Gas turbine labyrinth seal coating removing equipment and method and magnetic mixed abrasive

Abstract

The invention relates to the technical field of gas turbine maintenance equipment, and discloses gas turbine labyrinth seal coating removing equipment which comprises a first machine tool and a second machine tool, a three-jaw chuck is arranged on the first machine tool, a labyrinth seal is arranged on the three-jaw chuck, the second machine tool is arranged on one side of the first machine tool, and a lifting table is arranged on the second machine tool in a sliding mode. A first motor is obliquely arranged at the top of the lifting table, a grinding head is arranged on an output shaft of the first motor, the outer side wall of the grinding head is in a step shape and is matched with all stages of labyrinth sealed by the labyrinth, and a magnetic mixed grinding material is arranged on the grinding head; the invention further discloses a gas turbine labyrinth seal coating removing method and the magnetic mixed abrasive, the labyrinth part seal coating can be efficiently and stably removed, the magnetic mixed abrasive can be matched with various labyrinth part seals, and the removing effect and removing efficiency of the labyrinth part seal coating are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of gas turbine maintenance equipment technology, and in particular to a gas turbine grate sealing coating removal device, method, and magnetic abrasive. Background Technology

[0002] The gas turbine's grate sealing structure is a core component affecting overall efficiency and fuel economy. To ensure reliable sealing during long-term operation, the grate tips are typically coated with a wear-resistant coating, such as a Ni5Al-based composite coating, while the corresponding stator ring is coated with a wear-resistant sealing coating, such as nickel, graphite, boron nitride, or nickel-chromium-aluminum coatings. During gas turbine overhauls or remanufacturing, due to coating aging, peeling, or dimensional deviations, residual coatings must be precisely removed and recoated to enable component reuse.

[0003] Currently, the main methods for removing the sealing coating of ferrule-type parts are as follows: First, manual grinding or mechanical scraping, which is the most commonly used method by domestic repair companies. Operators use tools such as sandpaper, oilstones or rotary files to manually remove the coating from the top and sidewalls of the ferrules. Second, chemical or electrochemical stripping methods, which use specific chemical solutions (such as strong acids or strong alkalis) to dissolve and peel off the coating.

[0004] The existing technology has at least the following problems: For manual grinding or mechanical scraping, firstly, the removal accuracy depends entirely on the operator's experience, the coating removal thickness is uneven, and it is very easy to damage the expensive nickel-based high-temperature alloy substrate due to excessive grinding, resulting in scrapped parts; secondly, the structure of the grating is complex, and areas such as the tooth root and inter-tooth grooves are difficult to reach, resulting in dead corners for removal; thirdly, it is labor-intensive, inefficient, and generates a large amount of metal dust, which is harmful to the operator's health.

[0005] For chemical or electrochemical stripping methods, there are several drawbacks. First, there is a problem of poor selectivity. While chemical reagents dissolve the coating, they can easily cause intergranular corrosion or hydrogen embrittlement in the substrate, which seriously affects the fatigue life of the parts. Second, the cost of waste liquid treatment is high. Third, for complex gratings, the surface tension of the solution can cause gas residue in the grooves, creating local "blind spots" and resulting in incomplete removal. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by developing a device, method, and magnetic abrasive for removing sealing coatings from gas turbine grating parts. This invention can efficiently and stably remove sealing coatings from grating parts and is adaptable to various grating parts, effectively improving the removal effect and efficiency of sealing coatings on grating parts.

[0007] The technical solution to the technical problem solved by the present invention is as follows: On the one hand, the embodiments of the present invention provide a gas turbine grate seal coating removal device, including a first machine tool and a second machine tool. The first machine tool is provided with a three-jaw chuck, and the grate seal is provided on the three-jaw chuck. The second machine tool is disposed on one side of the first machine tool. A lifting platform is slidably provided on the second machine tool. A first motor is inclinedly provided on the top of the lifting platform. A grinding head is provided on the output shaft of the first motor. The outer side wall of the grinding head is stepped. The outer side wall of the grinding head cooperates with the various levels of the grate teeth of the grate seal. Magnetic mixing abrasive is provided on the grinding head.

