Arc welding repair device for damage of oil and gas pipe joint of aero-engine

Abstract

The utility model discloses a damaged arc welding repair device for a damaged joint of an aero-engine oil-gas pipe. The device comprises a base, a six-axis mechanical arm, an oil gas pipe clamp, a supporting frame, a machining / positioning tool and a convex lug positioning tool. According to the utility model, the support frame, the short positioning tool and the lug positioning tool are adopted to complete the space positioning of the oil-gas pipe, the inner hole expanding tool and the end flattening tool are adopted to complete the notch processing after the oil-gas pipe joint is cut, the support frame, the long positioning tool and the lug positioning tool are adopted to complete the positioning of the new joint, and the argon tungsten-arc welding is adopted to complete the replacement and repair of the damaged joint. The device can solve the problem of poor consistency of the boundary dimension and the space vector of the original oil-gas pipe of the repaired oil-gas pipe joint, and ensures that the repaired oil-gas pipe can be mounted on an engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding equipment, and particularly relates to an arc welding repair device for damaged oil and gas pipe joints of an aero-engine. Background Art

[0002] The oil and gas pipes of an aero-engine are usually used for the transportation of hydraulic oil, fuel oil, lubricating oil and gas. Positioning devices are generally adopted for the joint fasteners to improve the assembly accuracy of the oil and gas pipes, and thread locking is adopted to improve the reliability. Due to the large environmental vibration during the operation of the aero-engine, damage such as contact surface abrasion may occur at the positioning part and the locking part of the oil and gas pipe joint due to vibration and other reasons.

[0003] The core components of the aero-engine and the oil and gas pipes will deform under the action of high temperature and high stress. Since the oil and gas pipes produced according to the designed dimensions do not consider the random deformation problem after service, the contact surface pressure at the positioning part and the locking part is too large after installation, thus increasing the probability of damage to the oil and gas pipe joint. On the premise of not changing the external dimensions of the damaged oil and gas pipe, replacing the original damaged joint with a new joint by arc welding technology can reduce the number of spare parts of the aero-engine, shorten the maintenance cycle and reduce the probability of damage after maintenance. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the utility model is to provide an arc welding repair device for damaged oil and gas pipe joints of an aero-engine.

[0005] In order to achieve the above purpose, the arc welding repair device for damaged oil and gas pipe joints of the aero-engine provided by the utility model comprises: a base, a six-axis manipulator, an oil and gas pipe clamp, a support frame, a processing / positioning tool and a lug positioning tooling; wherein, the base is a horizontally arranged plate-like structure; one end of the six-axis manipulator is hinged to the right side of the base, and the other end is the execution end; the oil and gas pipe clamp is installed at the execution end of the six-axis manipulator and is used for clamping the oil and gas pipe; the lower end of the support frame is installed on the left side of the base; the processing / positioning tool is installed on the support frame and comprises a short positioning tool, an inner hole expanding tool, a flat mouth tool and a long positioning tool, and one of them can be selected according to different operations; the lower end of the lug positioning tooling is installed on the right side of the support frame; after the damaged joint of the oil and gas pipe is cut and processed, the new joint is installed between the oil and gas pipe and the support frame and is positioned by the long positioning tool and the lug positioning tooling.

[0006] The oil and gas pipe clamp comprises a fixed chuck, a movable chuck and a bolt; wherein, the bottom of the fixed chuck is a disc structure and is installed at the execution end of the manipulator, and the upper part is a square columnar structure and a semi-circular groove is formed at the right side part; the movable chuck is a square columnar structure and a semi-circular groove is formed at the left side part; after the fixed chuck and the movable chuck are fastened and locked by the bolt, the above two semi-circular grooves form a circular groove for clamping the oil and gas pipe, and the inner diameter of the circular groove is the same as the outer diameter of the oil and gas pipe.

[0007] The support frame includes a first set screw, a first positioning bolt, a support plate, and a first mounting plate; wherein, the first mounting plate is horizontally arranged; the first positioning bolt passes through the positioning hole on the first mounting plate to fix the first mounting plate on the base; the support plate is vertically arranged, the lower end is fixed on the first mounting plate, a round hole is formed in the upper part, positioning bosses are formed at both ends of the round hole, and a threaded hole communicating with the above-mentioned round hole is formed at the center position of the top; the first set screw is threadedly connected in the threaded hole, and the inner end abuts against the processing / locating tool inserted into the round hole to lock the processing / locating tool.

