portal frame, the first ruler panel, the mounting base, the air cylinder, the lens assembly, the first pointer, the sliding block, the first supporting base, the rotating table, the threaded column and the connecting assembly, the convenience of mounting, positioning and measuring of the lens assembly is improved, and the machine body measuring efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft measurement, in particular to a small aircraft fuselage level measurement device. Background Art

[0002] Small aircraft usually refers to light aircraft suitable for transporting a small number of passengers or cargo, usually used for private flights, training, short trips, medical rescue and other purposes. According to the size and purpose, small aircraft can be divided into the following types: trainer aircraft, sports aircraft and drones. During the production and use of small aircraft, a horizontal measuring device is required to detect the level of the fuselage, so as to ensure that the aircraft is stable and safe during the flight. The level measurement of the fuselage can be measured by a level. The level is an instrument that establishes a horizontal line of sight to measure the height difference between two points, thereby realizing the level measurement of the fuselage of a small aircraft.

[0003] The patent document with the announcement number CN219530238U in my country discloses a measuring level, including a level body and a support leg at the bottom of the level body, a stabilizing mechanism is arranged on the side of the support leg away from the level body, the stabilizing mechanism includes a fixing box, one side of the fixing box is fixedly connected to the side of the support leg away from the level body, a fixing block is fixedly connected to the bottom outer wall of the fixing box, a rubber plate is fixedly connected to the bottom of the fixing block, a sliding box is slidably connected to the inner wall of the fixing box, a pressing rod is fixedly connected to the top of the sliding box, and the top of the pressing rod is located outside the top of the fixing box. The utility model relates to the technical field of level. The measuring level solves the problem that most existing measuring levels are supported by a tripod, thus preventing poor stability on the ground, sliding whenever there is a slight slope, and sliding more seriously when encountering muddy and sandy ground, thus bringing cumbersome operation problems to the measurement.

[0004] This patent uses a tripod to install and position the level lens assembly. Since the fuselage of a small aircraft is usually streamlined and the two points for horizontal measurement are usually symmetrically distributed, the operator needs to first install the positioning tripod to facilitate simultaneous observation of the two points, and then install the fixed tripod. The installation and positioning is time-consuming and labor-intensive, which affects the efficiency and accuracy of the horizontal measurement of the small aircraft fuselage. Summary of the invention

[0005] Based on this, it is necessary to provide a small aircraft fuselage level measuring device to address the existing technical problems.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] A device for measuring the level of a small aircraft fuselage comprises a workbench and two lens assemblies, wherein a gantry is fixedly connected to the top of the workbench, two scale panels are fixedly arranged on the side walls of the gantry, a cylinder is fixedly arranged at the middle position of the top of the gantry, the output end of the cylinder passes through the gantry and is fixedly connected to a mounting seat, a pointer is fixedly arranged on the side wall of the mounting seat close to the scale panel, two slide grooves are arranged on the surface of the mounting seat, sliders are symmetrically slidably connected to the inside of the two slide grooves, the tops of the sliders are fixedly connected to a first support seat to form an integrated structure, the middle of the first support seat is rotatably connected to a rotating table, three threaded columns are fixedly connected to the top of the rotating table at equal intervals, and the tops of the threaded columns are provided with connecting components The two lens assemblies each include a base, a lens barrel is fixedly provided in the middle of the top end of the base, one end of the lens barrel is threadedly connected to an objective lens, and the other end of the lens barrel is threadedly connected to an eyepiece, a level bubble is fixedly provided on the base near the top end of the lens barrel, the midlines of the objective lens, the lens barrel and the eyepiece are respectively level with the top ends of the two pointers, the connecting components each include an outer shell body threadedly connected to the outer surface of a threaded column, a thread groove is provided at the bottom end of the outer shell body, the internal dimensions of the thread groove are respectively matched with the external dimensions of the threaded column, a sphere is fixedly connected to the top end of the outer shell body to form an integrated structure, a groove is provided at the bottom end of the base near the sphere for the sphere to be clamped, and the external dimensions of the sphere are respectively matched with the internal dimensions of the groove.

[0008] Furthermore, the workbench and the gantry are both made of cast iron, the gantry is in a convex shape and perpendicular to the workbench, and the two scale panels are symmetrically distributed and perpendicular to the workbench and the pointer in turn.

