Welding clamp and method for low-pressure turbine guider

Abstract

The low-pressure turbine guider welding clamp comprises a base, a positioning block, a shaft, a pressing plate, a positioning plate and an air pipe, the positioning block is arranged on the base, one end of the shaft is connected with the base, the other end of the shaft is connected with the positioning plate, the pressing plate is arranged on the base, and the air pipe is arranged between the base and the pressing plate. According to the low-pressure turbine guider, numerous complex parts on the low-pressure turbine guider are avoided through shaft connection, the low-pressure turbine guider shell is fixed and supported through the positioning block, the pressing plate and the hook-shaped bolt, and the overall rigidity of the parts is improved; by utilizing the structural characteristics of the low-pressure turbine guider part, the gas pipe is connected with the gas inlet nozzles for different semi-rings, so that argon is fully filled after passing through the spray holes densely distributed on the semi-rings, and the problems of large welding deformation and unstable welding seam quality are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding fixtures, and in particular relates to a low-pressure turbine guide vane welding fixture and method. Background Art

[0002] The low-pressure turbine guide vane is one of the core components with the highest load-bearing capacity in the engine. Its main function is to rectify the high-temperature and high-pressure gas and convert the thermal energy and pressure potential energy of the gas into kinetic energy. The low-pressure turbine guide vane is welded on the low-pressure turbine guide vane housing by the wall panel assembly, sealing ring, sealing ring, front and rear partitions, bellows, bellows front ring and other parts. In order to meet the assembly relationship with the high-pressure guide vane and turbine support and subsequent processing, the coaxiality of the bellows is required to be within 0.2, and the flatness of the two ends of the low-pressure turbine guide vane housing is required to be within 0.2. Fig.10 As shown. Due to the complex structure of the low-pressure turbine guide vane and the large number of components, the overall rigidity of the parts is poor during welding, and it is difficult to fill argon gas, which makes the parts welding deformation large, the geometric tolerance is difficult to guarantee, and the weld quality is unstable, so repeated corrections are required, which reduces the processing economy and welding efficiency of the parts. Therefore, a low-pressure turbine guide vane welding fixture is needed, which can greatly reduce the welding deformation, maintain the stability of the weld quality, and reduce the welding risks caused by poor overall rigidity and difficulty in fully filling argon gas.

[0003] The patent document with the announcement number CN116900456A discloses a processing device and method for the outer casing of a low-pressure turbine guide vane, including a clamp body, an upper pressure plate arranged above the clamp body and a lower pressure plate arranged below the clamp body, an adjustment block is also arranged on the upper part of the clamp body, a vent is arranged on the adjustment block, a protective groove and a gas protection groove are arranged at both ends of the vent, and an air inlet nozzle connected to the gas protection groove is also arranged on the clamp body. However, the gas release position of the patent is fixed and cannot be close to the welding part of the welded parts, and the protective effect of the protective gas is affected.

[0004] The patent document with announcement number CN205097094U discloses an assembly fixture for a high-pressure turbine guide of an aircraft engine, which is composed of a base, a bearing, a screw, a cover plate, a shaft, a support plate, a nut and a positioning ring; the bearing is arranged at the center of the base; the cover plate is fixed to the base by screws; one end of the shaft is arranged in the bearing, and a support plate is arranged on the other end; the positioning ring is fixed to the support plate by a nut. The fixture of this patent cannot position and fix the side of the welding part, and lacks a shielding gas release component, so it is not suitable for use in processes requiring shielding gas welding. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a low-pressure turbine guide vane welding fixture and method.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a low-pressure turbine guide vane welding fixture, comprising a base, a positioning block, a shaft, a pressure plate, a positioning plate and an air pipe, wherein the base is provided with a positioning block, one end of the shaft is connected to the base, and the other end of the shaft is connected to the positioning plate, the pressure plate is provided on the base, and the air pipe is provided between the base and the pressure plate.

[0008] Preferably, the base is a spoke structure, the base includes an inner ring A, an outer ring A and a rib A, the inner ring A is connected to the outer ring A through the rib A, the inner ring A is provided with a mounting hole A, a positioning hole A and a fixing threaded hole A, the positioning hole A and the shoulder end face fixing hole A are arranged around the mounting hole A, the shaft extends into the mounting hole A and is connected to the base, and the positioning block is connected to the outer ring A.

[0009] Preferably, a fixing pin A is provided on the positioning hole A, and the base is positioned and installed with the shaft through the fixing pin A. A fixing screw A is provided on the fixing threaded hole A, and the base is connected and fastened with the shaft through the fixing screw A.

