Aircraft landing gear welding device and method thereof

Abstract

The present invention discloses an aircraft landing gear welding device and a method thereof, and relates to the technical field of landing gear processing. The present invention comprises a processing table, a flexible bracket is fixed on one side of the top of the processing table, a welding device body is fixed on one end of the flexible bracket away from the processing table, an adapting device is fixed on the top of the processing table, and the adapting device comprises a push plate, an elastic return plate, a U-shaped frame, two hydraulic cylinders, two slide plates, two long openings, and two slide bars. The present invention arranges the adapting device so that the hydraulic cylinder, the push plate, the slide plate, the elastic return plate, the long opening, the U-shaped frame, and the slide bar cooperate, so that the curved long opening can limit the moving position of the welding device body through the U-shaped frame, thereby ensuring that the distance between the welding device body and the two round tube welds is stable, thereby reducing the uneven welds or welding defects caused by the welding device body being too close or too far from the two round tube welds.

Description

Technical Field

[0001] The invention relates to the technical field of landing gear processing, and in particular to an aircraft landing gear welding device and a method thereof. Background Art

[0002] The aircraft landing gear is a key component that supports the landing and take-off of the aircraft, and bears impact and load. It consists of a strong structure and a complex mechanical system to ensure that the aircraft can stably and safely contact the ground and take off smoothly. During the landing gear processing, the two round tubes of the landing gear need to be butt-welded, which requires the use of welding equipment.

[0003] A Chinese patent with patent announcement number CN213857763U discloses an aerospace aircraft landing gear welding device, including a shell, a cooling chamber is arranged on the left side of the shell, a coolant tank is fixedly connected to the left side of the bottom of the inner wall of the cooling chamber, and a pressure pump is fixedly connected to the lower left side of the inner wall of the cooling chamber. In this patent, the automatic lifting function of the fixed frame and the clamping element is first realized by cooperating with the motor through the gear and the screw, and then the rotatable driving shaft is coordinated with the welding elements on the first screw element and the second screw element to realize automatic welding, and the welding slag generated by the welding is also avoided from splashing everywhere. By installing a coolant tank at the position of the inner outlet of the shell, the coolant in the coolant tank is pressurized and sprayed from the spray head through the installed pressure pump, the workpiece after welding is cooled, the completion of welding is accelerated, and personnel are prevented from being injured due to the high temperature of welding. It is worth promoting vigorously.

[0004] However, the current welding device has the following problems: when the welding device is used to butt-weld two round tubes of the landing gear, it is not convenient to control the distance between the welding device and the welds of the two round tubes. The unstable distance between the welding device and the welds of the two round tubes will lead to uneven distribution of the molten pool during welding, resulting in inconsistent weld thickness, which in turn affects the welding quality. Therefore, we propose a welding device and method for aircraft landing gear. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an aircraft landing gear welding device and method thereof, which solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an aircraft landing gear welding device, comprising a processing table, a flexible bracket is fixed on one side of the top of the processing table, a welding device body is fixed on the end of the flexible bracket away from the processing table, an adapting device is fixed on the top of the processing table, and the adapting device comprises a push plate, an elastic return plate, a U-shaped frame, two hydraulic cylinders, two slide plates, two long openings, and two sliding rods. The two hydraulic cylinders are respectively fixed on both sides of the top of the processing table, and the telescopic ends of the two hydraulic cylinders pass through the top of the processing table, the push plate is fixed to the bottom of the telescopic ends of the two hydraulic cylinders, the two slide plates are respectively slidably installed on both sides of the top of the push plate, the elastic return plate is fixed between the tops of one side of the two slide plates close to each other, the two long openings are respectively opened on the front and rear sides of the elastic return plate, the two slide bars are respectively slidably installed on the front and rear sides of the top of the elastic return plate, the U-shaped The frame is fixed between the tops of the two sliding bars, and the two legs of the U-shaped frame are slidably installed in the interior of the long mouth respectively, and a through hole for the sliding plates to slide is opened on the top of the processing table, and the welding device body is fixed to the top of the U-shaped frame by bolts, and the telescopic end of the hydraulic cylinder pushes the push plate to move downward, and the push plate drives the elastic back-shaped plate to move downward through the slide plate. After the elastic back-shaped plate contacts the outer wall of the circular tube and continues to move downward, the elastic back-shaped plate will stick to the arc surface of the circular tube and bend and deform, and the elastic back-shaped plate drives the long mouth to bend, and the elastic back-shaped plate will drive the slide plate to move toward the center of the push plate during the bending deformation process. At this time, the welding device body is started, and the U-shaped frame is pushed to slide along the inside of the long mouth, and the U-shaped frame drives the sliding bar to slide along the top of the elastic back-shaped plate. At this time, the U-shaped frame drives the welding device body to weld the butt joints of the two circular tubes, and the bent long mouth will limit the moving position of the welding device body through the U-shaped frame.