[0008] The processing / locating tool includes a support rod, a second set screw, a lever arm, a first lock nut, a second lock nut, a short locating rod, an internal hole reamer, a flat cutter, a third set screw, a guide post and a long locating rod; wherein, the support rod consists of a support section and a threaded section; the support section is cylindrical, with an outer diameter the same as the inner diameter of the locating hole on the first mounting plate, a groove is formed in the middle of the left end face, a blind hole is axially formed in the middle of the groove, and a bolt hole communicating with the blind hole is radially formed at a position slightly to the left in the middle; a round hole is radially formed at the right end of the threaded section; the first lock nut and the second lock nut are threadedly connected to the threaded section of the support rod from the inside to the outside; the lever arm is inserted into the round hole on the support rod; any one of the short locating rod, the internal hole reamer, the flat cutter and the long locating rod is used for different processing operations; the right ends of the short locating rod, the internal hole reamer, the flat cutter and the long locating rod are cylindrical, inserted into the blind hole on the support rod, and a bevel is formed on the cylinder, and the second set screw passes through the bolt hole on the support section and is locked on the bevel to prevent the short locating rod, the internal hole reamer, the flat cutter and the long locating rod from moving relative to each other along the axial direction, and the middle part is a boss, which is matched with the groove structure of the support section on the support rod to prevent the short locating rod, the internal hole reamer, the flat cutter and the long locating rod from moving relative to each other along the axial direction, and the left end face of the boss is a locating surface; the left side part of the short locating rod is cylindrical, with an outer diameter the same as the inner diameter of the oil and gas pipe joint, and the length is 3-5 mm shorter than that of the oil and gas pipe joint; the left side part of the internal hole reamer is cylindrical, and the left end is an internal hole reamer head, with an outer diameter the same as the inner diameter of the oil and gas pipe joint, and the length is 3-5 mm longer than that of the oil and gas pipe joint; the left side part of the flat cutter is cylindrical, with an outer diameter larger than the outer diameter of the oil and gas pipe, and the length is the same as that of the oil and gas pipe joint, the left end face is a face milling cutter, a blind hole is axially formed at the left end, and a bolt hole communicating with the blind hole is radially formed at the left side part; the guide post is a nail-shaped structure composed of a nail cap and a nail rod, the nail rod is inserted into the blind hole on the flat cutter and a bevel is formed on the circumferential surface, and the third set screw passes through the bolt hole on the flat cutter and is locked on the bevel of the nail rod to prevent the guide post from moving relative to each other along the axial direction, and the outer diameter of the nail cap is the same as the inner diameter of the oil and gas pipe; the left side part of the long locating rod is cylindrical, with an outer diameter the same as the inner diameter of the oil and gas pipe joint, and the length is 3-5 mm longer than that of the oil and gas pipe joint; install the short locating rod on the support rod, lock the second set screw, install the first lock nut, the second lock nut and the lever arm to form a short locating tool; install the internal hole reamer on the support rod, lock the second set screw, install the first lock nut, the second lock nut and the lever arm to form an internal hole expanding tool; install the flat cutter on the support rod, lock the second set screw, install the first lock nut, the second lock nut and the lever arm, and lock the guide post on the flat cutter with the third set screw to form a flat cutter tool; install the long locating rod on the support rod, lock the second set screw, install the first lock nut, the second lock nut and the lever arm to form a long locating tool.

[0009] The lug positioning tooling includes a lug support frame, a nut, a lug positioning plate, a second positioning bolt, a third positioning bolt, and a second mounting plate. Among them, the second mounting plate is horizontally arranged, and the third positioning bolt passes through the positioning hole on the second mounting plate to fix the second mounting plate on the base. The lug support frame is a vertically arranged plate-like structure, with the lower end fixed on the second mounting plate, and a semi-circular groove is formed in the upper part. At the same time, an arc groove concentric with the semi-circular groove is formed outside the semi-circular groove. The lug positioning plate is an L-shaped structure, one end is a plate-like structure with a straight groove formed in the middle, which is placed on one side of the lug support frame, and the other end is a positioning end composed of two square columns located on both sides. The second positioning bolt passes through the arc groove on the lug support frame and the straight groove on the lug positioning plate, and is fastened by a nut. When the support frame and the lug positioning tooling are installed on the base, the circular hole on the support plate and the center of the semi-circular groove on the lug support frame are on the same straight line.

