Welding positioning tool for flame tube and cross flame tube of steam turbine

Abstract

The utility model relates to the technical field of welding, in particular to an assembling and welding positioning tool for a turbine flame tube and a cross flame tube. In order to solve the problems that the angle requirement between a cross flame tube and the wall of a flame tube cannot be met due to the fact that the cross flame tube is manually held and welded on the outer wall of the flame tube, the flame tube is easy to deform in the welding process, and the follow-up assembly quality is low, in the prior art, the cross flame tube is manually held and welded on the outer wall of the flame tube. The bottom plate 1 and the top plate 7 are symmetrically arranged in a vertically opposite and parallel mode, the four corners of the bottom plate 1 and the four corners of the top plate 7 are connected through studs 9 respectively, the top of each stud 9 is sequentially provided with a locking nut 10 and a gasket 8 from top to bottom, a second positioning shaft 11 is arranged in the middle of the lower surface of the top plate 7, and a first positioning shaft 2 is arranged in the middle of the upper surface of the bottom plate 1. A positioning assembly A14, a positioning assembly B15, a positioning assembly C16, a positioning assembly D17, a positioning assembly E18 and a positioning assembly F19 are sequentially arranged on the upper surface of the bottom plate 1 in the circumferential direction. The device is suitable for the technical field of flame tube welding.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding positioning tool for a flame tube cross-flame tube of a steam turbine. Background Art

[0002] At present, the flame tube in the steam turbine is a thin-walled part, and multiple cross-flame tubes need to be welded on the outer surface of the flame tube. There are certain angle requirements between the cross-flame tube and the flame tube wall. Since the cross-flame tube is manually held and welded to the outer wall of the flame tube, the angle requirement between the cross-flame tube and the flame tube wall cannot be met. The flame tube itself is a thin-walled part, which causes the cross-flame tube to be severely deformed during welding, which leads to low subsequent assembly quality.

[0003] In summary, the existing method of manually holding the cross-flame tube and welding it to the outer wall of the flame tube fails to meet the angle requirement between the cross-flame tube and the flame tube wall. The flame tube is easily deformed during the welding process, which leads to the problem of low subsequent assembly quality. Utility Model Content

[0004] The utility model proposes a welding positioning tool for the cross-flame tube of a steam turbine flame tube to solve the problem that the existing cross-flame tube is welded on the outer wall of the flame tube by manually holding, resulting in the failure to meet the angle requirement between the cross-flame tube and the flame tube wall, the flame tube is easily deformed during the welding process, and the subsequent assembly quality is low.

[0005] The utility model is a welding and positioning tool for a flame tube and a flame tube of a steam turbine, which comprises a bottom plate 1, a first positioning shaft 2, a top plate 7, a washer 8, a stud bolt 9, a locking nut 10, a second positioning shaft 11, a positioning assembly A14, a positioning assembly B15, a positioning assembly C16, a positioning assembly D17, a positioning assembly E18 and a positioning assembly F19;

[0006] The bottom plate 1 and the top plate 7 are arranged parallel and symmetrically up and down, and the four corners of the bottom plate 1 and the top plate 7 are connected by stud bolts 9 respectively, and the top of each stud bolt 9 is provided with a locking nut 10 and a washer 8 in sequence from top to bottom, a second positioning shaft 11 is provided in the middle of the lower surface of the top plate 7, a first positioning shaft 2 is provided in the middle of the upper surface of the bottom plate 1, and the upper surface of the bottom plate 1 is provided with positioning components A14, positioning components B15, positioning components C16, positioning components D17, positioning components E18 and positioning components F19 in sequence along the circumferential direction;

[0007] Furthermore, the second positioning shaft 11 is fixedly connected to the middle part of the lower surface of the top plate 7 by bolts;

[0008] Furthermore, the first positioning shaft 2 is fixedly connected to the middle of the upper surface of the bottom plate 1 by bolts;

[0009] Further, the mechanical structures of the positioning assembly A14, positioning assembly B15, positioning assembly C16, positioning assembly D17, positioning assembly E18 and positioning assembly F19 are the same;