[0010] Preferably, the outer ring A is provided with a positioning hole B, a fixing threaded hole B and a load threaded hole A; the positioning hole B and the fixing threaded hole B are arranged on the side of the outer ring A close to the inner ring A; the load threaded holes A are evenly distributed on the outer ring A; and the rib A is provided with eye screws.

[0011] Preferably, a fixing pin B is provided on the positioning hole B, and the base is positioned and installed with the outer ring A through the fixing pin B. A fixing screw B is provided on the fixing threaded hole B, and the base is connected and fastened to the positioning block through the fixing screw B. A load screw is provided on the load threaded hole A, and the base is connected and fastened to the pressure plate through the load screw.

[0012] Preferably, a lower shoulder and an upper shoulder are provided on the shaft, a protruding portion A is provided at one end of the shaft, and a protruding portion B is provided at the other end of the shaft, the shaft is connected to the base via the protruding portion A, and the shaft is connected to the positioning plate via the protruding portion B, a positioning hole C and a fixing hole B are provided on the lower shoulder, and a fixing threaded hole C is provided on the upper shoulder.

[0013] Preferably, the positioning plate is a spoke-type structure, and the positioning plate comprises an inner ring A, an outer ring B and a rib plate B. The inner ring A is connected to the outer ring B through the rib plate B. The inner ring A is provided with a mounting hole B and a fixing hole C. The fixing hole C is arranged around the mounting hole B, and a fixing screw B is arranged on the fixing hole C.

[0014] Preferably, load threaded holes B are arranged on the outer ring B, and the load threaded holes B are evenly distributed on the circumference of the outer ring B. Hook bolts are arranged on the load threaded holes B. The tops of the hook bolts pass through the load threaded holes B and are threadedly connected with the load nuts. A welding handle is arranged on the rib plate B.

[0015] Preferably, the trachea is an annular structure, and the trachea includes an air guide pipe, a pipe joint, a semi-ring A and a semi-ring B. The air guide pipe is connected to the pipe joint, and the two ends of the semi-ring A are respectively connected to the two ends of the semi-ring B through a nozzle, and the end of the nozzle is connected to the trachea through an air nozzle to form a ventilation circuit. A number of fine holes are set on the semi-ring A and the semi-ring B.

[0016] Preferably, the cross section of the positioning block is L-shaped, and a positioning hole D and a countersunk fixing hole are provided on the positioning block.

[0017] A method for using a low-pressure turbine guide vane welding fixture comprises the following steps:

[0018] S1: Install the positioning block and shaft on the base, and then place the low-pressure turbine guide vane parts on the positioning block.

[0019] S2: Place the pressure plate on the base, then put the air pipe into the corresponding groove on the low-pressure turbine guide part, and connect the pipe joint to the external air supply device.

[0020] S3: Install the hook bolt on the positioning plate, then install the positioning plate on the shaft, twist the load nut to clamp the hook bolt on the low-pressure turbine guide vane part, and then start welding.

[0021] The beneficial effects of the present invention are:

[0022] The present invention avoids numerous complex parts on the low-pressure turbine guide vane by arranging a base and a positioning plate to be connected by an axis, and utilizes the positioning block on the base, the pressure plate and the hook-shaped bolts on the positioning plate to fix and support the low-pressure turbine guide vane housing, thereby improving and enhancing the overall rigidity of the low-pressure turbine guide vane parts; utilizing the structural characteristics of the low-pressure turbine guide vane parts themselves, placing the air pipe in an annular groove, and connecting it with the half ring A and the half ring B through an air inlet nozzle to form a ventilation circuit, so that argon gas can be fully filled after passing through the densely distributed spray holes on the half ring A and the half ring B, thereby solving the problems of large welding deformation and unstable weld quality, and reducing the welding risks caused by poor overall rigidity and difficulty in fully filling with argon gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the base of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the base of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the shaft of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the positioning plate of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the positioning plate of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the trachea of ​​the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the trachea of ​​the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the positioning block of the present invention;

[0032] Fig.10 It is the welding requirement view of the low pressure turbine guide vane;