[0008] As an optimization, the second machine tool includes a base, a second motor, a ball screw, a linear guide, and a mounting table. The second motor is located at one end of the base, which also houses the ball screw and linear guide. The output shaft of the second motor is connected to the screw of the ball screw via a coupling. The nut of the ball screw is connected to the center of the bottom of the mounting table via a nut seat. The bottom sides of the mounting table are connected to the sliders of the linear guide. The linear guide's track is set on the base, and the lifting platform is positioned on top of the mounting table. The base provides a stable support foundation for the entire second machine tool, ensuring the lifting platform does not wobble during axial movement. The second motor provides precise drive power to the ball screw, achieving stable control of the grinding head's axial feed speed. The ball screw converts rotary motion into linear motion, enabling high-precision axial feed of the mounting table and improving grinding position accuracy. The linear guide guide guides and limits the mounting table, ensuring smooth, unbiased movement and guaranteeing grinding accuracy. The mounting table supports the lifting platform and the first motor, enabling synchronous axial movement.

[0009] As an optimization, a motor mount is provided on the top of the lifting platform. The motor mount is V-shaped, with one end connected to the lifting platform and the first motor mounted on the second end of the motor mount. By setting up the motor mount, a stable mounting support can be provided for the first motor, ensuring stable and vibration-free motor operation. By setting the motor mount to a V-shaped structure, the first motor and the grinding head can maintain a preset tilt angle, allowing the grinding head to better fit the complex surface of the grate teeth, improving grinding fit and removal efficiency.

[0010] As an optimization, the grinding head includes several stages of grinding discs. Each stage of the grinding disc group includes axial magnetic pole grinding discs and radial magnetic pole grinding discs. A gap is provided between the end face edge of the axial magnetic pole grinding disc and the back of the sealed grate tooth, and a gap is provided between the side wall of the radial magnetic pole grinding disc and the tip of the sealed grate tooth. By setting the axial magnetic pole grinding disc, a magnetic mixed abrasive can be formed in the axial direction to attract magnetic mixed abrasive, enabling precise and flexible grinding of the coating on the back of the sealed grate tooth, avoiding damage to the substrate. By setting the radial magnetic pole grinding disc, a magnetic mixed abrasive can be formed in the radial direction to attract magnetic mixed abrasive, efficiently removing the coating from the tip of the sealed grate tooth, ensuring thorough cleaning of the coating at the tooth tip. By reserving a reasonable gap, flexible grinding with magnetic mixed abrasive can be achieved, avoiding rigid contact that could cause grate tooth deformation, scratches, or micro-cracks.

[0011] As an optimization, the grinding head is integrally molded. Each axial end face of the grinding head has an axial magnetic pole, and each radial side face has a radial magnetic pole. There is a gap between the axial magnetic pole and the back of the sealed grate tooth, and a gap between the radial magnetic pole and the tip of the sealed grate tooth. By making the grinding head an integral structure, the overall rigidity and rotational accuracy are improved, ensuring the coaxiality of each grinding surface and enhancing grinding consistency. The axial magnetic poles attract magnetic abrasive particles for directional grinding of the grate tooth back, ensuring complete removal of the coating. The radial magnetic poles attract magnetic abrasive particles for precise grinding of the grate tooth tips, ensuring no coating residue at the tips. By reserving appropriate gaps, flexible grinding processing is achieved, protecting the grate substrate from scratches and micro-cracks.

[0012] As an optimization, the lifting platform can be any one of the following: scissor type, telescopic cylinder type, or guide rail type. By setting the lifting platform to a scissor type, telescopic cylinder type, or guide rail type, stable and stepless adjustment of the grinding head height can be achieved, adapting to the processing needs of different specifications and models of grate teeth seals, and improving the equipment's versatility.

