Flame tube repairing and positioning clamp and repairing method

Abstract

The invention discloses a flame tube repairing and positioning clamp and a maintenance method.The flame tube repairing and positioning clamp comprises a supporting assembly used for supporting a flame tube base body; the positioning parts are detachably connected with the supporting assembly and used for positioning the mounting positions of the air inlet hoppers, the positioning parts are matched with the inner contours of the air inlet hoppers, and the end faces of the positioning parts form an axial positioning datum plane used for limiting the mounting height of a new air inlet hopper. According to the method, the air inlet hopper repairing process is optimized, scrapping caused by ablation of the air inlet hopper after the flame tube is used is avoided, cost is saved, and the service life of parts is prolonged.

Description

Technical Field

[0001] This invention relates to the field of aero-engine flame tube repair technology, and more specifically, to a flame tube repair positioning fixture and repair method. Background Technology

[0002] The precisely distributed air intake hoppers on the combustor are key components ensuring its reliable operation. They dominate the flow direction and volume of cooling air, and are crucial for maintaining film cooling efficiency and preventing combustor erosion. However, the air intake hoppers are also vulnerable points that are easily damaged. Erosion, cracking, or deformation are common failure modes of the combustor. The erosion of the outlet edge of the air intake hopper after use varies in degree, affecting the combustion chamber outlet temperature field and consequently the turbine life. Since the air intake hopper welds are brazed, the common repair method involves grinding and polishing away the welds, then knocking the air intake hopper off. This method has problems such as damaging the substrate during grinding, deforming the substrate, or causing cracks in the combustor wall after disassembly, affecting the dimensions and repair success rate. Often, the entire combustor is scrapped due to air intake hopper erosion, resulting in excessive costs and a short component lifespan. Given the high value of the combustor itself, partial replacement and repair of damaged air intake hoppers, rather than complete scrapping, has become an indispensable and cost-effective key maintenance process in engine overhaul.

[0003] However, the repair process of the air intake has long faced a fundamental technical bottleneck: how to ensure that the newly replaced air intake can accurately reproduce the geometric position and spatial attitude of the original design. The installation position, protrusion height, and internal flow direction of the air intake have all undergone rigorous aerodynamic and cooling design calculations. Any slight deviation may lead to local cooling failure, temperature field distortion, and thus premature damage to the flame tube or even a safety accident.

[0004] Before final welding or brazing, the air intake hopper needs to be temporarily spot-welded. Without dedicated clamps, operators often need to manually support it, making it difficult to avoid slight displacement or deflection due to the heat input from spot welding or external forces. Furthermore, the flame tube itself is a thin-walled component; without reliable internal support during repair operations, it is prone to deformation due to its own weight or assembly forces, further affecting positioning accuracy.

[0005] In the existing technology, there is a lack of dedicated fixtures that can systematically solve the above problems. General-purpose fixtures are difficult to adapt to the complex curved surface structure of the flame tube and the special shape of the air intake; while some simple dedicated fixtures are often single-function, either only supporting the tube or only roughly positioning, failing to achieve the integration of "support-positioning", and usually lack convenient adjustability and adaptability, and cannot meet the needs of high-precision, batch, and standardized repair. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a flame tube repair positioning fixture and repair method, which optimizes the inlet bucket repair process, avoids the scrapping of the flame tube due to ablation of the inlet bucket after use, saves costs, and improves the service life of parts.

[0007] To achieve the above objectives, the present invention provides a flame tube repair and positioning fixture, comprising: Support components are used to support the flame tube base; A plurality of positioning elements are provided, each of which is detachably connected to the support assembly for positioning the installation position of each air intake hopper. The positioning elements are adapted to the inner contour of the air intake hopper, and the end face of the positioning elements constitutes an axial positioning reference surface for limiting the installation height of the new air intake hopper.