[0007] According to the above technical solution, the adaptation device includes a thin plate, which is fixed in the middle of the top surface of the push plate, and the thin plate is located at the center of the processing table. When two round tubes are placed on the processing table, the ends of the two round tubes that are close to each other are attached to the thin plate. During the downward movement of the push plate, the push plate drives the thin plate to move downward, and the thin plate will be pulled out from between the two round tubes.

[0008] According to the above technical solution, a pressing device is provided on the top of the push plate, and the pressing device includes four elastic telescopic rods, which are respectively fixed on the top front side and the top rear side of the push plate, and two of the four elastic telescopic rods form a group, and a round-mouth plate is fixed between the telescopic ends of two adjacent elastic telescopic rods, and a swivel is rotatably installed inside the round mouth of the round-mouth plate, which will drive the elastic telescopic rod to move downward during the downward movement of the push plate, and the telescopic end of the elastic telescopic rod will drive the round-mouth plate to move downward, and the round-mouth plate will drive the swivel to press the two round tubes on the processing table.

[0009] According to the above technical solution, the pressing device also includes a circular frame, four T-shaped columns, two serrated plates, and two toothed rings. The four T-shaped columns are respectively fixed on the tops of the two circular plates. The circular frame is slidably installed on the outside of the four T-shaped columns, and a spring is provided between the circular frame and the T-shaped columns. The two serrated plates are respectively fixed on the front side and the rear side of the bottom of the circular frame. The two toothed rings are respectively fixed on the outside of the rotating rings corresponding to the two circular plates. A plurality of tooth blocks are fixed on the outside of the toothed rings. The bottom of the serrated plate is serrated. The saw of the serrated plate The teeth are in contact with the tooth blocks of the gear ring. When the welding of one side of the two round tubes is completed, it is necessary to rotate the round tube to weld the other parts of the two round tubes. The circular frame is pushed upward, and the circular frame moves upward along the outside of the T-shaped column. The circular frame drives the serrated plate to move upward, and the saw teeth of the serrated plate are separated from the tooth blocks of the gear ring. At this time, the serrated plate does not limit the position of the gear ring, and the gear ring no longer limits the position of the swivel. At this time, the worker can rotate the round tube to switch the welding position of the joint. During the rotation of the round tube, the round mouth plate will still drive the swivel to press the round tube.

[0010] The cam is an angular movement between the two ends of the cam and the two ends of the cam are caused to move relative to each other, the cam being able to move relative to the other ends of the cam and being able to move relative to the other ends of the cam.

[0011] According to the above technical solution, a rubber roller is rotatably installed on one side of the two trapezoidal plates that are close to each other, and the outside of the rubber roller is provided with anti-slip grooves. At the same time, the trapezoidal plate drives the rubber roller to contact the outer wall of the circular tube. When the circular tube rotates, the setting of the rubber roller at the trapezoidal plate ensures that the thrust applied by the trapezoidal plate will not affect the rotation of the circular tube.

[0012] A method for using an aircraft landing gear welding device comprises the following steps:

[0013] S1. Place two round tubes to be welded for the landing gear on the top front side and the top rear side of the processing table respectively, and make the ends of the two round tubes contact each other;

[0014] S2, then, start the hydraulic cylinder, the telescopic end of the hydraulic cylinder pushes the push plate to move downward, and the push plate drives the elastic circular plate to move downward through the slide plate;

[0015] S3. After the elastic return plate contacts the outer wall of the round tube and continues to move downward, the elastic return plate will stick to the curved surface of the round tube and bend, and the elastic return plate will drive the long mouth to bend, and the elastic return plate will drive the slide plate to move toward the center of the push plate during the bending deformation process;

[0016] S4, at this time, the welding device body is started, and the U-shaped frame is pushed to slide along the inside of the long opening, and at the same time, the U-shaped frame drives the slide bar to slide along the top of the elastic circular plate;

[0017] S5. At this time, the U-shaped frame drives the main body of the welding device to weld the joints of the two round tubes.