[0013] On the other hand, embodiments of the present invention provide a method for removing the sealing coating of a gas turbine grate, comprising the following steps: S1. Install the grinding head, attach the grinding head to the output shaft of the first motor, and adsorb the magnetic mixed abrasive on the grinding head; S2. Clamping and tool setting: Install and clamp the grate sealer onto the three-jaw chuck, correct the radial runout to 0.01-0.03mm, start the second machine tool and the lifting table, adjust the position of the grinding head so that the gap between the grinding head and the tip of the grate sealer is 1-1.4mm, and the gap between the grinding head and the back of the grate sealer is 0.9-1.1mm. S3. Grinding: Start the first machine tool, the first motor, and the second machine tool. The first machine tool rotates clockwise, the first motor rotates counterclockwise, and the second machine tool feeds the grinding head axially. The grinding head grinds and removes the coating area of ​​the grate teeth. S4. Stop the machine. By monitoring the current of the first motor in real time to determine the load change, when the current value drops significantly and suddenly, it is determined that the coating has been removed and the substrate is exposed. The second machine tool immediately stops feeding and shuts down the first machine tool and the first motor. Remove the grate seal and blow the surface clean with compressed air. After fluorescence penetration testing and microscopic observation, if the coating is completely removed and the substrate surface has no scratches or microcracks and the surface roughness reaches 0.6μm, the recoating requirements are met.

[0014] In another aspect, embodiments of the present invention provide a magnetic mixed abrasive for removing the sealing coating of gas turbine grate teeth, used in the gas turbine grate tooth sealing coating removal equipment, comprising the following components in parts by weight: 8-11 parts of 80-mesh iron-based magnetic abrasive, 2-4 parts of water-based polishing fluid, and 0.5-1.5 parts of polishing paste.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By setting up a first machine tool, a stable rotary drive can be provided for the grate seal, ensuring uniform rotation of the grate seal during grinding and improving the uniformity of coating removal. By setting up a three-jaw chuck, the grate seal can be quickly centered and firmly clamped, ensuring stable radial runout during workpiece rotation and avoiding grinding deviation. By setting up a second machine tool, an axial movement platform can be provided for the grinding head, enabling precise feeding of the grinding head. By setting up a lifting platform, the height position of the grinding head can be adjusted to adapt to the grinding needs of grate seals of various sizes. By setting up a first motor, high-speed rotational power can be provided for the grinding head, ensuring that the magnetic mixed abrasive has sufficient grinding kinetic energy. By setting up a stepped grinding head, it can precisely match the various levels of grate structure of the grate seal, achieving synchronous grinding of complex surfaces such as tooth backs and tooth tips. By setting up a magnetic mixed abrasive, it can flexibly adhere to and cover the complex surface of the grate under the action of a magnetic field, efficiently removing the coating without damaging the substrate, avoiding substrate scratches and micro-cracks, avoiding overcutting and scrapping caused by manual grinding, and can also reach areas such as tooth grooves that rigid tools cannot reach, ensuring processing without dead angles.

[0016] Step S1 ensures uniform adsorption of the grinding media, providing a foundation for flexible grinding. Step S2 controls the radial runout of the grate seal within 0.01–0.03 mm, while precisely setting the grinding gap to ensure uniform coating removal without damaging the substrate. Step S3 employs a differential grinding method where the grate seal rotates forward and the grinding head rotates backward, combined with timed replenishment of grinding fluid and magnetically mixed abrasive, achieving efficient and stable coating removal and ensuring surface quality. Step S4 uses a sudden change in the first motor current to accurately determine the coating removal endpoint, avoiding over-grinding and substrate damage, while ensuring a surface roughness of 0.6 μm to meet recoating requirements.

[0017] 80-mesh iron-based magnetic abrasives can provide suitable magnetism and grinding ability, ensuring coating removal efficiency without scratching the substrate; water-based grinding fluid can cool, lubricate, and remove chips, reducing grinding heat and minimizing surface micro-cracks; grinding paste can improve grinding precision, making the surface roughness stably reach 0.6μm, meeting the pre-treatment standards for recoating gas turbine grate sealing parts. Attached Figure Description

[0018] Figure 1 This is a front view of the gas turbine grate sealing coating removal device of the present invention.

[0019] Figure 2 This is a left view of the gas turbine grate sealing coating removal device of the present invention.

[0020] Figure 3 for Figure 2 A cross-sectional view along the AA direction.

[0021] Figure 4 for Figure 3 A magnified view of a portion of region A in the middle.

