Gas turbine fairing welding positioning clamp

Abstract

The utility model provides a welding and positioning clamp for a gas turbine fairing. The welding and positioning clamp comprises a flange pressing plate A, a mandrel, a pressing plate, an inner pressing nut, a supporting assembly A, a supporting assembly B, a flange pressing plate B and a positioning plate. A flange pressing plate A is mounted at the bottom of the pressing plate; the mandrel is in interference fit with the positioning plate, and the top of the mandrel penetrates through the pressing plate and is fixed through a hexagon nut; the supporting assembly A and the supporting assembly B are tightly attached to the inner wall of the fairing single piece through screwing of the inner pressing nuts. And a flange pressing plate B is mounted on the positioning plate 11. Under the condition that the fairing assembling requirement is met, the welding deformation is controlled, the machining procedure is simplified, the manufacturing period is shortened, and the cost is reduced. The fuel gas fairing welding positioning clamp facilitates assembly positioning and welding assembly, and ensures the assembly quality of butt welding seams and the shape size and position size of each part during assembly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of welding special forming, and particularly relates to a gas turbine fairing welding positioning fixture. BACKGROUND

[0002] In order to uniformly deliver the compressed air discharged by the compressor to the combustion device at the head of the flame tube, a combustion chamber fairing structure is generally adopted, which makes the airflow flow in the required direction, so as to facilitate ignition and combustion, and enables the combustion to continue. The combustion chamber fairing structure is required to have the characteristics of small flow resistance, simple structure, accurate size, safety, reliability and long service life. The combustion chamber fairing structure is concentrically arranged outside the transition section of the flame tube, so that an annular airflow passage is formed between the flame tube, the transition section and the combustion chamber fairing structure. In the combustion chamber, the combustion chamber fairing structure not only plays a flow regulating role to provide the air required for combustion for the head of the flame tube, but also plays a role of cooling the flame tube. The combustion chamber fairing structure assembly of a certain type of engine needs three single pieces to be welded. During welding, the metal in the heated area near the weld and the weld expands. Since the metal around is relatively cold, the expansion is prevented, and compression stress and plastic shrinkage deformation are easily generated in the welding area, resulting in transverse and longitudinal shrinkage of different degrees. During welding of the assembly, after multiple welding thermal cycle actions, if the welding process parameters are not properly controlled and the local temperature is too high, the surface of the material will be oxidized, the corrosion resistance of the joint will be reduced, and in severe cases, the joint and the nearby base material will be overburned, and the corrosion resistance of the metal will be sharply reduced. During the welding process, under the condition of ensuring the quality of the weld, as small heat input as possible is adopted, and multi-layer and multi-pass welding is adopted, and the temperature between the passes is controlled at a low level. The inner wall of the fairing is easily oxidized due to high temperature, and is seriously blackened on the back, so protective measures should be taken for the inner wall of the fairing before welding. In addition, when the fairing structure is welded as a single piece, a welding fixture is used for positioning, and the welded single piece is fixed in a reliable position, so that the deformation of the parts during assembly and welding is solved, the labor intensity of the welder is reduced, and the production efficiency is improved. CONTENT OF THE UTILITY MODEL

[0003] The utility model is aimed at providing a gas turbine fairing welding positioning fixture.

[0004] A gas turbine fairing welding positioning fixture, which comprises a flange pressing plate A, a mandrel, a pressing plate, an inner pressing nut, a support assembly A, a support assembly B, a flange pressing plate B and a positioning plate; the bottom of the pressing plate is provided with the flange pressing plate A; the mandrel is in interference fit with the positioning plate, and the top of the mandrel penetrates through the pressing plate and is fixed by a hexagon nut; the inner pressing nut is screwed to make the support assembly A and the support assembly B tightly adhere to the inner wall of the fairing single piece; the positioning plate 11 is provided with the flange pressing plate B.

[0005] Further, the lower end of the pressing plate is provided with six threaded holes, and the six threaded holes are inserted into hexagonal head screws to assemble with the flange pressing plate A.

[0006] Further, three hoisting holes are processed in the circumferential direction on the upper end of the pressing plate.

[0007] Further, the pressing plate is provided with an argon gas passing hole, which can be shared with the hoisting hole.

[0008] Further, the mandrel is used in cooperation with the cushion block to keep the parts and the tool concentric with the parts.

[0009] Further, the support assembly A is provided with a groove at the front end, so that the argon gas molecules move in the groove when the argon gas passes through, preventing the back of the weld from being oxidized during welding.

[0010] Further, the support assembly A is of a segmented structure, and when the support assembly is not tightly supported, the middle nut of the support assembly A is adjusted according to the assembly state of the parts and the tool.

[0011] Further, the support assembly A and the support assembly B are evenly distributed in the circumferential direction, and when they are tightly attached to the inner wall of the fairing, the stress is evenly distributed.

[0012] Further, the support assembly B adopts a ball head structure for fixation.

[0013] Further, the flange pressing plate B and the positioning plate are fixed by using an internal hexagonal head screw.

