Coaxiality Detection Device for the Vertical Axis of the Aircraft Cabin Door

Abstract

The present invention discloses a coaxiality detection device for the vertical axis of an aircraft cabin door, which relates to the field of vertical axis detection and solves the problem that the existing coaxiality detection device is difficult to comprehensively detect the vertical axis. It includes a device base and an installation box fixedly installed on the top of the device base. A circular box is rotatably installed inside the installation box. Coaxial detection openings are provided on the outer sides of both the circular box and the installation box. Four displacement sensors that are centrosymmetrically arranged are provided inside the circular box. It further includes a detection mechanism for comprehensively detecting the vertical axis by the four displacement sensors. The detection mechanism is installed inside the installation box. Through the detection mechanism of the present invention, when the four displacement sensors are kept rotating and the vertical axis is synchronously pushed, the coaxiality of the outer side of the vertical axis can be comprehensively detected, thus achieving the effect of comprehensive detection.

Description

Technical Field

[0001] The present invention relates to the field of vertical axis detection, and particularly to a coaxiality detection device for the vertical axis of an aircraft cabin door. Background Art

[0002] Aircraft cabin doors are the doors for personnel, cargo, and equipment to enter and exit the aircraft, including boarding doors, service doors, emergency exit window doors, cargo doors, inspection covers, etc. These cabin doors have different designs and functions, but their common purpose is to ensure the safety and smoothness of flight.

[0003] With the all-round development of the economy and the improvement of people's living quality, the quality of aircraft products has received extensive attention from all sectors of society. The coaxiality control of the cabin door affects the final quality of the aircraft. Based on this, to improve the assembly quality and efficiency of the aircraft, the vertical axis of the aircraft cabin door needs to be detected before assembly. The existing Chinese patent publication: CN108050922A discloses a coaxiality detection device. Although it can position the shaft to be detected through three bearings and make the probe of the dial indicator perform coaxiality detection on the shaft to be detected, the vertical axis of the aircraft cabin door is relatively long. During detection, the vertical axis needs to be displaced. When the bearings are clamped, it is difficult to push the vertical axis, and it will cause wear on the outer side of the vertical axis, easily resulting in incomplete detection. Summary of the Invention

[0004] The purpose of the present invention is to provide a coaxiality detection device for the vertical axis of an aircraft cabin door to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A coaxiality detection device for the vertical axis of an aircraft cabin door, comprising: a device base and an installation box fixedly installed on the top of the device base. A circular box is rotatably installed inside the installation box. Coaxial detection openings are provided on the outer sides of the circular box and the installation box, through which the vertical axis can be inserted into the circular box. Four displacement sensors are symmetrically arranged at the center inside the circular box for coaxiality detection of the vertical axis; further comprising: a detection mechanism for enabling the four displacement sensors to comprehensively detect the vertical axis, the detection mechanism being installed inside the installation box; an adjustment mechanism for synchronously adjusting the four displacement sensors with the vertical axis, the adjustment mechanism being installed inside the circular box; and a shaft pushing mechanism for pushing the vertical axis into the detection opening of the installation box, the shaft pushing mechanism being installed on the top of the device base.

[0007] Preferably, the detection mechanism includes a positioning plate fixedly installed outside the displacement sensor. Both sides of the positioning plate are fixedly connected with mounting seats. The bottom of the mounting seat is of an arc structure. Three equally spaced balls are rotatably installed at the bottom of the mounting seat, facilitating the movement of the vertical shaft along the outer sides of the balls. The mounting seat is located outside the mounting box. One side of the positioning plate close to the inner side of the circular box is fixedly connected with a sleeve box. A positioning box is limitedly slidably installed inside the sleeve box. The positioning box is fixedly installed inside the circular box. One side of the displacement sensor close to the positioning box is fixedly connected with a telescopic rod. One end of the telescopic rod away from the displacement sensor is fixedly installed with a dial indicator for displaying the value detected by the displacement sensor. The dial indicator is fixedly installed outside the circular box. A motor is fixedly installed outside the mounting box. The output end of the motor extends into the interior of the mounting box and is fixedly connected with a first toothed cylinder. Two toothed rings cooperating with the first toothed cylinder are fixedly connected to the outside of the circular box. By driving the first toothed cylinder to rotate by the motor, the first toothed cylinder drives the circular box to rotate through the toothed rings, realizing the comprehensive detection of the vertical shaft by the displacement sensor.

