C919 main landing gear inner barrel mounting device

Abstract

The present application relates to the technical field of civil aircraft C919 main landing gear maintenance equipment, and discloses a C919 main landing gear inner tube mounting device, which comprises a bottom frame assembly, a heading adjusting assembly, a heading angle adjusting assembly, a manual hydraulic lifting assembly, a span adjusting assembly, a hoop assembly and a safety locking device, and the side of the heading angle adjusting assembly is provided with an inclinometer; the bottom frame assembly comprises a welded frame, a handrail is welded on the welded frame, and a track for providing guidance for the heading adjusting assembly is welded on the welded frame, and the bottom of the welded frame is provided with universal wheel one and universal wheel two; the present application is accurate in mechanical adjustment and auxiliary system, so that the assembly process of the main landing gear inner tube and the outer tube is more accurate. Through the cooperative action of the heading adjusting assembly, the heading angle adjusting assembly and the span adjusting assembly, accurate adjustment of the inner tube in multiple directions can be realized, the coaxiality and concentricity of the inner tube and the outer tube are ensured, and the assembly precision and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the technical field of maintenance equipment for the main landing gear of the C919 civil aircraft, and particularly to equipment for installing the inner cylinder of the C919 main landing gear. Background Technology

[0002] With the development of the aviation industry, especially the research and development of large aircraft such as the C919, the assembly and maintenance of the main landing gear has become increasingly complex. As a key component, the precision, efficiency, and safety of the C919's main landing gear inner cylinder assembly directly affect the overall performance and safety of the aircraft. However, there are currently many challenges and difficulties in the assembly process of the main landing gear inner cylinder.

[0003] First, the assembly of the C919's main landing gear inner and outer cylinders requires ensuring coaxiality and precise control of their relative positions, placing extremely high demands on the operators' accuracy and physical strength. Existing equipment often relies on manual operation, which is susceptible to fatigue and distraction, leading to operational errors and affecting assembly quality. Especially during the placement and securing of the inner cylinder, workers need to support it for extended periods, increasing safety risks and labor intensity.

[0004] Secondly, during the assembly of the inner and outer cylinders, the angle and position of the inner cylinder require precise adjustment. Existing equipment often relies solely on angle adjustment shims or manual adjustment, lacking effective automated control and failing to ensure accuracy and stability. This can easily lead to assembly problems due to minor errors. Furthermore, due to the complex structure of the equipment, precise adjustment and positioning are difficult to achieve during assembly.

[0005] To address these issues, there is an urgent need for a new device to improve the assembly accuracy and efficiency of the main landing gear inner cylinder, while reducing the risks and labor intensity associated with manual operation and ensuring the safety and repeatability of the assembly process. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a C919 main landing gear inner cylinder installation device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The C919 main landing gear inner cylinder installation equipment includes a base frame assembly, a heading adjustment assembly, a heading angle adjustment assembly, a manual hydraulic lifting assembly, a span adjustment assembly, a clamp assembly, and a safety locking device. The heading angle adjustment assembly has an inclinometer mounted on its side. The base frame assembly includes a welded frame with handrails and a guide rail for the heading adjustment assembly welded onto it. The bottom of the welded frame has two casters. The clamp assembly includes a swivel support with a left clamp and a right clamp mounted on it via shoulder screws. The swivel support has quick-release pins to limit the opening positions of the left and right clamps. A rotating screw is mounted on the left clamp, and a star-shaped handle is fitted onto the rotating screw.

[0009] Preferably, the heading adjustment assembly includes a heading adjustment welding frame movably assembled with a track via a roller bearing. A vertical bearing seat is provided at the top of the heading adjustment welding frame, and a lead screw nut is provided at the bottom of the heading adjustment welding frame. An adjusting lead screw is movably mounted at one end of the welding frame, and a lead screw nut is fitted onto the adjusting lead screw. A handwheel is provided at one end of the adjusting lead screw, and a heading scale is provided on the welding frame for observing the adjustment distance of the heading adjustment welding frame.

