A leveling device and method for the intersection of the nose landing gear installation point on an aircraft.

Abstract

This invention discloses a leveling device and method for the nose landing gear mounting point of an aircraft, including a ball joint assembly, a lift adjustment assembly, a leveling adjustment assembly, and a level feed adjustment assembly. The lift adjustment assembly, the leveling adjustment assembly, and the level feed adjustment assembly are interconnected to form a three-axis fully closed-loop servo CNC attitude adjustment and positioning device with motion adjustment function in three orthogonal directions in space. The ball joint assembly is an end effector installed on the leveling adjustment assembly to receive the ball joint fixedly connected to the nose and form a ball joint kinematic pair. The leveling of the nose landing gear mounting point located below the nose of the aircraft is achieved through the coordinated linkage of the four CNC attitude adjustment and positioning devices.

Description

Technical Field

[0001] This application belongs to the technical field of aircraft large component docking and assembly and landing gear installation, specifically relating to a leveling device and leveling method for the installation intersection of the nose landing gear of an aircraft. Background Technology

[0002] Landing gear is a vulnerable component of an aircraft, bearing enormous impact loads during landing. Modern aircraft typically employ a tricycle landing gear configuration, with the nose landing gear mounted below the nose. This nose landing gear must withstand loads from the fuselage and provide guidance during landing, playing a crucial role in ensuring safe flight. Therefore, the installation of the nose landing gear requires extremely high precision. Misalignment of the nose landing gear mounting point axis will cause misalignment, resulting in eccentric loads during operation and affecting safe landing. To address this, a method and equipment for leveling the nose landing gear mounting point are proposed. Through the coordinated operation of four CNC attitude adjustment and positioning devices, the nose landing gear mounting point is precisely leveled, providing a precise assembly benchmark for the nose landing gear installation. Summary of the Invention

[0003] The purpose of this application is to provide a method and equipment for leveling the installation intersection of the nose landing gear of an aircraft, which is applicable to the precise leveling of the installation intersection of the nose landing gear and similar geometric elements.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A method and equipment for leveling the junction of the nose landing gear installation point of an aircraft includes two large-stroke CNC attitude adjustment and positioning devices, two small-stroke CNC attitude adjustment and positioning devices, and a main control system. The two large-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground in the area on both sides of the rear end frame of the nose at the fuselage docking station. The two small-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground in the area on both sides of the front end frame of the nose at the fuselage docking station. Each large-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lift adjustment component, a horizontal feed adjustment component, a horizontal adjustment component, a ball socket component, and a large-stroke sub-control system. Each small-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lift adjustment component and two sets of horizontal adjustment components. After the aircraft nose section components, ball joint components, and short-stroke sub-control system are hoisted from the off-frame station to the fuselage docking station, two long-stroke CNC attitude adjustment and positioning devices drive all components to move through the long-stroke sub-control system, and finally make the ball joint components at the end fit and lock with the two ball joints on both sides of the rear end frame of the nose. Two short-stroke CNC attitude adjustment and positioning devices drive all components to move through the short-stroke sub-control system, and finally make the ball joint components at the end fit and lock with the two ball joints on both sides of the front end frame of the nose. After forming ball joint kinematic pairs, the two long-stroke CNC attitude adjustment and positioning devices and the two short-stroke CNC attitude adjustment and positioning devices work together through the main control system to level the installation intersection of the nose landing gear of the aircraft.

[0006] The lifting and adjusting assembly includes a column, a slide block, a first guide rail, a first lead screw, a first servo motor, and a first grating ruler. The column has a square hollow structure and is fixedly connected to the ground at the bottom. The slide block is embedded in the column along the vertical direction and connected to the inner wall of the column through the first guide rail and the first lead screw. The reading head of the first grating ruler is fixedly connected to the column, and the ruler body is fixedly connected to the slide block. The first servo motor drives the first lead screw to move the slide block up and down relative to the column along the length of the first guide rail in the vertical plane. The first grating ruler measures the displacement of the slide block in real time and feeds it back to the large stroke control system or the small stroke control system. The top surface of the slide block is equipped with a slide block positioning key.