[0010] Further, the positioning assembly A14 includes a positioning pin 3, a knurled set screw 4 and a support 5; a through hole is processed on the upper side of the support 5, and a positioning pin 3 is arranged inside the through hole, the positioning pin 3 is slidably connected with the through hole on the support 5, a threaded hole is arranged in the middle of the top surface of the support 5, and a knurled set screw 4 is arranged inside the threaded hole;

[0011] Furthermore, one end of the bottom surface of the support 5 is positioned and connected to the bottom plate 1 through a positioning pin 6, and the other end of the bottom surface of the support 5 is fixedly connected to the bottom plate 1 through a fixing bolt;

[0012] Furthermore, the axis of the positioning pin 3 in the positioning component E18 is set at an angle of ɑ° to the side of the support 5; the axis of the positioning pin 3 in the positioning component B15 is set at an angle of β° to the side of the support 5; the axis of the positioning pin 3 in the positioning component A14 is set perpendicular to the side of the support 5; the axis of the positioning pin 3 in the positioning component F19 is set at an angle of γ° to the side of the support 5;

[0013] Furthermore, the positioning assembly F19 further includes a clamping plate 12 and a slotted cylindrical head screw 13; the clamping plate 12 is sleeved on the positioning pin 3, and a threaded hole is processed on the circumferential outer surface of the positioning pin 3, and the clamping plate 12 is fixedly connected to the threaded hole on the positioning pin 3 through the slotted cylindrical head screw 13;

[0014] Furthermore, the 5≤ɑ, β, γ≤100;

[0015] Furthermore, the positioning assembly F19 is arranged at the middle of one end of the upper surface of the bottom plate 1;

[0016] Furthermore, when in use, the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, by adjusting the locking nuts 10 on the four stud bolts 9, the bottom plate 1 and the top plate 7 are axially positioned and clamped on the flame tube; and the upper surface of the bottom plate 1 is provided with positioning components A14, positioning components B15, positioning components C16, positioning components D17, positioning components E18 and positioning components D19 in sequence along the circumferential direction. Positioning assembly F19, since the structures of the six groups of positioning assemblies are roughly the same, the axis of the positioning pin 3 in the positioning assembly E18 is set at an angle of ɑ° with the side of the support 5; the axis of the positioning pin 3 in the positioning assembly B15 is set at an angle of β° with the side of the support 5; the axis of the positioning pin 3 in the positioning assembly A14 is set perpendicular to the side of the support 5; the axis of the positioning pin 3 in the positioning assembly F19 is set at an angle of γ° with the side of the support 5; at this time, the angles of ɑ, β, and γ can be determined according to the design requirements. After confirmation, the six groups of positioning components are fixed on the upper surface of the base plate 1 through the positioning pins and fixing bolts, and the cross-flame tube is sleeved on the positioning pin 3, and the positioning pin 3 is used to slide and connect with the through hole on the support 5. By adjusting the expansion and contraction amount of the positioning pin 3, the end of the cross-flame tube is made to contact with the outer surface of the flame tube. At this time, the knurled locking screw 4 is locked to achieve the tightening effect of the positioning pin 3; finally, the multiple cross-flame tubes are welded one by one, thereby completing the welding operation of the multiple cross-flame tubes and the outer wall of the flame tube; using this structure of welding tooling The cross-flame tube and the outer wall of the flame tube are welded to meet the angle requirement between the cross-flame tube and the flame tube wall; and the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, the locking nuts 10 on the four stud bolts 9 are adjusted to allow the bottom plate 1 and the top plate 7 to axially position and clamp the flame tube; thus avoiding deformation of the flame tube during welding, thereby improving the quality of subsequent assembly.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model overcomes the shortcomings of the prior art, places the flame tube between the bottom plate and the top plate, and because the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft, and the top of the flame tube is sleeved on the No. 2 positioning shaft, and then the locking nuts on the four stud bolts are adjusted to allow the bottom plate and the top plate to axially position and clamp the flame tube; thus, deformation of the flame tube during welding is avoided, thereby improving the quality of subsequent assembly;