[0010] Preferably, the heading angle adjustment component includes two parallel vertical rails, with an upper pull rod and a lower pull rod installed at the top and bottom of the vertical rails respectively. The lower pull rod, the upper pull rod, and the vertical rails are assembled into a rectangular frame. The sides of both vertical rails are provided with a rotating shaft, and the rotating shaft is movably connected to a vertical bearing seat to form a rotating hinge point.

[0011] Preferably, a common channel steel connecting rod is provided between the two vertical rails. A ball head adjusting screw is installed on the side of the channel steel connecting rod through a support. A rotating screw nut is sleeved on the ball head adjusting screw. The bottom of the rotating screw nut is connected to the heading adjustment welding frame. A handwheel is provided at the end of the ball head adjusting screw away from the channel steel connecting rod.

[0012] Preferably, the manual hydraulic lifting assembly includes a lifting welding frame, the side of which is movably connected to a vertical track via roller bearings, a hydraulic cylinder is mounted on the lifting welding frame, and a lifting crossbeam is provided at one end of the piston rod of the hydraulic cylinder; a plate chain is provided on the lifting welding frame, and the end of the plate chain away from the lifting welding frame passes around the lifting crossbeam and connects to the channel steel connecting rod.

[0013] Preferably, a manual pump is installed on the welding frame. The manual pump is connected to a hydraulic cylinder via a hydraulic hose and is used to provide power for the rise of the inner cylinder of the C919 main landing gear.

[0014] Preferably, the span adjustment assembly includes two guide shaft supports mounted on the lifting welding frame, a guide shaft is provided between the two guide shaft supports, a guide copper sleeve is mounted on the guide shaft through a vertical bearing seat two, and a span adjustment welding frame is mounted on one side of the guide copper sleeve; an adjusting screw two is mounted on the side of the span adjustment welding frame, a screw nut two is sleeved on the adjusting screw two, the side of the screw nut two is connected to the lifting welding frame, and a handwheel three is provided at one end of the adjusting screw two; a top socket adapter is provided at the bottom of the span adjustment welding frame, which cooperates with the ball joint below the inner cylinder of the C919 main landing gear.

[0015] Preferably, the lifting welding frame is provided with a spanning scale for observing the adjustment distance of the guide copper sleeve and the spanning adjustment welding frame.

[0016] Preferably, the rotating support is mounted above the spanwise adjustable welding frame.

[0017] Preferably, the safety locking device includes a ratchet welded to the side of the vertical track, and a support, a pawl, and a compression spring are mounted together on the span adjustment welding frame for self-locking of the C919 main landing gear inner cylinder during lifting.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. Improved Precision and Efficiency: This equipment, through precise mechanical adjustments and auxiliary systems, makes the assembly process of the main landing gear inner and outer cylinders more accurate. The coordinated action of the heading adjustment assembly, heading angle adjustment assembly, and span adjustment assembly enables precise adjustment of the inner cylinder in multiple directions, ensuring that the inner and outer cylinders are coaxial and concentric, thus improving assembly accuracy and efficiency.

[0020] 2. Reduce labor intensity and fatigue risk: The manual hydraulic lifting function and automatic adjustment system of the equipment greatly reduce the need for manual operation. Especially during the lifting and fine adjustment of the inner cylinder, operators no longer need to support and adjust the inner cylinder for a long time, which reduces physical burden and avoids errors caused by fatigue, thus improving operational safety and stability.

[0021] 3. Enhanced Safety: This equipment employs a safety locking device to ensure that the inner cylinder will not slide or fall in the event of hydraulic system failure or other abnormalities. Through the engagement of the ratchet and pawl, the safety locking device automatically locks in the event of hydraulic failure, preventing accidents caused by operational errors or equipment malfunctions, and providing additional safety assurance.

