A fixture for argon arc welding of aircraft engine mixer lobe components

Abstract

The present invention proposes a fixture for argon arc welding of aircraft engine mixer lobe components, which belongs to the field of aerospace technology. The problem of deformation in the process of assembling and controlling the welding of the spatial curved surface of the aircraft engine mixer lobe components is solved. It includes a large disc, a clamping and positioning mechanism, an arc positioning component, a cylinder mechanism, a lifting disc mechanism and a top circle positioning mechanism. The large disc is evenly provided with a plurality of workpiece assembly positions along the circumferential direction, and a clamping and positioning mechanism is installed on each workpiece assembly position. The clamping and positioning mechanism includes a fixed end and a movable end. The fixed end is fixedly connected to the large disc, and the movable end includes a clamping plate, a positioning block and a clamping block. The number of the clamping plates is two and both have an arc. The two clamping plates are connected to the positioning block, and the fixed end is connected to the positioning block through a radial moving device. It is mainly used for automatic argon arc welding of aircraft engine mixer lobe components.

Description

Technical Field

[0001] The invention belongs to the field of aerospace technology, and in particular relates to a tooling fixture for argon arc welding of a mixer lobe assembly of an aero-engine. Background Art

[0002] Aircraft engines are highly complex and sophisticated thermal machines that provide the power required for aircraft to fly. As the heart of an aircraft, they are known as the "flower of industry". They directly affect the performance, reliability and economy of an aircraft and are an important manifestation of a country's scientific, industrial and national defense strength.

[0003] The finished product of the aircraft engine mixer lobe assembly is welded together by 24 curved surface pieces, each of which is a 1.2mm thick titanium alloy special stamping part. Figure 11-12 As shown, the finished workpiece after welding is as follows Fig.13 As shown in the figure, due to its complex and irregular curved surface shape, it is difficult to assemble, the welding quality is difficult to guarantee, and the welding deformation is difficult to control. At present, the automated assembly and welding of the mixer lobes of domestic aircraft engines are still blank. Most of them are manually assembled and welded. Manual correction is required after welding, and the weld formation and the size of the parts after welding cannot be guaranteed. In addition, the dimensional consistency of these special materials after stamping is poor, the manual assembly accuracy is poor, the welding quality qualification rate is low, and the amount of rework is large. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides a tooling fixture for argon arc welding of a mixer lobe assembly of an aircraft engine.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a tooling fixture for argon arc welding of aero-engine mixer lobe components, which includes a large disc, a clamping and positioning mechanism, an arc positioning component, a cylinder mechanism, a lifting disc mechanism and a top circle positioning mechanism. The large disc is evenly provided with a plurality of workpiece assembly positions along the circumferential direction, and a clamping and positioning mechanism is installed on each workpiece assembly position. The clamping and positioning mechanism includes a fixed end and a movable end, and the fixed end is fixedly connected to the large disc, and the movable end includes a clamping plate and a positioning block. The number of the clamping plates is two and both have an arc, and the two clamping plates are connected to the positioning block. The fixed end is connected to the positioning block through a radial moving device, and the movable end is driven to move radially along the large disc by the radial moving device. The positioning block cooperates with the clamping block through bolts to clamp the large disc. The cylindrical mechanism is installed on the large disc, and the cylindrical mechanism is evenly provided with a plurality of guide grooves along the circumferential direction. The guide grooves are the same in number and position as the workpiece assembly positions, and an arc positioning component is arranged at each guide groove. The front end of the arc positioning component is an arc structure, and the rear end is provided with a tapered guide block, and the lower end is bolted and cooperates with the clamping block to clamp the large disc. The rear end of the arc positioning component is connected to the cylindrical mechanism through a tension spring mechanism, and the arc positioning component can slide radially along the large disc. The bottom of the lifting disc mechanism is a tapered structure, and the tapered structure cooperates and contacts with the tapered guide block at the rear end of the arc positioning component. The lifting disc mechanism is connected to the large disc through an axial moving device, and the lifting disc mechanism is driven to move axially along the cylindrical mechanism through the axial moving device. The top circle positioning mechanism is concentrically fixedly installed above the cylindrical mechanism.