[0007] The horizontal feed adjustment assembly includes a slanted head cantilever, a base plate, a second guide rail, a second lead screw, a second servo motor, and a second grating ruler. The base plate has a base plate positioning groove on its bottom surface, which is positioned and connected to the top surface of the slide block of the lifting adjustment assembly through a keyway. The slanted head cantilever has a box structure, and its bottom is connected to the base plate through the second guide rail and the second lead screw. The reading head of the second grating ruler is fixedly connected to the base plate, and the ruler body is fixedly connected to the slanted head cantilever. The second servo motor drives the second lead screw to move the slanted head cantilever left and right relative to the base plate in the horizontal plane along the length of the second guide rail. The second grating ruler measures the displacement of the slanted head cantilever in real time and accurately and feeds it back to the large stroke control system. The top surface of the slanted head cantilever has a slanted head cantilever positioning key.

[0008] The horizontal adjustment assembly includes a base, a slide plate, a third guide rail, a third lead screw, a third servo motor, and a third grating ruler. The base has a base positioning groove on its bottom surface and a slide plate positioning key on its top surface. The base is a slotted box structure and is connected to the slide plate via the third guide rail and the third lead screw. The reading head of the third grating ruler is fixedly connected to the slide plate, and the ruler body is fixedly connected to the base. The third servo motor drives the third lead screw, which causes the slide plate to move back and forth relative to the base in the horizontal plane along the length of the third guide rail. The third grating ruler measures the displacement of the slide plate in real time and feeds it back to the large stroke control system or the small stroke control system.

[0009] In a long-stroke CNC posture adjustment and positioning equipment, the base positioning groove and the inclined head cantilever positioning key of the horizontal feed adjustment component are connected by a keyway.

[0010] In the small-stroke CNC posture adjustment and positioning equipment, the base positioning groove and the slide positioning key of the lifting adjustment component are connected by a keyway positioning, and the base positioning groove and the slide positioning key of another set of horizontal adjustment components are connected by a keyway positioning.

[0011] The ball socket assembly includes a ball socket, a base plate, locking tongues, and a force sensor. The bottom surface of the base plate has a base plate positioning groove, which is positioned and connected to the top surface of the sliding plate of the leveling component through a keyway. The upper surface of the base plate is connected to the force sensor, and the ball socket is installed on the force sensor. The diameter of the ball socket is the same as the diameter of the ball head fixedly connected to the machine head, ensuring that the centers of the ball head and the ball socket coincide after they are fitted together. Three locking tongues are evenly distributed radially on the ball socket. The locking tongues are cylindrical structures with their mounting axis parallel to the bottom surface of the ball socket, and slide back and forth on the ball socket along their mounting axis.

[0012] The specific operating procedure for leveling the intersection of the aircraft's nose landing gear installation using this equipment is as follows:

[0013] 1. Install ball joints at the external positions of the head assembly frame. There are four ball joints in total, located on both sides of the front and rear end frames of the head assembly. The area enclosed by the ball joints can contain the center of gravity of the head assembly.

[0014] 2. The head assembly with ball joints is hoisted from the external station to the head area of ​​the fuselage docking station above four CNC attitude adjustment and positioning devices. Among them, two large-stroke CNC attitude adjustment and positioning devices are used to support the ball joints located on both sides of the rear end frame of the head assembly, and two small-stroke CNC attitude adjustment and positioning devices are used to support the ball joints located on both sides of the front end frame of the head assembly.

[0015] 3. Set the locking tongues of the ball socket assemblies of the four CNC attitude adjustment and positioning equipment to the retracted state. The two large-stroke CNC attitude adjustment and positioning equipment drive all components to move through the large-stroke sub-control system and make the ball socket assemblies at the end finally engage with the two ball heads on both sides of the rear end frame of the machine head. The two small-stroke CNC attitude adjustment and positioning equipment drive all components to move through the small-stroke sub-control system and make the ball socket assemblies at the end finally engage with the two ball heads on both sides of the front end frame of the machine head. Continue until the four ball sockets receive the ball heads and the force sensor displays a value of about one-quarter of the total weight of the machine head components. This indicates that the four ball heads have completely fallen into the ball sockets and are in close contact with the ball sockets, and the center of the ball head coincides with the center of the ball socket. At this time, set the locking tongues of the four ball socket assemblies to the extended state and lock the ball heads. This makes the ball heads and ball socket assemblies form a ball joint motion pair, ensuring that the two rotate relative to each other around the center of the ball and do not separate.