[0022] 4. Reduced human error and operational difficulty: The equipment's multiple adjustment components (such as heading adjustment components, heading angle adjustment components, span adjustment components, etc.) can quickly and accurately adjust various parameters of the inner cylinder through lead screw adjustment, handwheel control, and precision scales. Due to the equipment's high repeatability, it ensures that each operation achieves the same precision standard, reducing errors caused by manual operation.

[0023] 5. Easy to operate and maintain: The equipment adopts a simple and reliable hydraulic system and mechanical adjustment structure, with a clear operating interface and convenient maintenance. The hydraulic system provides stable lifting power, while the manual pump design ensures operation even in emergencies, greatly improving operational flexibility and reliability.

[0024] 6. Adaptable to Complex Working Conditions: This equipment is particularly suitable for complex working environments requiring high precision, high safety, and high reliability. During the assembly of the C919 main landing gear inner cylinder, due to its complex structure and high precision requirements, this equipment provides stable technical support, ensuring that the inner and outer cylinders can be accurately assembled, thereby avoiding assembly problems caused by errors.

[0025] 7. Visualized and Adjustable Operation: The spread scale, inclinometer, and other precise adjustment devices on the equipment enhance the visualization of the adjustment process, enabling operators to monitor and adjust the position in real time to ensure precise alignment of the inner and outer cylinders. This visualization and adjustment functionality makes the equipment more user-friendly and reduces the risks associated with improper operation or inaccurate adjustment. Attached Figure Description

[0026] Figure 1 This is a side view of the C919 main landing gear inner cylinder mounting device proposed in an embodiment of the present invention;

[0027] Figure 2 This is a first-view structural schematic diagram of the C919 main landing gear inner cylinder mounting device proposed in an embodiment of the present invention;

[0028] Figure 3 This is a second-view structural schematic diagram of the C919 main landing gear inner cylinder mounting device proposed in an embodiment of the present invention;

[0029] Figure 4 for Figure 2 Enlarged view of the local structure at point A in the middle.

[0030] In the diagram: 1-Base frame assembly, 10-Handrail, 11-Universal wheel one, 12-Welded frame, 13-Rail, 14-Universal wheel two, 2-Heading adjustment assembly, 20-Vertical bearing seat one, 21-Heading adjustment welded frame, 22-Screw nut one, 23-Adjusting screw one, 24-Handwheel one, 25-Heading scale, 26-Roller bearing one, 3-Heading angle adjustment assembly, 30-Handwheel two, 31-Ball head adjusting screw, 32-Rotating screw nut, 33-Support one, 34-Channel steel connecting rod, 35-Pull-down rod, 36-Pull-up plate, 37-Vertical track, 38-Rotating shaft, 4-Manual hydraulic lifting assembly, 40-Lifting beam, 41-Roller bearing two, 42-Hydraulic... 43-Plate chain, 44-Lifting welded frame, 45-Hydraulic hose, 46-Manual pump, 5-Extension adjustment assembly, 50-Extension scale, 51-Guide copper sleeve, 52-Guide shaft, 53-Guide shaft support, 54-Extension adjustment welded frame, 55-Screw nut II, 56-Adjusting screw II, 57-Vertical bearing seat II, 58-Handwheel III, 59-Top socket adapter, 6-Clamping assembly, 60-Quick release pin, 61-Shoulder screw, 62-Rotating support, 63-Left clamp, 64-Right clamp, 65-Rotating screw, 66-Star handle, 7-Safety locking device, 70-Ratchet, 71-Support II, 72-Pawl, 73-Compression spring, 8-Inclinometer. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] In one embodiment, refer to Figures 1 to 4 The C919 main landing gear inner cylinder installation equipment includes a base frame assembly 1, a heading adjustment assembly 2, a heading angle adjustment assembly 3, a manual hydraulic lifting assembly 4, a span adjustment assembly 5, a clamp assembly 6, and a safety locking device 7. An inclinometer 8 is installed on the side of the heading angle adjustment assembly 3. The base frame assembly 1 includes a welded frame 12, on which a handrail 10 and a guide rail 13 for the heading adjustment assembly 2 are welded. A caster wheel 11 and a caster wheel 14 are installed at the bottom of the welded frame 12. The clamp assembly 6 includes a swivel support 62, on which a left clamp 63 and a right clamp 64 are mounted via shoulder screws 61. A quick-release pin 60 is provided on the swivel support 62 to limit the opening position of the left clamp 63 and the right clamp 64. A rotating screw 65 is installed on the left clamp 63, and a star-shaped handle 66 is fitted onto the rotating screw 65.