[0009] Furthermore, a slot 1 is provided on the side wall of the gantry for the two ends of the mounting seat to be clamped, and the external dimensions of the two ends of the mounting seat are adapted to the internal dimensions of the slot 1 in turn, thereby improving the stability of the vertical movement of the mounting seat.

[0010] Furthermore, a bidirectional screw is rotatably connected in the middle of the mounting seat, and a slot is opened in the middle of the mounting seat for the bidirectional screw to be inserted. A servo motor is fixedly provided at one end of the mounting seat, and the output end of the servo motor is fixedly connected to the end of the bidirectional screw through a coupling. The outer surface of the bidirectional screw is symmetrically threaded with two screw slides, and the two screw slides are rotatably connected to the side walls of the slider in turn, and the sliders are all convex in shape and adapted to the internal dimensions of the slide groove in turn, thereby improving the convenience of adjusting the position of the slider.

[0011] Furthermore, a plurality of lenses one are clamped in the middle of the two lens barrels, lenses two are clamped on the inner side walls of the objective lenses, lenses three are clamped on the inner side walls of the eyepieces, and a plano mirror is clamped on the inner side wall of the eyepiece away from the lens barrel, a crosshair is engraved on the surface of the plano mirror, and the lenses one, two, three, three and the plano mirror are located on the same horizontal line.

[0012] Furthermore, a connecting rod is fixedly connected to the middle position of one side wall of the mounting seat near the pointer, the connecting rod is L-shaped, and a cross target is fixedly connected to the top of the connecting rod, the cross target is cross-shaped, and the middle of the cross target is flush with the top of the two pointers in turn, so as to facilitate horizontal correction.

[0013] Furthermore, a second scale panel is fixedly provided on the surface of the first support seat close to the rotating table. The second scale panel is in a circular shape and is adapted to the external dimensions of the first support seat. A second pointer is fixedly provided on the side wall of the rotating table close to the second scale panel. The second pointer and the lens barrel are located in the same vertical direction, thereby improving the rotation accuracy of the rotating table.

[0014] A measuring method for a small aircraft fuselage level measuring device comprises the following steps:

[0015] S1: Spacing adjustment: after the external power supply is connected, the servo motor is started to drive the bidirectional screw to rotate, thereby driving the two screw slides to move toward each other on the outer surface of the bidirectional screw, thereby pushing the two sliders to slide toward each other along the inside of the slide groove, so that the first support seat, the rotating table and the base move synchronously, thereby adjusting the spacing between the two bases;

[0016] S2: Horizontal adjustment. Turn the rotating stage to face the objective lens to the cross target. The height difference between the crosshairs on the surface of the plano mirror and the cross target can be observed through the eyepiece. The operator turns the three outer shells in turn to adjust the height of the outer shell threaded connection on the outer surface of the threaded column, change the overall height of the adjustment base, lens barrel, objective lens and eyepiece, and observe the level bubble. The bubble is centered to ensure that the base is level, so that the line of sight of the two plano mirrors is consistent with the cross target.

[0017] S3: Horizontal measurement. Select two symmetrical points on the fuselage of the small aircraft. The operator first looks into the eyepiece and starts the cylinder to drive the mounting seat to move in the vertical direction so that the crosshairs in the middle of the planoscope coincide with the point. The operator then reads the reading on the surface of the scale panel pointed by the pointer at the corresponding position. The operator then uses another planoscope to read the value in the same way. By comparing the two numerical differences, the horizontal difference between the two points on the fuselage is analyzed.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Firstly, a small aircraft fuselage level measuring device in the present invention is coordinated with a workbench, a gantry, a scale panel, a mounting seat, a cylinder, a lens assembly, a pointer, a slider, a first supporting seat, a rotating table and a threaded column and a connecting assembly, thereby improving the convenience of lens assembly installation positioning and measurement, thereby improving the fuselage measurement efficiency.

[0020] Secondly, a small aircraft fuselage level measuring device in the present invention is provided with a bidirectional screw, a screw slide and a servo motor. When the servo motor is started, two lens assemblies can be driven to move toward each other, thereby enlarging the measurement range and improving the adaptability of the measurement.