[0018] The present invention provides an aircraft landing gear welding device and method thereof, which have the following beneficial effects:

[0019] (1) The present invention adapts the device to the arrangement of the hydraulic cylinder, the push plate, the slide plate, the elastic return plate, the long mouth, the U-shaped frame, and the slide rod, so that the curved long mouth can limit the moving position of the welding device body through the U-shaped frame, thereby ensuring that the distance between the welding device body and the welds of the two round tubes is stable, thereby reducing the uneven welds or welding defects caused by the distance between the welding device body and the welds of the two round tubes being too close or too far. At the same time, such an arrangement can enable the welding device to weld landing gear round tubes of different thicknesses; at the same time, the thin plate limits the end surface positions of the two round tubes, thereby ensuring that the weld positions of the two round tubes are directly below the welding device body.

[0020] (2) The present invention sets a pressing device so that the push plate, the elastic telescopic rod, and the round-mouth plate cooperate to drive the rotating ring to press the two round tubes on the processing table, thereby maintaining the stability of the two round tubes during the welding process and ensuring that the position and posture of the two round tubes during the welding process are consistent, thereby improving the welding quality; at the same time, the circular frame, the T-shaped column, the serrated plate, and the gear ring cooperate to drive the gear ring to no longer restrict the position of the rotating ring. At this time, the worker can rotate the round tube to switch the welding position of the joint. During the rotation of the round tube, the round-mouth plate will still drive the rotating ring to press the round tube. This pressing can ensure that the contact surfaces of the two round tubes will not shift due to the operation, thereby maintaining the alignment and consistency of the welding joint. When the serrated plate restricts the position of the gear ring, the gear ring will restrict the position of the rotating ring. At this time, the round tube cannot rotate, thereby avoiding the problem that the round tube is accidentally touched by the worker during the welding process, causing the position of the round tube to shift, thereby affecting the welding of the round tube.

[0021] (3) The present invention arranges an anti-gap device so that the elastic circular plate, the slide plate, the push plate, the groove rod, and the hinge rod cooperate to drive the trapezoidal plate to move in the direction of the elastic circular plate. The trapezoidal plate pushes the circular tube to move in the direction of the elastic circular plate, so that the trapezoidal plate pushes the two circular tubes to fit tightly together at the joint, thereby reducing the generation of gaps between the two circular tubes, thereby ensuring uniform contact between the welding surfaces of the circular tubes and facilitating the formation of a uniform and continuous weld. At the same time, the trapezoidal plate drives the rubber roller to contact the outer wall of the circular tube. When the circular tube rotates, the arrangement of the rubber roller at the trapezoidal plate ensures that the thrust applied by the trapezoidal plate will not affect the rotation of the circular tube, thereby ensuring that the rotation of the circular tube can be carried out effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the present invention as a whole;

[0023] Figure 2 A schematic diagram of a partial cross section of the present invention;

[0024] Figure 3 is a schematic diagram of the adaptation device of the present invention;

[0025] Figure 4 is a schematic diagram of a pressing device of the present invention;

[0026] Figure 5 It is a schematic cross-sectional view of a local structure of a pressing device of the present invention;

[0027] Figure 6 is a schematic diagram of the anti-gap device of the present invention;

[0028] Figure 7 It is a schematic diagram of the partial structure of the anti-gap device of the present invention.