[0010] The widths of the arc groove on the lug support frame and the straight groove on the lug positioning plate are the same as the outer diameter of the second positioning bolt.

[0011] The advantages and beneficial effects of the present utility model are as follows:

[0012] The arc welding replacement and repair device for damaged joints of the aero-engine oil and gas pipeline of the present utility model uses a support frame, a short positioning tool, and a lug positioning tooling to complete the spatial positioning of the oil and gas pipeline, uses an inner hole expanding tool and a flat mouth tool to complete the cutting of the incision after the oil and gas pipeline joint is cut, uses a support frame, a long positioning tool, and a lug positioning tooling to complete the positioning of the new joint, and uses tungsten inert gas welding to complete the replacement and repair of the damaged joint. This device can solve the problem of poor consistency of the original shape and size and spatial vector of the oil and gas pipeline joint after repair, and ensure that the repaired oil and gas pipeline can be installed on the engine. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the arc welding repair device for damaged joints of the aero-engine oil and gas pipeline provided by the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the oil and gas pipeline fixture in the present utility model;

[0015] Figure 3 It is a schematic structural diagram of the support frame in the present utility model;

[0016] Figure 4 It is a schematic structural diagram of the processing / positioning tool in the present utility model;

[0017] Figure 5 It is a schematic structural diagram of the lug positioning tooling in the present utility model;

[0018] Figure 6Schematic diagram of the positioning and clamping operation of the oil and gas pipeline in the present utility model;

[0019] Figure 7 Schematic diagram of the cutting operation of the damaged joint in the present utility model;

[0020] Figure 8 Schematic diagram of the positioning operation of the joint incision in the present utility model;

[0021] Figure 9 Schematic diagram of the inner surface machining operation of the joint weld in the present utility model;

[0022] Figure 10 Schematic diagram of the flat-mouth machining operation of the joint incision in the present utility model;

[0023] Figure 11 Schematic diagram of the new joint positioning in the present utility model. Detailed implementation manners

[0024] The present utility model will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present utility model cannot be limited thereby.

[0025] As Figure 1 shown, the arc welding repair device for damaged joints of the aero-engine oil and gas pipeline joints provided by the present utility model includes: a base 1, a six-axis manipulator 2, an oil and gas pipeline clamp 3, a support frame 5, a machining / positioning tool 6, and a lug positioning tooling 7; wherein, the base 1 is a horizontally arranged plate-like structure; one end of the six-axis manipulator 2 is hinged to the right side of the base 1, and the other end is an execution end; the oil and gas pipeline clamp 3 is installed at the execution end of the six-axis manipulator 2 and is used for clamping the oil and gas pipeline 4; the lower end of the support frame 5 is installed on the left side of the base 1; the machining / positioning tool 6 is installed on the support frame 5 and includes a short positioning tool 61, an inner hole expanding tool 62, a flat-mouth tool 63, and a long positioning tool 64, which can be selected according to different operations; the lower end of the lug positioning tooling 7 is installed on the right side of the support frame 5; after the damaged joint of the oil and gas pipeline 4 is cut and machined, the new joint 8 is installed between the oil and gas pipeline 4 and the support frame 5 and is positioned by the long positioning tool 64 and the lug positioning tooling 7.

[0026] As Figure 2 shown, the oil and gas pipeline clamp 3 includes a fixed chuck 3-01, a movable chuck 3-02, and a bolt 3-03; wherein, the bottom of the fixed chuck 3-01 is a disc structure and is installed at the execution end of the manipulator 2, and the upper part is a square columnar structure and a semi-circular groove is formed at the right side part; the movable chuck 3-02 is a square columnar structure and a semi-circular groove is formed at the left side part; after the fixed chuck 3-01 and the movable chuck 3-02 are fastened and locked by the bolt 3-03, the above two semi-circular grooves form a circular groove for clamping the oil and gas pipeline 4, and the inner diameter of the circular groove is the same as the outer diameter of the oil and gas pipeline 4.

[0027] As Figure 3 shown, the support frame 5 includes a first set screw 5-01, a first positioning bolt 5-02, a support plate 5-03 and a first mounting plate 5-04; wherein, the first mounting plate 5-04 is horizontally arranged; the first positioning bolt 5-02 passes through the positioning hole on the first mounting plate 5-04 to fix the first mounting plate 5-04 on the base 1; the support plate 5-03 is vertically arranged, the lower end is fixed on the first mounting plate 5-04, a round hole is formed in the upper part, positioning bosses are formed at both ends of the round hole, and a threaded hole communicating with the above-mentioned round hole is formed at the center position of the top; the first set screw 5-01 is threadedly connected in the threaded hole, and the inner end abuts against the processing / locating tool 6 inserted into the round hole to lock the processing / locating tool 6.