[0016] 4. Measure the difference between the axis of the nose landing gear installation intersection and other auxiliary measurement points and their theoretical positions, and feed it back to the main control system to plan the attitude adjustment path of the nose component. Finally, it is converted into the coordinated linkage of each adjustment component of the four attitude adjustment CNC positioning equipment along a certain direction to complete the pitch, roll, yaw and translation operations of the nose component's spatial attitude until the axis of the nose landing gear installation intersection is adjusted to the theoretical position.

[0017] 5. The adjustment components of the four CNC attitude adjustment and positioning equipment remain in their current positions. After the other fuselage components at this station have also completed their spatial attitude adjustment, the four CNC attitude adjustment and positioning equipment will once again drive the nose component to move parallel to the aircraft's heading and move towards the mid-fuselage component to complete the docking of the nose and mid-fuselage and the installation of the nose landing gear.

[0018] The beneficial effects of this application are:

[0019] Four three-axis fully closed-loop servo-controlled attitude adjustment and positioning devices are formed by interconnecting various components with unidirectional motion adjustment functions. Each device has motion adjustment functions in three orthogonal directions in space. Each CNC attitude adjustment and positioning device uses a ball-and-socket assembly as its end effector. After the ball-and-socket assembly is engaged and locked with the ball joints fixed to both sides of the aircraft's front and rear end frames, the main control system drives the four CNC attitude adjustment and positioning devices to coordinate and adjust the spatial attitude of the nose component, including pitch, roll, yaw, and translation. Ultimately, this achieves the leveling of the nose landing gear mounting point. The ball joint kinematic pair formed by the ball joint and the ball socket ensures that they can generate relative rotation around the ball center without disengaging. The entire adjustment process is automatically performed using a fully closed-loop servo control method, which monitors and dynamically adjusts the position of the nose landing gear mounting point in real time, continuously approaching until it reaches the theoretical position. This provides a solution for the automated, efficient, and precise leveling of the aircraft's nose landing gear mounting point, exhibiting high adjustment accuracy and execution efficiency.

[0020] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a method and equipment for leveling the intersection of the nose landing gear installation point on an aircraft.

[0022] Figure 2 This is a schematic diagram of the lifting and adjusting component structure;

[0023] Figure 3 This is a schematic diagram of the horizontal feed adjustment component structure. Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the horizontal feed adjustment component structure. Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the horizontal adjustment component structure;

[0026] Figure 6 This is a schematic diagram of the ball-and-socket assembly structure.

[0027] The numbers in the diagram are explained as follows: 1-Lifting adjustment component, 2-Horizontal feed adjustment component, 3-Horizontal adjustment component, 4-Ball socket component, 5-First servo motor, 6-First lead screw, 7-Slide ram positioning key, 8-Slide ram, 9-First grating ruler, 10-First guide rail, 11-Column, 12-Angled head cantilever, 13-Angled head cantilever positioning key, 14-Second guide rail, 15-Second lead screw, 16-Second servo motor, 17-Second grating ruler, 18-Base plate, 19-Slide plate positioning key, 20-Slide plate, 21-Third guide rail, 22-Base, 23-Third lead screw, 24-Third grating ruler, 25-Third servo motor, 26-Lock tongue, 27-Ball socket, 28-Base plate, 29-Force sensor. Detailed Implementation