[0019] Then, the upper surface of the bottom plate is provided with positioning components A, positioning components B, positioning components C, positioning components D, positioning components E and positioning components F in sequence along the circumferential direction. Since the structures of the six groups of positioning components are roughly the same, the axis of the positioning pin in the positioning component E is set at an angle of ɑ° with the side surface of the support; the axis of the positioning pin in the positioning component B is set at an angle of β° with the side surface of the support; the axis of the positioning pin in the positioning component A is set perpendicular to the side surface of the support; the axis of the positioning pin in the positioning component F is set at an angle of α° with the side surface of the support. The side faces are set at an angle of γ°; at this time, the angles of ɑ, β, and γ can be determined according to the design requirements of the drawings. After determination, the six groups of positioning components are fixed to the upper surface of the base plate through positioning pins and fixing bolts, and the cross-flame tube is sleeved on the positioning pins, and the positioning pins are used to slide in connection with the through holes on the support. By adjusting the telescopic amount of the positioning pins, the end of the cross-flame tube is made to contact the outer surface of the flame tube. At this time, the knurled locking screw is locked to achieve the tightening effect of the positioning pin, thereby meeting the angle requirement between the cross-flame tube and the flame tube wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a welding and positioning tool for a flame tube and cross-flame tube of a steam turbine described in the utility model;

[0021] Figure 2 It is a top view of a bottom plate in a welding and positioning tool for a flame tube and cross-flame tube of a steam turbine described in the utility model;

[0022] Figure 3 yes Figure 2 The BB section view of a positioning assembly E in a positioning tool for welding and positioning a flame tube and a cross-flame tube of a steam turbine described in the utility model;

[0023] Figure 4 yes Figure 2 A CC cross-sectional view of a positioning assembly B in a welding positioning tool for a steam turbine flame tube and cross-flame tube according to the utility model;

[0024] Figure 5 yes Figure 2 A DD cross-sectional view of a positioning assembly A in a welding positioning tool for a steam turbine flame tube and cross-flame tube according to the utility model;

[0025] Figure 6 The utility model discloses a structural diagram of a welding and positioning tool for a flame tube and a cross-flame tube of a steam turbine. DETAILED DESCRIPTION

[0026] Specific implementation method 1: Combination Figure 1 , Figure 2 and Figure 6The present embodiment is described. The present embodiment is a kind of positioning tool for welding a flame tube of a steam turbine, which comprises a bottom plate 1, a first positioning shaft 2, a top plate 7, a washer 8, a stud bolt 9, a locking nut 10, a second positioning shaft 11, a positioning assembly A14, a positioning assembly B15, a positioning assembly C16, a positioning assembly D17, a positioning assembly E18 and a positioning assembly F19;

[0027] The bottom plate 1 and the top plate 7 are arranged parallel and symmetrically up and down, and the four corners of the bottom plate 1 and the top plate 7 are connected by stud bolts 9 respectively, and the top of each stud bolt 9 is provided with a locking nut 10 and a washer 8 in sequence from top to bottom, a second positioning shaft 11 is provided in the middle of the lower surface of the top plate 7, a first positioning shaft 2 is provided in the middle of the upper surface of the bottom plate 1, and the upper surface of the bottom plate 1 is provided with positioning components A14, positioning components B15, positioning components C16, positioning components D17, positioning components E18 and positioning components F19 in sequence along the circumferential direction;

