Gas turbine combustor transition section positive and negative face clamping tool

Abstract

The application discloses a transition section positive and negative two-face clamping tool, belongs to the field of gas turbine combustion chamber transition section spraying technology, and comprises a mesa crossbeam, a limiting plate, an inner hexagonal screw, a supporting vertical beam, a crossbeam, a vertical beam, a filling block and other components. Through the structural design of the detachable limiting plate and the wedge-shaped filling block, the accurate positioning and stable clamping of the two installation postures of the transition section round mouth upward and the transition section round mouth downward are realized, and the whole-process spraying operation of the inner wall thermal barrier coating and the wear-resistant coating at both ends of the transition section can be completed by only one set of tool. The tool reduces the tool mounting and dismounting times and the tool quantity, eliminates the overturning positioning deviation, improves the spraying efficiency and the coating quality, reduces the production and management costs, and the wedge-shaped filling block and the detachable limiting plate can be adapted to transition sections of different sizes, are wide in adaptability, and are suitable for the gas turbine combustion chamber transition section spraying operation scene.

Description

Technical Field

[0001] This invention relates to the field of spraying technology for the transition section of a gas turbine combustion chamber, specifically a clamping fixture for the front and back sides of the transition section of a gas turbine combustion chamber. Background Technology

[0002] The transition section of the gas turbine combustion chamber is a complex irregular structure that gradually changes from a circle to a square. It is a key component connecting the flame tube and the turbine. The inner wall needs to be coated with a thermal barrier coating using plasma spraying, and the two ends need to be coated with a wear-resistant coating using supersonic flame spraying.

[0003] In the existing technology, to complete the spraying of the two types of coatings in the transition section, it is necessary to use 2-3 sets of special tooling for step-by-step operation. The specific process is as follows: first, install the plasma spraying tooling to complete the spraying of the inner wall thermal barrier coating, remove it and replace it with the supersonic spraying tooling to spray the front ring wear-resistant coating, then flip the transition section and re-clamp the tooling to complete the spraying of the installation edge wear-resistant coating.

[0004] The existing process has obvious technical problems: First, the repeated assembly and disassembly of the tooling not only results in low spraying efficiency, but also easily causes the workpiece in the transition section to be bumped and damaged; Second, the design, processing and management costs of multiple sets of tooling are high, increasing production input; Third, manually flipping the transition section and re-clamping it can easily cause positioning deviations, which directly affect the coating spraying accuracy and quality.

[0005] Therefore, a clamping fixture for the transition section of the gas turbine combustion chamber is needed, which can be used to hold both sides of the transition section. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a clamping fixture for both sides of the transition section. Through structural optimization, it achieves precise positioning and stable clamping of both sides of the transition section. Only one set of fixtures is needed to complete the entire process of spraying thermal barrier coating and wear-resistant coating, simplifying the operation process, reducing the number of fixtures, improving spraying efficiency and positioning accuracy, and reducing production and management costs.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A clamping fixture for the transition section of a gas turbine combustion chamber, characterized in that: through the detachable setting of the limiting plate and the gap filling of the wedge-shaped filler block, bidirectional positioning of the transition section with the round opening facing upward and downward is achieved, which is compatible with plasma spraying and supersonic flame spraying processes.

[0008] Preferably, there are four limiting plates, which are detachably fixed to the crossbeam of the table by eight hexagon socket screws to limit the sliding displacement of the transition section.

[0009] Preferably, the filler block is a wedge-shaped structure, with a total of 2 pieces, used to fill the gap between the transition section and the supporting vertical beam to achieve lateral fixation of the transition section.

[0010] Preferably, each of the four crossbeams, four vertical beams, four crossbeams, and four vertical beams is made of hot-rolled equilateral angle steel welded to form a tooling frame, with a weld leg height of 5-8mm and sharp edges be blunted.

[0011] Preferably, there are 4 crossbeams on the table, and the surface is machined with positioning lines with a tolerance of ±0.1mm, which serve as the positioning reference for the transition section.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Integrated design improves work efficiency: Only one set of tooling is needed to complete the spraying of thermal barrier coating and wear-resistant coating on both sides of the transition section. There is no need to repeatedly change tooling, reducing the number of workpiece assembly and disassembly times by more than 50%, which greatly improves the efficiency of spraying operations. 2. Precise positioning to ensure coating quality: Through the coordinated operation of the table beam positioning line, the limiting plate, and the wedge-shaped filler, a unified reference positioning is achieved for the two installation postures of the transition section, eliminating the positioning deviation caused by flipping and reinstallation, and ensuring the accuracy and consistency of coating spraying. 3. Reduce the number of tooling and lower overall costs: One set of tooling replaces 2-3 sets of original dedicated tooling, reducing the number of tooling by 60%, which significantly reduces the design and processing costs of tooling, while simplifying the tooling storage, maintenance and management process, and reducing subsequent management costs; 4. Wide adaptability to meet the needs of multiple scenarios: The wedge-shaped filler can flexibly fill different gaps, and the limiting plate is a detachable structure that can adapt to the clamping requirements of transition sections of different sizes and specifications. At the same time, the optional embodiments can be adapted to different spraying equipment, thus improving the applicability of the tooling. Attached Figure Description