[0029] In the figure: 1. processing table; 2. flexible bracket; 3. welding device body; 4. adaptation device; 41. hydraulic cylinder; 42. push plate; 43. slide plate; 44. elastic circular plate; 441. long mouth; 45. slide bar; 46. U-shaped frame; 47. thin plate; 5. pressing device; 51. elastic telescopic rod; 52. swivel; 53. round mouth plate; 54. circular frame; 55. T-shaped column; 56. serrated plate; 57. gear ring; 6. anti-gap device; 61. groove rod; 62. elastic telescopic column; 63. hinged rod; 64. trapezoidal plate; 65. rubber roller. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figure 1 - Figure 7 One embodiment of the present invention is: an aircraft landing gear welding device, comprising a processing table 1, a flexible bracket 2 is fixed on one side of the top of the processing table 1, a welding device body 3 is fixed on the end of the flexible bracket 2 away from the processing table 1, an adaption device 4 is fixed on the top of the processing table 1, the adaption device 4 comprises a push plate 42, an elastic return plate 44, a U-shaped frame 46, two hydraulic cylinders 41, two slide plates 43, two long openings 441, and two slide bars 45, the two hydraulic cylinders 41 are respectively fixed on both sides of the top of the processing table 1, and the telescopic ends of the two hydraulic cylinders 41 pass through the top of the processing table 1, the push plate 42 is fixed to the bottom of the telescopic ends of the two hydraulic cylinders 41, the two slide plates 43 are respectively slidably installed on both sides of the top of the push plate 42, the elastic return plate 44 is fixed between the tops of the two slide plates 43 close to each other, and the two long openings 441 are respectively opened at The front and rear sides of the elastic coiled plate 44, the two slide bars 45 are slidably installed on the top front and top rear sides of the elastic coiled plate 44, respectively, the U-shaped frame 46 is fixed between the tops of the two slide bars 45, and the two legs of the U-shaped frame 46 are slidably installed inside the long opening 441, and a through opening for the two slide plates 43 to slide is opened on the top of the processing table 1, and the welding device body 3 is fixed to the top of the U-shaped frame 46 by bolts. Through the setting of the above structure, the U-shaped frame 46 drives the welding device body 3 to weld the two round tubes at the joints, and the long opening 441 will limit the moving position of the welding device body 3 through the U-shaped frame 46, thereby ensuring that the distance between the welding device body 3 and the welds of the two round tubes is stable, thereby reducing the uneven welds or welding defects caused by the welding device body 3 being too close or too far from the welds of the two round tubes.

[0032] The adaptation device 4 includes a thin plate 47, which is fixed in the middle of the top surface of the push plate 42 and is located at the center of the processing table 1. Through the setting of the above structure, the thin plate 47 limits the end surface position of the two round tubes, thereby ensuring that the weld position of the two round tubes is directly below the welding device body 3.

[0033] A pressing device 5 is provided on the top of the push plate 42, and the pressing device 5 includes four elastic telescopic rods 51, and the four elastic telescopic rods 51 are respectively fixed on the front side and the rear side of the top of the push plate 42, and two of the four elastic telescopic rods 51 form a group, and a round-mouth plate 53 is fixed between the telescopic ends of two adjacent elastic telescopic rods 51, and a swivel 52 is rotatably installed inside the round mouth of the round-mouth plate 53. Through the arrangement of the above structure, the round-mouth plate 53 drives the swivel 52 to press the two round tubes on the processing table 1, so as to maintain the stability of the two round tubes during the welding process, ensure the consistency of the position and posture during the welding process, and thus improve the welding quality.

[0034] The pressing device 5 also includes a circular frame 54, four T-shaped columns 55, two sawtooth plates 56, and two toothed rings 57. The four T-shaped columns 55 are respectively fixed on the tops of the two circular plates 53. The circular frame 54 is slidably installed on the outside of the four T-shaped columns 55, and a spring is provided between the circular frame 54 and the T-shaped columns 55. The two sawtooth plates 56 are respectively fixed on the front side and the rear side of the bottom of the circular frame 54. The two toothed rings 57 are respectively fixed on the outside of the rotating rings 52 corresponding to the two circular plates 53. A plurality of tooth blocks are fixed on the outside of the toothed rings 57. The bottom of the sawtooth plate 56 is serrated. The serrations of the sawtooth plate 56 are in contact with the tooth blocks of the toothed rings 57. Through the above structure The setting makes the gear ring 57 no longer limit the position of the swivel 52. At this time, the worker can rotate the round tube to switch the welding position of the joint. During the rotation of the round tube, the round plate 53 will still drive the swivel 52 to press the round tube. This pressing can ensure that the contact surfaces of the two round tubes will not shift due to operation, thereby maintaining the alignment and consistency of the welded joints. When the serrated plate 56 limits the position of the gear ring 57, the gear ring 57 will limit the position of the swivel 52. At this time, the round tube cannot rotate, thereby avoiding the round tube being accidentally touched by the staff during the welding process, causing the position of the round tube to shift, thereby affecting the welding of the round tube.