[0008] Preferably, the distance adjustment mechanism includes two rotating rings symmetrically and rotatably installed inside the circular box. A plurality of centrally symmetric support rods are fixedly connected between the two rotating rings. Two symmetrically distributed sliding rods are fixedly connected to the outside of the sleeve box. An arc-shaped groove for the sliding rod to be limitedly slidably installed is formed on the outside of the rotating ring. When the rotating ring rotates, it can drive the sliding rod to move through the arc-shaped groove, so that the sliding rod pulls the sleeve box to move along the outside of the positioning box. An arc-shaped cavity is formed on the outside of the rotating ring on the left side of the circular box. An arc-shaped rack is fixedly connected to the inner wall of the arc-shaped cavity. A gear cooperating with the arc-shaped rack is arranged inside the arc-shaped cavity. Rotating the gear can drive the rotating ring to rotate through the arc-shaped rack. The axis of the gear is fixedly connected with an adjustment bolt extending outside the mounting box for adjusting the gear.

[0009] Preferably, the pushing shaft mechanism includes two support plates symmetrically and fixedly installed on the top of the device base. Two symmetrically distributed guide rods are fixedly connected between the two support plates. The guide rods penetrate through the installation box. On the left side of the installation box, there is a movable plate one slidably installed outside the guide rods. One side of the movable plate one close to the installation box is fixedly connected with a resisting rod. On the right side of the installation box, there is a movable plate two slidably installed outside the guide rods. A threaded cylinder one is fixedly installed on the outside of the movable plate two. On the right side of the movable plate two, there is a handle. A rotating rod is fixedly connected to the outside of the handle. Threads matching the threaded cylinder one are provided on the outside of the rotating rod. Rotating the handle can drive the rotating rod to rotate and move along the inside of the threaded cylinder one. Rubber resisting blocks are installed at one end of the resisting rod away from the movable plate one and one end of the rotating rod away from the handle, so as to clamp the vertical axis to be detected with the two rubber resisting blocks. A screw rod is rotatably installed between the two support plates. The screw rod penetrates through the installation box. A toothed cylinder two matching the toothed ring is fixedly connected to the outside of the screw rod. Threaded cylinders two matching the screw rod are fixedly connected to the outside of both the movable plate one and the movable plate two. When the toothed ring rotates, it can drive the screw rod to rotate through the toothed cylinder two, so that the movable plate one and the movable plate two move synchronously, realizing the pushing of the vertical axis.

[0010] Preferably, a triangular clamping plate is fixedly connected to the top of the mounting seat. A sliding groove for the triangular clamping plate to be limited and slide is provided on the outside of the circular box, improving the stability of the mounting seat.

[0011] Preferably, both ends of the mounting seat are arc-shaped structures, facilitating the alignment of the vertical axis with the four mounting seats.

[0012] Preferably, an observation port is provided on one side of the installation box close to the toothed cylinder one for observing the dial indicator.

[0013] Preferably, a connecting plate slidably penetrating through the installation box is fixedly connected between the movable plate one and the movable plate two, facilitating the synchronous movement of the movable plate one and the movable plate two.

[0014] Preferably, the rubber resisting block is in a conical frustum structure, facilitating the abutment against the inside of the vertical axis.

