Compressor Blade Impact Repair Device and Repair Method

Abstract

The present invention discloses a compressor blade damage repair device and a repair method, comprising: a support member for fixing the repair device to the compressor, the support member having a connection structure for fixedly connecting with one vane of the axial-flow compressor casing; a limiting assembly mounted on the support member for restricting the rotation of the rotor of the compressor so as to prevent the blades of the compressor from rotating with the rotor; and a repair assembly mounted on the support member for repairing the damaged blades. The support member of this repair device can be fixedly connected with one vane of the axial-flow compressor casing through its connection structure, that is, by removing any half of the axial-flow compressor casing and fixing the support member on the undismantled half of the axial-flow compressor casing, the fixing of this repair device on the compressor is completed. There is no need to remove the engine as a whole to take out the blades, avoiding cumbersome disassembly steps and improving the repair efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengines, and in particular, to a repair device for damaged compressor blades. In addition, the present invention also relates to a repair method including the above repair device for damaged compressor blades. Background Art

[0002] Compressor rotor blades of a certain type of engine may be damaged by foreign objects during operation. To ensure performance and save costs, they are repaired and then put back into use.

[0003] When the compressor rotor blades are worn or damaged by foreign objects, grinding the fillets of the compressor rotor blades is an effective method to restore the engine performance. However, repairing the blades requires removing a large number of components such as the engine casing, which is equivalent to disassembling the entire engine into parts, resulting in low work efficiency for returning to the factory for disassembly and repair. Summary of the Invention

[0004] The present invention provides a repair device and a repair method for damaged compressor blades to solve the technical problem of low efficiency of returning to the factory for disassembly and repair after the compressor rotor blades of the existing engine are damaged.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A repair device for damaged compressor blades, which is used to repair the damaged compressor blades in the assembled state of the engine, includes:

[0007] A support member, which is used to be fixed inside the compressor after the window is opened. The support member has a connection structure, and the connection structure is used to fixedly connect with one vane of the axial-flow compressor casing.

[0008] A limiting component, which is installed on the support member and is used to limit the rotation of the rotor of the compressor so as to prevent the blades of the compressor from rotating with the rotor.

[0009] A repair component, which is installed on the support member and is used to repair the damaged blades.

[0010] As a further improvement of the above technical solution, the support member includes a support section, the support section has a concave surface for avoiding the internal structure of the compressor, the connection structure includes connecting plates arranged at both ends of the support section, and the connecting plates are provided with connecting holes. The arrangement positions of the connecting holes match the positions of the mounting holes of the corresponding vane of the axial-flow compressor casing.

[0011] As a further improvement of the above technical solution, the limiting component includes a fixing block fixedly arranged on the first side surface of the supporting member. A guiding hole is radially formed in the fixing block with respect to the axis of the rotor. A moving rod is inserted through the guiding hole. The first end of the moving rod faces the rotor and is provided with a pressing member adapted to the outer ring surface of the rotor. The second end of the moving rod is provided with an adjusting member for adjusting the axial position of the moving rod in the guiding hole, so that the pressing member presses and fixes the rotor or moves away from the rotor.

[0012] As a further improvement of the above technical solution, the repair component includes a repair tool and a guiding component. The guiding component includes a bracket and a locking member. The supporting member is provided with an installation groove for inserting the bracket. The opening direction of the installation groove is parallel to the axial direction of the rotor. The locking member is used to fix the bracket in the installation groove. One end of the bracket is provided with a guiding groove for guiding the repair tool to the blade for repair.

[0013] As a further improvement of the above technical solution, the repair component further includes an insurance component for restricting the moving length of the repair tool towards the blade.

[0014] On the other hand, a method for repairing a damaged compressor blade is also provided, which is applied to the compressor blade damage repair device described in any one of the above. The repair method includes the following steps:

[0015] S1. Check the damage degree of the blade;

[0016] S2. Determine the target blade to be repaired;

[0017] S3. Mark the target blade to be repaired;

[0018] S4. Repair the target blade to be repaired.

[0019] As a further improvement of the above technical solution:

[0020] When checking the damage degree of the blade, it specifically includes:

[0021] S11. Remove and retain one vane of the axial-flow casing on the compressor;

[0022] S12. Rotate the compressor rotor to drive the blade to rotate, and check in turn whether all the blades are damaged.