[0013] Figure 1 Installation diagram with the transition section's round opening facing downwards; Figure 2 Design drawing of the front of the tooling; Figure 3 Installation diagram with the transition section's round opening facing upwards; Figure 4 Install the A-direction view with the round opening facing downwards; Figure 5 Install the B-direction view with the round opening facing upwards; In the diagram: 1. Tabletop beam; 2. Limiting plate; 3. Hex socket head cap screw; 4. Supporting vertical beam; 5. Beam 1; 6. Vertical beam 1; 7. Beam 2; 8. Vertical beam 2; 9. Filler block. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0015] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0017] Example Please see Figure 1-5 The present invention provides the following technical solution: A clamping fixture for the transition section of a gas turbine combustion chamber, characterized in that: through the detachable setting of the limiting plate 2 and the gap filling of the wedge-shaped filler block 9, bidirectional positioning of the transition section with the round opening facing upward and the round opening facing downward is achieved, which is compatible with plasma spraying and supersonic flame spraying processes.

[0018] Specifically: There are 4 limiting plates 2 in total, which are detachably fixed to the crossbeam 1 of the table by 8 hexagon socket screws 3, and are used to limit the sliding displacement of the transition section.

[0019] Specifically: The filler block 9 is a wedge-shaped structure, with a total of 2 pieces, used to fill the gap between the transition section and the supporting vertical beam 4, so as to achieve lateral fixation of the transition section.

[0020] Specifically: each of the four crossbeams 1-5, vertical beam 1-6, crossbeam 2-7, and vertical beam 2-8 is made of hot-rolled equilateral angle steel welded to form a tooling frame, with a weld leg height of 5-8mm and sharp edges be blunted.

[0021] Specifically: There are 4 tabletop beams 1 in total, and the surface is machined with positioning lines with a tolerance of ±0.1mm, which serve as the positioning reference for the transition section.

[0022] Working principle This fixture achieves precise clamping of two installation postures for the transition section by switching the component installation state, adapting to different coating spraying processes. The specific working modes are as follows: 1. Round opening facing down mode (adapted to wear-resistant coating spraying on the mounting edge): Remove the limiting plates on both sides of the table beam, place the transition section with the round opening facing down on the table beam, align the front ring mounting edge with the positioning line on the table beam, fill the gap between the transition section and the support vertical beam with wedge-shaped filler blocks, and achieve lateral fixation and overall positioning of the transition section through the cooperation of the support vertical beam and the filler blocks. 2. Round opening facing upward mode (suitable for thermal barrier coating and front ring wear-resistant coating spraying): The limiting plate is re-fixed to the table beam with hexagonal screws. The square end of the transition section is placed on the table beam with the square end facing downward, so that the transition section coincides with the positioning line. The mounting edge is clamped by the clamp, and the limiting plate is used to achieve precise positioning and stable clamping of the transition section, without tooling obstructing the spraying area.

[0023] Tooling manufacturing 1. The tooling frame is welded using hot-rolled equal angle steel, with the weld leg height controlled between 5 and 8 mm. After welding, all sharp edges are blunted to ensure the structural strength and operational safety of the frame. 2. Machining the tabletop beam, precisely machining positioning lines on its surface, with the positioning line tolerance controlled within ±0.1mm, fixing the tabletop beam, supporting vertical beams, and the welded frame to form the main fixture body; 3. Reserve mounting holes for the tabletop beam screws, connect the limiting plate to the tabletop beam using hexagonal screws, prepare matching wedge-shaped filler blocks, and complete the overall tooling manufacturing.

[0024] Spraying operation process 1. Clamping and spraying with the round opening facing upward: Fix the four limiting plates to the designated position on the table beam with hex screws. Place the transition section with the square end facing down on the table beam, making sure that the transition section is precisely aligned with the positioning line. Clamp the installation edge of the transition section with clamps. After confirming that the clamping is stable, perform the spraying operations of the inner wall thermal barrier coating (plasma spraying) and the front ring wear-resistant coating (supersonic flame spraying) in sequence. 2. Clamping and spraying with the round opening facing down: After spraying, loosen the clamp, remove the limiting plate on the table beam, flip the transition section so that the round opening faces down, place it on the table beam and align the front ring mounting edge with the positioning line, symmetrically fill the gap between the transition section and the two side support vertical beams with two wedge-shaped filler blocks, and after positioning, carry out the spraying operation of the wear-resistant coating (supersonic flame spraying) on ​​the mounting edge; 3. Tooling adaptation and expansion: For transition sections of different sizes and specifications, wedge-shaped fillers of different thicknesses and limit plates of matching sizes can be replaced without remanufacturing the entire tooling, achieving rapid adaptation.