[0015] Preferably, the two rubber resisting blocks are respectively butted with the resisting rod and the rotating rod through mounting nuts, facilitating the installation and disassembly of the rubber resisting blocks.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In the present invention, through the detection mechanism, the vertical axis can be inserted into the inside of the circular box through the detection opening on the mounting box, so that the four displacement sensors can align with the vertical axis, and the four displacement sensors are kept rotating. When the vertical axis is pushed synchronously, a comprehensive coaxiality detection can be carried out on the outside of the vertical axis, thus achieving the effect of comprehensive detection.

[0018] 2. In the present invention, through the distance adjustment mechanism, the central positions of the four displacement sensors and the circular box can be synchronously moved, which is convenient for positioning with the vertical axis, and the displacement sensors can be adjusted according to the size of the vertical axis, so as to detect vertical axes of more sizes.

[0019] 3. In the present invention, through the shaft pushing mechanism, the vertical axis can be clamped and positioned. When the four displacement sensors rotate, the vertical axis is sent into the circular box, which is convenient for detecting a longer displacement vertical axis, and the vertical axis can move at a constant speed, thus achieving the effect of improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the mounting box and the circular box in the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the gear ring and the first gear cylinder in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the rotating ring and the positioning plate in the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the mounting seat and the ball in the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the arc-shaped rack and the sliding rod in the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the sleeve box and the positioning box in the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the rubber abutting block and the rotating rod in the present invention.

[0028] In the figure: 1. Device base; 2. Installation box; 3. Circular box; 4. Displacement sensor; 5. Positioning plate; 6. Mounting seat; 7. Ball; 8. Sleeve box; 9. Positioning box; 10. Telescopic rod; 11. Micrometer; 12. Motor; 13. First gear cylinder; 14. Tooth ring; 15. Rotating ring; 16. Slide bar; 17. Arc cavity; 18. Arc rack; 19. Gear; 20. Adjusting bolt; 21. Support plate; 22. Guide rod; 23. First movable plate; 24. Bracing rod; 25. Second movable plate; 26. First threaded cylinder; 27. Handle; 28. Rotating rod; 29. Rubber bracing block; 30. Screw; 31. Second gear cylinder; 32. Second threaded cylinder; 33. Triangular clamping plate; 34. Connecting plate; 35. Mounting nut; 36. Support rod. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1: Please refer to Figures 1-8 , the coaxiality detection device for the vertical axis of the aircraft cabin door in the figure includes a device base 1 and an installation box 2 fixedly installed on the top of the device base 1. A circular box 3 is rotatably installed inside the installation box 2. Detection openings coaxial with each other are provided on the outer sides of both the circular box 3 and the installation box 2, through which the vertical axis can be inserted into the circular box 3. Four displacement sensors 4 arranged centrosymmetrically are provided inside the circular box 3 for detecting the coaxiality of the vertical axis; further including: a detection mechanism for enabling the four displacement sensors 4 to comprehensively detect the vertical axis, the detection mechanism is installed inside the installation box 2; an adjustment mechanism for enabling the four displacement sensors 4 to be synchronously adjusted with the vertical axis, the adjustment mechanism is installed inside the circular box 3; a shaft pushing mechanism for pushing the vertical axis into the detection opening of the installation box 2, the shaft pushing mechanism is installed on the top of the device base 1.

