Assembly welding method of aero-engine hydraulic actuating device

Abstract

The invention discloses an assembling and welding method for a hydraulic actuating device of an aero-engine, which is characterized in that pipes correspondingly mounted on different actuating cylinders are not completely the same, so that the welding and assembling sequence of the pipes is improved according to the actual mounting positions of the pipes on the device and the limitation of the mounting space of the different pipes; when the third pipeline, the fourth pipeline and the valve are welded, the problems of shielding and interference of the welding positions are avoided, and the situation that the assembling difficulty is increased due to the unreasonable assembling sequence is avoided; after positioning is completed, the third pipeline, the fourth pipeline and the valve are detached from the corresponding actuating cylinders to be welded, the accuracy of the welding position can be guaranteed, the convenience of welding operation is also facilitated, the one-time welding qualification rate is increased, and after the third pipeline, the fourth pipeline and the valve are welded, the welding efficiency is improved. And then the third pipeline, the fourth pipeline and the valve are welded to the actuator cylinder, and shielding of the welding positions is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine tooling, and relates to an assembly welding method for a hydraulic actuating device of an aero-engine. Background Art

[0002] For a certain aircraft hydraulic actuating system, refer to Figure 1 , which is formed by welding and connecting an actuating cylinder 1, a lifting hook 2, a pin 3, a first pipe 4, a second pipe 5, a third pipe 6, a fourth pipe 7, a first hinge 8, a second hinge 9 and a valve 10 by argon arc welding. The materials of the welding parts are all titanium alloy, and there are 52 argon arc welding circumferential welds in total.

[0003] Assembly and welding on the component actuating cylinder 1: There are 9 each of the first pipe 4 and the second pipe 5, 2 each of the third pipe 6 and the fourth pipe 7, and 1 each of the first hinge 8 and the second hinge 9. The pipes are staggered with each other and the structure is complex. Therefore, some positions at the butt welding joints of the pipe joints are interfered and blocked, and the welding difficulty is extremely high; the materials of the welding positions of the parts are all titanium alloy, and the welding is easy to oxidize, and the back of the welding position cannot be protected, so welding needs to be carried out in a vacuum argon filling box. The welding position and the operating space are limited, resulting in poor welding accessibility.

[0004] If the assembly and welding sequence of the components is not designed reasonably, it may lead to: some welds are interfered and blocked, and the weld bead deviates during the welding process, resulting in lack of fusion; some joints are difficult to assemble; some welding parts are prone to welding defects such as pores and cracks during welding due to insufficient cleaning of interference. The unreasonable assembly and welding sequence causes the pollution of the joints after pickling, affecting the welding qualification rate. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that the pipes of the aero-engine hydraulic actuating system are staggered with each other and the structure is complex, some positions at the butt welding joints of the pipe joints are interfered and blocked, the welding difficulty is large, the welding position and the operating space are limited, resulting in poor welding accessibility, the unreasonable installation and welding sequence leads to welding defects such as pores and cracks in the assembled workpiece, and the unreasonable assembly and welding sequence causes the pollution of the joints after pickling, affecting the welding qualification rate. The present invention provides an assembly welding method for a hydraulic actuating device of an aero-engine, which avoids the increase in assembly difficulty caused by unreasonable assembly sequence; avoids the pollution of the joints after pickling and the insufficient cleaning caused by multiple assembly weldings, resulting in welding defects, improves the first-pass welding qualification rate, reduces the number of weld repairs, effectively improves the processing efficiency, and shortens the processing cycle.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An assembly welding method for a hydraulic actuating device of an aero-engine includes the following steps:

[0008] Step 1: Connect all the actuators end to end to form a complete circle;

[0009] Step 2:

[0010] Assemble and weld the first pipe on a part of the actuators, and assemble and weld the second pipe on the actuators that need to assemble the first hinge among the remaining actuators;

[0011] Step 3:

[0012] Among the actuators already welded with the first pipe, select a part to assemble and weld the second pipe, and the other part to assemble and weld the second hinge;

[0013] Assemble and weld the first hinge on the actuators that need to assemble and weld the first hinge;

[0014] Step 4:

[0015] After the welding based on the steps is completed, assemble the third pipe, the fourth pipe and the valve on the remaining actuators, and position the welding positions of the third pipe, the fourth pipe and the valve to obtain the welding positions;

[0016] Disassemble the third pipe, the fourth pipe and the valve from the actuators, and weld the third pipe, the fourth pipe and the valve according to the welding positions;

[0017] After the welding is completed, reassemble and weld the third pipe, the fourth pipe and the valve to the corresponding actuators to complete the welding.