[0028] See appendix Figure 1-6A leveling device for the nose landing gear installation point of an aircraft includes two large-stroke CNC attitude adjustment and positioning devices, two small-stroke CNC attitude adjustment and positioning devices, and a main control system. The two large-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground in the area on both sides of the rear end frame of the nose at the fuselage docking station. The two small-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground in the area on both sides of the front end frame of the nose at the fuselage docking station. Each large-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lift adjustment component 1, a horizontal feed adjustment component 2, a horizontal adjustment component 3, a ball socket component 4, and a large-stroke sub-control system. Each small-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lift adjustment component 1 and two sets of horizontal adjustment components. Component 3, ball joint assembly 4, and small stroke sub-control system: After the aircraft nose assembly is hoisted from the off-frame station to the fuselage docking station, two large stroke CNC attitude adjustment and positioning devices drive all components to move through the large stroke sub-control system, and finally make the ball joint assembly 4 at the end fit and lock with the two ball joints on both sides of the rear end frame of the nose. Two small stroke CNC attitude adjustment and positioning devices drive all components to move through the small stroke sub-control system, and finally make the ball joint assembly 4 at the end fit and lock with the two ball joints on both sides of the front end frame of the nose. After forming ball joint kinematic pairs, the two large stroke CNC attitude adjustment and positioning devices and the two small stroke CNC attitude adjustment and positioning devices work together through the main control system to level the installation intersection of the nose landing gear of the aircraft.

[0029] The lifting adjustment assembly 1 includes a column 11, a slide 8, a first guide rail 10, a first lead screw 6, a first servo motor 5, and a first grating ruler 9. The column 11 has a square hollow structure and is fixedly connected to the ground at the bottom. The slide 8 is embedded in the column 11 along the vertical direction and is connected to the inner wall of the column 11 through the first guide rail 10 and the first lead screw 6. The reading head of the first grating ruler 9 is fixedly connected to the column 11, and the ruler body is fixedly connected to the slide 8. The first servo motor 5 drives the first lead screw 6 to move the slide 8 up and down relative to the column 11 along the length of the first guide rail 10 in the vertical plane. The first grating ruler 9 measures the displacement of the slide 8 in real time and feeds it back to the large stroke control system or the small stroke control system. The top surface of the slide 8 is provided with a slide positioning key 7.

[0030] The horizontal feed adjustment assembly 2 includes a slanted head cantilever 12, a base plate 18, a second guide rail 14, a second lead screw 15, a second servo motor 16, and a second grating ruler 17. The base plate 18 has a positioning groove on its bottom surface, which is positioned and connected to the top surface of the slide 8 of the lifting adjustment assembly 1 via a keyway. The slanted head cantilever 12 has a box structure, and its bottom is connected to the base plate 18 via the second guide rail 14 and the second lead screw 15. The reading head of the second grating ruler 17 is fixedly connected to the base plate 18, and the ruler body is fixedly connected to the slanted head cantilever 12. The second servo motor 16 drives the second lead screw 15 to move the slanted head cantilever 12 left and right relative to the base plate 18 in the horizontal plane along the length direction of the second guide rail 14. The second grating ruler 17 measures the displacement of the slanted head cantilever 12 in real time and feeds it back to the large stroke control system. The top surface of the slanted head cantilever 12 is provided with a slanted head cantilever positioning key 13.

[0031] The horizontal adjustment component 3 includes a base 22, a slide plate 20, a third guide rail 21, a third lead screw 23, a third servo motor 25, and a third grating ruler 24. The base 22 has a positioning groove on its bottom surface, and the slide plate 20 has a positioning key 19 on its top surface. The base 22 is a slotted box structure and is connected to the slide plate 20 through the third guide rail 21 and the third lead screw 23. The reading head of the third grating ruler 24 is fixedly connected to the slide plate 20, and the ruler body is fixedly connected to the base 22. The third servo motor 25 drives the third lead screw 23 to move the slide plate 20 back and forth in the horizontal plane relative to the base 22 along the length direction of the third guide rail 21. The third grating ruler 24 measures the displacement of the slide plate 20 in real time and feeds it back to the large stroke control system or the small stroke control system.

[0032] In the long-stroke CNC posture adjustment and positioning equipment, the positioning groove of the base 22 and the slanted head cantilever positioning key 13 of the horizontal feed adjustment component 2 are positioned and connected by a keyway.