[0031] The detection mechanism includes a positioning plate 5 fixedly installed outside the displacement sensor 4. Both sides of the positioning plate 5 are fixedly connected with mounting seats 6. The bottom of the mounting seat 6 is of an arc structure. Three equally spaced balls 7 are rotatably installed at the bottom of the mounting seat 6, facilitating the movement of the vertical shaft along the outside of the balls 7. The mounting seat 6 is located outside the mounting box 2. One side of the positioning plate 5 close to the inside of the circular box 3 is fixedly connected with a sleeve box 8. A positioning box 9 is limitedly slidably installed inside the sleeve box 8. The positioning box 9 is fixedly installed inside the circular box 3. One side of the displacement sensor 4 close to the positioning box 9 is fixedly connected with a telescopic rod 10. The end of the telescopic rod 10 far from the displacement sensor 4 is fixedly installed with a dial indicator 11 for displaying the value detected by the displacement sensor 4. The dial indicator 11 is fixedly installed outside the circular box 3. A motor 12 is fixedly installed outside the mounting box 2. The output end of the motor 12 extends into the interior of the mounting box 2 and is fixedly connected with a first toothed cylinder 13. Two toothed rings 14 that cooperate with the first toothed cylinder 13 are fixedly connected to the outside of the circular box 3. By driving the first toothed cylinder 13 to rotate through the motor 12, the first toothed cylinder 13 drives the circular box 3 to rotate through the toothed rings 14, realizing the comprehensive detection of the vertical shaft by the displacement sensor 4;

[0032] The user inserts the vertical shaft between the four mounting seats 6 on the left side of the circular box 3 and starts the motor 12. The motor 12 can drive the toothed ring 14 to rotate through the first toothed cylinder 13, causing the toothed ring 14 to drive the circular box 3 to rotate along the inside of the mounting box 2. The circular box 3 drives the positioning plate 5 to rotate through the positioning box 9 and the sleeve box 8, making the displacement sensor 4 inside the positioning plate 5 move in a circular motion along the outside of the vertical shaft. And the user synchronously pushes the vertical shaft to make the vertical shaft move along the balls 7 on the mounting seat 6, and the vertical shaft can be aligned with the axis of the detection port of the circular box 3. Thus, the comprehensive detection of the vertical shaft is realized through the four displacement sensors 4.

[0033] The distance adjustment mechanism includes two rotating rings 15 symmetrically and rotatably installed inside the circular box 3. A plurality of centrally symmetric support rods 36 are fixedly connected between the two rotating rings 15. Two symmetrically distributed sliding rods 16 are fixedly connected to the outside of the sleeve box 8. An arc-shaped groove for the sliding rod 16 to be limitedly slidable is provided on the outside of the rotating ring 15. When the rotating ring 15 rotates, it can drive the sliding rod 16 to move through the arc-shaped groove, causing the sliding rod 16 to pull the sleeve box 8 to move along the outside of the positioning box 9. An arc-shaped cavity 17 is provided on the outside of the rotating ring 15 on the left side of the circular box 3. An arc-shaped rack 18 is fixedly connected to the inner wall of the arc-shaped cavity 17. A gear 19 that cooperates with the arc-shaped rack 18 is arranged inside the arc-shaped cavity 17. Rotating the gear 19 can drive the rotating ring 15 to rotate through the arc-shaped rack 18. The axis of the gear 19 is fixedly connected with an adjusting bolt 20 extending outside the mounting box 2 for adjusting the gear 19;

[0034] The user can rotate the adjusting bolt 20 to drive the gear 19 to rotate, so that the gear 19 drives the corresponding rotating ring 15 to rotate through the arc-shaped rack 18. The rotating ring 15 can drive another rotating ring 15 to rotate synchronously through the support rod 36, so that the rotating ring 15 pulls the sliding rod 16 to move through the arc-shaped groove. The sliding rod 16 drives the sleeve box 8 to move along the outside of the positioning box 9. The sleeve box 8 can drive the displacement sensor 4 and the mounting seat 6 to move synchronously through the positioning plate 5, realizing the synchronous adjustment of the four displacement sensors 4. The vertical axis can be centered by the ball 7 on the mounting seat 6, and the corresponding adjustment can be made according to the size of the vertical axis, so as to facilitate the detection of vertical axes of more sizes.