[0021] Thirdly, a small aircraft fuselage level measuring device in the present invention is provided with a connecting rod and a cross target. The cross target is in a cross shape and is kept horizontal with two pointers in sequence. The cross target serves as a reference system, which improves the convenience and accuracy of adjusting the height of the lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0023] Figure 2 The present invention Figure 1 Enlarged view at A in the middle;

[0024] Figure 3 is a schematic diagram of a front view of a three-dimensional structure of a connecting assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotating table installation of the present invention;

[0026] Figure 5 It is a schematic diagram of the cross-sectional installation structure of the lens assembly of the present invention;

[0027] Figure 6 It is a side view stereoscopic structural schematic diagram of the present invention;

[0028] Figure 7 It is a schematic diagram of the front view installation stereoscopic structure of the bidirectional screw rod of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the mounting seat of the present invention;

[0030] Fig. 9 It is a schematic diagram of the cross-sectional installation structure of the mounting seat of the present invention.

[0031] The numbers in the figure are: 1. workbench; 2. gantry; 3. scale panel 1; 4. mounting seat; 5. cylinder; 6. lens assembly; 601. base; 602. lens barrel; 603. objective lens; 604. eyepiece; 605. level bubble; 606. groove; 607. lens 1; 608. lens 2; 609. lens 3; 6010. flat mirror; 7. pointer 1; 8. bidirectional screw; 9. slide; 10. slider; 11. first support seat; 12. rotating table; 13. threaded column; 14. connecting assembly; 1401. outer shell; 1402. threaded groove; 1403. ball; 15. screw slide; 16. scale panel 2; 17. pointer 2; 18. slot 1; 19. servo motor; 20. connecting rod; 21. cross target; 22. slot 2. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] refer to Figures 1 to 9A small aircraft fuselage level measuring device shown in the figure includes a workbench 1 and two lens assemblies 6. The workbench 1 is used to place the small aircraft to be tested. A gantry 2 is fixedly connected to the top of the workbench 1. The gantry 2 is used to support the limit. Two scale panels 3 are fixedly arranged on the side walls of the gantry 2 for reading the elevation of the point. A cylinder 5 is fixedly arranged at the middle position of the top of the gantry 2 by bolts. The output end of the cylinder 5 passes through the gantry 2 and is fixedly connected to a mounting seat 4 by a coupling. Starting the cylinder 5 can drive the vertical movement inside the gantry 2, so as to facilitate the adjustment of the height. A pointer 7 is fixedly arranged on the side wall of the mounting seat 4 close to the scale panel 3 to indicate the reading on the surface of the scale panel 3. Two slide grooves are provided on the surface of the mounting seat 4 9, the insides of the two slide grooves 9 are symmetrically slidably connected with sliders 10, the tops of the sliders 10 are fixedly connected with the first support seat 11 to form an integrated structure, the sliders 10 and the first support seat 11 are both made of stainless steel with smooth surfaces, the middle of the first support seat 11 is rotatably connected with a rotating table 12 through a bearing, which improves the convenience of rotating the rotating table 12, the top of the rotating table 12 is fixedly connected with three threaded columns 13 at equal intervals by welding, and the tops of the threaded columns 13 are provided with connecting components 14, and the two lens assemblies 6 include a base 601 for supporting and positioning, and a lens barrel 602 is fixedly provided in the middle of the top of the base 601, one end of the lens barrel 602 is threadedly connected with an objective lens 603 for facing the fuselage, and the other end of the lens barrel 602 The eyepiece 604 is threadedly connected for the operator to observe. A level bubble 605 is fixedly arranged at the top of the base 601 near the lens barrel 602. The level bubble 605 is used to calibrate the level of the base 601. The midlines of the objective lens 603, the lens barrel 602 and the eyepiece 604 are level with the tops of the two pointers 7 in turn. The operator can obtain the heights of two symmetrically distributed points on the fuselage by observing the readings on the two scale panels 3 pointed by the two observation pointers 7 in turn, thereby reducing the time for installing and moving the tripod and improving the efficiency and accuracy of the horizontal measurement of the fuselage points. The connecting components 14 all include an outer shell 1401 threadedly connected to the outer surface of the threaded column 13, and the bottom end of the outer shell 1401 is provided with a threaded groove 140 2. The inner dimensions of the threaded groove 1402 are matched with the outer dimensions of the threaded column 13 in turn. The top of the outer shell 1401 is fixedly connected with the ball 1403 to form an integrated structure. The outer shell 1401 and the ball 1403 are both made of stainless steel and formed by forging. The base 601 is provided with a groove 606 near the bottom of the ball 1403 for the ball 1403 to snap into. The outer dimensions of the ball 1403 are matched with the inner dimensions of the groove 606 in turn, thereby improving the stability of the ball 1403 rotating in the groove 606. The outer shell 1401 can be rotated to adjust the height of the outer shell 1401, thereby changing the height of the base 601. Observing whether the bubble of the level bubble 605 is centered can ensure that the base 601 is level.