[0018] A further improvement of the present invention lies in:

[0019] The said Step 4 further includes:

[0020] After the welding based on Step 3 is completed, split the complete circle structure into two semi-circle structures, and detect the welded parts on the two semi-circles;

[0021] After the detection is qualified, assemble the two semi-circle structures, and the workpiece is restored to a complete circle structure;

[0022] Assemble the third pipe, the fourth pipe and the valve on the actuators without installed pipe fittings, and pre-position the welding positions of the third pipe, the fourth pipe and the valve.

[0023] In Step 4, the welding of the third pipe, the fourth pipe and the valve according to the welding positions includes:

[0024] After the welding positions of the third pipe, the fourth pipe and the valve are positioned, disassemble the third pipe, the fourth pipe and the valve from the corresponding actuators;

[0025] According to the positioned welding positions, weld one end of the valve to the end of the third pipe and the other end to the end of the fourth pipe.

[0026] In step 4, after the welding is completed, the third pipe, the fourth pipe and the valve are welded to the corresponding actuator, including:

[0027] Assemble the already welded third pipe, fourth pipe and valve on the corresponding actuator;

[0028] Weld the end of the third pipe far from the valve to the actuator;

[0029] Weld the end of the fourth pipe far from the valve to the actuator.

[0030] In step 1, it also includes connecting all the actuators to the welding fixture through hooks.

[0031] The hook is fixed to the corresponding actuator through a pin.

[0032] In step 1, all the actuators are connected end to end through pins.

[0033] In step 1, the number of all the actuators is twelve;

[0034] In step 2:

[0035] Weld the first pipe to nine actuators in sequence, and weld the second pipe to one actuator;

[0036] In step 3:

[0037] Based on the nine actuators already welded with the first pipe, weld the second pipe to eight of them and weld the second hinge to one actuator;

[0038] Weld the first hinge to the one actuator only welded with the second pipe;

[0039] In step 4, after the welding in step 3 is completed, weld the third pipe, the fourth pipe and the valve to the remaining two actuators.

[0040] It also includes cleaning the parts to be welded before assembly and welding.

[0041] An aero-engine hydraulic actuator is welded by the welding method according to any one of the present invention.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention discloses an assembly and welding method for a hydraulic actuating device of an aeroengine. Since the pipes correspondingly installed on different actuating cylinders are not completely the same, according to the actual installation positions of the pipes on the device and the limitations of the installation spaces of different pipes, the welding and assembly sequence of each pipe is improved to avoid problems of welding part occlusion and interference, and to avoid an increase in assembly difficulty caused by unreasonable assembly sequence. At the same time, when welding the third pipe, the fourth pipe and the valve, the welding positions of the third pipe, the fourth pipe and the valve are positioned first. After positioning is completed, the third pipe, the fourth pipe and the valve are disassembled from the corresponding actuating cylinder for welding. This can not only ensure the accuracy of the welding position, but also facilitate the convenience of welding operation, improve the qualified rate of the first welding, and after welding the third pipe, the fourth pipe and the valve, the third pipe, the fourth pipe and the valve are welded to the actuating cylinder to avoid occlusion of the welding part. This method avoids welding defects caused by joint pollution and incomplete cleaning after pickling, improves the qualified rate of the first welding, reduces the number of weld repair times, effectively improves the processing efficiency, and shortens the processing cycle; a reasonable assembly and welding sequence.

[0044] Further, in the present invention, after the welding based on the steps is completed, the actuating cylinder with the remaining unfitted pipe fittings is disassembled from the whole circle, and the whole circle structure becomes two semi-circle structures, and the welding parts on the two semi-circles are detected, overcoming the defects of limited detection space inside the whole circle and inconvenient detection.