[0035] The pushing shaft mechanism includes two support plates 21 symmetrically and fixedly installed on the top of the device base 1. Two symmetrically distributed guide rods 22 are fixedly connected between the two support plates 21. The guide rods 22 penetrate through the mounting box 2. A movable plate one 23 slidably installed on the outside of the guide rod 22 is arranged on the left side of the mounting box 2. A resisting rod 24 is fixedly connected to the side of the movable plate one 23 close to the mounting box 2. A movable plate two 25 slidably installed on the outside of the guide rod 22 is arranged on the right side of the mounting box 2. A threaded cylinder one 26 is fixedly installed on the outside of the movable plate two 25. A handle 27 is arranged on the right side of the movable plate two 25. A rotating rod 28 is fixedly connected to the outside of the handle 27. Threads matching the threaded cylinder one 26 are provided on the outside of the rotating rod 28. Rotating the handle 27 can drive the rotating rod 28 to rotate and move along the inside of the threaded cylinder one 26. Rubber resisting blocks 29 are installed at one end of the resisting rod 24 away from the movable plate one 23 and one end of the rotating rod 28 away from the handle 27, so that the two rubber resisting blocks 29 clamp the vertical axis to be detected. A screw rod 30 is rotatably installed between the two support plates 21. The screw rod 30 penetrates through the mounting box 2. A tooth cylinder two 31 matching the tooth ring 14 is fixedly connected to the outside of the screw rod 30. Threaded cylinders two 32 matching the screw rod 30 are fixedly connected to the outside of the movable plate one 23 and the movable plate two 25. When the tooth ring 14 rotates, it can drive the screw rod 30 to rotate through the tooth cylinder two 31, so that the movable plate one 23 and the movable plate two 25 move synchronously, realizing the pushing of the vertical axis.

[0036] When the user inserts the vertical shaft between the four mounting seats 6 on the left side of the circular box 3, the rotating rod 28 can be rotated by the handle 27, so that the rotating rod 28 makes a rotational movement along the inner side of the threaded barrel 26. The rubber abutting block 29 on the rotating rod 28 contacts one side of the vertical shaft, and pushes the vertical shaft to contact the rubber abutting block 29 on the abutting rod 24, so as to position and clamp the vertical shaft. When the toothed ring 14 rotates, it can drive the second toothed cylinder 31 to rotate synchronously, so that the second toothed cylinder 31 drives the screw rod 30 to rotate. The screw rod 30 drives the movable plate 23 and the movable plate 25 to move in the same direction along the outer side of the guide rod 22 through the threaded barrel 32, so as to push the vertical shaft into the circular box 3 to detect the vertical shaft, and corresponding adjustment can be made according to the length of the vertical shaft, improving the convenience and efficiency of the vertical shaft detection.

[0037] Working principle: First, the user inserts the vertical shaft between the four mounting seats 6 on the left side of the circular box 3 and rotates the handle 27, so that the handle 27 drives the rotating rod 28 to rotate. The rotating rod 28 makes a rotational movement along the inner side of the threaded barrel 26, so that the rubber abutting block 29 on the rotating rod 28 contacts one side of the vertical shaft, and pushes the vertical shaft to contact the rubber abutting block 29 on the abutting rod 24 to position and clamp the vertical shaft. Subsequently, the user starts the motor 12, and the motor 12 drives the first toothed cylinder 13 to rotate, so that the first toothed cylinder 13 drives the two toothed rings 14 to rotate. The toothed ring 14 drives the second toothed cylinder 31 to rotate synchronously, so that the second toothed cylinder 31 drives the screw rod 30 to rotate. The screw rod 30 drives the movable plate 23 and the movable plate 25 to move in the same direction along the outer side of the guide rod 22 through the threaded barrel 32, so as to drive the vertical shaft to move synchronously. When one end of the vertical shaft is aligned with the ball 7 of the mounting seat 6, the user turns off the motor 12 and rotates the adjusting bolt 20, so that the adjusting bolt 20 drives the gear 19 to rotate. The gear 19 drives the corresponding rotating ring 15 to rotate through the arc-shaped rack 18. The rotating ring 15 drives another rotating ring 15 to rotate synchronously through the support rod 36. The four arc-shaped grooves corresponding to the two rotating rings 15 pull the sliding rod 16 to move, and the sliding rod 16 drives the sleeve box 8 to move along the outer side of the positioning box 9. The sleeve box 8 drives the displacement sensor 4 and the mounting seat 6 to move synchronously through the positioning plate 5, so that the ball 7 on the mounting seat 6 contacts the outer side of the vertical shaft to perform axial center positioning on the bearing. Finally, the user starts the motor 12 again, and the rubber abutting block 29 pushes the vertical shaft to move along the outer side of the ball 7 to the inside of the circular box 3. At the same time, the two toothed rings 14 drive the circular box 3 to rotate along the inside of the mounting box 2. The circular box 3 drives the positioning plate 5 to rotate through the positioning box 9 and the sleeve box 8, so that the displacement sensor 4 inside the positioning plate 5 makes a circular motion along the outer side of the vertical shaft. Thus, as the vertical shaft moves at a constant speed, the four displacement sensors 4 in the rotating state can perform coaxiality detection on the vertical shaft, thereby achieving the effect of quickly and comprehensively detecting the vertical shaft and improving the detection efficiency and convenience.