[0033] In the figure: 1-base, 2-positioning block, 3-axis, 4-pressure plate, 5-positioning plate, 11-hook bolt, 12-trachea, 13-fixing pin A, 14-load nut, 16-fixing screw A, 17-eye screw, 18-fixing screw B, 19-load screw, 20-fixing screw B, 21-mounting hole A, 22-positioning hole A, 23-hole A, 24-positioning hole B, 25-fixing threaded hole B, 26-load threaded hole A, 27-positioning hole D, 28-countersunk fixing hole, 29-protruding part A, 3 0-protruding part B, 31-positioning hole C, 32-fixing hole B, 33-fixing threaded hole C, 34-mounting hole B, 35-fixing hole C, 36-welding handle, 37-load threaded hole B, 38-air guide tube, 39-pipe joint, 40-half ring A, 41-half ring B, 42-nozzle, 43-air nozzle, 44-fine hole, 101-inner ring A, 102-outer ring A, 103-rib A, 301-lower shoulder, 302-upper shoulder, 501-inner ring A, 502-outer ring B, 503-rib B. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0035] Example:

[0036] like Figures 1 to 9 As shown, a low-pressure turbine guide vane welding fixture includes a base 1, a positioning block 2, a shaft 3, a pressure plate 4, a positioning plate 5 and an air pipe 12. The positioning block 2 is arranged on the base 1, one end of the shaft 3 is connected to the base 1, and the other end of the shaft 3 is connected to the positioning plate 5. The pressure plate 4 is arranged on the base 1, and the air pipe 12 is arranged between the base 1 and the pressure plate 4.

[0037] The base 1 is a spoke-type structure, and the base 1 includes an inner ring A101, an outer ring A102 and a rib A103. The inner ring A101 is connected to the outer ring A102 through the rib A103. The inner ring A101 is provided with a mounting hole A21, a positioning hole A22 and a fixing threaded hole A23. The positioning hole A22 and the shoulder end surface fixing hole A23 are arranged around the mounting hole A21. The shaft 3 extends into the mounting hole A21 and is connected to the base 1. The mounting hole A21 is used to install the shaft 3, and a connection is formed between the shaft 3 and the positioning plate 5 to avoid interference with the low-pressure turbine guide vane parts. The positioning block 2 is connected to the outer ring A102.

[0038] One positioning hole A22 is provided, and a fixing pin A13 is provided on the positioning hole A22. The base 1 is positioned and installed with the shaft 3 through the fixing pin A13. Three fixing threaded holes A23 are provided, and a fixing screw A16 is provided on the fixing threaded hole A23. The base 1 is connected and fastened with the shaft 3 through the fixing screw A16 to prevent the shaft 3 from axial movement.

[0039] The outer ring A102 is provided with a positioning hole B24, a fixing threaded hole B25 and a load threaded hole A26. The positioning hole B24 and the fixing threaded hole B25 are arranged on the side of the outer ring A102 close to the inner ring A101. The load threaded holes A26 are evenly distributed on the outer ring A102. The rib A103 is provided with a lifting screw 17, and the lifting screw 17 is used for carrying the clamp.

[0040] There are 8 positioning holes B24, and a fixing pin B is provided on the positioning hole B24. The base 1 is positioned and installed with the outer ring A102 through the fixing pin B, so as to circumferentially position the 8 positions of the positioning block 2. There are 4 fixing threaded holes B25, and a fixing screw B20 is provided on the fixing threaded hole B25. The base 1 is connected and fastened to the positioning block 2 through the fixing screw B20 to prevent the positioning block 2 from shaking and losing the stable supporting effect. There are 8 load threaded holes A26, and a load screw 19 is provided on the load threaded hole A26. The base 1 is connected and fastened to the pressure plate 4 through the load screw 19.

[0041] The shaft 3 is provided with a lower shoulder 301 and an upper shoulder 302, a protruding portion A29 is provided at one end of the shaft 3, and a protruding portion B30 is provided at the other end of the shaft 3. The shaft 3 is connected to the mounting hole A21 of the base 1 through the protruding portion A29, and the shaft 3 is connected to the mounting hole B34 of the positioning plate 5 through the protruding portion B30. A positioning hole C31 and a fixing hole B32 are provided on the lower shoulder 301. One positioning hole C31 is provided, and a fixing pin A13 passes through the positioning hole C31 and the positioning hole A22 realizes the positioning and installation of the shaft 3 and the base 1. The fixing screw A16 penetrates the fixing threaded hole A23 and then is threadedly connected with the fixing hole B32 to realize the connection and fastening of the shaft 3 and the base 1. The upper shaft shoulder 302 is provided with a fixing threaded hole C33. There are 4 fixing threaded holes C33 and 3 fixing holes B32. The fixing screw A16 penetrates the fixing threaded hole A23 and the fixing hole B32 and then is threadedly connected with the fixing threaded hole C33 to realize the connection and fastening of the shaft 3 and the base 1.