[0008] In this technical solution, multiple air inlets are connected to the outer wall of the flame tube base by welding. When an air inlet needs repair, the old air inlet must be disassembled, and the flame tube base is placed on a support assembly. The support assembly supports and positions the flame tube base. Then, each new air inlet is accurately placed in its respective mounting position on the flame tube base. Each new air inlet is then positioned using positioning components. The end face of the positioning component forms an axial positioning reference surface that limits the installation height of the new air inlet, ensuring the correct installation position is maintained during the welding process. The positioning components can be removed after the new air inlets are spot-welded and positioned. This invention achieves high-precision positioning of the new air inlets by forming a reliable internal support for the flame tube base and using the flame tube as a reference through detachable positioning components. This avoids damage or deformation of the base during repair, effectively improving the repair pass rate, reducing the scrap rate of the flame tube due to air inlet ablation, saving costs, and extending the service life of parts.

[0009] As a preferred embodiment, the positioning element is a pin adapted to the inner contour of the air intake hopper. The end of the pin forms the axial positioning reference surface used to define the installation height of the new air intake hopper, and one end of the pin passes through the air intake hopper and connects to the support assembly. The reference surface at the end of the pin is precision ground, improving the accuracy of aero-engine maintenance.

[0010] As a preferred embodiment, the support assembly includes a reference block and a support ring. The support ring is detachably connected to the reference block and its shape is adapted to the inner wall of the flame tube base for providing support from inside the flame tube base. One end of the pin is detachably connected to the support ring. The bottom of the flame tube base rests on the reference block, and the support ring extends into the interior of the flame tube base. The height of the support ring is adapted to the mounting height of the air inlet hopper on the flame tube base.

[0011] As a preferred embodiment, the outer periphery of the support ring is provided with several insertion holes corresponding to the installation positions of each air inlet bucket and for the pins to be inserted. One end of each pin passes through each air inlet bucket and is inserted into each insertion hole. The position of each insertion hole corresponds one-to-one with the installation position of each air inlet bucket on the flame tube base. The inner diameter of the insertion hole matches the outer diameter of the pin, ensuring that the pin can stably bear the positioning load of the air inlet bucket after insertion, and that positioning misalignment will not occur due to excessive gap.

[0012] As a preferred embodiment, the reference block and the support ring are fixed together by bolts. The reference block has at least two first positioning shafts, and the bottom edge of the support ring has positioning holes that mate with the first positioning shafts. The reference block and the support ring are fastened together using high-strength bolts. The top surface of the reference block has at least two cylindrical first positioning shafts, and the bottom edge of the support ring has corresponding positioning holes that mate with the first positioning shafts. The cooperation of the first positioning shafts and positioning holes allows for quick and precise alignment and installation of the support ring on the reference block, preventing relative rotation or displacement between the support ring and the reference block, and ensuring the circumferential positional accuracy of the support ring.

[0013] As a preferred embodiment, the reference block is provided with a second positioning shaft that matches the mounting hole at the bottom of the flame tube base. During installation, the mounting hole at the bottom of the flame tube base is fitted with the second positioning shaft, thereby achieving initial axial and circumferential positioning of the flame tube base on the reference block, laying the foundation for subsequent support of the support ring and positioning of the air inlet.

[0014] As a preferred embodiment, to further enhance the stability of the flame tube base after installation, the support assembly also includes several locking blocks. These blocks are evenly distributed along the bottom outer edge of the flame tube base. One end of each locking block is used to clamp the bottom outer edge of the flame tube base, and the other end of each locking block is fixed to the reference block by bolts. The locking blocks are evenly distributed along the circumference of the reference block along the bottom outer edge of the flame tube base. One end of each locking block has an arc-shaped contact surface that matches the contour of the bottom outer edge of the flame tube base, allowing it to fit tightly against the outer wall of the flame tube base. The other end is fixed to the mounting groove on the side of the reference block by bolts. By adjusting the preload of the bolts, a uniform radial clamping force can be applied to the flame tube base, effectively preventing the flame tube base from warping or shifting during the repair process due to welding heat deformation or external forces.