[0033] After pushing the equipment to the work area, the equipment is secured by depressing the brakes on casters 11 and 14 to ensure stability. The left and right clamps 64 in clamp assembly 6 are then opened to their maximum positions. Next, the C919 main landing gear inner tube is manually lifted, aligning the ball joint below the inner tube with the top socket adapter. At this point, the left and right clamps 63 and 64 are closed and tightened using the rotating screw 65 and star handle 66, securing the C919 main landing gear inner tube and ensuring no accidental displacement during assembly. Clamp assembly 6 effectively secures the inner tube using the rotating screw 65 and quick-release pin 60, preventing accidental displacement during installation. The design of the rotating support 62 and quick-release pin 60 further enhances the stability and safety of the equipment. The heading adjustment assembly 2 can be precisely adjusted via the track 13 set on the welded frame 12. At this point, the operator can precisely adjust the heading position of the main landing gear inner cylinder by adjusting the lead screw nut and handwheel, and use the heading angle adjustment component 3 to achieve precise adjustment of the heading angle. An inclinometer 8 is mounted on the side of the heading angle adjustment assembly to monitor the adjusted angle in real time, ensuring that the inner and outer tubes of the C919 main landing gear are coaxial, thus improving the accuracy during installation. The spanwise adjustment assembly 5 precisely adjusts the spanwise position of the C919 main landing gear inner tube to ensure that it can align with the outer tube. During the assembly of the inner tube, the manual hydraulic lifting assembly 4 raises or lowers the inner tube to ensure that it reaches the correct assembly height, simplifying the up-and-down adjustment process of the inner tube and avoiding the tediousness of manual lifting or repeated adjustments. The safety locking device 7 provides a self-locking function to prevent the inner tube from suddenly falling in the event of hydraulic failure, increasing the safety during operation. This equipment not only solves many problems in traditional manual operation, such as fatigue, errors, and insufficient assembly accuracy, but also improves installation efficiency and enhances operational safety, making it particularly suitable for the installation of the C919 main landing gear inner tube, which requires high precision and high safety.

[0034] In a preferred embodiment of the present invention, the heading adjustment assembly 2 includes a heading adjustment welding frame 21 movably assembled with the track 13 via a roller bearing 26. A vertical bearing seat 20 is provided at the top of the heading adjustment welding frame 21, and a lead screw nut 22 is provided at the bottom of the heading adjustment welding frame 21. An adjusting lead screw 23 is movably mounted at one end of the welding frame 12, and the lead screw nut 22 is sleeved on the adjusting lead screw 23. A handwheel 24 is provided at one end of the adjusting lead screw 23, and a heading scale 25 is provided on the welding frame 12 for observing the adjustment distance of the heading adjustment welding frame 21.

[0035] The core function of the heading adjustment assembly 2 is to adjust the heading of the inner cylinder of the C919 main landing gear, ensuring accurate heading alignment when the inner cylinder docks with the outer cylinder. The heading adjustment assembly 2 is designed with precision, efficiency, and safety in mind. It simplifies the operation process through mechanized adjustment, ensuring high precision and safety in the assembly process.

[0036] During operation, after the equipment is positioned, rotating handwheel 24 initiates the rotation of adjusting screw 23, causing screw nut 22 to move axially, which in turn drives the heading adjustment welding frame 21 to precisely translate along track 13. During this process, roller bearing 26 engages with track 13 to ensure smooth frame movement, reduce friction, and guarantee smooth adjustment. The operator observes the adjustment distance using heading scale 25, monitoring the adjustment process in real time to ensure accurate heading adjustment. When the frame reaches the desired position, the operator stops rotating the handwheel and locks the adjustment system, completing the heading alignment.