[0035] When in use, the two round tubes that need to be welded of the landing gear are placed on the top front side and the top rear side of the processing table 1 respectively, and the ports of the two round tubes are in contact with each other. Then, the hydraulic cylinder 41 is started, and the telescopic end of the hydraulic cylinder 41 pushes the push plate 42 to move downward, and the push plate 42 drives the elastic back-shaped plate 44 to move downward through the slide plate 43. After the elastic back-shaped plate 44 contacts the outer wall of the round tube and continues to move downward, the elastic back-shaped plate 44 will stick to the arc surface of the round tube and bend and deform. The elastic back-shaped plate 44 drives the long mouth 441 to bend, and the elastic back-shaped plate 44 will drive the slide plate 43 to move toward the center of the push plate 42 during the bending deformation process. At this time, the welding device body 3 is started, and the U-shaped frame 46 is pushed to slide along the inside of the long mouth 441. At the same time, the U-shaped frame 46 drives the slide bar 45 to slide along the top of the elastic back-shaped plate 44. At this time, the U-shaped frame 46 drives the welding device body 3 to the two The butt joint of the circular tubes is welded, and the curved long mouth 441 will limit the moving position of the welding device body 3 through the U-shaped frame 46, so as to ensure that the distance between the welding device body 3 and the welds of the two circular tubes is stable, thereby reducing the uneven welds or welding defects caused by the welding device body 3 and the welds of the two circular tubes being too close or too far away. At the same time, since the elastic return plate 44 is an elastic structure, the elastic return plate 44 can adapt to the welding of landing gear circular tubes of different thicknesses; when the two circular tubes are placed on the processing table 1, the ends of the two circular tubes that are close to each other are attached to the thin plate 47, so that the thin plate 47 limits the end surface positions of the two circular tubes, thereby ensuring that the weld positions of the two circular tubes are directly below the welding device body 3, and when the push plate 42 moves downward, the push plate 42 drives the thin plate 47 to move downward, and at this time the thin plate 47 will be pulled out from between the two circular tubes.

[0036] At the same time, the two round tubes will pass through the round mouth of the round mouth plate 53, and the elastic telescopic rod 51 will be driven to move downward during the downward movement of the push plate 42, and the telescopic end of the elastic telescopic rod 51 will drive the round mouth plate 53 to move downward, and the round mouth plate 53 will drive the swivel 52 to press the two round tubes on the processing table 1, so as to maintain the stability of the two round tubes during the welding process, ensure the consistency of the position and posture during the welding process, and thus improve the welding quality; when the welding of the butt joint of one side of the two round tubes is completed, it is necessary to rotate the round tube to weld the other butt joints of the two round tubes, and push the circular frame 54 upward, and the circular frame 54 moves upward along the outside of the T-shaped column 55, and the circular frame 54 drives the sawtooth plate 56 to move upward, and the saw teeth of the sawtooth plate 56 are aligned with the teeth The tooth blocks of the ring 57 are separated. At this time, the serrated plate 56 does not limit the position of the toothed ring 57, and the toothed ring 57 no longer limits the position of the swivel 52. At this time, the worker can rotate the round tube to switch the welding position of the joint. During the rotation of the round tube, the round mouth plate 53 will still drive the swivel 52 to press the round tube. This pressing can ensure that the contact surfaces of the two round tubes will not shift due to operation, thereby maintaining the alignment and consistency of the welded joints. When the serrated plate 56 limits the position of the toothed ring 57, the toothed ring 57 will limit the position of the swivel 52. At this time, the round tube cannot rotate, thereby avoiding the round tube being accidentally touched by the staff during the welding process, causing the position of the round tube to shift, thereby affecting the welding of the round tube.

[0037] See also Figure 1 - Figure 7 On the basis of the above-mentioned embodiment, in another embodiment of the present invention, anti-gap devices 6 are provided on the top front side and the top rear side of the processing table 1.