[0023] As a further improvement of the above technical solution, when determining the target blade to be repaired, it specifically includes:

[0024] S21. Determine the number of damaged blades and the number of damages at the diagonal positions on the blades. If the number of damaged blades exceeds the limit or the number of damages at the diagonal positions on the blades exceeds the limit, return the cold-end components to the factory for replacement. If neither exceeds the limit, proceed to step S22;

[0025] S22. Identify the damaged blades and the blades on the opposite side of the rotor corresponding to the damaged blades as the target repair blades.

[0026] As a further improvement of the above technical solution, when marking the target repair blades, auxiliary marking is carried out through a template; the contour of the template matches the blade profile contour, and the template is used to be placed against the back profile surface of the blade; marking lines are respectively provided on the template corresponding to the leading edge position, trailing edge position, and tip position of the blade; when carrying out auxiliary marking through the template, place the template against the back profile surface of the blade, and use a marking tool to set marking lines on the damaged parts of the target repair blades through the template.

[0027] As a further improvement of the above technical solution, when repairing the target repair blades, it specifically includes: removing the excess blade material outside the marked line range through a cutting tool; fixing the support member on one vane of the axial-flow compressor casing on the compressor; rotating the rotor to make the target repair blade located at a position matching the repair component, and restricting the rotation of the rotor through a limiting device; repairing the damaged parts of the target repair blades through the repair component.

[0028] The present invention has the following beneficial effects: The support member of this repair device can be fixedly connected to one vane of the axial-flow compressor casing of the compressor through its connection structure, that is, by removing any half of the axial-flow compressor casing of the compressor and fixing the support member on the unremoved half of the axial-flow compressor casing, the fixation of this repair device on the compressor is completed. There is no need to remove the engine as a whole to take out the blades, avoiding cumbersome disassembly steps and improving the repair efficiency; after installing this repair device, rotate the rotor to adjust the blade to an appropriate position matching the repair component, and the rotation of the rotor can be restricted by the limiting component to keep the blade fixed at the current position, and the damaged blade is repaired by the repair component; by using this repair device to repair the damaged blade, the blade can be repaired under the condition of only removing half of the axial-flow compressor casing, realizing the direct repair of the compressor in the field, avoiding a large number of component disassembly during factory return, reducing costs, and greatly improving the maintenance efficiency.

[0029] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the accompanying drawings to make a further detailed description of the present invention. Description of the Drawings

[0030] The accompanying drawings, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 is a schematic structure of a preferred embodiment of the present invention Figure 1 ;

[0032] Figure 2 is a schematic structure of a preferred embodiment of the present invention Figure 2 ;

[0033] Figure 3 is a schematic structure of a preferred embodiment of the present invention Figure 2 ;

[0034] Figure 4 is a cross-sectional view of a preferred embodiment of the present invention;

[0035] Figure 5 is a schematic structural diagram of a guiding component and an insurance component of a preferred embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of a moving rod of a preferred embodiment of the present invention;

[0037] Figure 7 is a schematic structural diagram of a pressing member of a preferred embodiment of the present invention;

[0038] Figure 8 is a cross-sectional view of a pressing member of a preferred embodiment of the present invention;

[0039] Figure 9 is a schematic structural diagram of a repair tool and an insurance component of a preferred embodiment of the present invention;

[0040] Figure 10 is a reference diagram of the use state of a preferred embodiment of the present invention;

[0041] 1. Support member 11. Support section 111. Installation groove 12. Connection plate 121. Connection hole 2. Limit component 21. Fixed block 211. Guide hole 22. Moving rod 221. First fitting section 222. Second fitting section 223. Connection section 224. Adjustment section 23. Adjusting member 24. Pressing member 241. Rotational fitting hole 2411. Threaded section 2412. Movable section 242. Rubber pad 3. Repair tool 4. Guiding component 41. Moving member 411. Groove 42. Mounting member 43. Fitting member 431. Guide groove 44. Locking member 5. Insurance component 51. Insurance plate Detailed implementation manners

[0042] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0043] Referring to Figures 1 to 10 , a preferred embodiment of the present invention provides a repair device for damaged compressor blades, which is used to repair damaged compressor blades in the engine assembly state, and includes:

[0044] A support member 1, which is used to be fixed inside the compressor after windowing. The support member 1 has a connection structure, and the connection structure is used to fixedly connect with one vane of the axial-flow compressor casing;

[0045] A limiting component 2, which is installed on the support member 1 and is used to limit the rotation of the rotor of the compressor so as to prevent the blades of the compressor from rotating with the rotor;

[0046] A repair component, which is installed on the support member 1 and is used to repair the damaged blades;

[0047] It should be noted that the casing of the compressor in this preferred embodiment can be split into two vane axial-flow compressor casings;

[0048] It can be understood that the support member 1 of the repair device can be fixedly connected to one vane of the axial-flow compressor casing through its connection structure, that is, by removing any one vane of the axial-flow compressor casing and fixing the support member 1 on the undismantled vane of the axial-flow compressor casing, the fixation of the repair device on the compressor is completed. There is no need to remove the engine as a whole to take out the blades, avoiding cumbersome disassembly steps and improving the repair efficiency; after installing the repair device, rotate the rotor to adjust the blade to an appropriate position matching the repair component, and the rotation of the rotor can be restricted by the limiting component 2 to keep the blade fixed at the current position, and the damaged blade can be repaired by the repair component; by using the repair device to repair the damaged blade, the blade can be repaired under the condition of only removing one vane of the axial-flow compressor casing, realizing the direct repair of the compressor in the field, avoiding a large number of component disassembly during returning to the factory, reducing costs and greatly improving the maintenance efficiency.

[0049] In this embodiment, the support member 1 includes an arc-shaped support section 11. The support section 11 has a concave surface, that is, an inner arc surface. The radian angle of the inner arc surface of the support section 11 is complementary to the radian angle of the corresponding vane of the axial-flow compressor casing, so as to avoid interference with the blades; the connection structure includes connection plates 12 provided at both ends of the support section 11. The connection plates 12 are provided with connection holes 121. The arrangement positions of the connection holes 121 match the positions of the installation holes of the corresponding vane of the axial-flow compressor casing. The connection plates 12 of the support member 1 are attached to the installation surface of one vane of the axial-flow compressor casing, and are fixed by bolts passing through the connection holes 121 and the holes on the casing installation surface. The inner arc surface of the support member 1 and the inner wall of one vane of the axial-flow compressor casing can be circular;

[0050] It should be understood that in other embodiments, the compressor may also be a compressor with a three-lobe or multi-lobe axial casing, that is, one lobe of the axial casing is removed and retained for the installation of the support member 1;

[0051] In this embodiment, the limiting component 2 includes a fixed block 21 fixedly arranged on the first side surface of the support member 1. A guiding hole 211 is radially formed in the fixed block 21 relative to the axis of the rotor. A moving rod 22 is inserted through the guiding hole 211. A pressing member 24 adapted to the outer ring surface of the rotor is arranged at the first end of the moving rod 22. An adjusting member 23 is arranged at the second end of the moving rod 22. The adjusting member 23 is used to adjust the axial position of the moving rod 22 in the guiding hole 211, so as to press and fix the rotor or move away from the rotor. Specifically, the moving rod 22 is a screw rod, and the guiding hole 211 is a threaded hole. The screw rod is threadedly connected to the guiding hole 211. The small end of the screw rod is connected to the pressing member 24. By rotating the screw rod, the radial relative position between the pressing member 24 and the inner wall of the support member 1 can be adjusted, so that it can move away from or towards the rotor and can press against the rotor to prevent rotation. A rotating mating hole 241 adapted to the small end of the screw rod is arranged at the connecting end of the pressing member 24. When the position of the screw rod is rotated and adjusted, the small end of the screw rod rotates in the rotating mating hole 241, and the pressing member 24 only moves radially along the support block. Based on this, the movable end of the pressing member 24 has an arc-shaped end surface adapted to the outer peripheral surface of the rotor. A rubber pad 242 is arranged on the arc-shaped end surface to increase friction and avoid dry contact, preventing the compressor rotor from being damaged. To facilitate applying force to rotate the screw rod, the adjusting member 23 is preferably a handle arranged at the large end of the screw rod;