[0015] To achieve the above objectives, the present invention provides a flame tube repair method, which employs the aforementioned positioning fixture and includes the following steps: S1: Remove the air intake bucket to be replaced from the flame tube base; S2: Install the flame tube base onto the support assembly and install the new air intake bucket to the air intake bucket mounting position of the flame tube base using the positioning element; S3: Use argon arc welding to perform at least two symmetrical spot welding positions on the new air intake hopper; S4: Remove the positioning component, apply brazing filler metal to the mating surface of the new air inlet bucket and the flame tube substrate that has been spot-welded and positioned, and perform vacuum brazing; S5: Inspect the quality of the brazed weld and the installation dimensions of the air intake hopper.

[0016] As a preferred embodiment, step S1, the disassembly of the air intake hopper to be replaced on the flame tube base includes: grinding the original positioning weld points; inserting a mandrel into the air intake hopper to be replaced, using flame brazing to locally heat the brazed seam around the air intake hopper to be replaced, while simultaneously shaking the air intake hopper to be replaced using the mandrel; removing the air intake hopper to be replaced after the brazing filler melts; and cleaning the residual brazing filler and oxides.

[0017] As a preferred embodiment, in step S2, the step of installing the flame tube base on the support assembly and installing the new air intake bucket to the air intake bucket mounting position of the flame tube base using the positioning element includes: installing the flame tube base on the support assembly and adjusting its alignment; placing the new air intake bucket into the mounting position of the flame tube base; and installing the positioning element so that the end of the air intake bucket abuts against the reference surface of the positioning element.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The positioning fixture of the present invention achieves reliable internal support of the flame tube base and high-precision positioning of the new air intake bucket through the coordinated design of the support component and the positioning element. The positioning element is precisely adapted to the inner contour of the air intake bucket, and its end axial positioning reference surface ensures the consistency of the installation height of the new air intake bucket. The precise cooperation between the pin and the hole of the positioning element on the outer periphery of the support ring ensures the accuracy of the circumferential position, thus solving the problems of easy displacement of manual support and insufficient precision of general fixtures in traditional repair.

[0019] 2. The positioning fixture of the present invention adopts a detachable connection design. The support ring, pin, and locking block can be adjusted or replaced according to the structure of different models of flame tubes. It has good versatility and adaptability, and can meet the needs of batch and standardized repair, further reducing the investment cost of maintenance equipment.

[0020] 3. The repair method of the present invention uses local heating to disassemble the old air intake bucket, and uses a mandrel to assist in shaking and removing it, which reduces damage to the flame tube base; the new air intake bucket is positioned by symmetrical spot welding with a positioning fixture to avoid the air intake bucket deflection caused by single-point welding, which improves repair efficiency and pass rate, reduces the risk of the flame tube being scrapped due to air intake bucket burning, significantly saves maintenance costs, and extends the service life of parts.

[0021] The support ring is adapted to the inner wall shape of the flame tube base, and combined with the clamping action of the first and second positioning shafts of the reference block and the clamping block, it effectively suppresses the deformation of the thin-walled flame tube during the repair process. Attached Figure Description Figure 1 This is a structural schematic diagram of the positioning fixture of the present invention in use; Figure 2 yes Figure 1 Schematic diagram of the structure behind the hidden vortex plate; Figure 3 This is a schematic diagram of the positioning fixture; Figure 4 This is a schematic diagram of the flame tube structure; Figure 5 This is a schematic diagram of the assembly of the air intake hopper and the flame tube base; Figure 6 This is a flowchart of the flame tube repair method of the present invention.

[0022] In the figure: flame tube base 1; air inlet hopper 11; vortex plate 12; support assembly 2; reference block 21; support ring 22; first positioning shaft 23; second positioning shaft 24; locking block 25; positioning component 3. Detailed Implementation

[0023] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0024] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: like Figure 1-3 As shown, this embodiment provides a flame tube repair positioning fixture, including: Support component 2 is used to support the flame tube base 1; A plurality of positioning elements 3 are detachably connected to the support assembly 2 for positioning the installation position of each air intake hopper 11. The positioning elements 3 are adapted to the inner contour of the air intake hopper 11, and the end face of the positioning elements 3 constitutes an axial positioning reference surface for limiting the installation height of the new air intake hopper 11.