[0022] Figure 5 This is a flowchart of the gas turbine grate sealing coating removal method of the present invention.

[0023] In the diagram: 1. First machine tool; 2. Three-jaw chuck; 3. Grate seal; 4. Second machine tool; 5. Lifting platform; 6. First motor; 7. Grinding head; 8. Magnetic mixed abrasive; 9. Base; 10. Second motor; 11. Ball screw; 12. Linear guide rail; 13. Mounting platform; 14. Motor base; 15. Axial magnetic pole grinding disc; 16. Radial magnetic pole grinding disc. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0025] Example 1 Figures 1 to 4In one embodiment of the present invention, this embodiment targets a certain type of gas turbine grating component, the surface coating of which is a Ni5Al+Al2O3 composite wear-resistant coating with a thickness of 0.15mm, and the substrate is GH4169 high-temperature alloy. Figures 1 to 4 As shown, a gas turbine grate seal coating removal device includes a first machine tool 1 and a second machine tool 4. The first machine tool 1 is equipped with a three-jaw chuck 2, and the three-jaw chuck 2 is equipped with a grate seal 3. The second machine tool 4 is located on one side of the first machine tool 1. A lifting platform 5 is slidably provided on the second machine tool 4. A first motor 6 is inclinedly provided on the top of the lifting platform 5. A grinding head 7 is detachably provided on the output shaft of the first motor 6 through a nut. The outer side wall of the grinding head 7 is stepped and cooperates with the various levels of the grate teeth of the grate seal 3. Magnetic mixing abrasive 8 is provided on the grinding head 7.

[0026] By setting up the first machine tool 1, a stable rotation drive can be provided for the grate seal 3, ensuring that the grate seal 3 rotates at a uniform speed during the grinding process and improving the uniformity of coating removal; by setting up the three-jaw chuck 2, the grate seal 3 can be quickly centered and firmly clamped, ensuring stable radial runout during workpiece rotation and avoiding grinding deviation; by setting up the second machine tool 4, an axial movement platform can be provided for the grinding head 7, realizing precise feeding of the grinding head 7; by setting up the lifting platform 5, the height position of the grinding head 7 can be adjusted to adapt to the grinding needs of grate seals 3 of various sizes; by setting up the first electric... Machine 6 can provide high-speed rotation power for grinding head 7, ensuring that magnetic hybrid abrasive 8 has sufficient grinding kinetic energy; by setting a stepped grinding head 7, it can precisely match the various levels of the grate tooth structure of the grate tooth seal 3 to achieve synchronous grinding of complex surfaces such as tooth back and tooth tip; by setting a magnetic hybrid abrasive 8, it can flexibly adhere to and cover the complex surface of the grate tooth under the action of a magnetic field, efficiently removing the coating without damaging the substrate, avoiding substrate scratches and micro-cracks, avoiding overcutting and scrapping caused by manual grinding, and can also reach areas such as tooth grooves that rigid tools cannot reach, ensuring processing without dead angles.

[0027] like Figure 1 and Figure 3As shown, the second machine tool 4 includes a base 9, a second motor 10, a ball screw 11, a linear guide rail 12, and a mounting table 13. The second motor 10 is located at one end of the base 9. The ball screw 11 and the linear guide rail 12 are located on the base 9. The ball screw 11 is located between two sets of linear guide rails 12. The output shaft of the second motor 10 is connected to the screw of the ball screw 11 through a coupling. The nut of the ball screw 11 is connected to the center of the bottom of the mounting table 13 through a nut seat. The bottom sides of the mounting table 13 are connected to the sliders of the linear guide rail 12. The track of the linear guide rail 12 is located on the base 9. The lifting platform 5 is located on the top of the mounting table 13. By setting the base 9, a stable support foundation can be provided for the second machine tool 4 as a whole, ensuring that the lifting table 5 does not wobble during axial movement; by setting the second motor 10, precise driving power can be provided for the ball screw 11, realizing stable control of the axial feed speed of the grinding head 7; by setting the ball screw 11, the rotary motion can be converted into linear motion, realizing high-precision axial feed of the mounting table 13 and improving the grinding position accuracy; by setting the linear guide rail 12, the mounting table 13 can be guided and limited, ensuring smooth movement without swaying and ensuring grinding accuracy; by setting the mounting table 13, the lifting table 5 and the first motor 6 can be supported, realizing synchronous axial movement.