[0045] The present invention discloses a hydraulic actuating device of an aeroengine, which is welded by a reasonable assembly and welding sequence, avoiding welding defects caused by joint pollution and incomplete cleaning after pickling, improving the qualified rate of the first welding, reducing the number of weld repair times, and improving the product qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a structural diagram of the hydraulic actuating device of the aeroengine of the present invention;

[0048] Wherein: 1 - actuating cylinder; 2 - lifting hook; 3 - pin; 4 - first pipe; 5 - second pipe; 6 - third pipe; 7 - fourth pipe; 8 - first hinge; 9 - second hinge; 10 - valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0050] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0051] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further definition and explanation thereof is not required in subsequent figures.

[0052] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0053] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0054] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The present invention will be further described in detail below with reference to the accompanying drawings:

[0056] SeeFigure 1 , an embodiment of the present invention discloses a hydraulic actuator device for an aeroengine and a welding method. By designing a reasonable assembly and welding sequence, the processing of components is realized, ensuring the smooth completion of assembly and welding of components and meeting the requirements of the drawings.

[0057] The object of the present invention is achieved through the disclosed technical solution:

[0058] There are a total of 52 argon arc weld circumferential welds on the hydraulic actuator system, including 48 on 12 actuators 1 and 4 on the valve 10. In order to solve the problems of weld interference, occlusion, and contamination of welding joints and ensure the cleanliness requirements, the first pipe 4, the second pipe 5, the third pipe 6, the fourth pipe 7, the first hinge 8, the second hinge 9, and the valve 10 are assembled and welded in four times, including:

[0059] (1) First, assemble all 9 first pipes 4 on the actuator 1, then assemble 1 second pipe 5 on the actuator 1 (the actuator connected to the first hinge 8), and then perform argon arc welding on 20 joints;

[0060] (2) Assemble the remaining 8 second pipes 5 onto the actuator 1, then assemble the first hinge 8 and the second hinge 9 onto the actuator 1, and perform argon arc welding on 20 joints;

[0061] (3) Assemble the third pipe 6, the fourth pipe 7, and the valve 10 onto the actuator 1, and perform argon arc welding positioning on the joints (4 places) at both ends of the valve 10. Then remove the valve 10 connected to the third pipe 6 and the fourth pipe 7 from the actuator 1, and perform argon arc welding on the joints at both ends of the valve 10, a total of 4 places;

[0062] (4) Assemble the third pipe 6 and the fourth pipe 7 connected to the valve 10 onto the actuator 1, and perform argon arc welding on 8 joints.

[0063] An assembly and welding sequence of a hydraulic actuator system for a complex-structured aeroengine disclosed in this embodiment uses this method to solve the problems that the welding parts are occluded and interfered due to the complex structure of the components and the intersection of pipes, affecting welding; avoid the increase in assembly difficulty caused by unreasonable assembly sequence; avoid the contamination of joints after pickling and the incomplete cleaning caused by multiple assembly and welding, resulting in welding defects, improve the qualified rate of one-time welding, reduce the number of weld repair times, effectively improve the processing efficiency, and shorten the processing cycle; at the same time, control the turnover times of components and ensure the cleanliness requirements of the drawings.

[0064] Specifically, it includes:

[0065] An embodiment of the present invention discloses a hydraulic actuator device for an aeroengine and a welding method, characterized in that it includes the following steps:

[0066] Step 1:

[0067] Connect all the actuators 1 end to end to form a complete circle.

[0068] Furthermore, this step specifically further includes:

[0069] Assemble the hook 2 to the welding fixture, and connect each actuator 1 to the hook 2 through a pin 3;

[0070] Before welding, clean the joint positions of the parts to be welded.

[0071] Step 2:

[0072] Step 2.1: Assemble and weld the first pipe 4 on a part of the actuators 1, and assemble and weld the second pipe 5 on the actuators 1 that need to assemble the first hinge 8 among the remaining actuators 1;

[0073] After welding is completed, divide the actuators 1 with the first pipe 4 welded into two parts, weld the second pipe 5 on one part and weld the second hinge 9 on the other part;

[0074] Step 3:

[0075] Among the actuators 1 with the first pipe 4 welded, select a part to assemble and weld the second pipe 5, and assemble and weld the second hinge 9 on the other part;

[0076] Assemble and weld the first hinge 8 on the actuators 1 that need to assemble and weld the first hinge 8;

[0077] After welding in this step, inspect the welded components, including:

[0078] Disassemble the circular structure into two semi-circular structures, and inspect the welded parts on the two semi-circles. Specifically, send rays to inspect whether the welded joints are qualified.