[0026] In this embodiment, as Figure 4-5 As shown, the flame tube includes a flame tube base 1, air inlets 11, and vortex plates 12. Twenty air inlets 11 are evenly distributed on the outer wall of the flame tube base 1. The vortex plates 12 are bolted to the top of the flame tube base 1. The flame tube base 1 is made of GH188 material, and the air inlets 11 are made of K40 material. The air inlets 11 are solid solution strengthened and carbide strengthened cobalt-based cast high-temperature alloys, exhibiting excellent thermal fatigue resistance, oxidation resistance, and corrosion resistance at high temperatures, making them particularly suitable for operation below 1000℃. The melting temperature of the air inlets 11 is 1400℃. The flame tube base 1 and the air inlets 11 are assembled by vacuum brazing. Air inlets 11 with cracked welds or those that have been ablated during use need to be replaced.

[0027] Specifically, the positioning element 3 is a pin that is adapted to the inner contour of the air intake hopper 11. The end of the pin forms the axial positioning reference surface used to limit the installation height of the new air intake hopper 11. One end of the pin passes through the air intake hopper 11 and is connected to the support assembly 2.

[0028] Specifically, the support assembly 2 includes a reference block 21 and a support ring 22. The support ring 22 is detachably connected to the reference block 21. The support ring 22 is adapted to the inner wall shape of the flame tube base 1 and is used to provide support from inside the flame tube base 1. One end of the pin is detachably connected to the support ring 22.

[0029] Specifically, the outer periphery of the support ring 22 is provided with a plurality of insertion holes corresponding to the installation positions of each air intake 11 and for the insertion of the pins. One end of each pin passes through each air intake 11 and is inserted into each insertion hole.

[0030] Specifically, the support component 2 also includes several locking blocks 25, which are evenly arranged on the bottom outer edge of the flame tube base 1. One end of each locking block 25 is used to clamp the bottom outer edge of the flame tube base 1, and the other end of each locking block 25 is fixed to the reference block 21 by bolts.

[0031] Example 2: This embodiment is similar to Embodiment 1, except that, in this embodiment, as shown... Figure 3As shown, the reference block 21 and the support ring 22 are fixed by bolts. The reference block 21 is provided with at least two first positioning shafts 23, and the bottom edge of the support ring 22 is provided with positioning holes that cooperate with the first positioning shafts 23.

[0032] Specifically, the reference block 21 is provided with a second positioning shaft 24 that is adapted to the mounting hole at the bottom of the flame tube base 1.

[0033] Example 3: like Figure 6 As shown, this embodiment provides a method for repairing a flame tube, using the positioning fixture described in Embodiments 1 and 2, and including the following steps: S1: Remove the air intake hopper 11 to be replaced from the flame tube base 1; Specifically, in step S1, disassembling the air intake hopper 11 to be replaced on the flame tube base 1 includes: grinding the original positioning weld points; inserting a φ3.5 mandrel into the air intake hopper 11 to be replaced, using flame brazing to locally heat the brazing weld around the air intake hopper 11 to be replaced, while heating and shaking the air intake hopper 11 to be replaced; removing the air intake hopper 11 to be replaced when the brazing weld begins to melt into a paste; and cleaning excess brazing material and positioning weld points using a grinding tool. S2: Install the flame tube base 1 on the support assembly 2 and install the new air intake hopper 11 to the air intake hopper 11 installation position of the flame tube base 1 using the positioning element 3; Specifically, in step S2, before assembly, the area to be welded on the flame tube base 1 and the new air inlet 11 are wiped clean with a white silk cloth to ensure that the assembly process is clean and free of oil stains. The flame tube base 1 is installed on the support assembly 2 and adjusted for centering. The new air inlet 11 is placed in the mounting position of the flame tube base 1. The positioning component 3 is installed so that the end of the air inlet 11 is against the reference surface of the positioning component 3. S3: Use argon arc welding to perform at least two symmetrical spot welding positions on the new air intake hopper 11; Specifically, in step S3, a manual argon arc welding machine is used for positioning welding. The two weld points in opposite positions position the air intake hopper 11 to ensure that the air intake hopper 11 fits snugly against the outer wall of the flame tube base 1 and does not fall off, thus ensuring dimensional accuracy. After the positioning welding is completed, the dimensions are checked. The installation height of the air intake hopper 11 is 57.5mm. The diameter Φ229 between the two symmetrical air intake hoppers is checked to be qualified. A φ3.5 mandrel can freely pass through the two radially opposite air intake hoppers 11 to ensure that the position of the air intake hopper 11 is evenly distributed and qualified. The roundness is measured with calipers and is qualified at 1mm. A feeler gauge is used to check that the gap between the contact surfaces of the brazing area is ≤0.1mm. A grinder is used to remove spatter and oxide film around the positioning weld points, and the parts are cleaned with ultrasonic cleaning for 40-45 minutes.