[0006] Furthermore, the fixture also includes a discharging mechanism, and the number of the discharging mechanisms is multiple, and the multiple discharging mechanisms are evenly installed on the bottom of the large disc.

[0007] Furthermore, the unloading mechanism is a cylinder structure.

[0008] Furthermore, the arc structure at the front end of the arc positioning component is made of copper, and has multiple rows of circular holes on the arc structure. A flow channel is provided inside, and a gas pipeline is provided at the rear. Protective gas is input into the gas pipeline, and the protective gas flows out from the multiple rows of circular holes through the flow channel.

[0009] Furthermore, the tooling fixture also includes an automatic control valve assembly, which includes a protective gas valve and a compressed air valve. The protective gas valve is connected to the gas pipeline to control the output of the protective gas, and the compressed air valve is connected to the cylinder to control the extension and retraction of the cylinder rod of the cylinder.

[0010] Furthermore, the radial moving device includes a lead screw, a polished rod, a nut and a linear bearing, the lead screw and the polished rod are installed on the fixed end, the nut and the linear bearing are installed on the positioning block, the nut is connected to the lead screw, and the linear bearing is connected to the polished rod.

[0011] Furthermore, the axial moving device includes a screw and a nut, the screw is fixedly installed on the lifting disk mechanism, the nut is fixedly installed at the center of the large disk, and the screw on the lifting disk mechanism is connected with the nut on the large disk.

[0012] Furthermore, the tooling fixture also includes a lifting plate locking mechanism and a guide mechanism. The number of the lifting plate locking mechanisms is two, and the two lifting plate locking mechanisms are evenly installed on the large disc and are fastened to the lifting plate mechanism by bolts to achieve the locking of the lifting plate mechanism. The guide mechanism is an inner and outer sleeve structure, the outer sleeve is fixed on the large disc, and the inner sleeve is fixed on the lifting plate mechanism, the outer sleeve and the inner sleeve are matched and connected, and a limited position structure is provided on the guide mechanism.

[0013] Furthermore, the fixture also includes a conversion scale, which is respectively arranged on the inner side of the cylinder mechanism and the lifting plate mechanism.

[0014] Furthermore, the large disc is concentrically mounted above the fixture base, and the fixture base is mounted on the positioner turntable.

[0015] Compared with the prior art, the invention has the following beneficial effects: the invention solves the deformation problem in the process of assembling and controlling the welding of the space curved surface of the mixer lobe assembly of the aircraft engine. It can realize automatic welding, and continuously weld multiple curved welds in one clamping, achieving a technological breakthrough in this field. Through the formulation of process parameters and the compilation of robot welding programs, the automatic argon arc welding of parts is completed, and the size and surface quality of the parts after welding should meet the process requirements. It can realize mass production.

[0016] The fixture of the present invention not only saves processes and greatly improves efficiency from assembly to welding to finished products, but also greatly improves the quality of products, significantly reduces energy consumption during welding, is easy to operate, and can be operated with one button. In terms of process saving, manual assembly and no positioning were used before, and the outer diameter of the product and the inner and outer cavity dimensions of each petal were difficult to guarantee. Manual calibration was required after each welding. The present invention avoids many manual intervention links. In terms of efficiency improvement, the manual calibration link is omitted, the welding process is automated, the on and off of the shielding gas and the rotation change of the welding position are completed by coordination with the robot, and the unloading cylinder after welding pushes the workpiece out to realize automatic unloading, which greatly improves its efficiency. After the post-welding inspection, it was found that the appearance and size of the product met the requirements of the drawings, and the weld seam X-ray inspection was a first-level film. The quality of the product was also improved, and during the welding process, the on and off of the shielding gas and compressed air were controlled in real time, which not only saved energy, but also reduced the links of manual operation. The assembled product can be operated with one button, and the personnel are reduced, saving costs. The yield rate has been greatly improved, which has saved a lot of costs and solved the previous problems of manual assembly, manual welding and high scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a fixture for argon arc welding of a mixer lobe assembly of an aircraft engine according to the present invention;