[0037] This design achieves high-precision heading adjustment, with lead screw adjustment providing meticulous control to ensure accurate heading alignment during the assembly of the inner and outer cylinders. Roller bearings and a track system ensure smooth adjustment, significantly reducing instability caused by friction and other factors. Furthermore, operation is simple; with the aid of a 25-degree heading scale, the operator can easily judge the adjustment distance, saving time and improving operational efficiency. The mechanized adjustment method reduces human error and fatigue, improves safety, and avoids assembly problems caused by inaccurate adjustments. The overall design not only improves work efficiency but also extends the equipment's service life, exhibiting high reliability and durability, making it particularly suitable for high-precision main landing gear inner cylinder assembly.

[0038] In a preferred embodiment of the present invention, the heading angle adjustment component 3 includes two parallel vertical rails 37. An upper pull rod 36 and a lower pull rod 35 are respectively installed at the top and bottom of the vertical rails 37. The lower pull rod 35, upper pull rod 36, and vertical rails 37 are assembled into a rectangular frame. Rotating shafts 38 are provided on the sides of both vertical rails 37. The rotating shafts 38 are movably connected to a vertical bearing seat 20 to form a rotating hinge point. A common channel steel connecting rod 34 is provided between the two vertical rails 37. A ball-head adjusting screw 31 is installed on the side of the channel steel connecting rod 34 via a support 33. A rotating screw nut 32 is sleeved on the ball-head adjusting screw 31. The bottom of the rotating screw nut 32 is connected to the heading adjustment welding frame 21. A handwheel 30 is provided at the end of the ball-head adjusting screw 31 away from the channel steel connecting rod 34.

[0039] The heading angle adjustment assembly 3, through its precise mechanical design and stable working principle, enables accurate adjustment of the angle between the inner and outer cylinders of the C919 main landing gear. The operator rotates handwheel 2 30 to adjust the ball joint adjusting screw 31, which in turn rotates the screw nut 32, moving it along the screw axis and causing the vertical track 37 frame to rotate, thereby adjusting the angle of the inner cylinder. The rotating shaft 38 provides stable rotational support, ensuring a smooth, stable, and controllable angle adjustment process. These precise adjustment mechanisms ensure high-precision control of the heading angle, allowing the inner and outer cylinders to perfectly align. Furthermore, the design of the heading angle adjustment assembly 3 optimizes the operating process, allowing the operator to directly perform fine angle adjustments by rotating handwheel 2 30, reducing the possibility of human error. Simultaneously, the cooperation between the channel steel connecting rod 34 and the support 33 enhances the rigidity and stability of the structure, making deformation less likely during adjustment and ensuring accuracy and safety. The overall design is simple and efficient, not only improving work efficiency but also reducing labor intensity, making it particularly suitable for assembly tasks requiring high precision and high repeatability. Through this structured adjustment method, the heading angle adjustment component 3 can maintain consistency in different batches of assembly, ensuring high efficiency and durability in long-term use.

[0040] In a preferred embodiment of the present invention, the manual hydraulic lifting assembly 4 includes a lifting welding frame 44, the side of which is movably engaged with a vertical rail 37 via a roller bearing 41. A hydraulic cylinder 42 is mounted on the lifting welding frame 44, and a lifting crossbeam 40 is provided at one end of the piston rod of the hydraulic cylinder 42. A plate chain 43 is provided on the lifting welding frame 44, and the end of the plate chain 43 away from the lifting welding frame 44 passes around the lifting crossbeam 40 and is connected to a channel steel connecting rod 34. A manual pump 46 is mounted on the welding frame 12, and the manual pump 46 is connected to the hydraulic cylinder 42 via a hydraulic hose 45 to provide power for the lifting of the inner cylinder of the C919 main landing gear.

