Undercarriage dismounting device with multi-degree-of-freedom adjustment

Abstract

The utility model discloses a multi-degree-of-freedom adjustable undercarriage disassembling and assembling device which comprises a movable base, a lifting mechanism, a fine adjustment mechanism, a support adjusting mechanism, a control cabinet and four axle supports. According to the multi-degree-of-freedom adjustment undercarriage dismounting and mounting device, horizontal movement is achieved through the movable base, lifting movement is achieved through the lifting mechanism, angle adjustment is achieved through the fine adjustment mechanism, and therefore three-dimensional movement of an undercarriage in the mounting process and accurate alignment with a standard mounting angle are achieved, and the problem that manual angle adjustment is difficult is solved; the disassembly and assembly processes of the undercarriage are more efficient and convenient; the support adjusting mechanism is used for adjusting the distance between the four axle supports, so that the four axle supports can be suitable for most undercarriages of common models, and the operation cost of airlines and maintenance factories is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a disassembly and assembly device, and more particularly to a landing gear disassembly and assembly device with multiple degrees of freedom adjustment. Background Technology

[0002] With the rapid development of the modern aviation industry, civil aircraft manufacturers have developed various models of aircraft to meet diverse needs. Landing gear, as one of the key components of an aircraft, is crucial to flight safety and reliability. According to the Civil Aviation Administration of China's airworthiness regulations and the design, maintenance, and usage requirements of aircraft manufacturers, commercial passenger aircraft must undergo inspection and necessary replacement after completing a certain number of flight cycles (i.e., takeoffs and landings) or during scheduled overhauls.

[0003] To ensure the safety performance of different aircraft models, aircraft manufacturers have designed landing gear of various sizes to accommodate the different load-bearing requirements of each aircraft. Landing gear types can be distinguished by the number of tires, such as single-row, double-row, or triple-row main landing gear. For example, the Airbus A320 and Boeing B737 use single-row main landing gear, while the Airbus A330 and Boeing B767 use double-row landing gear, and the Boeing B777 is equipped with triple-row landing gear.

[0004] Given the diversity of landing gear, the weight, height requirements, and tilt angles needed for disassembly and installation vary depending on the aircraft type. Each aircraft type has its own specific installation and disassembly procedures. These procedures require specialized tooling to accommodate the needs of different models. In the context of economic downturn, this specialized tooling imposes a heavy cost burden on airlines and maintenance manufacturers. Furthermore, during installation or disassembly, lifting equipment is needed to raise the landing gear to the appropriate position, and manual adjustment of the installation angle is required. The entire disassembly and installation process is complex and tedious, with manual adjustments being particularly difficult. Utility Model Content

[0005] Purpose of the utility model: To provide a landing gear disassembly and assembly device with multiple degrees of freedom adjustment, which can adapt to the disassembly and assembly of landing gear for various mainstream aircraft.

[0006] Technical Solution: The multi-degree-of-freedom adjustable landing gear assembly and disassembly device provided by this utility model includes a movable base, a lifting mechanism, a fine-tuning mechanism, a bracket adjustment mechanism, a control cabinet, and four wheel axle brackets; the lifting mechanism is mounted on the movable base; the fine-tuning mechanism is mounted on the lifting mechanism and is driven by the lifting mechanism to move up and down; the bracket adjustment mechanism is mounted on the fine-tuning mechanism and is used to adjust the tilt angle of the bracket adjustment mechanism; all four wheel axle brackets are mounted on the bracket adjustment mechanism for positioning the landing gear wheel axles, and the bracket adjustment mechanism adjusts the spacing between the four wheel axle brackets; a controller and a memory electrically connected to the controller are provided in the control cabinet; a display screen and a button panel electrically connected to the controller are installed on the control cabinet.

[0007] Furthermore, the movable base includes a base plate, a pull rod, and two side plates; the two side plates are respectively fixed to two opposite sides of the base plate; two casters are installed at the bottom of each side plate; a handle is installed at one end of the pull rod, and the other end is installed on a side plate via a universal joint; positioning branches for positioning support are installed on both side plates.