[0018] Figure 2 It is a schematic diagram of the exploded structure of a fixture for argon arc welding of a mixer lobe assembly of an aircraft engine according to the present invention;

[0019] Figure 3 This is a stereoscopic diagram of the overall structure of a fixture for argon arc welding of a mixer lobe assembly of an aircraft engine according to the present invention;

[0020] Figure 4 This is a schematic diagram of the installation position of the conversion scale of the present invention;

[0021] Figure 5 It is a partial cross-sectional structural schematic diagram of a fixture for argon arc welding of a mixer lobe assembly of an aircraft engine according to the present invention;

[0022] Figure 6 This is a schematic diagram of the conversion scale structure of the present invention;

[0023] Figure 7 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0025] Fig. 9This is a schematic structural diagram of Embodiment 4 of the present invention;

[0026] Fig.10 It is a schematic diagram of the overall structure of the welding system of the present invention;

[0027] Fig.11 This is a schematic diagram of the curved single-piece back structure of the present invention;

[0028] Fig.12 This is a schematic diagram of the curved surface single piece front structure of the present invention;

[0029] Fig.13 This is a schematic diagram of the structure of the finished workpiece after welding according to the present invention.

[0030] 1- fixture base, 2- large disc, 3- clamping positioning mechanism, 4- arc positioning component, 5- cylinder mechanism, 6- lifting disc mechanism, 7- top circle positioning mechanism, 8- lifting disc locking mechanism, 9- guide mechanism, 10- unloading mechanism, 11- automatic control valve assembly, 12- conversion scale, 13- welding system, 14- control system, 15- positioner, 16- tooling fixture, 17- robot system, 18- power system. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] See also Figure 1-13This embodiment is described as a fixture for argon arc welding of a mixer lobe assembly of an aircraft engine, which includes a large disc 2, a clamping and positioning mechanism 3, an arc positioning component 4, a cylinder mechanism 5, a lifting disc mechanism 6 and a top circle positioning mechanism 7. The large disc 2 is evenly provided with a plurality of workpiece assembly positions along the circumferential direction, and a clamping and positioning mechanism 3 is installed on each workpiece assembly position. The clamping and positioning mechanism 3 includes a fixed end and a movable end, and the fixed end is fixedly connected to the large disc 2. The movable end includes a clamping plate and a positioning block. The number of the clamping plates is two and both have an arc. The two clamping plates are connected to the positioning block. The fixed end is connected to the positioning block through a radial moving device, and the movable end is driven to move radially along the large disc 2 by the radial moving device. The positioning block cooperates with the clamping block through bolts to clamp the large disc 2. The cylinder mechanism 5 is installed On the large disc 2, the cylindrical mechanism 5 is evenly provided with a plurality of guide grooves along the circumferential direction. The number of the guide grooves is the same as that of the workpiece assembly positions, and the positions correspond. An arc positioning component 4 is arranged at each guide groove. The front end of the arc positioning component 4 is an arc structure, and the rear end is provided with a tapered guide block. The lower end is bolted and cooperates with the clamping block to clamp the large disc 2. The rear end of the arc positioning component 4 is connected to the cylindrical mechanism 5 through a tension spring mechanism. The arc positioning component 4 can slide radially along the large disc 2. The bottom of the lifting disc mechanism 6 is a tapered structure, and the tapered structure cooperates and contacts with the tapered guide block at the rear end of the arc positioning component 4. The lifting disc mechanism 6 is connected to the large disc 2 through an axial moving device, and the lifting disc mechanism 6 is driven to move axially along the cylindrical mechanism 5 through the axial moving device. The top circle positioning mechanism 7 is concentrically fixedly installed above the cylindrical mechanism 5.