[0028] As Figure 4As shown, the processing / locating tool 6 includes a support rod 6-01, a second set screw 6-02, a lever arm 6-03, a first lock nut 6-04, a second lock nut 6-05, a short locating rod 6-11, an internal hole reamer 6-21, a flat end mill 6-31, a third set screw 6-32, a guide post 6-33, and a long locating rod 6-41. Among them, the support rod 6-01 consists of a support section and a threaded section. The support section is cylindrical, with an outer diameter the same as the inner diameter of the locating hole on the first mounting plate 5-04. A groove is formed in the middle of the left end face, a blind hole is formed axially in the middle of the groove, and a bolt hole communicating with the blind hole is formed radially at a position slightly to the left in the middle. A circular hole is formed radially at the right end of the threaded section. The first lock nut 6-04 and the second lock nut 6-05 are threadedly connected to the threaded section of the support rod 6-01 from the inside to the outside. The lever arm 6-03 is inserted into the circular hole on the support rod 6-01. During different processing operations, any one of the short locating rod 6-11, the internal hole reamer 6-21, the flat end mill 6-31, and the long locating rod 6-41 is used. The right ends of the short locating rod 6-11, the internal hole reamer 6-21, the flat end mill 6-31, and the long locating rod 6-41 are cylindrical, inserted into the blind hole on the support rod 6-01, and a bevel is formed on the cylinder. The second set screw 6-02 passes through the bolt hole on the support section and is locked on the bevel to prevent the short locating rod 6-11, the internal hole reamer 6-21, the flat end mill 6-31, and the long locating rod 6-41 from moving relative to each other along the axial direction. The middle part is a boss, which is matched with the groove structure of the support section on the support rod 6-01 to prevent the short locating rod 6-11, the internal hole reamer 6-21, the flat end mill 6-31, and the long locating rod 6-41 from moving relative to each other along the axial direction. The left end face of the boss is a locating surface. The left side part of the short locating rod 6-11 is cylindrical, with an outer diameter the same as the inner diameter of the joint of the oil and gas pipe 4, and the length is 3 - 5 mm shorter than that of the joint of the oil and gas pipe 4. The left side part of the internal hole reamer 6-21 is cylindrical, and the left end is an internal hole reamer head, with an outer diameter of the internal hole reamer head the same as the inner diameter of the joint of the oil and gas pipe 4, and the length is 3 - 5 mm longer than that of the joint of the oil and gas pipe 4. The left side part of the flat end mill 6-31 is cylindrical, with an outer diameter larger than the outer diameter of the oil and gas pipe 4, and the length is the same as the length of the joint of the oil and gas pipe 4. The left end face is a face mill, a blind hole is formed axially at the left end, and a bolt hole communicating with the blind hole is formed radially at the left side part. The guide post 6-33 is a nail-shaped structure composed of a nail cap and a nail rod. The nail rod is inserted into the blind hole on the flat end mill 6-31 and a bevel is formed on the circumferential surface. The third set screw 6-32 passes through the bolt hole on the flat end mill 6-31 and is locked on the bevel of the nail rod to prevent the guide post 6-33 from moving relative to each other along the axial direction. The outer diameter of the nail cap is the same as the inner diameter of the oil and gas pipe 4. The left side part of the long locating rod 6-41 is cylindrical, with an outer diameter the same as the inner diameter of the joint of the oil and gas pipe 4, and the length is 3 - 5 mm longer than that of the joint of the oil and gas pipe 4.Install the short positioning rod 6-11 on the support rod 6-01, lock the second set screw 6-02, install the first lock nut 6-04, the second lock nut 6-05 and the lever arm 6-03 to form the short positioning tool 61; install the internal hole reamer 6-21 on the support rod 6-01, lock the second set screw 6-02, install the first lock nut 6-04, the second lock nut 6-05 and the lever arm 6-03 to form the internal hole expanding tool 62; install the flat nose tool 6-31 on the support rod 6-01, lock the second set screw 6-02, install the first lock nut 6-04, the second lock nut 6-05 and the lever arm 6-03, and lock the guide post 6-33 on the flat nose tool 6-31 with the third set screw 6-32 to form the flat nose tool 63; install the long positioning rod 6-41 on the support rod 6-01, lock the second set screw 6-02, install the first lock nut 6-04, the second lock nut 6-05 and the lever arm 6-03 to form the long positioning tool 64.;