[0014] The beneficial effects of the present utility model are as follows:

[0015] (1) The present utility model controls the welding deformation under the condition of meeting the assembly requirements of the fairing, simplifies the machining process, saves the manufacturing period, and reduces the cost. (2) The fairing welding positioning clamp is convenient for assembly positioning and welding assembly, and ensures the assembly quality of the butt weld and the shape size and position size during assembly of each part. (3) The support assembly A adopts a segmented structure, and when the support assembly is not tightly supported, the middle nut of the support assembly A can be adjusted according to the assembly state of the parts and the tool, so that the front end of the support assembly can be elongated and shortened. (4) The argon gas of the present utility model can flow into the tool interior to prevent the weld from being oxidized and improve the weld forming and performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The present utility model is a structural schematic view. DETAILED DESCRIPTION

[0017] The present utility model will be further described below in combination with the drawings.

[0018] As Figure 1As shown, a kind of engine fairing welding positioning fixture, including hexagonal head screw 1, flange pressing plate A2, hexagon nut 3, mandrel 4, pressing plate 5, inner pressing nut 6, support assembly A7, cushion block 8, support assembly B9, flange pressing plate B10, positioning plate 11;

[0019] Pressing plate 5 lower end processes six threaded holes, six threaded holes are inserted into hexagonal head screw 1 and flange pressing plate A2 and are assembled, play fixed role;Pressing plate 5 upper end processes 3 hoisting holes according to circumference, facilitate operator to the hoisting of overall tooling, improve work efficiency;Pressing plate 5 processes argon hole, this hole can be shared with hoisting hole, when welding fairing single piece, make argon can flow into tooling interior, prevent weld oxidation, improve weld forming and performance;

[0020] Hexagon nut 3 is tightened after tooling and part assembly are completed, prevents tooling from sliding, fixes part, mandrel 4 and positioning plate 11 interference fit, cushion block 8 and mandrel 4 are used in cooperation, keep part and tooling and part concentric, guarantee assembly size precision, inner pressing nut 6, by tightening, make support assembly A7 and support assembly B9 close to fairing single piece inner wall, prevent welding structural part from being deformed when welding, support assembly A7 is evenly distributed according to circumference 6, close to fairing single piece inner wall, make it force even, support assembly A7 front end processes a groove, when argon is passed, make argon molecule movement in groove, prevent weld oxidation when welding, support assembly A7 adopts sectional structure, when support assembly is not supported strictly, can adjust middle nut of support assembly A7, according to the assembly state of part and tooling, make support assembly front end can be lengthened and shortened, support assembly B9 is evenly distributed according to circumference 6, close to fairing single piece inner wall, make it force even, support assembly B9, since the position of fairing single piece is arc structure, support assembly B9 front end adopts ball head structure and is fixed, flange pressing plate B10 and positioning plate 11 are fixed using hexagonal head screw.

[0021] The above only preferred embodiment of the present application is described, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A combustion engine cowl welding fixture, comprising: It includes flange pressing plate A (2), mandrel (4), pressing plate (5), inner pressing nut (6), support assembly A (7), support assembly B (9), flange pressing plate B (10) and positioning plate (11); the bottom of the pressing plate (5) is provided with the flange pressing plate A (2); the mandrel (4) is in interference fit with the positioning plate (11), and the top of the mandrel (4) is fixed through the hexagonal nut (3) by penetrating the pressing plate (5); the inner pressing nut (6) is screwed to make the support assembly A (7) and the support assembly B (9) closely adhere to the inner wall of the fairing single piece; the flange pressing plate B (10) is installed on the positioning plate (11).

2. A welding fixture for positioning a fairing for a combustion engine according to claim 1, characterized in that The lower end of the pressing plate (5) is provided with six threaded holes, and the six threaded holes are inserted into the hexagonal cylindrical head screw (1) and assembled with the flange pressing plate A (2).

3. The welding fixture of claim 1, wherein: The upper end of the pressing plate (5) is provided with three hoisting holes in the circumferential direction.

4. A welding fixture for positioning a fairing for a combustion engine according to claim 3, characterized in that The pressing plate (5) is provided with an argon passing hole, and the argon passing hole can be shared with the hoisting hole.

5. The welding fixture of claim 1, wherein: The mandrel (4) is used in cooperation with the cushion block (8) to keep the parts and the tool concentric with the parts.

6. A welding fixture for a cowl of a gas turbine engine as defined in claim 1, wherein The front end of the support assembly A (7) is provided with a groove, so that the argon molecules move in the groove when the argon is passed, preventing the back of the weld from oxidizing during welding.

7. A welding fixture for a cowl of a gas turbine engine as defined in claim 1, wherein The support assembly A (7) is of sectional structure, and when the support assembly is not supported tightly, the middle nut of the support assembly A (7) is adjusted according to the assembly state of the parts and the tool.

8. The welding fixture of claim 1, wherein: The support assembly A (7) and the support assembly B (9) are evenly distributed in the circumferential direction, and when they are closely adhered to the inner wall of the fairing single piece, the stress is evenly distributed.

9. The welding fixture of claim 1, wherein: The support assembly B (9) is fixed by using a ball head structure.

10. The welding fixture of claim 1, wherein: The flange pressing plate B (10) and the positioning plate (11) are fixed by using an inner hexagonal cylindrical head screw.

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