[0033] Embodiment 1: Figure 1-6 As shown, this embodiment can realize continuous welding of 24 curved welds in one clamping, the large disc 2 is concentrically installed above the clamp base 1, the clamp base 1 and the large disc 2 are positioned by the stopper to ensure concentricity, and the clamp base 1 is installed on the turntable of the positioner. The large disc 2 is evenly provided with 24 workpiece assembly positions along the circumferential direction. The 24 workpiece assembly positions are the assembly positions of 24 lobe parts. 24 sets of clamping and positioning mechanisms 3 are installed on the 24 workpiece assembly positions. The fixed end of the clamping and positioning mechanism 3 is fixedly connected to the large disc 2. A lead screw and a light rod are installed on the fixed end. Two clamping plates with arcs clamp the weld edge of the workpiece. The clamping plate is connected to the positioning block through a pin shaft. A nut and a linear bearing are installed on the positioning block. The nut is connected with the lead screw, and the linear bearing is connected with the light rod. The light rod plays a guiding role, and the lead screw plays a role in transmitting power. A clamping block is arranged at the bottom of the positioning block. When the bolts on the clamping block are tightened, the bottom of the moving end clamps the large disc 2 in the middle, and the moving end can move radially along the large disc 2. When the lead screw rotates clockwise, the moving end makes a linear motion outward on the large disc 2. When the lead screw moves counterclockwise, the moving end makes a linear motion along the radius direction toward the center of the circle on the large disc 2.

[0034] The arc structure at the front end of the arc positioning component 4 is made of red copper. Two rows and multiple columns of circular holes are opened on the arc structure, and a flow channel is opened inside. A gas pipeline is set at the rear. Shielding gas is input into the gas pipeline, and the shielding gas flows out from the multiple columns of circular holes through the flow channel. The shielding gas is introduced to play a role of back protection during welding. The arc positioning component 4 can move radially along the large disc 2, and can clamp the large disc 2 through bolts and clamping blocks. The reason for the movement is that the weld will shrink during welding, and the workpiece after welding will hold the arc positioning component 4 tightly. When unloading after welding, the arc positioning component 4 needs to be retreated to the innermost part to facilitate unloading. In addition, the movable arc positioning component 4 can also adapt to the shrinkage before and after welding. In addition, the width and relative position of the arc positioning component 4 are also the size and positioning of the 24 inner cavities of the finished workpiece.

[0035] The cylindrical mechanism 5 is installed on the large disc 2. The cylindrical mechanism 5 and the large disc 2 are positioned by the stopper. 24 guide grooves are opened on the cylindrical mechanism 5. The 24 guide grooves correspond to the positions of the 24 workpiece assembly positions one by one. The tapered guide block at the rear end of the arc positioning component 4 cooperates with the corresponding guide groove on the cylindrical mechanism 5 to realize the guiding function. A tension spring mechanism is also installed behind the arc positioning component 4. One end of the tension spring mechanism is connected to the arc positioning component 4, and the other end is connected to the cylindrical mechanism 5. The tension spring mechanism is the power source when the arc positioning component 4 moves toward the center of the circle along the radial direction.