[0008] Furthermore, the positioning branch includes a positioning telescopic tube, a positioning telescopic rod, and a positioning drive motor; the positioning telescopic tube is fixed to the side plate; the positioning telescopic rod is telescopically installed on the lower end of the positioning telescopic tube; a positioning support plate is rotatably installed on the lower end of the positioning telescopic tube; the positioning drive motor drives the positioning telescopic rod to extend and retract through the positioning support screw, and is electrically connected to the controller through the positioning drive circuit.

[0009] Furthermore, the lifting mechanism includes a lifting frame, a lifting drive motor, and a screw lifting platform; the screw lifting platform is mounted on a movable base; the output shaft of the lifting drive motor is connected to the input end of the screw lifting platform and is electrically connected to the controller through a lifting drive circuit; the lifting frame is mounted on the screw lifting platform, and a fine-tuning mechanism is mounted on the lifting frame, which is driven to lift the lifting frame by the screw lifting platform.

[0010] Furthermore, the fine-tuning mechanism includes a fine-tuning frame and two manual screw jacks; one longitudinal edge of the fine-tuning frame is oscillatingly mounted on the lifting frame, and two fine-tuning seats are laterally slidingly mounted on the lower side of the opposite side of the fine-tuning frame; both manual screw jacks are mounted on the lifting frame, and their input shafts are connected to each other via a third transmission shaft; a wheel is mounted on the input shaft of one of the manual screw jacks; the upper ends of the lifting screws of the two manual screw jacks are respectively hinged to the lower side of the two fine-tuning seats.

[0011] Furthermore, the bracket adjustment mechanism includes a lateral adjustment unit and two longitudinal adjustment units; the lateral adjustment unit includes a lateral drive motor, a lateral drive screw, and two lateral moving seats; the two lateral moving seats are laterally slidably mounted on the fine-tuning mechanism; the lateral drive motor drives the two lateral moving seats to move closer or further apart relative to each other through the lateral drive screw, and is electrically connected to the controller through the lateral drive circuit; the two longitudinal adjustment units are respectively mounted on the two lateral moving seats; the four wheel axle brackets are mounted in pairs on the two longitudinal adjustment units, and the longitudinal adjustment units adjust the longitudinal distance between the two wheel axle brackets in the same group.

[0012] Furthermore, the longitudinal adjustment unit includes a longitudinal drive motor, a longitudinal drive screw, and two longitudinal moving seats; both longitudinal moving seats are longitudinally slidably mounted on the transverse moving seat; the longitudinal drive motor drives the two longitudinal moving seats to move closer or further apart relative to each other through the longitudinal drive screw, and is electrically connected to the controller through the longitudinal drive circuit; the wheel axle bracket is mounted on the longitudinal moving seat.

[0013] Furthermore, the wheel axle bracket includes a mounting plate, two outer half-rings, and two inner half-rings; the two inner half-rings are detachably mounted inside the two outer half-rings respectively; the mounting plate is mounted on the bracket adjustment mechanism; the lower outer half-ring is fixed to the mounting plate; the upper outer half-ring is hinged to the lower outer half-ring via a hinge plate; a locking screw is oscillatingly mounted on the lower outer half-ring; a locking seat for engaging the locking screw is provided on the upper outer half-ring; a hand-tightening nut for pressing tightly against the locking seat is threaded onto the locking screw.