[0079] In this step, the circular structure is changed into two semi-circular structures, and the welded parts on the two semi-circles are inspected, overcoming the defects of limited internal inspection space and inconvenient inspection inside the complete circle.

[0080] After the inspection is completed, restore the whole workpiece into a complete circle, which is convenient for the accuracy of positioning the welding positions of the third pipe 6, the fourth pipe 7 and the valve 10 in the later stage.

[0081] Step 3:

[0082] The welding object in this step is the remaining actuators 1 except for the actuators 1 with pipe fittings welded based on Step 2, and the third pipe 6, the fourth pipe 7 and the valve 10 are welded on the remaining actuators 1 at the same time. Specifically:

[0083] Step 3.1: After the welding in Step 2 is completed, assemble the third pipe 6, the fourth pipe 7 and the valve 10 on the remaining actuator 1, and position the welding positions of the third pipe 6, the fourth pipe 7 and the valve 10 to obtain the welding positions.

[0084] Step 3.2: Disassemble the third pipe 6, the fourth pipe 7 and the valve 10 from the actuator 1, and weld the third pipe 6, the fourth pipe 7 and the valve 10 according to the welding positions.

[0085] The specific welding is as follows:

[0086] According to the located welding positions, weld one end of the valve 10 to the end of the third pipe 6 and the other end to the end of the fourth pipe 7.

[0087] Step 3.3: After the welding is completed, assemble and weld the third pipe 6, the fourth pipe 7 and the valve 10 to the corresponding actuator 1 to complete the welding.

[0088] Specifically:

[0089] Weld the end of the third pipe 6 away from the valve 10 to the actuator 1.

[0090] Weld the end of the fourth pipe 7 away from the valve 10 to the actuator 1.

[0091] Since the pipes installed correspondingly on different actuators are not completely the same, the welding and assembly sequence of each pipe is improved according to the actual installation positions of the pipes on the device and the limitations of the installation spaces of different pipes, avoiding problems of welding part occlusion and interference, and avoiding the increase in assembly difficulty caused by unreasonable assembly sequence. At the same time, when welding the third pipe, the fourth pipe and the valve, first position the welding positions of the third pipe, the fourth pipe and the valve. After the positioning is completed, disassemble the third pipe, the fourth pipe and the valve from the corresponding actuator for welding. This can not only ensure the accuracy of the welding positions, but also facilitate the convenience of welding operations, improve the qualified rate of the first welding, and after welding the third pipe, the fourth pipe and the valve, weld the third pipe, the fourth pipe and the valve to the actuator to avoid the occlusion of the welding parts. This method avoids welding defects caused by joint pollution and insufficient cleaning after pickling, improves the qualified rate of the first welding, reduces the number of weld repair times, effectively improves the processing efficiency, shortens the processing cycle, and has a reasonable assembly and welding sequence.

[0092] Specifically, this embodiment also discloses a specific embodiment. The assembly and welding object of this embodiment is applied to a hydraulic actuator system of a certain aero-engine. The entire workpiece includes 12 actuators 1. The specific welding and assembly steps include:

[0093] Step 1: Clean the joints of 10 initially to-be-welded actuators 1, 9 first pipes 4 and 1 second pipe 5.

[0094] Step 2: Assemble 12 hooks 2 to the welding fixture.

[0095] Step 3: Connect 12 actuators 1 and 12 hooks 2 with 24 pins 3.

[0096] Step 4:

[0097] Step 4.1: Assemble the 9 cleaned first pipes 4 in Step 1 to the corresponding actuators 1 respectively. (In this step, 9 out of the 10 actuators 1 in Step 1 are selected and welded with the first pipes 4 respectively);

[0098] Step 4.2: Then assemble 1 second pipe 5 to the corresponding actuator 1; (The object of this step is the remaining 1 actuator 1 after removing the 9 actuators 1 that have been installed with the first pipes 4, and this remaining 1 actuator 1 needs to be connected with the first hinge 8 in the follow-up).

[0099] Step 5: Position the 20 joints to be welded by argon arc welding.

[0100] Step 6: Load the assembly into the argon-filled box and weld the 20 joints by argon arc welding.