[0036] The lifting disk mechanism 6 adjusts the 24 arc positioning components 4 along the radial linear motion of the large disc 2. The bottom of the lifting disk mechanism 6 is a tapered structure, and the tapered structure cooperates with the tapered guide block at the rear end of the arc positioning component 4. The outer diameter of the upper part of the lifting disk mechanism 6 and the inner diameter of the cylinder of the cylinder mechanism 5 match to guide the lifting disk mechanism 6 when it is lifted. The lifting disk mechanism 6 is connected to the large disc 2 through an axial moving device, and the lifting disk mechanism 6 is driven to move axially along the cylinder mechanism 5 through the axial moving device. The axial moving device includes a screw and a nut. The lifting disk mechanism 6 is fixedly installed with a screw, and the center of the large disc 2 is fixedly installed with a nut. The screw on the lifting disk mechanism 6 Cooperating with the nut on the large disc 2, when the screw is rotated clockwise, the lifting disc mechanism 6 moves downward along the axis of the cylinder mechanism 5. Since the taper of the bottom of the lifting disc mechanism 6 and the taper guide block corresponding to the arc positioning component 4 cooperate, the 24 sets of arc positioning components 4 move outward along the radius of the large disc 2; when the screw is rotated counterclockwise, the lifting disc mechanism 6 moves upward in the cylinder mechanism 5 along the axis of the cylinder. Since the lifting disc mechanism 6 rises, the conical surface below the lifting disc mechanism 6 and the taper guide block at the rear end of the arc positioning component 4 separate. At this time, the tension spring mechanism behind the arc positioning component 4 starts to work, pulling the 24 sets of arc positioning components 4 toward the center of the circle. The top circle positioning mechanism 7 is fixed on the top of the cylinder mechanism 5 by bolts. The top circle positioning mechanism 7 and the cylinder mechanism 5 are positioned by the stopper to ensure concentricity. At the same time, the top circle positioning mechanism 7 also plays the role of positioning and sizing the upper circle of the workpiece and pressing the top of the workpiece.

[0037] The fixture also includes a lifting plate locking mechanism 8, a guide mechanism 9, a discharging mechanism 10, an automatic control valve assembly 11 and a conversion scale 12. There are two lifting plate locking mechanisms 8, which are evenly installed on the large disc 2. When the outer circle of the fixture is adjusted to a fixed value, the lifting plate mechanism 6 and the lifting plate locking mechanism 8 are connected and fastened by bolts to achieve the locking of the lifting plate mechanism 6. There are two guide mechanisms 9, which are inner and outer sleeve structures. The outer sleeve is fixed on the large disc 2, and the inner sleeve is fixed on the lifting plate mechanism 6. The outer sleeve and the inner sleeve are connected in cooperation to achieve the guiding effect when the lifting plate mechanism 6 is lifted. The upper and lower extremes of the guide mechanism 9 are provided with limited position structures to achieve the limit function of the upper and lower ends when the lifting plate mechanism 6 moves. The unloading mechanism 10 is a cylinder structure, and the number is 6. The 6 unloading mechanisms 10 are evenly installed at the bottom of the large disc 2. When welding is completed, the top circle positioning mechanism 7 is removed, and the moving ends of the 24 sets of clamping positioning mechanisms 3 are all moved to the outermost side. At this time, the cylinder rod is controlled to extend, and the workpiece is pushed out through the push-out head on the cylinder rod to achieve the purpose of unloading. There are 5 groups of automatic control valve components 11, of which 4 groups each include 6 protective gas valves to control the protective gas, and the other group includes a compressed air valve to control the 6 unloading mechanisms 10. The protective gas valve is connected to the gas pipeline to control the output of the protective gas, and the compressed air valve is connected to the cylinder to control the extension and contraction of the cylinder rod of the cylinder. The conversion scale 12 is respectively set on the inner side of the cylinder mechanism 5 and the lifting plate mechanism 6. By reading the conversion scale 12, the diameter value of the outer circle surrounded by the 24 arc positioning components 4 can be determined when the lifting plate mechanism 6 is lifted to the corresponding position.