[0014] Compared with existing technologies, the advantages of this invention are as follows: It utilizes a movable base to achieve horizontal movement, a lifting mechanism to achieve vertical movement, and a fine-tuning mechanism to achieve angle adjustment, thereby realizing three-dimensional movement of the landing gear during installation and precise alignment with the standard installation angle. This solves the problem of difficulty in manually adjusting angles, making the disassembly and installation of the landing gear more efficient and convenient. The bracket adjustment mechanism allows for adjustment of the spacing between the four wheel axle brackets, making them suitable for most common landing gear models, significantly reducing operating costs for airlines and maintenance manufacturers. The memory stores data on common landing gear models, specifically the positions of the four wheel axle brackets corresponding to each landing gear model. After selecting a landing gear model via the button panel and display screen, the controller adjusts the spacing between the four wheel axle brackets to ensure their positions correspond to the wheel axle positions of that landing gear model. The button panel allows operators to easily control the movable base, lifting mechanism, and bracket adjustment mechanism via the controller. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention;

[0016] Figure 2 This is a bottom view of the lifting mechanism of this utility model;

[0017] Figure 3 This is a partial enlarged view of the bracket adjustment mechanism of this utility model;

[0018] Figure 4 This is an enlarged view of the wheel and axle bracket of this utility model;

[0019] Figure 5 This is an assembly drawing of the outer half-ring and the inner half-ring of this utility model;

[0020] Figure 6 This is a schematic diagram of the circuit structure of this utility model;

[0021] In the diagram: 1. Control cabinet; 2. Button panel; 3. Base plate; 4. Side plate; 5. Casters; 6. Positioning telescopic tube; 7. Positioning telescopic rod; 8. Positioning support plate; 9. Positioning drive motor; 10. Lifting frame; 12. Second diagonal brace; 13. First diagonal brace; 14. Reinforcing rod; 15. Screw jack; 16. Bevel gear steering gear; 17. First drive shaft; 18. Screw mounting base; 19. Second drive shaft; 20. Lifting drive motor; 21. Lifting mounting base; 22. Manual screw jack; 23. 25. Fine-tuning seat; 26. Rotating wheel; 27. Rotating handle; 28. Fine-tuning frame; 29. ​​Lateral guide rail; 30. Lateral drive motor; 31. Lateral drive screw; 32. Lateral moving seat; 33. Longitudinal drive motor; 34. Longitudinal moving seat; 35. Longitudinal guide rail; 36. Longitudinal drive screw; 37. Outer half ring; 38. Inner half ring; 39. Semi-circular buckle strip; 40. Hinge plate; 41. Hand-tightening nut; 42. Locking screw; 43. Locking seat; 44. Mounting plate; 45. Universal joint; 46. Pull rod; 47. Handle. Detailed Implementation

[0022] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] In the description of this utility model, it should be understood that the terms "left", "right", "front", "back", "up", "down", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Example 1:

[0026] like Figure 1-6 As shown, the multi-degree-of-freedom adjustable landing gear assembly and disassembly device provided by this utility model includes: a movable base, a lifting mechanism, a fine-tuning mechanism, a bracket adjustment mechanism, a control cabinet 1, and four wheel axle brackets;

[0027] The mobile base is used for walking on the ground; the lifting mechanism is installed on the mobile base; the fine-tuning mechanism is installed on the lifting mechanism, which drives the fine-tuning mechanism to move up and down; the bracket adjustment mechanism is installed on the fine-tuning mechanism, which adjusts the tilt angle of the bracket adjustment mechanism; four wheel axle brackets are all installed on the bracket adjustment mechanism to position the wheel axles of the landing gear, and the bracket adjustment mechanism adjusts the distance between the four wheel axle brackets; the control cabinet 1 is installed on the mobile base; the control cabinet 1 contains a controller and a memory electrically connected to the controller; the top surface of the control cabinet 1 is set as a slope for easy observation; a display screen and a button panel 2 electrically connected to the controller are installed on the slope.

[0028] By utilizing a movable base for horizontal movement, a lifting mechanism for vertical movement, and a fine-tuning mechanism for angle adjustment, the system achieves three-dimensional movement and precise alignment with the standard installation angle during landing gear installation. This solves the problem of difficult manual angle adjustment, making the disassembly and installation of landing gear more efficient and convenient. The bracket adjustment mechanism allows for adjustment of the spacing between the four wheel axle brackets, making them compatible with most common landing gear models, significantly reducing operating costs for airlines and maintenance companies. A memory module stores data on common landing gear models, including the positions of the four wheel axle brackets corresponding to each model. After selecting a landing gear model via the button panel 2 and display screen, the controller adjusts the spacing between the four wheel axle brackets to match the wheel axle positions of that landing gear model. The button panel 2 allows operators to easily control the movable base, lifting mechanism, and bracket adjustment mechanism via the controller.