[0038] Embodiment 2: Please refer to Figure 3 andFigure 5 This embodiment further elaborates on the first embodiment. At the top of the mounting base 6 shown in the figure, a triangular clamping plate 33 is fixedly connected. A sliding groove for the triangular clamping plate 33 to be limited and slide is provided on the outer side of the circular box 3, which improves the stability of the mounting base 6. Both ends of the mounting base 6 are arc-shaped structures, facilitating the alignment of the vertical axis with the four mounting bases 6. An observation port is provided on one side of the mounting box 2 close to the first gear cylinder 13 for observing the dial indicator 11.

[0039] In this embodiment: When the positioning plate 5 moves, it can drive the mounting base 6 and the triangular clamping plate 33 to move along the sliding groove on the circular box 3, so that the triangular clamping plate 33 abuts against the circular box 3 to provide support for the mounting base 6. When the vertical axis moves towards the detection opening of the circular box 3, it can move along the arc edge outside the mounting base 6 to the center position of the detection opening, facilitating the quick alignment of the vertical axis with the four mounting bases 6. After the vertical axis is detected, the user can view the data on the dial indicator 11 through the observation port on the outer side of the mounting box 2.

[0040] Embodiment Three: Please refer to Figure 2 and Figure 8 This embodiment further elaborates on other embodiments. A connecting plate 34 that slidably penetrates the mounting box 2 is fixedly connected between the first movable plate 23 and the second movable plate 25 shown in the figure, facilitating the synchronous movement of the first movable plate 23 and the second movable plate 25. The rubber abutting block 29 has a conical frustum structure, facilitating abutting against the inner side of the vertical axis. The two rubber abutting blocks 29 are respectively docked with the abutting rod 24 and the rotating rod 28 through the mounting nuts 35, facilitating the installation and disassembly of the rubber abutting blocks 29.