[0029] As Figure 5 Shown in the figure, the lug positioning tooling 7 includes a lug support frame 7-01, a nut 7-02, a lug positioning plate 7-03, a second positioning bolt 7-04, a third positioning bolt 7-05 and a second mounting plate 7-06; wherein, the second mounting plate 7-06 is horizontally arranged, and the third positioning bolt 7-05 passes through the positioning hole on the second mounting plate 7-06 to fix the second mounting plate 7-06 on the base 1; the lug support frame 7-01 is a vertically arranged plate-like structure, the lower end is fixed on the second mounting plate 7-06, and a semi-circular groove is formed in the upper part, and an arc groove concentric with the semi-circular groove is formed outside the semi-circular groove; the lug positioning plate 7-03 is an L-shaped structure, one end is a plate-like structure and a straight groove is formed in the middle, which is placed on one side of the lug support frame 7-01, and the other end is a positioning end composed of two square cylinders located on both sides; the second positioning bolt 7-04 passes through the arc groove on the lug support frame 7-01 and the straight groove on the lug positioning plate 7-03, and is fastened by the nut 7-02; when the support frame 5 and the lug positioning tooling 7 are installed on the base 1, the circular hole on the support plate 5-03 and the center of the semi-circular groove on the lug support frame 7-01 are on the same straight line.

[0030] The widths of the arc groove on the lug support frame 7-01 and the straight groove on the lug positioning plate 7-03 are the same as the outer diameter of the second positioning bolt 7-04.

[0031] Now, the usage method of the arc welding repair device for the oil and gas pipe joint of the aero-engine is described as follows:

[0032] When the oil and gas pipe 4 joint is damaged and the new joint 8 needs to be replaced by using the above-mentioned arc welding repair device for the oil and gas pipe joint of the aero-engine, as Figure 6 、 8As shown in the figure, first, perform the positioning and clamping operation on the oil and gas pipe 4: file off the burrs at the damaged part of the joint of the oil and gas pipe 4 with a metal file, and then thoroughly clean the dirt inside and outside the oil and gas pipe 4 with an organic solvent; pass the first positioning bolt 5-02 through the positioning hole to fasten the support frame 5 on the base 1; install the short positioning rod 6-11 on the support rod 6-01, lock the second set screw 6-02, install the first lock nut 6-04, screw the second lock nut 6-05 counterclockwise to lock the first lock nut 6-04, and install the lever arm 6-03, thus completing the assembly of the short positioning tool 61; pass the short positioning rod 6-11 on the short positioning tool 61 from outside to inside through the round hole on the support frame 5. At this time, the positioning rod 6-11 will point to the six-axis manipulator 2 until the left end face of the first lock nut 6-04 is closely attached to the positioning boss on the right side of the round hole on the support frame 5, and screw the first set screw 5-01 to lock the short positioning tool 61; put the joint of the oil and gas pipe 4 on the cylinder of the short positioning rod 6-11 until the outer end of the joint of the oil and gas pipe 4 abuts against the positioning surface of the short positioning rod 6-11; adjust the six-axis manipulator 2 so that the inner surface of the semi-circular groove on the fixed chuck 3-01 fits the surface of the straight pipe section of the oil and gas pipe 4 near the joint, and screw the bolt 3-03 to fasten the movable chuck 3-02 on the fixed chuck 3-01, thus completing the spatial positioning of the oil and gas pipe 4; pass the third positioning bolt 7-05 through the positioning hole to fasten the lug positioning tooling 7 on the base 1; adjust the lug positioning plate 7-03 so that the surfaces of the two square cylinders on the positioning end fit the same-side surfaces of the two lugs 4-01 on the joint of the oil and gas pipe 4, and lock the second positioning bolt 7-04, thus completing the positioning of the lugs on the joint of the oil and gas pipe 4.

[0033] Then, perform the operation of cutting the joint of the oil and gas pipe 4: as Figure 7 , 8 shown, screw the first set screw 5-01 to disassemble the short positioning tool 61 from the support frame 5, screw the first positioning bolt 5-02 to disassemble the support frame 5 from the base 1, and screw the third positioning bolt 7-05 to disassemble the lug positioning tooling 7 from the base 1. During the disassembly process, keep the relative position of the lug positioning plate 7-03 and the lug support frame 7-01 unchanged; measure the length L of the new joint 8, make a circumferential mark at a distance of L-(2 - 3)mm from the outer end face of the joint of the oil and gas pipe 4 as the cut 4-02, and cut off and discard the joint of the oil and gas pipe 4 from the cut 4-02.