[0029] Furthermore, the movable base includes a base plate 3, a pull rod 46, and two side plates 4; the two side plates 4 are respectively fixed on the left and right sides of the base plate 3; the control cabinet 1 is installed on one side plate 4; a handle 47 is installed on one end of the pull rod 46, and the other end is installed on the other side plate 4 via a universal joint 45; universal wheels 5 are installed on the front and rear sides of the lower side of the two side plates 4; positioning branches for positioning and supporting on the ground are installed on the front and rear edges of the two side plates 4.

[0030] The pull rod 46, handle 47 and universal joint 45 can be used to pull and traction the mobile base; the universal wheel 5 provides the mobile base with the means to move; the positioning branch is used to achieve the effect of positioning support.

[0031] Furthermore, the positioning branch includes a positioning telescopic tube 6, a positioning telescopic rod 7, and a positioning drive motor 9; the positioning telescopic tube 6 is vertically fixed on the side plate 4; the upper end of the positioning telescopic rod 7 is inserted into the lower end of the positioning telescopic tube 6; a positioning support plate 8 is rotatably installed on the lower end of the positioning telescopic tube 6; an anti-slip pad is provided on the lower side of the positioning support plate 8; a positioning support screw for driving the extension and retraction of the positioning telescopic rod 7 is rotatably installed inside the positioning telescopic tube 6; the positioning drive motor 9 is used to drive the positioning support screw to rotate and is electrically connected to the controller through a positioning drive circuit.

[0032] Four positioning drive motors 9 operate synchronously under the control of the controller, driving the corresponding positioning support screws to rotate, which in turn moves the positioning telescopic rod 7 up and down along the positioning telescopic tube 6, causing the anti-slip pad on the lower side of the positioning support plate 8 to leave the ground or press firmly onto the ground, thus achieving positioning support.

[0033] Furthermore, the lifting mechanism includes a lifting frame 10, a lifting drive motor 20, and a screw lifting platform; the screw lifting platform includes three bevel gear steering gears 16 and four screw jacks 15; lifting mounting seats 21 are fixed on the left and right ends of the front and rear edges of the lifting frame 10; the four screw jacks 15 are respectively installed on the lower side of the four lifting mounting seats 21; first diagonal braces 13 are fixed at the four top corners of the base plate 3; screw mounting seats 18 are horizontally fixed on the upper end of the first diagonal braces 13; the lower ends of the lifting screws of the four screw jacks 15 are respectively fixed on the base plate 3, and the upper ends are respectively fixed on the four screw mounting seats 18; second diagonal braces 12 with their lower ends fixed on the corresponding side plates 4 are fixed on the screw mounting seats 18; a reinforcing rod 14 is connected and fixed between the middle of the second diagonal brace 12 and the corresponding first diagonal brace 13.

[0034] The bevel gear steering gear 16 is installed at the center of the lower side of the lifting frame 10, and the other two bevel gear steering gears 16 are installed at the center of the left and right sides of the lower side of the lifting frame 10, respectively. The output shaft of the bevel gear steering gear 16 located at the center of the lower side of the lifting frame 10 is connected to the input shaft of the other two bevel gear steering gears 16 through the first drive shaft 17. The output shaft of the bevel gear steering gear 16 located on the left side of the lower side of the lifting frame 10 is connected to the input shaft of the two screw jacks 15 on the left side through the second drive shaft 19, and the output shaft of the bevel gear steering gear 16 located on the right side of the lower side of the lifting frame 10 is connected to the input shaft of the two screw jacks 15 on the right side through the second drive shaft 19. The output shaft of the lifting drive motor 20 is connected to the input shaft of the bevel gear steering gear 16 located at the center of the lower side of the lifting frame 10, and is electrically connected to the controller through the lifting drive circuit.