[0028] like Figure 1 and Figure 3 As shown, the top of the lifting platform 5 is equipped with a motor base 14, which is V-shaped. The first end of the motor base 14 is connected to the lifting platform 5, and the first motor 6 is mounted on the second end of the motor base 14. By setting the motor base 14, a stable mounting support can be provided for the first motor 6, ensuring stable and vibration-free motor operation. By setting the motor base 14 into a V-shaped structure, the first motor 6 and the grinding head 7 can maintain a preset tilt angle, allowing the grinding head 7 to better fit the complex surface of the grate seal 3, improving the grinding fit and removal efficiency.

[0029] like Figure 1 , Figure 3 and Figure 4As shown, the grinding head 7 includes several stages of grinding discs. Each stage of the grinding disc group includes an axial magnetic pole grinding disc 15 and a radial magnetic pole grinding disc 16. A gap is provided between the end face edge of the axial magnetic pole grinding disc 15 and the back of the grate teeth of the grate seal 3, and a gap is provided between the side wall of the radial magnetic pole grinding disc 16 and the tip of the grate teeth of the grate seal 3. By setting the axial magnetic pole grinding disc 15, a magnetic field can be formed in the axial direction to attract magnetic mixed abrasive 8, enabling precise and flexible grinding of the coating on the back of the grate teeth of the grate seal 3, avoiding damage to the substrate. By setting the radial magnetic pole grinding disc 16, a magnetic field can be formed in the radial direction to attract magnetic mixed abrasive 8, efficiently removing the coating from the tips of the grate teeth of the grate seal 3, ensuring thorough cleaning of the coating at the tooth tips. By reserving a reasonable gap, flexible grinding with the magnetic mixed abrasive 8 can be achieved, avoiding rigid contact that could cause deformation, scratches, or micro-cracks in the grate teeth.

[0030] like Figure 1 and Figure 3 As shown, the lifting platform 5 can be any one of a scissor-type lifting platform, a telescopic cylinder-type lifting platform, or a guide rail-type lifting platform. By setting the lifting platform 5 as a scissor-type, telescopic cylinder-type, or guide rail-type lifting platform, the height of the grinding head 7 can be stably and steplessly adjusted, adapting to the processing requirements of different specifications and models of grate tooth seals 3, and improving the versatility of the equipment.

[0031] Example 2 The difference between this embodiment and the first embodiment is that the grinding head 7 is integrally formed. Each axial end face of the grinding head 7 is provided with an axial magnetic pole, and each radial side face of the grinding head 7 is provided with a radial magnetic pole. There is a gap between the axial magnetic pole and the back of the grate teeth of the grate tooth seal 3, and a gap between the radial magnetic pole and the tip of the grate teeth of the grate tooth seal 3. By setting the grinding head 7 as an integrally formed structure, the overall rigidity and rotational accuracy can be improved, ensuring the coaxiality of each grinding surface and enhancing grinding consistency. By setting the axial magnetic pole, the magnetic mixed abrasive 8 can be attracted to perform directional grinding on the back of the grate teeth, ensuring complete removal of the coating on the tooth back. By setting the radial magnetic pole, the magnetic mixed abrasive 8 can be attracted to perform precise grinding on the tips of the grate teeth, ensuring no coating residue at the tips. By reserving reasonable gaps, flexible grinding processing can be achieved, protecting the grate tooth substrate from scratches and micro-cracks.