[0034] After that, perform the operation of machining the inner surface of the joint weld: as Figure 9As shown, turn the second set bolt 6-02 to remove the short positioning rod 6-11 from the support rod 6-01, install the internal hole reamer 6-21 on the support rod 6-01, and lock the second set bolt 6-02 to form the internal hole expanding tool 62; turn the first positioning bolt 5-02 to fasten the support frame 5 to the base 1; pass the internal hole reamer 6-21 on the internal hole expanding tool 62 from outside to inside through the round hole on the support frame 5. At this time, the internal hole reamer 6-21 will point to the six-axis manipulator 2. Turn the force arm rod 6-03 to drive the internal hole expanding tool 62 to rotate and machine off the surplus height on the inner surface of the weld joint of the original oil and gas pipe 4 joint.

[0035] Then perform the operation of machining the flat end of the joint cut: As Figure 10 shown, remove the internal hole expanding tool 62 from the support frame 5, turn the second set bolt 6-02 to remove the internal hole reamer 6-21 from the support rod 6-01, install the flat end cutter 6-31 on the support rod 6-01, lock the second set bolt 6-02, and turn the third set bolt 6-32 to lock the guide post 6-33 on the flat end cutter 6-31 to form the flat end tool 63; pass the flat end cutter 6-31 on the flat end tool 63 from outside to inside through the round hole on the support frame 5. At this time, the flat end cutter 6-31 will point to the six-axis manipulator 2 until the distance between the left end face of the first locking nut 6-04 and the positioning boss on the right side of the round hole of the support frame 5 is 3-5 mm. Turn the first set bolt 5-01 to lock the flat end tool 63, measure the distance between the left end face of the first locking nut 6-04 and the positioning boss on the right side of the round hole of the support frame 5 and record it as D1; turn the second locking nut 6-05 to the right, turn the first locking nut 6-04 to the right so that the distance between the left end face of the first locking nut 6-04 and the positioning boss on the right side of the round hole of the support frame 5 is D1 + △L, where △L is the welding shrinkage. Turn the second locking nut 6-05 to the left to lock the first locking nut 6-04; turn the first set bolt 5-01 to loosen the flat end tool 63, turn the force arm rod 6-03 to drive the flat end tool 63 to rotate, cut the cut of the oil and gas pipe 4 until the left end face of the first locking nut 6-04 fits the positioning boss on the right side of the round hole of the support frame 5, and use a manual tool to clean the burrs on the cut surface.

[0036] After that, perform the operation of positioning the new joint: As Figure 11As shown, remove the flat tool 63 from the support frame 5, unscrew the second set screw 6-02 to remove the flat tool bit 6-31 from the support rod 6-01, install the long positioning rod 6-41 on the support rod 6-01, and lock the second set screw 6-02 to form the long positioning tool 64; pass the third positioning bolt 7-05 through the positioning hole to fasten the lug positioning tooling 7 to the base 1; place the new joint 8 between the oil and gas pipe 4 and the support frame 5, and rotate the new joint 8 so that the two lugs on the new joint 8 are in contact with the surfaces of the two square cylinders at the positioning ends on the lug positioning plate 7-03; pass the long positioning rod 6-41 on the long positioning tool 64 through the round hole on the support frame 5 and the new joint 8. At this time, the long positioning rod 6-41 will point to the six-axis manipulator 2 until the left end face of the first locking nut 6-04 is closely attached to the positioning boss on the right side of the round hole on the support frame 5, and then screw the first set screw 5-01 to lock the long positioning tool 64.

[0037] Finally, perform the arc welding installation operation of the new joint 8: position and weld 4 points equidistantly along the circumference of the weld joint to complete the positioning and welding assembly of the new joint 8; remove the oil and gas pipe 4 from the manipulator 2, and connect argon gas to form a back protection for the weld seam; align the welding torch with the incision, start the arc after the air in the arc starting area is displaced by the argon gas blown out through the gas cap of the welding torch, and rotate the welding torch around the incision by 360° to complete the welding process.