[0035] The lifting drive motor 20 operates under the control of the controller, causing the input shaft of the central bevel gear steering gear 16 to drive the output shaft to rotate. The two first transmission shafts 17 drive the input shafts of the other two bevel gear steering gears 16 to rotate synchronously. The output shafts of the two bevel gear steering gears 16 drive the input shafts of the four screw jacks 15 to rotate synchronously through the four second transmission shafts 19. This enables the four screw jacks 15 to drive the four apex corners of the lifting frame 10 to lift synchronously, thus realizing the lifting drive and ensuring the stability of the lifting. A telescopic dustproof cover is fitted on the lifting screw of the screw jack 15 for dust and ash prevention.

[0036] Furthermore, the fine-tuning mechanism includes a fine-tuning frame 27 and two manual screw jacks 22; the right edge of the fine-tuning frame 27 is oscillatingly mounted on the right edge of the lifting frame 10; both manual screw jacks 22 are mounted on the left side of the upper side of the lifting frame 10; the input shafts of the two manual screw jacks 22 are connected to each other via a third transmission shaft, and a wheel 25 is mounted on the input shaft of one of the manual screw jacks 22; a rotating handle 26 is mounted on the wheel 25; a fine-tuning latch slot is laterally provided on the left side of the lower side of the fine-tuning frame 27; a fine-tuning seat 23 is laterally slidably latched onto both fine-tuning latch slots; the upper ends of the lifting screws of the two manual screw jacks 22 are respectively hinged to the lower sides of the two fine-tuning seats 23.

[0037] Depending on the installation requirements, by rotating the handle 26 and turning the wheel 25, the input shaft of the manual screw jack 22 drives the lifting screw of the manual screw jack 22 to move up and down. At the same time, the fine-tuning seat 23 slides slightly laterally along the fine-tuning buckle groove, allowing the fine-tuning frame 27 to tilt at a certain angle, so that the landing gear can accurately match the installation angle during the installation process.

[0038] Furthermore, the bracket adjustment mechanism includes a lateral adjustment unit and two longitudinal adjustment units; the lateral adjustment unit includes a lateral drive motor 29, a lateral drive screw 30, and two lateral moving seats 31; transverse guide rails 28 are laterally installed on both the front and rear sides of the fine-tuning frame 27; the two lateral moving seats 31 are laterally slidably installed on the two transverse guide rails 28; the two longitudinal adjustment units are respectively installed on the two lateral moving seats 31; the four wheel axle brackets are installed in pairs on the two longitudinal adjustment units, and the longitudinal spacing between the two wheel axle brackets in the same group is adjusted by the longitudinal adjustment units; the thread pitch of the left and right sides of the lateral drive screw 30 is the same but the direction of rotation is opposite; the lateral drive screw 30 is rotatably installed laterally on the fine-tuning frame 27, and the left and right sides are threadedly connected to the two lateral moving seats 31; the lateral drive motor 29 is used to drive the lateral drive screw 30 to rotate, and is electrically connected to the controller through the lateral drive circuit.

[0039] The transverse drive motor 29, under the control of the controller, drives the transverse drive screw 30 to rotate, thereby causing the two transverse moving seats 31 to move laterally, moving closer or further apart, thus realizing the adjustment of the transverse spacing of the left and right wheel axle brackets.

[0040] Furthermore, the longitudinal adjustment unit includes a longitudinal drive motor 32, a longitudinal drive screw 36, and two longitudinal moving seats 33; a longitudinal guide rail 35 is longitudinally mounted on the upper side of the transverse moving seat 31; both longitudinal moving seats 33 are longitudinally slidably mounted on the longitudinal guide rail 35; a wheel axle bracket is mounted on the upper side of the longitudinal moving seat 33; the thread pitch of the longitudinal drive screw 36 is the same on both the front and rear sides but opposite in direction; the longitudinal drive screw 36 is rotatably mounted longitudinally on the upper side of the transverse moving seat 31, and its front and rear sides are threaded through the two longitudinal moving seats 33 respectively; the longitudinal drive motor 32 is used to drive the longitudinal drive screw 36 to rotate, and is electrically connected to the controller through the longitudinal drive circuit.