[0032] like Figure 5 As shown, the present invention also provides a method for removing the sealing coating of a gas turbine grate, which is used in a gas turbine grate sealing coating removal device, and includes the following steps: S1. Install the grinding head 7, install the grinding head 7 onto the output shaft of the first motor 6, and adsorb the magnetic mixed abrasive 8 onto the grinding head 7; S2. Clamping and tool setting: Install and clamp the grate seal 3 onto the three-jaw chuck 2, correct the radial runout to 0.02mm, start the second machine tool 4 and the lifting table 5, adjust the position of the grinding head 7 so that the gap between the grinding head 7 and the grate tooth tip of the grate seal 3 is 1.2mm, and the gap between the grinding head 7 and the grate tooth back of the grate seal 3 is 1mm. S3. Grinding: Start the first machine tool 1, the first motor 6, and the second machine tool 4. The first machine tool 1 rotates clockwise at a spindle speed of 10 r / min. The first motor 6 rotates counterclockwise at a speed of 800 r / min. The second machine tool 4 feeds the grinding head 7 along the axial direction at a speed of 0.2 mm / s. The grinding head 7 grinds and removes the coating area of ​​the grate teeth. During the grinding process, 2 ml of water-based grinding fluid is added every 8 minutes, and 3 g of magnetic mixed abrasive is added every 12 minutes. The magnetic mixed abrasive 8 forms a "magnetic particle brush" along the direction of the magnetic field line under the action of the magnetic field force. As the spindle of the first motor 6 rotates, the magnetic grinding particles generate relative motion with the coating of the grate teeth, which will produce a scratching and grinding effect on the coating of the grate teeth, remove a small amount of coating, remove burrs, lighten the surface texture of the grate teeth substrate, improve the surface quality, and complete the coating removal process. S4. Stop the machine. By monitoring the current of the first motor 6 in real time to determine the load change, when the current value drops significantly and suddenly, it is determined that the coating has been removed and the substrate is exposed. The second machine tool 4 immediately stops feeding and shuts down the first machine tool 1 and the first motor 6. Remove the grate seal 3, blow the surface clean with compressed air, and observe it with fluorescence penetration test and microscope. If the coating is completely removed, the substrate surface is free of scratches and microcracks, and the surface roughness reaches 0.6μm, then the recoating requirements are met. Step S1 ensures uniform adsorption of the grinding media, providing a foundation for flexible grinding. Step S2 controls the radial runout of the grate seal 3 to within 0.02mm, while precisely setting the grinding gap to ensure uniform coating removal without damaging the substrate. Step S3 employs a differential grinding method where the grate seal 3 rotates forward and the grinding head 7 rotates backward, combined with timed replenishment of grinding fluid and magnetically mixed abrasive, achieving efficient and stable coating removal and ensuring surface quality. Step S4 allows for precise determination of the coating removal endpoint through sudden current changes in the first motor 6, preventing over-grinding and substrate damage, while ensuring a surface roughness of 0.6μm to meet recoating requirements.

[0033] This invention also provides a magnetic mixed abrasive for removing the coating of gas turbine grate seals, used in the aforementioned gas turbine grate seal coating removal equipment. In step S1, a magnetic mixed abrasive 8 is prepared before adsorption. The magnetic mixed abrasive 8 comprises the following components in parts by weight: 10 parts of 80-mesh iron-based magnetic abrasive, 4 parts of water-based polishing fluid, and 1 part of polishing paste. The 80-mesh iron-based magnetic abrasive provides suitable magnetism and polishing ability, ensuring coating removal efficiency without scratching the substrate; the water-based polishing fluid provides cooling, lubrication, and chip removal, reducing polishing heat and minimizing surface microcracks; the polishing paste improves polishing precision, ensuring a stable surface roughness of 0.6 μm, meeting the pre-treatment standards for recoating gas turbine grate seal parts.

[0034] The descriptions of the orientation or relative positional relationships of the structures in this invention, such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer", are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the structure 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.

Claims

1. A gas turbine grate sealant coating removal device, comprising a first machine tool (1), characterized in that, It also includes a second machine tool (4), a three-jaw chuck (2) on the first machine tool (1), a grate seal (3) on the three-jaw chuck (2), the second machine tool (4) is located on one side of the first machine tool (1), a lifting platform (5) is slidably provided on the second machine tool (4), a first motor (6) is inclined on the top of the lifting platform (5), a grinding head (7) is provided on the output shaft of the first motor (6), the outer side wall of the grinding head (7) is stepped, the outer side wall of the grinding head (7) cooperates with the various levels of the grate teeth of the grate seal (3), and a magnetic mixed abrasive (8) is provided on the grinding head (7).