[0033] In the small-stroke CNC posture adjustment and positioning equipment, the positioning groove of the base 22 is connected to the slide positioning key 7 of the lifting adjustment component 1 through a keyway positioning connection, and the positioning groove of the base 22 is connected to the slide positioning key 19 of another set of horizontal adjustment components 3 through a keyway positioning connection.

[0034] The ball socket assembly 4 includes a ball socket 27, a base plate 28, locking tongues 26, and a force sensor 29. The bottom surface of the base plate 28 is provided with a positioning groove, which is positioned and connected to the top surface of the slide plate 20 of the horizontal adjustment assembly 3 through a keyway. The upper surface of the base plate 28 is connected to the force sensor 29. The ball socket 27 is installed on the force sensor 29. The diameter of the ball in the ball socket 27 is the same as the diameter of the ball head fixedly connected to the machine head, ensuring that the centers of the ball head and the ball socket 27 coincide after they are fitted together. Three locking tongues 26 are evenly distributed radially on the ball socket 27. The locking tongues 26 are cylindrical structures with their mounting axis parallel to the bottom surface of the ball socket 27, and slide back and forth on the ball socket 27 along their mounting axis.

[0035] The specific operating procedure for leveling the intersection of the aircraft's nose landing gear installation using this equipment is as follows:

[0036] 1. Install ball joints at the external positions of the head assembly frame. There are four ball joints in total, located on both sides of the front and rear end frames of the head assembly. The area enclosed by the ball joints can contain the center of gravity of the head assembly.

[0037] 2. The head assembly with ball joints is hoisted from the external station to the head area of ​​the fuselage docking station above four CNC attitude adjustment and positioning devices. Among them, two large-stroke CNC attitude adjustment and positioning devices are used to support the ball joints located on both sides of the rear end frame of the head assembly, and two small-stroke CNC attitude adjustment and positioning devices are used to support the ball joints located on both sides of the front end frame of the head assembly.

[0038] 3. Set the locking tongue 26 of the ball socket assembly 4 of the four CNC attitude adjustment and positioning equipment to the retracted state. The two large-stroke CNC attitude adjustment and positioning equipment drive all components to move through the large-stroke sub-control system and make the ball socket assembly 4 at the end finally engage with the two ball heads on both sides of the rear end frame of the machine head. The two small-stroke CNC attitude adjustment and positioning equipment drive all components to move through the small-stroke sub-control system and make the ball socket assembly 4 at the end finally engage with the two ball heads on both sides of the front end frame of the machine head. Until the four ball sockets 27 receive the ball heads and the force sensor 29 displays a value of about one-quarter of the total weight of the machine head components, it indicates that the four ball heads have completely fallen into the ball sockets 27 and are in close contact with the ball sockets 27 and the center of the ball head coincides with the center of the ball socket 27. At this time, set the locking tongue 26 of the four ball socket assemblies 4 to the extended state and lock the ball heads, so that the ball heads and the ball socket assembly 4 form a ball joint motion pair, ensuring that the two rotate relative to each other around the center of the ball and do not separate.

[0039] 4. Measure the difference between the axis of the nose landing gear installation intersection and other auxiliary measurement points and their theoretical positions, and feed it back to the main control system to plan the attitude adjustment path of the nose component. Finally, it is converted into the coordinated linkage of each adjustment component of the four attitude adjustment CNC positioning equipment along a certain direction to complete the pitch, roll, yaw and translation operations of the nose component's spatial attitude until the axis of the nose landing gear installation intersection is adjusted to the theoretical position.

[0040] 5. The adjustment components of the four CNC attitude adjustment and positioning equipment remain in their current positions. After the other fuselage components at this station have also completed their spatial attitude adjustment, the four CNC attitude adjustment and positioning equipment will once again drive the nose component to move parallel to the aircraft's heading and move towards the mid-fuselage component to complete the docking of the nose and mid-fuselage and the installation of the nose landing gear.