[0028] In this specific implementation mode, when in use, the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, by adjusting the locking nuts 10 on the four stud bolts 9, the bottom plate 1 and the top plate 7 are axially positioned and clamped on the flame tube; and the upper surface of the bottom plate 1 is provided with positioning components A14, positioning components B15, positioning components C16, positioning components D17, and positioning components E1 in sequence along the circumferential direction. 8 and positioning components F19, since the structures of the six groups of positioning components are roughly the same, the axis of the positioning pin 3 in the positioning component E18 is set at an angle of ɑ° with the side of the support 5; the axis of the positioning pin 3 in the positioning component B15 is set at an angle of β° with the side of the support 5; the axis of the positioning pin 3 in the positioning component A14 is set perpendicular to the side of the support 5; the axis of the positioning pin 3 in the positioning component F19 is set at an angle of γ° with the side of the support 5; at this time, the angles of ɑ, β, and γ can be adjusted according to design requirements. After confirmation, the six positioning components are fixed on the upper surface of the bottom plate 1 through the positioning pins and the fixing bolts, and the cross-flame tube is sleeved on the positioning pins 3, and the positioning pins 3 are slidably connected with the through holes on the support 5. By adjusting the expansion and contraction amount of the positioning pins 3, the end of the cross-flame tube is brought into contact with the outer surface of the flame tube. At this time, the knurled set screws 4 are locked to achieve the tightening effect of the positioning pins 3; finally, the multiple cross-flame tubes are welded one by one, thereby completing the welding operation of the multiple cross-flame tubes and the outer wall of the flame tube; the welding tool using this structure The cross-flame tube is welded to the outer wall of the flame tube to meet the angle requirement between the cross-flame tube and the flame tube wall; and the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, the locking nuts 10 on the four stud bolts 9 are adjusted to allow the bottom plate 1 and the top plate 7 to axially position and clamp the flame tube; thus avoiding deformation of the flame tube during welding, thereby improving the quality of subsequent assembly.

[0029] Specific implementation method 2: Combination Figure 1 , Figure 2 and Figure 6 To explain this embodiment, this embodiment is a further limitation of the tooling described in the specific embodiment 1. This embodiment describes a tooling for welding and positioning the flame tube and cross-flame tube of a steam turbine, wherein the second positioning shaft 11 is fixedly connected to the middle part of the lower surface of the top plate 7 by bolts.

[0030] Specific implementation method three: Combination Figure 1 , Figure 2 and Figure 6To explain this embodiment, this embodiment is a further limitation of the tooling described in the specific embodiment 1. This embodiment describes a tooling for welding and positioning the flame tube and cross-flame tube of a steam turbine, wherein the No. 1 positioning shaft 2 is fixedly connected to the middle of the upper surface of the base plate 1 by bolts.

[0031] Specific implementation method four: Combination Figures 1 to 6 This embodiment is described as a further limitation of the tooling described in the specific embodiment 1. This embodiment is a tooling for welding and positioning the flame tube and cross-flame tube of a steam turbine, wherein the positioning assembly A14, the positioning assembly B15, the positioning assembly C16, the positioning assembly D17, the positioning assembly E18 and the positioning assembly F19 have the same mechanical structure.

[0032] Specific implementation method five: Combination Figures 1 to 6 The present embodiment is described. The present embodiment is a further limitation on the tooling described in the fourth specific embodiment. The present embodiment describes a tooling for the welding and positioning of the flame tube and the flame linking tube of a steam turbine. The positioning assembly A14 comprises a positioning pin 3, a knurled locking screw 4 and a support 5. A through hole is processed on the upper part of the side surface of the support 5, and a positioning pin 3 is provided inside the through hole. The positioning pin 3 is slidably connected to the through hole on the support 5. A threaded hole is provided in the middle of the top surface of the support 5, and a knurled locking screw 4 is provided inside the threaded hole.

[0033] Specific implementation method six: Combination Figures 1 to 6 To explain this embodiment, this embodiment is a further limitation of the tooling described in the specific embodiment five. This embodiment describes a tooling for welding and positioning the flame tube and cross-flame tube of a steam turbine, wherein one end of the bottom surface of the support 5 is positioned and connected to the base plate 1 through a positioning pin 6, and the other end of the bottom surface of the support 5 is fixedly connected to the base plate 1 through a fixing bolt.

[0034] Specific implementation method seven: Combination Figures 1 to 6 This embodiment is described. This embodiment is a further limitation of the tooling described in the specific embodiment 5. In this embodiment, a positioning tooling for the installation and welding of the flame tube and cross-flame tube of a steam turbine is described. The axis of the positioning pin 3 in the positioning assembly E18 is set at an angle of ɑ° with the side surface of the support 5; the axis of the positioning pin 3 in the positioning assembly B15 is set at an angle of β° with the side surface of the support 5; the axis of the positioning pin 3 in the positioning assembly A14 is set perpendicular to the side surface of the support 5; the axis of the positioning pin 3 in the positioning assembly F19 is set at an angle of γ° with the side surface of the support 5;