Claims

1. An arc welding repair device for damage of an aero-engine oil and gas pipe joint, characterized in that: The arc welding repair device for the damaged joint of the aero-engine oil and gas pipe includes: a base (1), a six-axis manipulator (2), an oil and gas pipe clamp (3), a support frame (5), a processing / locating tool (6), and a lug locating tooling (7); wherein, the base (1) is a horizontally arranged plate-like structure; one end of the six-axis manipulator (2) is hinged to the right side of the base (1), and the other end is the execution end; the oil and gas pipe clamp (3) is installed at the execution end of the six-axis manipulator (2) and is used for clamping the oil and gas pipe (4); the lower end of the support frame (5) is installed on the left side of the base (1); the processing / locating tool (6) is installed on the support frame (5) and includes a short locating tool (61), an internal hole expanding tool (62), a flat mouth tool (63), and a long locating tool (64), one of which can be selected according to different operations; the lower end of the lug locating tooling (7) is installed on the right side of the support frame (5); after the damaged joint of the oil and gas pipe (4) is cut and processed, the new joint (8) is installed between the oil and gas pipe (4) and the support frame (5) and is located by the long locating tool (64) and the lug locating tooling (7).

2. The arc welding repair device for the damage of the aviation engine oil and gas pipe joint according to claim 1, wherein: The oil and gas pipe clamp (3) includes a fixed clamp head (3-01), a movable clamp head (3-02), and a bolt (3-03); wherein, the bottom of the fixed clamp head (3-01) is a disc structure and is installed at the execution end of the manipulator (2), and the upper part is a square columnar structure and a semi-circular groove is formed at the right side part; the movable clamp head (3-02) is a square columnar structure and a semi-circular groove is formed at the left side part; after the fixed clamp head (3-01) and the movable clamp head (3-02) are tightened and locked by the bolt (3-03), the above two semi-circular grooves form a circular groove for clamping the oil and gas pipe (4), and the inner diameter of the circular groove is the same as the outer diameter of the oil and gas pipe (4).

3. The arc welding repair device for the damage of the aviation engine oil and gas pipe joint according to claim 1, characterized in that: The support frame (5) includes a first set screw (5-01), a first positioning bolt (5-02), a support plate (5-03), and a first mounting plate (5-04); wherein, the first mounting plate (5-04) is horizontally arranged; the first positioning bolt (5-02) passes through the positioning hole on the first mounting plate (5-04) to fix the first mounting plate (5-04) on the base (1); the support plate (5-03) is vertically arranged, the lower end is fixed on the first mounting plate (5-04), a circular hole is formed in the upper part, positioning bosses are formed at both ends of the circular hole, and a threaded hole communicating with the above circular hole is formed at the center position of the top; the first set screw (5-01) is threadedly connected in the threaded hole, and the inner end abuts against the processing / locating tool (6) inserted into the circular hole to lock the processing / locating tool (6).