Claims

1. A leveling device for the intersection point of the nose landing gear of an aircraft, characterized in that... The system includes two large-stroke CNC attitude adjustment and positioning devices, two small-stroke CNC attitude adjustment and positioning devices, and a main control system. The two large-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground on both sides of the rear end frame of the machine head at the docking station. The two small-stroke CNC attitude adjustment and positioning devices are fixed side-by-side on the ground on both sides of the front end frame of the machine head at the docking station. Each large-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lifting adjustment component, a horizontal feed adjustment component, a horizontal adjustment component, a ball socket assembly, and a large-stroke sub-control system. Each small-stroke CNC attitude adjustment and positioning device, from bottom to top, includes a lifting adjustment component, two sets of horizontal adjustment components, a ball socket assembly, and a small-stroke sub-control system. After the aircraft nose section is hoisted from the external mounting position to the fuselage docking position, two large-stroke CNC attitude adjustment and positioning devices drive all components to move through the large-stroke sub-control system, and finally the ball joint assembly at the end engages and locks with the two ball joints on both sides of the rear end frame of the nose. Two small-stroke CNC attitude adjustment and positioning devices drive all components to move through the small-stroke sub-control system, and finally the ball joint assembly at the end engages and locks with the two ball joints on both sides of the front end frame of the nose. After forming ball joint kinematic pairs, the main control system drives the two large-stroke CNC attitude adjustment and positioning devices and the two small-stroke CNC attitude adjustment and positioning devices to work together to level the installation intersection of the nose landing gear of the aircraft.

2. The aircraft nose landing gear mounting intersection leveling equipment according to claim 1, characterized in that... The lifting and adjusting assembly includes a column, a slide block, a first guide rail, a first lead screw, a first servo motor, and a first grating ruler. The column has a square hollow structure and is fixedly connected to the ground at the bottom. The slide block is embedded in the column along the vertical direction and connected to the inner wall of the column through the first guide rail and the first lead screw. The reading head of the first grating ruler is fixedly connected to the column, and the ruler body is fixedly connected to the slide block. The first servo motor drives the first lead screw to move the slide block up and down relative to the column along the length of the first guide rail in the vertical plane. The first grating ruler measures the displacement of the slide block in real time and feeds it back to the large stroke control system or the small stroke control system. The top surface of the slide block is provided with a slide block positioning key.

3. The aircraft nose landing gear mounting intersection leveling equipment according to claim 1, characterized in that... The horizontal feed adjustment assembly includes a slanted head cantilever, a base plate, a second guide rail, a second lead screw, a second servo motor, and a second grating ruler. The base plate has a base plate positioning groove on its bottom surface, which is positioned and connected to the top surface of the slide block of the lifting adjustment assembly through a keyway. The slanted head cantilever has a box structure, and its bottom is connected to the base plate through the second guide rail and the second lead screw. The reading head of the second grating ruler is fixedly connected to the base plate, and the ruler body is fixedly connected to the slanted head cantilever. The second servo motor drives the second lead screw to move the slanted head cantilever left and right relative to the base plate in the horizontal plane along the length direction of the second guide rail. The second grating ruler measures the displacement of the slanted head cantilever in real time and feeds it back to the large stroke control system. The top surface of the slanted head cantilever has a slanted head cantilever positioning key.

4. The aircraft nose landing gear mounting intersection leveling equipment according to claim 1, characterized in that... The horizontal adjustment assembly includes a base, a sliding plate, a third guide rail, a third lead screw, a third servo motor, and a third grating ruler. The base has a base positioning groove on its bottom surface and a sliding plate positioning key on its top surface. The base is a slotted box structure and is connected to the sliding plate via the third guide rail and the third lead screw. The reading head of the third grating ruler is fixedly connected to the sliding plate, and the ruler body is fixedly connected to the base. The third servo motor drives the third lead screw to move the sliding plate back and forth relative to the base in the horizontal plane along the length of the third guide rail. The third grating ruler measures the displacement of the sliding plate in real time and feeds it back to the large stroke control system or the small stroke control system.

5. The aircraft nose landing gear mounting intersection leveling equipment according to claim 4, characterized in that... In a long-stroke CNC posture adjustment and positioning equipment, the base positioning groove and the inclined head cantilever positioning key of the horizontal feed adjustment component are connected by a keyway.