[0035] In this specific embodiment, the upper surface of the bottom plate is provided with positioning components A, positioning components B, positioning components C, positioning components D, positioning components E and positioning components F in sequence along the circumferential direction. Since the structures of the six groups of positioning components are roughly the same, the axis of the positioning pin in the positioning component E is set at an angle of ɑ° with the side surface of the support; the axis of the positioning pin in the positioning component B is set at an angle of β° with the side surface of the support; the axis of the positioning pin in the positioning component A is set perpendicular to the side surface of the support; the axis of the positioning pin in the positioning component F is set at an angle of β° with the side surface of the support; It is set at an angle of γ° with the side of the support; at this time, the angles of ɑ, β, and γ can be determined according to the design requirements of the drawing. After determination, the six groups of positioning components are fixed to the upper surface of the base plate through positioning pins and fixing bolts, and the cross-flame tube is sleeved on the positioning pins, and the positioning pins are used to slide in connection with the through holes on the support. By adjusting the expansion and contraction of the positioning pins, the end of the cross-flame tube is brought into contact with the outer surface of the flame tube. At this time, the knurled locking screw is locked to achieve the tightening effect of the positioning pin, thereby meeting the angle requirement between the cross-flame tube and the flame tube wall.

[0036] Specific implementation method eight: Combination Figures 1 to 6 The present embodiment is described as a further limitation of the tooling described in the fifth specific embodiment. The present embodiment describes a tooling for welding and positioning a flame tube and a flame linking tube of a steam turbine. The positioning assembly F19 also includes a clamping plate 12 and a slotted cylindrical head screw 13. The clamping plate 12 is sleeved on the positioning pin 3, and a threaded hole is machined on the circumferential outer surface of the positioning pin 3. The clamping plate 12 is fixedly connected to the threaded hole on the positioning pin 3 by the slotted cylindrical head screw 13.

[0037] Specific implementation method nine: Combination Figures 1 to 6 This embodiment is described as a further limitation of the tooling described in Specific Embodiment 7. This embodiment is a tooling for welding and positioning the flame tube and cross-flame tube of a steam turbine, wherein the values ​​of ɑ, β, and γ are all in the range of 5 to 100.

[0038] Specific implementation method ten: Combination Figures 1 to 6 This embodiment is described as a further limitation of the tooling described in the first embodiment. This embodiment is a tooling for welding and positioning a flame tube and a cross-flame tube of a steam turbine, wherein the positioning assembly F19 is disposed in the middle of one end of the upper surface of the base plate 1.

[0039] How it works

[0040] When in use, the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, by adjusting the locking nuts 10 on the four stud bolts 9, the bottom plate 1 and the top plate 7 are used to axially position and clamp the flame tube; and the upper surface of the bottom plate 1 is provided with positioning components A14, positioning components B15, positioning components C16, positioning components D17, positioning components E18 and positioning components in the circumferential direction in sequence. F19, since the structures of the six groups of positioning components are roughly the same, the axis of the positioning pin 3 in the positioning component E18 is set at an angle of ɑ° with the side of the support 5; the axis of the positioning pin 3 in the positioning component B15 is set at an angle of β° with the side of the support 5; the axis of the positioning pin 3 in the positioning component A14 is set perpendicular to the side of the support 5; the axis of the positioning pin 3 in the positioning component F19 is set at an angle of γ° with the side of the support 5; at this time, the angles of ɑ, β, and γ can be determined according to the design requirements. After confirmation, the six positioning components are fixed on the upper surface of the base plate 1 through the positioning pins and fixing bolts, and the cross-flame tube is sleeved on the positioning pin 3, and the positioning pin 3 is used to slide and connect with the through hole on the support 5. By adjusting the expansion and contraction amount of the positioning pin 3, the end of the cross-flame tube is made to contact with the outer surface of the flame tube. At this time, the knurled locking screw 4 is locked to achieve the tightening effect of the positioning pin 3; finally, the multiple cross-flame tubes are welded one by one, thereby completing the welding operation of the multiple cross-flame tubes and the outer wall of the flame tube; the welding tooling with this structure is used for The cross-flame tube is welded to the outer wall of the flame tube to meet the angle requirement between the cross-flame tube and the flame tube wall; and the flame tube is placed between the bottom plate 1 and the top plate 7. Since the flame tube is a thin-walled cylindrical part, the bottom of the flame tube is sleeved on the No. 1 positioning shaft 2, and the top of the flame tube is sleeved on the No. 2 positioning shaft 11. Then, by adjusting the locking nuts 10 on the four stud bolts 9, the bottom plate 1 and the top plate 7 are used to axially position and clamp the flame tube; thus avoiding deformation of the flame tube during welding, thereby improving the quality of subsequent assembly.