[0101] Step 7: After all the pipe joints are welded, open the hatch of the argon-filled box and take out the assembly.

[0102] Step 8:

[0103] Assemble the 8 cleaned second pipes 5, 1 first hinge 8, and 1 second hinge 9 to the corresponding actuators 1, specifically:

[0104] Assemble the 8 second pipes 5 to the 8 actuators 1 that have been assembled with the first pipes 4 in Step 4.1, and assemble 1 second hinge 9 to the remaining 1 actuator 1.

[0105] Step 9: Position the 20 joints by argon arc welding.

[0106] Step 10: Load the assembly into the argon-filled box again and weld the 20 joints by argon arc welding.

[0107] Step 11: After all the pipe joints are welded, open the hatch of the argon-filled box, remove the assembly and send the 20 welded joints for radiographic inspection.

[0108] In this step, the whole part needs to be disassembled into two semi-circular structures and the two semi-circular structures are sent for radiographic inspection.

[0109] Step 12: After the radiographic inspection is qualified, install the assembly on the welding fixture.

[0110] Step 13: Clean the joints of the remaining two actuator 1 cylinder bodies with the third pipe 6, the fourth pipe 7, and the valve 10, and assemble the remaining two actuators 1 together with the actuators 1 already welded with pipes again.

[0111] Step 14: Assemble the third pipe 6, the fourth pipe 7, and the valve 10 onto the corresponding actuator 1.

[0112] Step 15: Only perform argon arc welding positioning on the joints at both ends of the valve 10 (4 places).

[0113] Step 16: Remove the two groups of the third pipe 6 and the fourth pipe 7 connected with the valve 10 from the actuator 1.

[0114] Step 17: Put the two groups of the valve 10 connected with the third pipe 6 and the fourth pipe 7 into the argon filling box and perform welding inside the argon filling box, a total of four places.

[0115] Specifically: Weld one end of the valve 10 to the end of the third pipe 6, and the other end to the end of the fourth pipe 7.

[0116] Step 18: After all the pipe joints are welded, open the hatch of the argon filling box and take out the two groups of the third pipe 6 and the fourth pipe 7 connected with the valve 10.

[0117] Step 19: Clean the remaining joints of the two groups of the third pipe 6 and the fourth pipe 7 and the joints of the corresponding two actuators 1.

[0118] Step 20: Assemble the two groups of the third pipe 6 and the fourth pipe 7 connected with the valve 10 onto the corresponding actuator 1.

[0119] Step 21: Perform argon arc welding positioning on the 8 joints where the third pipe 6 and the fourth pipe 7 are connected to the actuator 1.

[0120] Step 22: Put the assembly into the argon filling box and perform argon arc welding on the 8 joints.

[0121] Specifically:

[0122] Weld the end of the third pipe 6 far from the valve 10 to the actuator 1;

[0123] Weld the end of the fourth pipe 7 far from the valve 10 to the actuator 1.

[0124] Step 23: After all the pipe joints are welded, open the hatch of the argon filling box, remove the assembly and send the 12 welded joints for radiographic inspection.

[0125] The advantages of this invention are as follows: By designing a reasonable assembly and welding sequence, this invention solves the problems of welding part occlusion and interference caused by the complex component structure and the interlacing of tubes; it avoids the increase in assembly difficulty caused by an unreasonable assembly sequence; at the same time, it avoids welding defects caused by joint contamination after pickling and inadequate cleaning, improves the qualified rate of the first welding, reduces the number of weld seam repair welds, effectively improves the processing efficiency, and shortens the processing cycle; the reasonable assembly and welding sequence controls the turnover times of components and ensures the cleanliness requirements specified in the drawings.

[0126] This invention also discloses an aeroengine hydraulic actuator, which is obtained by welding according to the welding method disclosed in this embodiment.

[0127] It is welded by a reasonable assembly and welding sequence, avoiding welding defects caused by joint contamination after pickling and inadequate cleaning, improving the qualified rate of the first welding, reducing the number of weld seam repair welds, and improving the product qualified rate.

[0128] The above are only the preferred embodiments of this invention and are not used to limit this invention. For those skilled in the art, this invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this invention shall be included within the protection scope of this invention.