2. The gas turbine grate seal coating removal device according to claim 1, characterized in that, The second machine tool (4) includes a base (9), a second motor (10), a ball screw (11), a linear guide (12), and a mounting table (13). The second motor (10) is provided at one end of the base (9). The ball screw (11) and the linear guide (12) are provided on the base (9). The output shaft of the second motor (10) is connected to the screw of the ball screw (11) through a coupling. The nut of the ball screw (11) is connected to the center of the bottom of the mounting table (13) through a nut seat. The bottom sides of the mounting table (13) are connected to the sliders of the linear guide (12). The track of the linear guide (12) is set on the base (9). The lifting platform (5) is set on the top of the mounting table (13).

3. The gas turbine grate seal coating removal device according to claim 1, characterized in that, The top of the lifting platform (5) is provided with a motor base (14), which is V-shaped. The first end of the motor base (14) is connected to the lifting platform (5), and the first motor (6) is set on the second end of the motor base (14).

4. The gas turbine grate seal coating removal device according to claim 1, characterized in that, The grinding head (7) includes several grinding plate groups. Each grinding plate group includes an axial magnetic pole grinding plate (15) and a radial magnetic pole grinding plate (16). There is a gap between the end face edge of the axial magnetic pole grinding plate (15) and the back of the tooth of the tooth seal (3). There is a gap between the side wall of the radial magnetic pole grinding plate (16) and the tip of the tooth of the tooth seal (3).

5. The gas turbine grate seal coating removal device according to claim 1, characterized in that, The grinding head (7) is integrally formed. Each level of the axial end face of the grinding head (7) is provided with an axial magnetic pole, and each level of the radial side face of the grinding head (7) is provided with a radial magnetic pole. There is a gap between the axial magnetic pole and the back of the tooth of the tooth seal (3), and there is a gap between the radial magnetic pole and the tip of the tooth of the tooth seal (3).

6. The gas turbine grate seal coating removal device according to any one of claims 1 to 5, characterized in that, The lifting platform (5) can be any one of the following: scissor lift, telescopic cylinder lift, and guide rail lift.

7. A method for removing the sealing coating of a gas turbine grate tooth as described in claim 1, characterized in that, Includes the following steps: S1. Install the grinding head (7), install the grinding head (7) on the output shaft of the first motor (6), and adsorb the magnetic mixed abrasive (8) on the grinding head (7); S2. Clamping and tool setting: Install and clamp the grate tooth seal (3) onto the three-jaw chuck (2), correct the radial runout to 0.01-0.03mm, start the second machine tool (4) and the lifting table (5), adjust the position of the grinding head (7) so that the gap between the grinding head (7) and the grate tooth tip of the grate tooth seal (3) is 1-1.4mm, and the gap between the grinding head (7) and the grate tooth back of the grate tooth seal (3) is 0.9-1.1mm; S3. Grinding: Start the first machine tool (1), the first motor (6) and the second machine tool (4). The first machine tool (1) rotates clockwise and the first motor (6) rotates counterclockwise. The second machine tool (4) feeds the grinding head (7) along the axial direction. The grinding head (7) grinds and removes the coating area of ​​the grate teeth. S4. Stop the machine. The load change is judged by real-time monitoring of the current of the first motor (6). When the current value drops significantly and suddenly, it is determined that the coating has been removed and the substrate is exposed. The second machine tool (4) immediately stops feeding and shuts down the first machine tool (1) and the first motor (6). The grate seal (3) is removed and the surface is cleaned by compressed air. After fluorescence penetration detection and microscopic observation, if the coating is completely removed and the substrate surface has no scratches or microcracks and the surface roughness reaches 0.6μm, the recoating requirements are met.

8. A magnetic abrasive mixture for removing the sealing coating of gas turbine grate teeth, used in the gas turbine grate tooth sealing coating removal equipment of claim 1, characterized in that, It comprises the following components in parts by weight: 8-11 parts of 80-mesh iron-based magnetic abrasive, 2-4 parts of water-based polishing fluid, and 0.5-1.5 parts of polishing paste.

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