[0038] Before assembly, use a fixed-torque pneumatic wrench to move the moving end of the clamping and positioning mechanism 3 to the outermost part. The fixed-torque pneumatic wrench sets the torque. The set torque value can control the deformation of the product during welding, and will not damage the arc positioning component 4 due to excessive clamping force. After the fixed-torque pneumatic wrench reaches the set torque, the wrench switches to idling, and there is almost no reaction force. Rotate the screw on the lifting disk mechanism 6 to adjust the outer circle surrounded by the arc positioning component 4 to the required value. The outer circle diameter can be read on the conversion scale 12. After adjusting the value, tighten the bolts of the lifting disk locking mechanism 8 to lock the arc positioning component 4. Place the 1-24 lobe pieces on the tooling in turn. Each time a lobe is placed, the moving end of the clamping and positioning mechanism 3 is rotated to the clamping state with a fixed-torque pneumatic wrench. When it is fully clamped, the positioning block inside the clamping and positioning mechanism 3 tightly supports the outer cavity of the workpiece, achieving the positioning of the width of the outer cavity. After arranging the 24 pieces in sequence, adjust the clamping and positioning mechanism 3, and 24 spatial curved welds are formed. At this time, the top circle positioning mechanism 7 is hoisted onto the cylindrical mechanism 5. There are two positioning blocks on the cylindrical mechanism 5. The top circle positioning mechanism 7 is provided with holes that match the positioning blocks. After aligning the positions, tighten the connecting bolts to achieve the purpose of clamping the upper parts, and also achieve the function of positioning and sizing the upper circle diameter. At this time, the positioner 15 is flipped to an angle and weld position suitable for the robot system 17 welding, and the automatic control valve assembly 11 opens the protective gas of the corresponding welding position. The robot system 17 starts welding. After welding one seam, the turntable of the positioner 15 is turned to another weld position, and the previous operation is continued until all 24 welds are welded. After welding, the positioner 15 is flipped to the unloading angle, and the movable end of the clamping and positioning mechanism 3 is moved to the outermost side with a fixed-torque pneumatic wrench, the top circle positioning mechanism 7 is removed, and then the bolts of the lifting plate locking mechanism 8 are loosened, and the screw on the lifting plate mechanism 6 is rotated counterclockwise to adjust the outer circle surrounded by the arc positioning component 4 to the minimum. The compressed air valve in the automatic control valve assembly 11 is used to control the six groups of cylinder rods in the unloading mechanism 10 to extend at the same time, and the workpiece is pushed out through the push-out head on the cylinder rod, so that the workpiece is completely separated from the arc positioning component 4. At this time, the workpiece can be taken down manually to check and measure whether the workpiece after welding meets the requirements of the drawing.

[0039] Embodiment 2: Figure 7 As shown, the difference between this embodiment and the first embodiment is that in this embodiment, the workpieces are pressed by hydraulic cylinders after assembly to control deformation during welding, and a gantry type is used before and after assembly and for unloading.

[0040] Embodiment 3: Figure 8 As shown, the difference between this embodiment and the first embodiment is that in this embodiment, the push-pull rod is driven by a hydraulic cylinder, and the push-pull rod presses the workpiece at two points, such as the upper and lower points, to control the deformation during welding.

[0041] Embodiment 4: Fig. 9As shown, the difference between this embodiment and embodiment 1 is that this embodiment adopts hydraulic clamping, which can be twenty-four hydraulic cylinders driving a connecting rod mechanism to clamp the twenty-four individual parts respectively, or there can be two external hydraulic cylinders driving a clamping and positioning mechanism 3. When the positioner turntable rotates to a position, the two external hydraulic cylinders clamp, so that the workpiece is clamped during the welding process.