4. The arc welding repair device for the damage of the aviation engine oil and gas pipe joint according to claim 1, characterized in that: The processing / locating tool (6) includes a support rod (6-01), a second set screw (6-02), a lever arm (6-03), a first lock nut (6-04), a second lock nut (6-05), a short positioning rod (6-11), an internal hole reamer (6-21), a flat-end cutter (6-31), a third set screw (6-32), a guide post (6-33) and a long positioning rod (6-41); wherein, the support rod (6-01) consists of a support section and a threaded section; the support section is cylindrical, the outer diameter of which is the same as the inner diameter of the positioning hole on the first mounting plate (5-04), a groove is formed in the middle of the left end face, a blind hole is axially formed in the middle of the groove, and a bolt hole communicating with the blind hole is radially formed at a position slightly to the left in the middle; a circular hole is radially formed at the right end of the threaded section; the first lock nut (6-04) and the second lock nut (6-05) are threadedly connected to the threaded section of the support rod (6-01) from the inside to the outside; the lever arm (6-03) is inserted into the circular hole on the support rod (6-01); during different processing operations, any one of the short positioning rod (6-11), the internal hole reamer (6-21), the flat-end cutter (6-31) and the long positioning rod (6-41) is used; the right ends of the short positioning rod (6-11), the internal hole reamer (6-21), the flat-end cutter (6-31) and the long positioning rod (6-41) are cylindrical, inserted into the blind hole on the support rod (6-01), and a bevel surface is formed on the cylinder, and the second set screw (6-02) passes through the bolt hole on the support section and is locked on the bevel surface, the middle part is a boss, which is matched with the groove structure of the support section on the support rod (6-01) to prevent the short positioning rod (6-11), the internal hole reamer (6-21), the flat-end cutter (6-31) and the long positioning rod (6-41) from moving relative to each other in the axial direction, and the left end face of the boss is a positioning surface; the left side part of the short positioning rod (6-11) is cylindrical, the outer diameter of which is the same as the inner diameter of the joint of the oil and gas pipe (4), and the length is 3-5 mm shorter than that of the joint of the oil and gas pipe (4); the left side part of the internal hole reamer (6-21) is cylindrical, the left end is an internal hole reamer head, the outer diameter of the internal hole reamer head is the same as the inner diameter of the joint of the oil and gas pipe (4), and the length is 3-5 mm longer than that of the joint of the oil and gas pipe (4); the left side part of the flat-end cutter (6-31) is cylindrical, the outer diameter of which is larger than the outer diameter of the oil and gas pipe (4), the length is the same as the length of the joint of the oil and gas pipe (4), the left end face is a face mill, a blind hole is axially formed at the left end, and a bolt hole communicating with the blind hole is radially formed at the left side part; the guide post (6-33) is a nail-shaped structure composed of a nail cap and a nail rod, the nail rod is inserted into the blind hole on the flat-end cutter (6-31) and a bevel surface is formed on the circumferential surface, and the third set screw (6-32) passes through the bolt hole on the flat-end cutter (6-31) and is locked on the bevel surface of the nail rod to prevent the guide post (6-33) from moving relative to each other in the axial direction, and the outer diameter of the nail cap is the same as the inner diameter of the oil and gas pipe (4);The left part of the long positioning rod (6-41) is cylindrical, with an outer diameter equal to the inner diameter of the joint of the oil and gas pipe (4), and its length is 3-5 mm longer than that of the joint of the oil and gas pipe (4); Install the short positioning rod (6-11) on the support rod (6-01), lock the second set screw (6-02), install the first lock nut (6-04), the second lock nut (6-05) and the lever arm (6-03) to form a short positioning tool (61); Install the internal hole reamer (6-21) on the support rod (6-01), lock the second set screw (6-02), install the first lock nut (6-04), the second lock nut (6-05) and the lever arm (6-03) to form an internal hole expanding tool (62); Install the flat mouth cutter (6-31) on the support rod (6-01), lock the second set screw (6-02), install the first lock nut (6-04), the second lock nut (6-05) and the lever arm (6-03), and lock the guide post (6-33) on the flat mouth cutter (6-31) with the third set screw (6-32) to form a flat mouth tool (63); Install the long positioning rod (6-41) on the support rod (6-01), lock the second set screw (6-02), install the first lock nut (6-04), the second lock nut (6-05) and the lever arm (6-03) to form a long positioning tool (64).; 5. The arc welding repair device for the damage of the aviation engine oil and gas pipe joint according to claim 1, characterized in that: The lug positioning tooling (7) includes a lug support frame (7-01), a nut (7-02), a lug positioning plate (7-03), a second positioning bolt (7-04), a third positioning bolt (7-05) and a second mounting plate (7-06); wherein, the second mounting plate (7-06) is horizontally arranged, and the third positioning bolt (7-05) passes through the positioning hole on the second mounting plate (7-06) to fix the second mounting plate (7-06) on the base (1); the lug support frame (7-01) is a vertically arranged plate-like structure, the lower end is fixed on the second mounting plate (7-06), and a semi-circular groove is formed in the upper part, and an arc groove concentric with the semi-circular groove is formed outside the semi-circular groove; the lug positioning plate (7-03) is an L-shaped structure, one end is a plate-like structure and a straight groove is formed in the middle, which is placed on one side of the lug support frame (7-01), and the other end is a positioning end composed of two square columns located on both sides; the second positioning bolt (7-04) passes through the arc groove on the lug support frame (7-01) and the straight groove of the lug positioning plate (7-03), and is tightened by the nut (7-02); when the support frame (5) and the lug positioning tooling (7) are installed on the base (1), the circular hole on the support plate (5-03) and the center of the semi-circular groove on the lug support frame (7-01) are on the same straight line.

6. The arc welding repair device for the damage of the aviation engine oil and gas pipe joint according to claim 5, characterized in that: The widths of the arc groove on the lug support frame (7-01) and the straight groove on the lug positioning plate (7-03) are the same as the outer diameter of the second positioning bolt (7-04).

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