[0041] The longitudinal drive motor 32 drives the longitudinal drive screw 36 to rotate under the control of the controller, thereby driving the two longitudinal moving seats 33 to move longitudinally, moving closer or further apart, thus realizing the adjustment of the longitudinal distance between the front and rear wheel axle supports.

[0042] Furthermore, the wheel axle bracket includes a mounting plate 44, two outer semi-rings 37, and two inner semi-rings 38; the mounting plate 44 is mounted on the upper side of the longitudinal moving seat 33; a semi-annular snap-fit ​​groove is coaxially provided on the inner circumferential surface of the outer semi-rings 37; a semi-annular snap-fit ​​strip 39 for sliding snap-fit ​​on the semi-annular snap-fit ​​groove is coaxially provided on the outer circumferential surface of the inner semi-rings 38;

[0043] The outer circumferential surface of the lower outer half-ring 37 is fixed to the upper side of the mounting plate 44, and a hinge seat is provided at both ends; a hinge seat and a locking seat 43 are respectively provided at both ends of the upper outer half-ring 37; the hinge seat of the upper outer half-ring 37 is hinged to one of the hinge seats of the lower outer half-ring 37 through a hinge piece 40; a locking screw 42 is oscillatingly installed on the other hinge seat of the lower outer half-ring; a locking slot for locking the locking screw 42 is provided on the locking seat 43; a hand-tightening nut 41 with its lower side for pressing against the upper side of the locking seat 43 is threaded onto the locking screw 42.

[0044] The locking screw 42, the hand-tightening nut 41, and the locking seat 43 work together to lock the two outer half-rings 37 together, thus clamping and positioning the landing gear axle. The semi-annular snap-fit ​​slot and the semi-annular snap-fit ​​strip 39 work together to enable detachable installation between the outer half-ring 37 and the inner half-ring 38. This allows for the selection of inner half-rings of different thicknesses based on the diameter of the landing gear axle, ensuring stable and reliable clamping. The hinge plate 40 connects the two outer half-rings 37, allowing the upper outer half-ring 37 to open and close significantly, preventing it from interfering with the landing gear axle's downward positioning on the lower outer half-ring 37.

[0045] In the multi-degree-of-freedom adjustable landing gear disassembly and assembly device provided by this utility model, the controller adopts an existing single-chip microcomputer control module; the display screen adopts an existing display screen; the lifting drive motor 20, the positioning drive motor 9, the lateral drive motor 29 and the longitudinal drive motor 32 all adopt existing stepper motors, and the lifting drive circuit, the positioning drive circuit, the lateral drive circuit and the longitudinal drive circuit adopt the corresponding stepper motor drive circuit.

[0046] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A landing gear disassembly and assembly device with multi-degree-of-freedom adjustment, characterized in that: It includes a movable base, a lifting mechanism, a fine-tuning mechanism, a bracket adjustment mechanism, a control cabinet (1), and four wheel axle brackets; the lifting mechanism is installed on the movable base; the fine-tuning mechanism is installed on the lifting mechanism and is driven by the lifting mechanism to move up and down; the bracket adjustment mechanism is installed on the fine-tuning mechanism and is used to adjust the tilt angle of the bracket adjustment mechanism; all four wheel axle brackets are installed on the bracket adjustment mechanism and are used to position the wheel axles of the landing gear, and the bracket adjustment mechanism is used to adjust the distance between the four wheel axle brackets; a controller and a memory electrically connected to the controller are provided in the control cabinet (1); a display screen and a button panel (2) electrically connected to the controller are installed on the control cabinet (1).

2. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 1, characterized in that: The movable base includes a base plate (3), a pull rod (46), and two side plates (4); the two side plates (4) are respectively fixed to the two opposite sides of the base plate (3); two casters (5) are installed at the bottom of each of the two side plates (4); a handle (47) is installed on one end of the pull rod (46), and the other end is installed on one of the side plates (4) through a universal joint (45); positioning branches for positioning support are installed on both side plates (4).

3. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 2, characterized in that: The positioning branch includes a positioning telescopic tube (6), a positioning telescopic rod (7), and a positioning drive motor (9); the positioning telescopic tube (6) is fixed on the side plate (4); the positioning telescopic rod (7) is telescopically installed on the lower end of the positioning telescopic tube (6); a positioning support plate (8) is rotatably installed on the lower end of the positioning telescopic tube (6); the positioning drive motor (9) drives the positioning telescopic rod (7) to extend and retract through the positioning support screw, and is electrically connected to the controller through the positioning drive circuit.

4. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 1, characterized in that: The lifting mechanism includes a lifting frame (10), a lifting drive motor (20), and a screw lifting platform; the screw lifting platform is installed on a movable base; the output shaft of the lifting drive motor (20) is connected to the input end of the screw lifting platform and is electrically connected to the controller through the lifting drive circuit; the lifting frame (10) is installed on the screw lifting platform, and the fine adjustment mechanism is installed on the lifting frame (10), and the screw lifting platform drives the lifting frame (10) to rise and fall.

5. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 4, characterized in that: The fine-tuning mechanism includes a fine-tuning frame (27) and two manual screw jacks (22); one longitudinal edge of the fine-tuning frame (27) is oscillatingly mounted on the lifting frame (10), and two fine-tuning seats (23) are laterally slidably mounted on the lower side of the opposite side of the fine-tuning frame (27); both manual screw jacks (22) are mounted on the lifting frame (10), and their input shafts are connected to each other through a third transmission shaft; a wheel (25) is mounted on the input shaft of one of the manual screw jacks (22); the upper ends of the lifting screws of the two manual screw jacks (22) are respectively hinged to the lower side of the two fine-tuning seats (23).

6. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 1, characterized in that: The bracket adjustment mechanism includes a lateral adjustment unit and two longitudinal adjustment units; the lateral adjustment unit includes a lateral drive motor (29), a lateral drive screw (30), and two lateral moving seats (31); the two lateral moving seats (31) are laterally slidably mounted on the fine adjustment mechanism; the lateral drive motor (29) drives the two lateral moving seats (31) to move closer or further apart through the lateral drive screw (30), and is electrically connected to the controller through the lateral drive circuit; the two longitudinal adjustment units are respectively mounted on the two lateral moving seats (31); the four wheel axle brackets are mounted in pairs on the two longitudinal adjustment units, and the longitudinal spacing between the two wheel axle brackets in the same group is adjusted by the longitudinal adjustment units.

7. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 6, characterized in that: The longitudinal adjustment unit includes a longitudinal drive motor (32), a longitudinal drive screw (36), and two longitudinal moving seats (33); the two longitudinal moving seats (33) are longitudinally slidably mounted on the transverse moving seat (31); the longitudinal drive motor (32) drives the two longitudinal moving seats (33) to move closer or further apart relative to each other through the longitudinal drive screw (36), and is electrically connected to the controller through the longitudinal drive circuit; the wheel axle bracket is mounted on the longitudinal moving seat (33).

8. The multi-degree-of-freedom adjustable landing gear disassembly and assembly device according to claim 1, characterized in that: The wheel axle bracket includes a mounting plate (44), two outer half rings (37) and two inner half rings (38); the two inner half rings (38) are detachably installed inside the two outer half rings (37); the mounting plate (44) is installed on the bracket adjustment mechanism; the lower outer half ring (37) is fixed on the mounting plate (44); the upper outer half ring (37) is hinged to the lower outer half ring (37) by a hinge piece (40); a locking screw (42) is oscillatingly installed on the lower outer half ring; a locking seat (43) for locking the locking screw (42) is provided on the upper outer half ring (37); a hand-tightening nut (41) for pressing tightly against the locking seat (43) is threaded onto the locking screw (42).

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