[0034] In this embodiment, an argon arc welding device of model MW2200 was used, with a current of 15-25A, welding wire of HGH230, welding wire diameter of Φ1.0, argon flow rate of 10-15L / min, and reverse ventilation protection flow rate of 10-15L / min.

[0035] S4: Remove the positioning component 3, apply brazing filler metal to the mating surface of the new air intake hopper 11 that has been spot-welded and positioned and the flame tube base 1, and perform vacuum brazing. Specifically, a paste-like brazing filler metal is added to the mating groove between the air inlet hopper 11 and the flame tube substrate 1, ensuring the filler metal is completely filled. Simultaneously, a flow-retardant agent is brushed 3mm from the perimeter of the filling groove. The entire part is then placed in a heating furnace to dry at a temperature not exceeding 100°C for 20 minutes. The entire part is then placed in a vacuum brazing furnace for brazing cycles at 1040°C for 8–10 minutes.

[0036] S5: Inspect the quality of the brazed weld and the installation dimensions of the air inlet hopper 11.

[0037] Specifically, check the relevant dimensions of the air intake hopper 11, perform fluorescent inspection on the weld quality, and inspect it with a 5-10x magnifying glass.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A flame tube repair positioning fixture, characterized by, The utility model relates to a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

2. A flame tube repair positioning fixture as claimed in claim 1, characterized in that The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

3. A flame tube repair positioning fixture as set forth in claim 2, characterized in that, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

4. A flame tube repair positioning fixture as set forth in claim 3, characterized in that, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

5. A flame tube repair positioning fixture as set forth in claim 3, characterized in that, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

6. A flame tube repair positioning fixture as set forth in claim 3, characterized in that, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

7. A flame tube repair positioning fixture as set forth in claim 3, characterized by, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base.

8. A method of flame tube repair, characterized by, The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube base. The utility model discloses a positioning fixture for the installation of air intake funnel on the flame tube base, and more particularly to a positioning fixture for the installation of air intake funnel on the flame tube 9. A method of repairing a flame tube according to claim 8, characterized in that In step S1, the dismounting of the intake hopper (11) to be replaced on the flame tube base body (1) comprises: grinding the original positioning weld points; inserting a core rod into the intake hopper (11) to be replaced, locally heating the brazing seam around the intake hopper (11) to be replaced by using a flame brazing, and simultaneously shaking the intake hopper (11) to be replaced through the core rod; taking down the intake hopper (11) to be replaced after the brazing filler metal is melted; and cleaning the residual brazing filler metal and oxides.

10. The method of claim 8, wherein, In step S2, the mounting of the flame tube base body (1) on the support assembly (2) and the mounting of the new intake hopper (11) to the intake hopper (11) mounting position of the flame tube base body (1) through the positioning member (3) comprises: mounting the flame tube base body (1) on the support assembly (2) and adjusting the centering; placing the new intake hopper (11) into the mounting position of the flame tube base body (1); and mounting the positioning member (3) so that the end of the intake hopper (11) abuts against the reference surface of the positioning member (3).

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