[0041] In this embodiment: When the first movable plate 23 and the second movable plate 25 move, they can drive the connecting plate 34 to move synchronously, improving the stability of the movement of the first movable plate 23 and the second movable plate 25 and keeping them moving synchronously. The rubber abutting block 29 can abut against the outer side of the vertical axis with its outer conical surface, facilitating the quick positioning of the vertical axis. And the user can rotate the mounting nut 35 to disassemble the rubber abutting block 29, facilitating the replacement of the corresponding rubber abutting block 29 according to the size of the vertical axis.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Coaxiality detection device for the vertical axis of an aircraft cabin door, characterized in that Including: A device base and a mounting box fixedly installed on the top of the device base. A circular box is rotatably installed inside the mounting box. Detection openings coaxial with each other are provided on the outer sides of both the circular box and the mounting box. Four displacement sensors symmetrically arranged around the center are provided inside the circular box. It further includes: A detection mechanism for enabling the four displacement sensors to comprehensively detect the vertical axis. The detection mechanism is installed inside the mounting box. The detection mechanism includes a positioning plate fixedly installed outside the displacement sensor. Mounting seats are fixedly connected to both sides of the positioning plate. The bottom of the mounting seat is of an arc-shaped structure. Three equally spaced balls are rotatably installed at the bottom of the mounting seat. The mounting seat is located outside the mounting box. A sleeve box is fixedly connected to the side of the positioning plate close to the inside of the circular box. A positioning box is slidably limited inside the sleeve box. The positioning box is fixedly installed inside the circular box. A telescopic rod is fixedly connected to the side of the displacement sensor close to the positioning box. A dial indicator is fixedly installed at the end of the telescopic rod away from the displacement sensor. The dial indicator is fixedly installed outside the circular box. A motor is fixedly installed outside the mounting box. The output end of the motor extends into the inside of the mounting box and is fixedly connected to a first toothed cylinder. Two toothed rings cooperating with the first toothed cylinder are fixedly connected to the outside of the circular box. A distance adjustment mechanism for enabling the four displacement sensors to be synchronously adjusted with the vertical axis. The distance adjustment mechanism is installed inside the circular box. The distance adjustment mechanism includes two symmetrically rotatably installed rotating rings inside the circular box. A plurality of centrally symmetric support rods are fixedly connected between the two rotating rings. Two symmetrically distributed sliding rods are fixedly connected to the outside of the sleeve box. Arc-shaped grooves for limiting the sliding of the sliding rods are provided on the outside of the rotating rings. An arc-shaped cavity is provided on the outside of the rotating ring on the left side of the circular box. An arc-shaped rack is fixedly connected to the inner wall of the arc-shaped cavity. A gear cooperating with the arc-shaped rack is provided inside the arc-shaped cavity. The axis of the gear is fixedly connected to an adjustment bolt extending outside the mounting box. A push shaft mechanism for pushing the vertical axis into the detection opening of the mounting box. The push shaft mechanism is installed on the top of the device base. The push shaft mechanism includes two symmetrically fixedly installed support plates on the top of the device base. Two symmetrically distributed guide rods are fixedly connected between the two support plates. The guide rods penetrate through the mounting box. A first movable plate slidably installed outside the guide rods is provided on the left side of the mounting box. A resisting rod is fixedly connected to the side of the first movable plate close to the mounting box. A second movable plate slidably installed outside the guide rods is provided on the right side of the mounting box. A first threaded cylinder is fixedly installed on the outside of the second movable plate. A handle is provided on the right side of the second movable plate. A rotating rod is fixedly connected to the outside of the handle. Threads cooperating with the first threaded cylinder are provided on the outside of the rotating rod. Rubber resisting blocks are installed at the ends of the resisting rod away from the first movable plate and the rotating rod away from the handle respectively. A screw rod is rotatably installed between the two support plates. The screw rod penetrates through the mounting box. A second toothed cylinder cooperating with the toothed ring is fixedly connected to the outside of the screw rod. Threaded cylinders cooperating with the screw rod are fixedly connected to the outside of both the first movable plate and the second movable plate.

2. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, wherein: A triangular clamping plate is fixedly connected to the top of the mounting seat. A sliding groove for limiting the sliding of the triangular clamping plate is provided on the outside of the circular box.

3. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, characterized in that: Both ends of the mounting seat are of a circular arc-shaped structure.

4. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, characterized in that: An observation port is provided on one side of the installation box close to the first gear cylinder.

5. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, characterized in that: A connecting plate that slidably penetrates the installation box is fixedly connected between the first movable plate and the second movable plate.

6. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, wherein: The rubber abutting block has a conical frustum structure.

7. The coaxiality detection device for the vertical axis of the aircraft cabin door according to claim 1, characterized in that: The two rubber abutting blocks are respectively butted against the abutting rod and the rotating rod through mounting nuts.

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