[0034] Further, both the workbench 1 and the gantry 2 are made of cast iron. The gantry 2 is in a U shape and is perpendicular to the workbench 1. The two first scale plates 3 are symmetrically distributed and are perpendicular to the workbench 1 and the first pointer 7 in sequence. The bottom end of the first scale plate 3 is flush with the surface of the workbench 1, which is used to improve the measurement accuracy.

[0035] Further, notch 18 is provided on the side wall of the gantry 2 for both ends of the mounting seat 4 to be clamped. The outer dimensions of both ends of the mounting seat 4 are adapted to the inner dimensions of notch 18 in sequence. When the mounting seat 4 slides inside notch 18, the lateral displacement of the mounting seat 4 can be restricted, which improves the stability of the vertical movement of the mounting seat 4.

[0036] Further, a bidirectional lead screw 8 is rotatably connected to the middle of the mounting seat 4. Notch 22 is provided in the middle of the mounting seat 4 for the bidirectional lead screw 8 to be inserted. Both ends of the bidirectional lead screw 8 are connected to the mounting seat 4 through bearings, which can reduce the resistance during rotation and improve the stability of the rotation of the bidirectional lead screw 8. A servo motor 19 is fixedly provided at one end of the mounting seat 4. The output end of the servo motor 19 is fixedly connected to the end of the bidirectional lead screw 8 through a coupling. Two lead screw sliders 15 are symmetrically threadedly connected to the outer surface of the bidirectional lead screw 8. The two lead screw sliders 15 are rotatably connected to the side walls of the sliders 10 in sequence. The sliders 10 are all in a convex shape and are adapted to the inner dimensions of the chute 9 in sequence, which improves the stability of the sliders 10 sliding inside the chute 9. Starting the servo motor 19 can drive the bidirectional lead screw 8, thereby driving the lead screw sliders 15 to move towards each other. The lead screw sliders 15 drive the sliders 10 to move towards each other along the chute 9, which improves the convenience of adjusting the position of the sliders 10.

[0037] Further, a number of first lenses 607 are clamped between the two lens barrels 602. Second lenses 608 are clamped on the inner side walls of the objective lenses 603. Third lenses 609 are clamped on the inner side walls of the eyepieces 604. A plano - convex lens 6010 is clamped on the inner side wall of the eyepiece 604 away from the lens barrel 602. A crosshair is engraved on the surface of the plano - convex lens 6010. The first lenses 607, the second lenses 608, the third lenses 609, and the plano - convex lens 6010 are on the same horizontal line. Rotating the objective lens 603 and the eyepiece 604 in sequence can adjust the focal length between the first lens 607 and the second lens 608 and the third lens 609, thereby facilitating the adjustment of the clarity during observation.

[0038] Further, a connecting rod 20 is fixedly connected to the middle position of the side wall of the mounting seat 4 close to the first pointer 7. The connecting rod 20 is in an L shape. A cross - target 21 is fixedly connected to the top end of the connecting rod 20. The cross - target 21 is in a cross shape. The middle of the cross - target 21 is flush with the top ends of the two first pointers 7 in sequence. The operator rotates the turntable 12 to make the two objective lenses 603 face the cross - target 21, thereby facilitating the calibration of the horizontal height of the two plano - convex lenses 6010.

[0039] Furthermore, a scale panel 16 is fixedly provided on the surface of the first support seat 11 close to the rotating table 12. The scale panel 16 is circular and matched with the external dimensions of the first support seat 11. A pointer 17 is fixedly provided on the side wall of the rotating table 12 close to the scale panel 16. The pointer 17 and the lens barrel 602 are located in the same vertical direction. By observing the pointer 17, it is convenient to read the rotation angle of the rotating table 12, thereby improving the rotation accuracy of the rotating table 12.