[0042] The above is a detailed introduction to a tooling fixture for argon arc welding of aircraft engine mixer lobe assemblies provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technicians in this field, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A fixture for argon arc welding of aero-engine mixer lobe components, characterized in that: It comprises a large disc (2), a clamping and positioning mechanism (3), an arc positioning component (4), a cylinder mechanism (5), a lifting disc mechanism (6) and a top circle positioning mechanism (7). The large disc (2) is evenly provided with a plurality of workpiece assembly positions along the circumferential direction. A clamping and positioning mechanism (3) is installed on each workpiece assembly position. The clamping and positioning mechanism (3) comprises a fixed end and a movable end. The fixed end is fixedly connected to the large disc (2). The movable end comprises a clamping plate and a positioning block. The number of the clamping plates is two and both have an arc. The two clamping plates are connected to the positioning block. The fixed end is radially movable. The cylindrical mechanism (5) is connected to the positioning block, and the moving end is driven to move radially along the large disc (2) through the radial moving device. The cylindrical mechanism (5) is installed on the large disc (2). The cylindrical mechanism (5) is evenly provided with a plurality of guide grooves along the circumferential direction. The number of the guide grooves is the same as that of the workpiece assembly position, and the positions correspond. An arc positioning component (4) is arranged at each guide groove. The front end of the arc positioning component (4) is an arc structure, and the rear end is provided with a tapered guide block. The rear end of the arc positioning component (4) is connected to the cylindrical mechanism (5) through a tension spring mechanism. The arc positioning component (4) slides radially along the large disc (2). The bottom of the lifting plate mechanism (6) is a tapered structure, and the tapered structure cooperates with the tapered guide block at the rear end of the arc positioning component (4). The lifting plate mechanism (6) is connected to the large disc (2) via an axial moving device, and the lifting plate mechanism (6) is driven by the axial moving device to move axially along the cylindrical mechanism (5). The top circle positioning mechanism (7) is coaxially fixedly installed above the cylindrical mechanism (5). The arc structure at the front end of the arc positioning component (4) is made of copper. The arc structure at the front end of the arc positioning component (4) is provided with multiple rows of circular holes, and a flow channel is provided inside. A gas pipeline is provided at the rear to A protective gas is input into the gas pipeline, and the protective gas flows out from the multiple rows of circular holes through the flow channel. The fixture further comprises a lifting plate locking mechanism (8) and a guide mechanism (9). The lifting plate locking mechanism (8) is provided in two pieces. The two lifting plate locking mechanisms (8) are evenly mounted on the large disc (2) and are fastened to the lifting plate mechanism (6) by bolts to achieve locking of the lifting plate mechanism (6). The guide mechanism (9) is an inner and outer sleeve structure. The outer sleeve is fixed to the large disc (2), and the inner sleeve is fixed to the lifting plate mechanism (6). The outer sleeve and the inner sleeve are connected in cooperation. A limited position structure is provided on the guide mechanism (9).

2. A fixture for argon arc welding of aero-engine mixer lobe components according to claim 1, characterized in that: The fixture further comprises a piece unloading mechanism (10), wherein the piece unloading mechanism (10) is multiple in number, and the multiple piece unloading mechanisms (10) are evenly mounted on the bottom of the large disc (2).

3. A fixture for argon arc welding of aero-engine mixer lobe assembly according to claim 2, characterized in that: The unloading mechanism (10) is a cylinder structure.

4. A fixture for argon arc welding of aero-engine mixer lobe assembly according to claim 3, characterized in that: The fixture further comprises an automatic control valve assembly (11), the automatic control valve assembly (11) comprising a protective gas valve and a compressed air valve, the protective gas valve being connected to a gas pipeline to control the output of the protective gas, and the compressed air valve being connected to a cylinder to control the extension and retraction of a cylinder rod of the cylinder.

5. The fixture for argon arc welding of aero-engine mixer lobe assembly according to claim 1, characterized in that: The radial moving device comprises a lead screw, a polished rod, a nut and a linear bearing. The lead screw and the polished rod are installed on the fixed end, and the nut and the linear bearing are installed on the positioning block. The nut is connected with the lead screw, and the linear bearing is connected with the polished rod.

6. The fixture for argon arc welding of aero-engine mixer lobe assembly according to claim 1, characterized in that: The axial movement device comprises a lead screw and a nut, the lead screw is fixedly mounted on the lifting disk mechanism (6), the nut is fixedly mounted at the center of the large disk (2), and the lead screw on the lifting disk mechanism (6) is connected in a mating manner with the nut on the large disk (2).

7. The fixture for argon arc welding of aero-engine mixer lobe assembly according to claim 1, characterized in that: The fixture further comprises a conversion scale (12), wherein the conversion scale (12) is respectively arranged on the inner side of the cylinder mechanism (5) and on the lifting plate mechanism (6).

8. The fixture for argon arc welding of aero-engine mixer lobe components according to claim 1, characterized in that: The large disc (2) is concentrically mounted above the fixture base (1), and the fixture base (1) is mounted on a positioner turntable.

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