[0025] In this embodiment, the clamping fixture includes a table beam 1, a limiting plate 2, hexagon socket screws 3, a supporting vertical beam 4, a first horizontal beam 5, a first vertical beam 6, a second horizontal beam 7, a second vertical beam 8, and a filler block 9. The first horizontal beam 5, the first vertical beam 6, the second horizontal beam 7, and the second vertical beam 8 are welded together to form the fixture frame, serving as the load-bearing foundation structure of the entire clamping fixture. Four pieces of each of the first horizontal beam 5, the first vertical beam 6, the second horizontal beam 7, and the second vertical beam 8 are provided, all made of hot-rolled equilateral angle steel and connected by welding to form an integral frame. The weld leg height is 5 to 8 mm. After welding, the sharp edges of each part are blunted to ensure the overall structural strength and operational safety of the fixture.

[0026] Four crossbeams 1 are installed on the upper part of the tooling frame and are used to directly support the transition section of the gas turbine combustion chamber. The surface of the crossbeams 1 is machined with positioning lines, which serve as positioning references when clamping the transition section. The machining tolerance is controlled to ±0.1 mm to ensure that the transition section can achieve accurate centering and repeatable positioning under different clamping postures.

[0027] Four limiting plates 2 are provided, which are detachably fixed to the table beam 1 by eight hexagon socket screws 3. The limiting plates 2 are mainly used to limit the sliding displacement of the transition section when the round opening is facing upward, thereby achieving reliable positioning and stable clamping of the transition section. The support beams 4 are set on both sides of the fixture to provide lateral support when the transition section is in the round opening facing downward. Two filler blocks 9 are provided, which adopt a wedge structure to fill the gap between the transition section and the support beams 4, and achieve lateral fixation of the transition section through wedge tightening.

[0028] In this embodiment, the clamping fixture, through the switching of the limiting plate 2 and the gap filling of the wedge-shaped filler block 9, allows the same set of fixtures to adapt to both forward and reverse installation postures in the transition section, eliminating the need for multiple sets of dedicated fixtures for different spraying areas. Compared with the prior art, this embodiment can reduce the number of fixture changes, reduce positioning errors generated during clamping and flipping, improve spraying efficiency and quality, and reduce fixture manufacturing and management costs.

[0029] In addition, the quantity and size of the platform beam 1, limiting plate 2, supporting vertical beam 4 and filling block 9 described in this embodiment can be adaptively adjusted according to the actual structure of the transition section of the combustion chamber of different gas turbines. As long as the detachable limiting plate and the wedge-shaped filling block are still used to achieve dual-position clamping and positioning, they should all be considered to fall within the protection scope of this invention.

[0030] The clamping fixture described in this embodiment adopts an integrated design, requiring only one set of fixtures to complete the spraying of the thermal barrier coating and wear-resistant coating on both sides of the transition section. This eliminates the need for repeated fixture changes between different spraying processes, significantly reducing the number of workpiece assembly / disassembly operations and improving spraying efficiency. Simultaneously, the coordinated operation of the positioning lines, limiting plates, and wedge-shaped fillers on the table beam achieves unified reference positioning for the transition section in both upward and downward mounting orientations, effectively reducing positioning deviations caused by flipping and re-clamping, and ensuring the accuracy and consistency of the coating spraying. Furthermore, this fixture can replace two to three sets of original dedicated fixtures with a single structure, thereby reducing the design, processing, storage, maintenance, and management costs of the fixture. Moreover, the wedge-shaped fillers can be flexibly adjusted according to different gaps, and the limiting plates have a detachable structure, adaptable to the clamping requirements of transition sections of different sizes and specifications. Combined with optional equipment mounting structures, it can also be adapted to different spraying equipment, thus possessing good applicability and promotional value.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A clamping fixture for the transition section of a gas turbine combustion chamber, comprising a platform beam (1), a limiting plate (2), hexagon socket screws (3), a supporting vertical beam (4), a first beam (5), a first vertical beam (6), a second beam (7), a second vertical beam (8), and a filler block (9), characterized in that: By using the detachable setting of the limiting plate (2) and the gap filling of the wedge-shaped filler (9), the two-way positioning of the transition section with the round opening facing up and the round opening facing down can be achieved, which is compatible with plasma spraying and supersonic flame spraying processes.

2. The clamping fixture for the transition section of a gas turbine combustion chamber on both sides according to claim 1, characterized in that: The limiting plate (2) consists of 4 pieces, which are detachably fixed to the table beam (1) by 8 hexagonal screws (3) to limit the sliding displacement of the transition section.

3. The clamping fixture for the transition section of a gas turbine combustion chamber according to claim 1, characterized in that: The filler block (9) is a wedge-shaped structure, with a total of 2 pieces, used to fill the gap between the transition section and the supporting vertical beam (4) to achieve lateral fixation of the transition section.

4. The clamping fixture for the transition section of a gas turbine combustion chamber according to claim 1, characterized in that: The four pieces of each of the first horizontal beam (5), the first vertical beam (6), the second horizontal beam (7), and the second vertical beam (8) are all made of hot-rolled equilateral angle steel welded to form a tooling frame. The weld leg height is 5-8mm, and the sharp edges are blunted.

5. The clamping fixture for the transition section of a gas turbine combustion chamber according to claim 1, characterized in that: The tabletop beams (1) consist of 4 pieces, with positioning lines machined on the surface. The positioning line tolerance is ±0.1mm, which serve as the positioning reference for the transition section.

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