[0040] A measuring method for a small aircraft fuselage level measuring device comprises the following steps:

[0041] S1: Spacing adjustment. After the external power supply is connected, the servo motor 19 is started to drive the bidirectional screw 8 to rotate, thereby driving the two screw slides 15 to move toward each other on the outer surface of the bidirectional screw 8, thereby pushing the two sliders 10 to slide toward each other along the inside of the slide groove 9, so that the first support seat 11, the rotating table 12 and the two components 14 and the base 601 move synchronously, thereby adjusting the spacing between the two bases 601, so that the two objective lenses 603 face the symmetrically distributed points on the fuselage to avoid the fuselage blocking the points during measurement, thereby facilitating the measurement of small aircraft fuselages of different sizes and improving the adaptability of horizontal measurement;

[0042] S2: Horizontal adjustment, rotate the rotating table 12 to make the objective lens 603 face the cross target 21, and observe the height difference between the cross hairs on the surface of the plano mirror 6010 and the cross target 21 through the eyepiece 604. The operator rotates the three outer shells 1401 in turn, and the height of the outer shell 1401 threadedly connected to the outer surface of the threaded column 13 can be adjusted, and the overall height of the adjustment base 601, the lens barrel 602, the objective lens 603 and the eyepiece 604 can be changed. Observe that the bubble of the level bubble 605 is centered to ensure that the base 601 is level, so that the line of sight of the two plano mirrors 6010 is consistent with the cross target 21, which improves the convenience of correction.

[0043] S3: Horizontal measurement, two symmetrical points are selected on the fuselage of the small aircraft. The operator first looks into the eyepiece 604, starts the cylinder 5 to drive the mounting seat 4 to move in the vertical direction, so that the crosshairs in the middle of the plano mirror 6010 coincide with the point, keeps the cylinder 5 constant, and then reads the reading on the surface of the scale panel 3 pointed by the pointer 7 at the corresponding position, thereby obtaining the elevation of a point on the fuselage of the small aircraft. In the same way, the operator starts the cylinder 5 to drive the mounting seat 4 to move in the vertical direction, so that the crosshairs in the middle of the other plano mirror 6010 coincide with the other point, and then reads the reading on the surface of the scale panel 3 pointed by the pointer 7 on the other side, thereby obtaining two sets of data. The operator analyzes the horizontal difference between the two points on the fuselage by comparing the two numerical differences. When the spacing adjustment and the horizontal adjustment are completed, the lens assembly 6 can be reused, and the operator does not need to move the tower scale, thereby improving the convenience, efficiency and accuracy of the horizontal measurement of the fuselage.

[0044] Thereby improving the accuracy and convenience of fuselage measurement.

[0045] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A device for measuring the level of a small aircraft fuselage, comprising a workbench (1) and two lens assemblies (6), characterized in that: The top of the workbench (1) is fixedly connected to a gantry (2), two scale panels (3) are fixedly arranged on the side walls of the gantry (2), a cylinder (5) is fixedly arranged at the middle position of the top of the gantry (2), the output end of the cylinder (5) passes through the gantry (2) and is fixedly connected to a mounting seat (4), a pointer (7) is fixedly arranged on the side wall of the mounting seat (4) close to the scale panel (3), two slide grooves (9) are arranged on the surface of the mounting seat (4), the insides of the two slide grooves (9) are symmetrically slidably connected to sliders (10), the tops of the sliders (10) are fixedly connected to a first support seat (11) to form an integrated structure, the middle of the first support seat (11) is rotatably connected to a rotating table (12), the top of the rotating table (12) is evenly and fixedly connected to three threaded columns (13), and the tops of the threaded columns (13) are provided with connecting components (14); The two lens assemblies (6) each comprise a base (601), a lens barrel (602) is fixedly arranged in the middle of the top of each base (601), an objective lens (603) is threadedly connected to one end of each lens barrel (602), an eyepiece (604) is threadedly connected to the other end of each lens barrel (602), a level bubble (605) is fixedly arranged near the top of the lens barrel (602) on the base (601), and the center lines of the objective lens (603), the lens barrel (602) and the eyepiece (604) are respectively level with the tops of the two pointers (7); The connecting components (14) include an outer shell (1401) threadedly connected to the outer surface of a threaded column (13); a thread groove (1402) is provided at the bottom end of the outer shell (1401); the inner dimensions of the thread groove (1402) are matched with the outer dimensions of the threaded column (13); a round ball (1403) is fixedly connected to the top end of the outer shell (1401) to form an integrated structure; a groove (606) is provided at the bottom end of the base (601) near the round ball (1403) for the round ball (1403) to be clamped; the outer dimensions of the round ball (1403) are matched with the inner dimensions of the groove (606).