[0041] The lifting welding frame 44 is connected to the vertical rail 37 via roller bearing 41, ensuring smooth movement of the lifting welding frame 44 on the rail. This design effectively avoids jamming or uneven lifting caused by friction during the lifting process. The hydraulic cylinder 42 on the lifting welding frame 44 provides power for lifting via a hydraulic system. One end of the piston rod of the hydraulic cylinder 42 is connected to the lifting beam 40. When the hydraulic system is pressurized, the hydraulic cylinder 42 pushes the lifting beam upward, thereby raising the entire lifting frame and precisely controlling the lifting process of the C919 main landing gear inner cylinder.

[0042] In addition, a plate chain 43 is installed on the lifting frame. One end of the chain passes around the lifting beam 40 and connects to the channel steel connecting rod 34. The function of the plate chain 43 is to transmit the movement of the lifting beam 40 to other connecting parts, ensuring the synchronization and stability of the lifting process, avoiding any deviation or uneven movement on either side during the lifting process, thereby ensuring the accurate lifting position of the inner cylinder and meeting the assembly accuracy requirements.

[0043] Under the control of the hydraulic system, the manual pump 46 is connected to the hydraulic cylinder 42 via a hydraulic hose 45. When the operator pushes the hydraulic fluid through the manual pump 46, the pressure inside the hydraulic cylinder 42 increases, pushing the piston rod and the lifting beam 40 to achieve lifting and lowering. The operation of the manual pump 46 is very simple. The operator only needs to pressurize the hydraulic cylinder 42 through the manual pump 46, which can precisely control the lifting speed and height. Moreover, by observing the pressure gauge on the manual pump 46, the operator can monitor the pressure changes of the C919 main landing gear inner cylinder in real time during the installation process, avoiding damage to the inner and outer cylinders due to misoperation or improper assembly, and adapting to different assembly requirements.

[0044] In a preferred embodiment of the present invention, the spanwise adjustment assembly 5 includes two guide shaft supports 53 mounted on the lifting welding frame 44, a guide shaft 52 is disposed between the two guide shaft supports 53, a guide copper sleeve 51 is mounted on the guide shaft 52 via a vertical bearing seat 57, and a spanwise adjustment welding frame 54 is mounted on one side of the guide copper sleeve 51; an adjusting screw 56 is mounted on the side of the spanwise adjustment welding frame 54, a screw nut 55 is sleeved on the adjusting screw 56, the side of the screw nut 55 is connected to the lifting welding frame 44, and a handwheel 58 is provided at one end of the adjusting screw 56; a top socket adapter 59 is provided at the bottom of the spanwise adjustment welding frame 54, which cooperates with the ball joint below the inner cylinder of the C919 main landing gear.

[0045] The spanwise adjustment assembly 5, through its precise mechanical structure, ensures the spanwise adjustment accuracy of the C919 main landing gear inner cylinder during assembly. By precisely adjusting the lead screw 2 56 and lead screw nut 2 55, the operator can accurately adjust the spanwise position of the inner cylinder, ensuring precise alignment with the outer cylinder. The design of the guide shaft 52 and guide bushing 51 provides smooth and stable movement support, minimizing friction and resistance during adjustment, thereby improving the stability and efficiency of the adjustment process.

[0046] The design of the adjusting screw 2 56 makes the longitudinal adjustment process more precise and controllable, while the application of the handwheel 3 58 simplifies operation. Operators can easily adjust and ensure high precision, reducing errors caused by improper human operation. During longitudinal adjustment, the cooperation between the top socket adapter 59 and the ball head ensures accurate positioning of the inner cylinder during the adjustment process, preventing the inner cylinder from shifting or becoming unstable during movement.

[0047] This design significantly improves the accuracy and efficiency of the entire installation process, especially when performing the same operation multiple times, maintaining consistent precision standards. The entire system has a reasonable structure and is easy to operate, making it particularly suitable for landing gear assembly tasks with high precision requirements. Through this efficient and stable adjustment mechanism, not only is work efficiency improved, but the safety of operators is also ensured, the impact of human error on assembly quality is reduced, and the high-quality requirements of the C919 main landing gear inner cylinder assembly are guaranteed.