[0042] The positioning plate 5 is a spoke-type structure, and the positioning plate 5 includes an inner ring A501, an outer ring B502 and a rib plate B503. The inner ring A501 is connected to the outer ring B502 through the rib plate B503. The inner ring A501 is provided with a mounting hole B34 and a fixing hole C35. The fixing hole C35 is arranged around the mounting hole B34. There are 4 fixing holes C35. The fixing hole C35 is provided with a fixing screw B18. The fixing screw B18 penetrates the fixing hole C35 and is threadedly connected with the fixing threaded hole C33 to realize the connection and fastening of the positioning plate 5 and the shaft 3.

[0043] The outer ring B502 is provided with a load threaded hole B37, and 12 load threaded holes B37 are evenly distributed on the outer ring B502 in a circumferential manner. A hook-shaped bolt 11 is provided on the load threaded hole B37, and the top of the hook-shaped bolt 11 passes through the load threaded hole B37 and is threadedly connected with the load nut 14. The hook-shaped end face of the hook-shaped bolt 11 is in close contact with the upper end face of the clamping low-pressure turbine guide device part. By evenly tightening the load nut 14, the hook-shaped bolt 11 is driven to apply a supporting force to the upper end face of the low-pressure turbine guide device part, which is conducive to reducing welding deformation and ensuring shape and position tolerance.

[0044] The rib plate B503 is provided with two welding handles 36 for transporting the positioning plate 5 .

[0045] The air pipe 12 is an annular structure, and the air pipe 12 includes an air guide pipe 38, a pipe joint 39, a semi-ring A40 and a semi-ring B41. The air guide pipe 38 and the pipe joint 39 are welded and connected. The pipe joint 39 is connected to an external argon device. The two ends of the semi-ring A40 are connected to the two ends of the semi-ring B41 through two nozzles 42 respectively. The end of the nozzle 42 is connected to the air pipe 12 through a gas nozzle 43 to form a ventilation circuit. A plurality of fine holes 44 are provided on the semi-ring A40 and the semi-ring B41. Argon is fully filled in the parts to be welded through the fine holes 44. The fine holes 44 on the semi-ring A40 and the semi-ring B41 are conducive to fully filling argon gas in multiple parts to be welded of the low-pressure turbine guide vane parts at the same time, thereby avoiding welding defects caused by uneven and incomplete argon filling.

[0046] The cross-section of the positioning block 2 is L-shaped. There are 8 positioning blocks 2. The 8 positioning blocks 2 form a circular ring structure and are arranged on the low-pressure turbine guide vane part. The top of the large end surface of the positioning block 2 supports the lower end surface of the low-pressure turbine guide vane part. The side inner wall of the positioning block 2 is in close contact with the side surface of the low-pressure turbine guide vane part to achieve positioning. Two positioning holes D27 and four countersunk fixing holes 28 are arranged on the positioning block 2. The position of the positioning hole D27 is corresponding to the position of the positioning hole B24. The positioning block 2 is positioned and installed on the base 1 by passing the fixing pin B through the positioning hole B24 and the positioning hole D27. The countersunk fixing hole 28 is arranged corresponding to the position of the fixing threaded hole B25. The positioning block 2 is connected and tightened to the base 1 by passing the fixing screw B20 through the countersunk fixing hole 28 and then threadedly connected with the fixing threaded hole B25.

[0047] A method for using a low-pressure turbine guide vane welding fixture comprises the following steps:

[0048] S1: Install the positioning block 2 and shaft 3 on the base 1, and then place the low-pressure turbine guide vane parts on the positioning block 2.

[0049] S2: Place the pressing plate 4 on the base 1, then put the air pipe 12 into the corresponding groove on the low-pressure turbine guide part, and connect the pipe joint 39 to the external air supply device.

[0050] S3: Install the hook bolt 11 on the positioning plate 5, then install the positioning plate 5 on the shaft 3, and tighten the hook bolt 11 to the low-pressure turbine guide vane part by twisting the load nut 14, and then start welding.

Claims

1. A low-pressure turbine guide vane welding fixture, characterized in that: The invention comprises a base (1), a positioning block (2), a shaft (3), a pressure plate (4), a positioning plate (5) and an air pipe (12); the positioning block (2) is arranged on the base (1); one end of the shaft (3) is connected to the base (1); the other end of the shaft (3) is connected to the positioning plate (5); the pressure plate (4) is arranged on the base (1); and the air pipe (12) is arranged between the base (1) and the pressure plate (4).