[0038] The anti-gap device 6 includes two groove rods 61, two elastic telescopic columns 62, two hinged rods 63, and two trapezoidal plates 64. The two groove rods 61 are respectively slidably mounted on the side of the two slide plates 43 away from the center of the processing table 1, and the groove rods 61 are slidably mounted on the top of the processing table 1. The two elastic telescopic columns 62 are respectively slidably mounted on the side of the two groove rods 61 close to each other. The two trapezoidal plates 64 are respectively fixed on the side of the telescopic ends of the two elastic telescopic columns 62 close to each other. One end of the two hinged rods 63 is respectively hinged on the two groove rods 61. The other ends of the two hinged rods 63 are hinged on the outer wall of the two trapezoidal plates 64, which are away from the center of the processing table 1. Through the arrangement of the above structure, the groove rod 61 pushes the hinged rod 63 to drive the trapezoidal plate 64 to move toward the elastic round plate 44, and the trapezoidal plate 64 pushes the round tube to move toward the elastic round plate 44, so that the trapezoidal plate 64 pushes the two round tubes to fit tightly together at the joint, thereby reducing the gap between the two round tubes, thereby ensuring uniform contact between the welding surfaces of the round tubes, and helping to form a uniform and continuous weld.

[0039] It should be noted that the groove rod 61 is supported by the processing table 1, that is, the vertical height of the groove rod 61 does not change; when the elastic circular plate 44 bends, the slide plate 43 will slide downward, and the two groove rods 61 only approach each other but will not slide downward with the slide plate 43.

[0040] A rubber roller 65 is rotatably installed on one side of the two trapezoidal plates 64 that are close to each other, and the outside of the rubber roller 65 is provided with anti-slip grooves. Through the arrangement of the above structure, when the circular tube rotates, the arrangement of the rubber roller 65 at the trapezoidal plate 64 ensures that the thrust applied by the trapezoidal plate 64 will not affect the rotation of the circular tube, thereby ensuring that the rotation of the circular tube can be carried out effectively.

[0041] When in use, when the two round tubes are placed on the processing table 1, the round tubes are located between the two trapezoidal plates 64. When the elastic back-shaped plate 44 drives the slide plate 43 to move toward the center of the push plate 42 during the bending deformation process, the slide plate 43 drives the groove rod 61 to move toward the center of the push plate 42. The groove rod 61 pushes the hinge rod 63 to drive the trapezoidal plate 64 to move in the direction of the elastic back-shaped plate 44. The trapezoidal plate 64 pushes the round tube to move in the direction of the elastic back-shaped plate 44, so that the trapezoidal plate 64 pushes the two round tubes to fit tightly together at the joint, thereby reducing the generation of gaps between the two round tubes, thereby ensuring uniform contact between the welding surfaces of the round tubes, and helping to form a uniform and continuous weld; at the same time, the trapezoidal plate 64 drives the rubber roller 65 to contact the outer wall of the round tube. When the round tube rotates, the setting of the rubber roller 65 at the trapezoidal plate 64 ensures that the thrust applied by the trapezoidal plate 64 will not affect the rotation of the round tube, thereby ensuring that the rotation of the round tube can be carried out effectively.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An aircraft landing gear welding device, comprising a processing table (1), a flexible bracket (2) being fixed to one side of the top of the processing table (1), and a welding device body (3) being fixed to one end of the flexible bracket (2) away from the processing table (1); Features: An adapting device (4) is fixed on the top of the processing table (1), and the adapting device (4) comprises a push plate (42), an elastic return plate (44), a U-shaped frame (46), two hydraulic cylinders (41), two slide plates (43), two long openings (441), and two slide bars (45). The two hydraulic cylinders (41) are respectively fixed on both sides of the top of the processing table (1), and the telescopic ends of the two hydraulic cylinders (41) penetrate the top of the processing table (1). The push plate (42) is fixed on the bottom of the telescopic ends of the two hydraulic cylinders (41). The two slide plates (43) are respectively slidably mounted on both sides of the top of the push plate (42), the elastic return plate (44) is fixed between the tops of the two slide plates (43) on one side close to each other, the two long openings (441) are respectively opened on the front side and the rear side of the elastic return plate (44), the two slide bars (45) are respectively slidably mounted on the front side and the rear side of the top of the elastic return plate (44), the U-shaped frame (46) is fixed between the tops of the two slide bars (45), and the two legs of the U-shaped frame (46) are respectively slidably mounted inside the long openings (441); A through opening for two slide plates (43) to slide is provided on the top of the processing table (1), and the welding device body (3) is fixed to the top of the U-shaped frame (46) by means of bolts.