Claims

1. A welding and positioning tool for the flame tube and cross-flame tube of a steam turbine. Features: It comprises a bottom plate (1), a first positioning shaft (2), a top plate (7), a washer (8), a stud bolt (9), a locking nut (10), a second positioning shaft (11), a positioning assembly A (14), a positioning assembly B (15), a positioning assembly C (16), a positioning assembly D (17), a positioning assembly E (18) and a positioning assembly F (19); The bottom plate (1) and the top plate (7) are arranged parallel and symmetrically in the upper and lower parts, and the bottom plate (1) and the top plate (7) are connected at four corners by stud bolts (9), and the top of each stud bolt (9) is provided with a locking nut (10) and a washer (8) in sequence from top to bottom, a second positioning shaft (11) is provided in the middle of the lower surface of the top plate (7), a first positioning shaft (2) is provided in the middle of the upper surface of the bottom plate (1), and a positioning assembly A (14), a positioning assembly B (15), a positioning assembly C (16), a positioning assembly D (17), a positioning assembly E (18) and a positioning assembly F (19) are provided in sequence along the circumferential direction on the upper surface of the bottom plate (1).

2. A tool for welding and positioning a steam turbine flame tube and a cross-fire tube according to claim 1, Features: The second positioning shaft (11) is fixedly connected to the middle part of the lower surface of the top plate (7) by means of bolts.

3. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 1, Features: The No. 1 positioning shaft (2) is fixedly connected to the middle part of the upper surface of the base plate (1) via bolts.

4. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 1, Features: The mechanical structures of the positioning assembly A (14), positioning assembly B (15), positioning assembly C (16), positioning assembly D (17), positioning assembly E (18) and positioning assembly F (19) are the same.

5. A welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 4, Features: The positioning assembly A (14) comprises a positioning pin (3), a knurled locking screw (4) and a support (5); a through hole is processed on the upper side of the support (5), and a positioning pin (3) is arranged inside the through hole, the positioning pin (3) is slidably connected to the through hole on the support (5), a threaded hole is arranged in the middle of the top surface of the support (5), and a knurled locking screw (4) is arranged inside the threaded hole.

6. A welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 5, Features: One end of the bottom surface of the support (5) is positioned and connected to the bottom plate (1) via a positioning pin (6), and the other end of the bottom surface of the support (5) is fixedly connected to the bottom plate (1) via a fixing bolt.

7. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 5, Features: The axis of the positioning pin (3) in the positioning component E (18) is set at an angle of ɑ° with the side surface of the support (5); the axis of the positioning pin (3) in the positioning component B (15) is set at an angle of β° with the side surface of the support (5); the axis of the positioning pin (3) in the positioning component A (14) is set perpendicular to the side surface of the support (5); the axis of the positioning pin (3) in the positioning component F (19) is set at an angle of γ° with the side surface of the support (5).

8. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 5, Features: The positioning assembly F (19) further comprises a clamping plate (12) and a slotted cylindrical head screw (13); the clamping plate (12) is sleeved on the positioning pin (3), and a threaded hole is processed on the circumferential outer surface of the positioning pin (3); the clamping plate (12) is fixedly connected to the threaded hole on the positioning pin (3) by the slotted cylindrical head screw (13).

9. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 7, Features: 5≤ɑ,β,γ≤100.

10. The welding and positioning tool for the flame tube and cross-fire tube of a steam turbine according to claim 1, Features: The positioning assembly F (19) is arranged at the middle of one end of the upper surface of the base plate (1).

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