2. A small aircraft fuselage level measuring device according to claim 1, characterized in that: The workbench (1) and the gantry (2) are both made of cast iron. The gantry (2) is in a convex shape and perpendicular to the workbench (1). The two scale panels (3) are symmetrically distributed and are perpendicular to the workbench (1) and the pointer (7) in sequence.

3. A small aircraft fuselage level measuring device according to claim 2, characterized in that: The side walls of the gantry (2) are each provided with a slot one (18) for the two ends of the mounting seat (4) to be clamped, and the external dimensions of the two ends of the mounting seat (4) are adapted to the internal dimensions of the slot one (18) in sequence.

4. A small aircraft fuselage level measuring device according to claim 3, characterized in that: A bidirectional screw rod (8) is rotatably connected in the middle of the mounting seat (4), and a notch (22) is provided in the middle of the mounting seat (4) for the bidirectional screw rod (8) to be plugged in. A servo motor (19) is fixedly provided at one end of the mounting seat (4), and the output end of the servo motor (19) is fixedly connected to the end of the bidirectional screw rod (8) through a coupling. The outer surface of the bidirectional screw rod (8) is symmetrically threadedly connected with two screw rod slides (15), and the two screw rod slides (15) are rotatably connected to the side wall of the slider (10) in turn, and the sliders (10) are all convex in shape and are adapted to the internal dimensions of the slide groove (9) in turn.

5. A small aircraft fuselage level measuring device according to claim 1, characterized in that: A plurality of lenses one (607) are clamped in the middle of the two lens barrels (602), a lens two (608) is clamped on the inner side wall of the objective lens (603), a lens three (609) is clamped on the inner side wall of the eyepiece (604), a flat mirror (6010) is clamped on the inner side wall of the eyepiece (604) away from the lens barrel (602), a crosshair is printed on the surface of the flat mirror (6010), and the lens one (607), lens two (608), lens three (609), lens three (609) and the flat mirror (6010) are located on the same horizontal line.

6. A small aircraft fuselage level measuring device according to claim 1, characterized in that: A connecting rod (20) is fixedly connected to the mounting seat (4) at a middle position near the side wall of the pointer one (7), the connecting rod (20) is L-shaped, and a cross target (21) is fixedly connected to the top of the connecting rod (20), the cross target (21) is cross-shaped, and the middle of the cross target (21) is flush with the tops of the two pointers one (7) in sequence.

7. A small aircraft fuselage level measuring device according to claim 1, characterized in that: A second scale panel (16) is fixedly provided on the surface of the first support seat (11) close to the rotating platform (12); the second scale panel (16) is in a circular shape and is compatible with the external dimensions of the first support seat (11); a second pointer (17) is fixedly provided on the side wall of the rotating platform (12) close to the second scale panel (16); the second pointer (17) and the lens barrel (602) are located in the same vertical direction.

8. A method for measuring the level of a small aircraft fuselage, using the small aircraft fuselage level measuring device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: spacing adjustment, after connecting to an external power source, the servo motor (19) is started to drive the bidirectional screw (8) to rotate, thereby driving the two screw slides (15) to move toward each other on the outer surface of the bidirectional screw (8), thereby pushing the two sliders (10) to slide toward each other along the inside of the slide groove (9), so that the first support seat (11), the rotating table (12) and the base (601) move synchronously, thereby adjusting the spacing between the two bases (601); S2: Horizontal adjustment, rotating the rotating platform (12) to make the objective lens (603) face the cross target (21), and through the eyepiece (604) the height difference between the crosshairs on the surface of the plano mirror (6010) and the cross target (21) can be observed, and the operator rotates the three outer shells (1401) in sequence to adjust the height of the outer shell (1401) threadedly connected to the outer surface of the threaded column (13), change the overall height of the adjustment base (601), the lens barrel (602), the objective lens (603) and the eyepiece (604), and observe the bubble of the level bubble (605) to ensure that the base (601) is level, so that the sight lines of the two plano mirrors (6010) are consistent with the cross target (21). S3: Horizontal measurement. Two symmetrical points are selected on the fuselage of the small aircraft. The operator first looks into the eyepiece (604) and starts the cylinder (5) to drive the mounting seat (4) to move in the vertical direction so that the crosshairs in the middle of the plano mirror (6010) coincide with the point. The operator then reads the reading on the surface of the scale panel (3) pointed by the pointer (7) at the corresponding position. The operator then uses another plano mirror (6010) to read the value in the same way. The horizontal difference between the two points on the fuselage is analyzed by comparing the two numerical differences.

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