2. The aircraft landing gear welding device according to claim 1, characterized in that: The adapting device (4) comprises a thin plate (47), wherein the thin plate (47) is fixed to the middle of the top surface of the push plate (42), and the thin plate (47) is located at the center of the processing table (1).

3. The aircraft landing gear welding device according to claim 2, characterized in that: A pressing device (5) is provided at the top of the push plate (42), and the pressing device (5) comprises four elastic telescopic rods (51), and the four elastic telescopic rods (51) are respectively fixed to the front side and the rear side of the top of the push plate (42), and two of the four elastic telescopic rods (51) form a group, and a round-mouth plate (53) is fixed between the telescopic ends of the two elastic telescopic rods (51) located at the front side of the top, and another round-mouth plate (53) is fixed between the telescopic ends of the two elastic telescopic rods (51) located at the rear side of the top, and a swivel (52) is rotatably mounted inside the round mouth of the round-mouth plate (53).

4. The aircraft landing gear welding device according to claim 3, characterized in that: The pressing device (5) further comprises a circular frame (54), four T-shaped columns (55), two sawtooth plates (56), and two toothed rings (57). The four T-shaped columns (55) are respectively fixed on the tops of the two round-mouth plates (53). The circular frame (54) is slidably mounted on the outside of the four T-shaped columns (55), and a spring is provided between the circular frame (54) and the T-shaped columns (55). The two sawtooth plates (56) are respectively fixed on the front side and the rear side of the bottom of the circular frame (54). The two toothed rings (57) are respectively fixed on the outside of the rotating rings (52) corresponding to the two round-mouth plates (53).

5. The aircraft landing gear welding device according to claim 4, characterized in that: A plurality of tooth blocks are fixed to the outside of the gear ring (57), the bottom of the sawtooth plate (56) is arranged in a sawtooth shape, and the sawtooth shape of the sawtooth plate (56) is in contact with the tooth blocks of the gear ring (57).

6. The aircraft landing gear welding device according to claim 5, characterized in that: The top front side and the top rear side of the processing table (1) are both provided with an anti-gap device (6), the anti-gap device (6) comprising two groove rods (61), two elastic telescopic columns (62), two hinged rods (63), and two trapezoidal plates (64), the two groove rods (61) being respectively slidably mounted vertically on the side of the two slide plates (43) away from the center of the processing table (1), and the groove rods (61) being slidably mounted horizontally on the top of the processing table (1), the two elastic telescopic columns (62) being respectively slidably mounted on the side of the two groove rods (61) close to each other, the two trapezoidal plates (64) being respectively fixed on the side of the telescopic ends of the two elastic telescopic columns (62) close to each other, one end of the two hinged rods (63) being respectively hinged on the outer wall of the two groove rods (61), and the other end of the two hinged rods (63) being respectively hinged on the side of the two trapezoidal plates (64) away from the center of the processing table (1).

7. The aircraft landing gear welding device according to claim 6, characterized in that: A rubber roller (65) is rotatably mounted on one side of the two trapezoidal plates (64) that are close to each other, and the outside of the rubber roller (65) is provided with anti-slip grooves.

8. A method for using an aircraft landing gear welding device, comprising an aircraft landing gear welding device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, placing two round tubes to be welded for the landing gear on the top front side and the top rear side of the processing table (1) respectively, and making the ends of the two round tubes contact each other; S2, then, the hydraulic cylinder (41) is started, and the telescopic end of the hydraulic cylinder (41) pushes the push plate (42) to move downward, and the push plate (42) drives the elastic circular plate (44) to move downward through the slide plate (43); S3, after the elastic return plate (44) contacts the outer wall of the circular tube and continues to move downward, the elastic return plate (44) will stick to the curved surface of the circular tube and bend and deform, the elastic return plate (44) drives the long opening (441) to bend, and the elastic return plate (44) will drive the slide plate (43) to move toward the center of the push plate (42) during the bending and deformation process; S4, at this time, the welding device body (3) is started, and the U-shaped frame (46) is pushed to slide along the inside of the long opening (441), and at the same time, the U-shaped frame (46) drives the slide bar (45) to slide along the top of the elastic circular plate (44); S5. At this time, the U-shaped frame (46) drives the welding device body (3) to weld the butted parts of the two round tubes.

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