6. The aircraft nose landing gear mounting intersection leveling equipment according to claim 4, characterized in that... In a small-stroke CNC posture adjustment and positioning equipment, the base positioning groove of a horizontal adjustment component is connected to the slide positioning key of the lifting adjustment component through a keyway. Another horizontal adjustment component is superimposed on the first horizontal adjustment component, and its base positioning groove is connected to the slide positioning key of the first horizontal adjustment component through a keyway.

7. The aircraft nose landing gear mounting intersection leveling equipment according to claim 1, characterized in that... The ball socket assembly includes a ball socket, a base plate, locking tongues, and a force sensor. The bottom surface of the base plate is provided with a base plate positioning groove, which is positioned and connected to the sliding plate positioning key of the horizontal adjustment assembly that makes up the large stroke CNC posture adjustment and positioning equipment through a keyway, or to the sliding plate positioning key of the upper horizontal adjustment assembly of the two sets of horizontal adjustment assemblies that make up the small stroke CNC posture adjustment and positioning equipment through a keyway. The upper surface of the base plate is connected to the force sensor, and a ball socket is installed on the force sensor. The diameter of the ball socket is the same as the diameter of the ball head that is fixedly connected to the machine head, ensuring that the centers of the two balls coincide after the ball head and the ball socket are fitted. Three locking tongues are evenly distributed radially on the ball socket. The locking tongues are cylindrical structures with their installation axis parallel to the bottom surface of the ball socket, and slide back and forth on the ball socket along their installation axis.

8. A method for leveling an aircraft nose landing gear mounting intersection leveling device as described in any one of claims 1-7, characterized in that... The specific operating procedure is as follows: 8-1 Install ball joints at the external position of the nose component frame. There are four ball joints in total, located on both sides of the front and rear end frames of the nose component. The area enclosed by the ball joints can contain the center of gravity of the nose component. The 8-2 machine head component with ball joint is hoisted from the external station to the machine head area of ​​the fuselage docking station above four CNC attitude adjustment and positioning equipment. Among them, two large-stroke CNC attitude adjustment and positioning equipment are used to support the ball joints located on both sides of the rear frame of the machine head, and two small-stroke CNC attitude adjustment and positioning equipment are used to support the ball joints located on both sides of the front frame of the machine head. 8-3 Set the locking tongues of the ball socket assemblies of the four CNC attitude adjustment and positioning equipment to the retracted state. The two large-stroke CNC attitude adjustment and positioning equipment drive all components to move through the large-stroke sub-control system and make the ball socket assemblies at the end finally engage with the two ball heads on both sides of the rear end frame of the machine head. The two small-stroke CNC attitude adjustment and positioning equipment drive all components to move through the small-stroke sub-control system and make the ball socket assemblies at the end finally engage with the two ball heads on both sides of the front end frame of the machine head. Until the four ball sockets receive the ball heads and the force sensor displays a value of one-quarter of the total weight of the machine head components, it indicates that the four ball heads have completely fallen into the ball sockets and are in close contact with the ball sockets, and the center of the ball head coincides with the center of the ball socket. At this time, set the locking tongues of the four ball socket assemblies to the extended state and lock the ball heads, so that the ball heads and ball socket assemblies form a ball joint motion pair, ensuring that the two rotate relative to each other around the center of the ball and do not separate. 8-4 The difference between the axis of the nose landing gear installation intersection and other auxiliary measurement points and their theoretical positions is measured and fed back to the main control system for the attitude adjustment path planning of the nose component. Finally, it is converted into the coordinated linkage of each adjustment component of the four attitude adjustment CNC positioning equipment along a certain direction to complete the pitch, roll, yaw and translation operations of the spatial attitude of the nose component until the axis of the nose landing gear installation intersection is adjusted to the theoretical position. 8-5 The adjustment components of the four CNC attitude adjustment and positioning equipment remain in their current positions. After the other fuselage components at this station have also completed their spatial attitude adjustment, the four CNC attitude adjustment and positioning equipment will once again drive the nose component to move parallel to the aircraft's heading and move towards the mid-fuselage component to complete the docking of the nose and mid-fuselage and the installation of the nose landing gear.

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