[0048] In a preferred embodiment of the present invention, a spanwise scale 50 is provided on the lifting welding frame 44 for observing the adjustment distance of the guide copper sleeve 51 and the spanwise adjusting welding frame 54.

[0049] The spanwise scale 50 provides clear numerical markings, helping operators intuitively track the adjustment distance between the guide copper sleeve 51 and the spanwise adjustment welding frame 54. Through the spanwise scale 50, operators can observe positional changes in real time during the adjustment process, ensuring that every step of the spanwise adjustment is precise and avoiding errors caused by unclear perspective or improper adjustment. The scale design of the spanwise scale 50 not only simplifies the adjustment process but also improves the accuracy and reliability of the operation, enabling the inner cylinder to accurately meet the requirements for docking with the outer cylinder during assembly.

[0050] This design significantly improves operational efficiency and adjustment accuracy, reducing human error. Particularly in multiple assembly tasks, the spanwise scale 50 ensures consistency and high standards in each adjustment, avoiding the tedious step of re-measuring for every adjustment. This design makes the entire assembly process simpler, more efficient, and more precise, thus ensuring the quality and safety of the C919 main landing gear inner cylinder assembly.

[0051] In a preferred embodiment of the present invention, the rotating support 62 is mounted above the spanwise adjusting welding frame 54.

[0052] As a preferred embodiment of the present invention, the safety locking device 7 includes a ratchet 70 welded to the side of the vertical track 37, and a support 71, a pawl 72 and a compression spring 73 assembled together are installed on the span adjustment welding frame 54 for self-locking of the inner cylinder of the C919 main landing gear during the lifting process.

[0053] The safety locking device 7 operates on the principle of meshing between the ratchet 70 and the pawl 72. The spring force provided by the compression spring 73 ensures that the pawl 72 remains engaged with the ratchet 70. When the hydraulic system raises or lowers the inner cylinder, the pawl 72 automatically engages with the teeth of the ratchet 70, preventing the inner cylinder from sliding or shifting position due to hydraulic failure or other reasons. Whether in normal operation or during a hydraulic system malfunction, the safety locking device 7 always ensures the safe position of the inner cylinder, preventing accidental falls or loosening, thereby improving operational safety.

[0054] This design significantly enhances the safety and stability of the equipment. Through a self-locking mechanism, the safety locking device 7 prevents dangerous situations caused by external factors such as improper operation or hydraulic failure, especially during high-risk equipment adjustment or handling. It not only reduces the risk of equipment damage due to human negligence or technical problems but also provides operators with greater safety assurance, preventing potential accidents and ensuring the efficiency and safety of the C919 main landing gear inner cylinder assembly.