Claims

1. An assembly and welding method for a hydraulic actuator of an aeroengine, characterized in that, It includes the following steps: Step 1: Connect all the actuators (1) end to end to form a complete circle; Step 2: Assemble and weld the first pipe (4) on a part of the actuators (1), and assemble and weld the second pipe (5) on the actuators (1) that need to assemble the first hinge (8) among the remaining actuators (1); Step 3: Among the actuators (1) where the first pipe (4) has been welded, select a part to assemble and weld the second pipe (5), and the other part to assemble and weld the second hinge (9); Assemble and weld the first hinge (8) on the actuators (1) that need to assemble and weld the first hinge (8); Step 4: After the welding in Step 3 is completed, assemble the third pipe (6), the fourth pipe (7) and the valve (10) on the remaining actuators (1), and position the welding positions of the third pipe (6), the fourth pipe (7) and the valve (10) to obtain the welding positions; Disassemble the third pipe (6), the fourth pipe (7) and the valve (10) from the actuators (1), and weld the third pipe (6), the fourth pipe (7) and the valve (10) according to the welding positions; After the welding is completed, assemble and weld the third pipe (6), the fourth pipe (7) and the valve (10) to the corresponding actuators (1) again to complete the welding.

2. The assembly and welding method of a hydraulic actuator for an aeroengine according to claim 1, characterized in that, Step 4 further includes: After the welding in Step 3 is completed, split the circular structure into two semi-circular structures, and detect the welded parts on the two semi-circles; After passing the detection, assemble the two semi-circular structures, and the workpiece is restored to a complete circular structure; Assemble the third pipe (6), the fourth pipe (7) and the valve (10) on the actuators (1) where the pipe fittings are not installed, and pre-position the welding positions of the third pipe (6), the fourth pipe (7) and the valve (10).

3. The assembly and welding method of a hydraulic actuator for an aeroengine according to claim 2, characterized in that In Step 4, the welding of the third pipe (6), the fourth pipe (7) and the valve (10) according to the welding positions includes: After the welding positions of the third pipe (6), the fourth pipe (7) and the valve (10) are positioned, disassemble the third pipe (6), the fourth pipe (7) and the valve (10) from the corresponding actuators (1); According to the positioned welding positions, weld one end of the valve (10) to the end of the third pipe (6) and the other end to the end of the fourth pipe (7).

4. The assembly and welding method of a hydraulic actuator for an aeroengine according to claim 3, characterized in that, In Step 4, the welding of the third pipe (6), the fourth pipe (7) and the valve (10) to the corresponding actuators (1) again after the welding is completed includes: Assemble the welded third pipe (6), the fourth pipe (7) and the valve (10) on the corresponding actuators (1); Weld the end of the third pipe (6) far from the valve (10) to the actuator (1); Weld the end of the fourth pipe (7) far from the valve (10) to the actuator (1).

5. The assembly and welding method of a hydraulic actuator for an aero-engine according to claim 1, characterized in that, In Step 1, it also includes connecting all the actuators (1) to the welding fixture through the lifting hooks (2).

6. The assembly and welding method of a hydraulic actuator for an aeroengine according to claim 5, characterized in that, The lifting hook (2) is fixed on the corresponding actuator (1) through the pin (3).

7. The assembly welding method of a hydraulic actuator for an aeroengine according to claim 1, characterized in that, In Step 1, all the actuators (1) are connected end to end through the pins (3).

8. The assembling and welding method of a hydraulic actuator for an aeroengine according to claim 1, characterized in that In Step 1, the number of all the actuators (1) is twelve; In Step 2: Weld the first pipe (4) on nine actuators (1) in sequence, and weld the second pipe (5) on one actuator (1); In step 3: Based on nine actuators (1) to which the first pipe (4) has been welded, the second pipe (5) is welded to eight of the actuators (1), and the second hinge (9) is welded to one actuator (1); The first hinge (8) is welded to one actuator (1) to which only the second pipe (5) is welded; In step 4, after the welding in step 3 is completed, the third pipe (6), the fourth pipe (7) and the valve (10) are welded to the remaining two actuators (1).

9. The assembly and welding method of a hydraulic actuator for an aeroengine according to claim 1, characterized in that It also includes cleaning the parts to be welded before assembly welding.

10. An aeroengine hydraulic actuation device, characterized in that, Obtained by welding according to the welding method described in any one of claims 1-9.

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