2. A low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The base (1) is a spoke-type structure, comprising an inner ring A (101), an outer ring A (102) and a rib A (103); the inner ring A (101) is connected to the outer ring A (102) via the rib A (103); a mounting hole A (21), a positioning hole A (22) and a fixing threaded hole A (23) are arranged on the inner ring A (101); the positioning hole A (22) and the shoulder end surface fixing hole A (23) are arranged around the mounting hole A (21); the shaft (3) extends into the mounting hole A (21) and is connected to the base (1); and the positioning block (2) is connected to the outer ring A (102).

3. A low-pressure turbine guide vane welding fixture as claimed in claim 2, characterized in that: A fixing pin A (13) is arranged on the positioning hole A (22), and the base (1) is positioned and installed with the shaft (3) through the fixing pin A (13). A fixing screw A (16) is arranged on the fixing threaded hole A (23), and the base (1) is connected and fastened with the shaft (3) through the fixing screw A (16).

4. A low-pressure turbine guide vane welding fixture as claimed in claim 2, characterized in that: The outer ring A (102) is provided with a positioning hole B (24), a fixing threaded hole B (25) and a load threaded hole A (26); the positioning hole B (24) and the fixing threaded hole B (25) are provided on a side of the outer ring A (102) close to the inner ring A (101); the load threaded holes A (26) are evenly distributed on the outer ring A (102); and the rib plate A (103) is provided with a lifting eye screw (17).

5. A low-pressure turbine guide vane welding fixture as claimed in claim 4, characterized in that: A fixing pin B is arranged on the positioning hole B (24), and the base (1) is positioned and installed with the outer ring A (102) through the fixing pin B. A fixing screw B (20) is arranged on the fixing threaded hole B (25), and the base (1) is connected and fastened to the positioning block (2) through the fixing screw B (20). A load screw (19) is arranged on the load threaded hole A (26), and the base (1) is connected and fastened to the pressure plate (4) through the load screw (19).

6. A low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The shaft (3) is provided with a lower shaft shoulder (301) and an upper shaft shoulder (302); a protruding portion A (29) is provided at one end of the shaft (3), and a protruding portion B (30) is provided at the other end of the shaft (3); the shaft (3) is connected to the base (1) via the protruding portion A (29); the shaft (3) is connected to the positioning plate (5) via the protruding portion B (30); a positioning hole C (31) and a fixing hole B (32) are provided on the lower shaft shoulder (301); and a fixing threaded hole C (33) is provided on the upper shaft shoulder (302).

7. A low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The positioning plate (5) is a spoke-type structure, comprising an inner ring A (501), an outer ring B (502) and a rib plate B (503), wherein the inner ring A (501) is connected to the outer ring B (502) via the rib plate B (503), and the inner ring A (501) is provided with a mounting hole B (34) and a fixing hole C (35), wherein the fixing hole C (35) is arranged around the mounting hole B (34), and a fixing screw B (18) is arranged on the fixing hole C (35). The outer ring B (502) is provided with load threaded holes B (37), and the load threaded holes B (37) are evenly distributed on the circumference of the outer ring B (502). A hook-shaped bolt (11) is provided on the load threaded hole B (37). The top of the hook-shaped bolt (11) passes through the load threaded hole B (37) and is threadedly connected with the load nut (14). A welding handle (36) is provided on the rib plate B (503).

8. A low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The air pipe (12) is an annular structure, and comprises an air guide pipe (38), a pipe joint (39), a semi-ring A (40) and a semi-ring B (41). The air guide pipe (38) and the pipe joint (39) are connected, and the two ends of the semi-ring A (40) are respectively connected to the two ends of the semi-ring B (41) through a nozzle (42), and the end of the nozzle (42) is connected to the air pipe (12) through an air nozzle (43) to form a ventilation circuit. A plurality of fine holes (44) are provided on the semi-ring A (40) and the semi-ring B (41).

9. A low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The cross section of the positioning block (2) is an L-shaped structure, and a positioning hole D (27) and a countersunk fixing hole (28) are provided on the positioning block (2).

10. A method for using the low-pressure turbine guide vane welding fixture as claimed in claim 1, characterized in that: The following steps are involved: S1: Install the positioning block (2) and the shaft (3) on the base (1), and then place the low-pressure turbine guide vane parts on the positioning block (2); S2: Place the pressing plate (4) on the base (1), then place the air pipe (12) into the corresponding groove on the low-pressure turbine guide part, and connect the pipe joint (39) to the external air supply device; S3: Install the hook bolt (11) on the positioning plate (5), then install the positioning plate (5) on the shaft (3), and tighten the hook bolt (11) to the low-pressure turbine guide vane part by twisting the load nut (14), and then start welding.

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