[0055] This device makes the lifting and adjustment process of the inner cylinder more reliable and safer. In the event of hydraulic system failure or other emergencies, it can effectively prevent the inner cylinder from accidentally sliding down, ensuring the safety of the operator and the integrity of the equipment. At the same time, the safety locking device 7 is simple in design, highly reliable, and easier to maintain and operate. It is a key component in ensuring the safe and smooth assembly of the landing gear inner cylinder.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. C919 main landing gear inner cylinder installation equipment, characterized in that, It includes a base frame assembly (1), a heading adjustment assembly (2), a heading angle adjustment assembly (3), a manual hydraulic lifting assembly (4), a span adjustment assembly (5), a clamp assembly (6), and a safety locking device (7). An inclinometer (8) is provided on the side of the heading angle adjustment assembly (3). The bottom frame assembly (1) includes a welded frame (12), on which a handrail (10) and a track (13) for guiding the heading adjustment assembly (2) are welded. The bottom of the welded frame (12) is provided with a first universal wheel (11) and a second universal wheel (14). The clamp assembly (6) includes a rotating support (62), on which a left clamp (63) and a right clamp (64) are mounted via shoulder screws (61). The rotating support (62) is provided with quick-release pins (60) for limiting the opening positions of the left clamp (63) and the right clamp (64). A rotating screw (65) is mounted on the left clamp (63), and a star-shaped handle (66) is fitted onto the rotating screw (65). The heading adjustment assembly (2) includes a heading adjustment welded frame (21) movably assembled with a track (13) via a roller bearing (26). The top of the heading adjustment welding frame (21) is provided with a vertical bearing seat (20), and the bottom of the heading adjustment welding frame (21) is provided with a screw nut (22). One end of the welding frame (12) is movably installed with an adjusting screw (23), and the screw nut (22) is sleeved on the adjusting screw (23). One end of the adjusting screw (23) is provided with a handwheel (24). The welding frame (12) is provided with a heading scale (25) for observing the adjustment distance of the heading adjustment welding frame (21). The heading angle adjustment assembly (3) includes two parallel... The vertical rail (37) has an upper pull rod (36) and a lower pull rod (35) installed at its top and bottom respectively. The lower pull rod (35), the upper pull rod (36) and the vertical rail (37) are assembled into a rectangular frame. The two vertical rails (37) are provided with a rotating shaft (38) on their sides. The rotating shaft (38) is movably connected to the vertical bearing seat (20) to form a rotating hinge point. The two vertical rails (37) are provided with the same channel steel connecting rod (34). The side of the channel steel connecting rod (34) is equipped with a ball head adjusting screw (31) through the support (33). A rotating screw nut (32) is fitted on the rod (31). The bottom of the rotating screw nut (32) is connected to the heading adjustment welding frame (21). A handwheel (30) is provided at the end of the ball head adjusting screw (31) away from the channel steel connecting rod (34). The manual hydraulic lifting assembly (4) includes a lifting welding frame (44). The side of the lifting welding frame (44) is movably connected to the vertical rail (37) through a roller bearing (41). A hydraulic cylinder (42) is installed on the lifting welding frame (44). A lifting crossbeam (40) is provided at one end of the piston rod of the hydraulic cylinder (42).A plate chain (43) is provided on the lifting welding frame (44). The end of the plate chain (43) away from the lifting welding frame (44) passes around the lifting crossbeam (40) and is connected to the channel steel connecting rod (34). A manual pump (46) is installed on the welding frame (12). The manual pump (46) is connected to the hydraulic cylinder (42) through the hydraulic hose (45) to provide power for the rise of the inner cylinder of the C919 main landing gear. The span adjustment assembly (5) includes two guide shaft supports (53) installed on the lifting welding frame (44). A guide shaft (52) is provided between the two guide shaft supports (53). A guide copper sleeve (51) is installed on the guide shaft (52) through the vertical bearing seat (57). A span adjustment welding frame (54) is installed on one side of the guide copper sleeve (51). An adjusting screw 2 (56) is installed on the side of the frame (54), and a screw nut 2 (55) is fitted on the adjusting screw 2 (56). The side of the screw nut 2 (55) is connected to the lifting welding frame (44). A handwheel 3 (58) is provided at one end of the adjusting screw 2 (56). A top socket adapter (59) is provided at the bottom of the spanwise adjusting welding frame (54), which cooperates with the ball head below the inner cylinder of the C919 main landing gear. The rotating support (62) is installed above the spanwise adjusting welding frame (54). The safety locking device (7) includes a ratchet (70) welded to the side of the vertical rail (37). The spanwise adjusting welding frame (54) is equipped with a support 2 (71), a pawl (72), and a compression spring (73) assembled together for self-locking of the inner cylinder of the C919 main landing gear during the lifting process.

2. The C919 main landing gear inner cylinder installation device according to claim 1, characterized in that, The lifting welding frame (44) is equipped with a spanning scale (50) for observing the adjustment distance of the guide copper sleeve (51) and the spanning adjustment welding frame (54).

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