[0052] Among them, the moving rod 22 successively includes a first fitting section 221, a second fitting section 222, a connecting section 223, and an adjusting section 224; the rotation fitting hole 241 of the pressing member 24 has a threaded section 2411 and a movable section 2412. The outer wall of the first fitting section 221 is provided with an external thread. The threaded section 2411 has an internal thread adapted to the first fitting section 221. The aperture of the movable section 2412 is smaller than the outer diameter of the first fitting section 221, and the height of the movable section 2412 is greater than or equal to the height of the first fitting section 221. The outer diameter of the second fitting section 222 is smaller than the aperture of the threaded section 2411. After screwing the first fitting section 221 into the rotation fitting hole 241 from the threaded section 2411 to the movable section 2412, the first fitting section 221 can rotate in the movable section 2412 along the screwing direction without coming out, and at the same time, the second fitting section 222 can rotate in the fitting section without interference; the connecting section 223 has an external thread for cooperating with the internal thread of the guiding hole 211, thereby adjusting the position of the moving rod 22; the adjusting section 224 is used to rotate the moving rod 22 for adjustment, or is used to install an external adjusting member 23 for rotational adjustment; based on the structure of the moving rod 22, after the moving rod 22 is screwed into the guiding hole 211, the first fitting section 221 of the moving rod 22 can be screwed into the threaded section 2411 of the pressing member 24 until it enters the movable section 2412 to complete the assembly;

[0053] Further, the end face of the first fitting section 221 is an arc-shaped end face, which reduces the contact with the end face of the rotation fitting hole 241, reduces friction, and makes the rotation smoother;

[0054] Further, the helix direction of the external thread of the connecting section 223 of the moving rod 22 is the same as that of the external thread of the first fitting section 221, that is, when rotating and adjusting the moving rod 22 to move towards the rotor direction, the first fitting section 221 remains idling in the movable section 2412 without coming out of the rotation fitting hole 241;

[0055] It can be understood that the limiting component 2 is arranged at the middle position of the support member 1. When the screw rotates to make the pressing member 24 press on the rotor, the two sides of the support member 1 are evenly stressed, ensuring stable support and stable limitation of the rotor;

[0056] In this embodiment, the repair component includes a repair tool 3 and a guiding component 4. The guiding component 4 includes a bracket and a locking member 44. The support member 1 is provided with an installation groove 111 for passing through the bracket. The opening direction of the installation groove 111 is parallel to the axial direction of the rotor; the locking member 44 is used to fix the bracket in the installation groove 111; one end of the bracket is provided with a guiding groove 431 for guiding the repair tool 3 to the blade for repair;

[0057] In this embodiment, the repair tool 3 is taken as a file, and in other embodiments, it can also be other repair tools 3. The file in this embodiment grinds the three surfaces to be smooth along the tooth shape, leaving only one working surface. After fixing the rotor through the limiting component 2, the bracket is moved in the installation groove 111 to adjust the axial position relative to the rotor, so that the guiding groove 431 is adapted to the axial position of the target repair blade. Then, the bracket is fixed in the installation groove 111 through the locking member 44. After that, the file can be used to repair the damaged position of the blade along the guiding groove 431. Due to frequent frictional contact with the file during the working process, the guiding groove 431 of the bracket is made of cemented carbide material, which has good wear resistance.

[0058] Specifically, the bracket includes a moving member 41, a mounting member 42, and a fitting member 43. The moving member 41 is in a long strip shape and is used to pass through and cooperate with the installation groove 111. A groove 411 is formed on the moving member 41 along its moving direction for cooperating with the end of the locking member 44, so that the end of the locking member 44 is embedded in the groove 411 to improve the fixing effect. The mounting member 42 is connected to the end of the moving member 41, and the fitting member 43 is mounted on the mounting member 42. The guiding groove 431 is provided on the fitting member 43. Based on this, the fitting member 43 is made of cemented carbide material, and the fitting member 43 can be replaced according to different sizes and types of repair tools 3 to cooperate with the corresponding repair tools 3.

[0059] Among them, the guiding component 4 is located on the second side surface of the support member 1, so that interference with the limiting component 2 provided on the first side surface of the support member 1 can be avoided during use. In addition, the circumferential setting position of the guiding component 4 on the support member 1 is different from that of the limiting component 2, making its setting position more convenient for applying force and the operation more convenient.

[0060] In this embodiment, the repair component further includes a safety component 5 for restricting the moving length of the repair tool 3 towards the blade. Among them, the safety component 5 includes two safety plates 51, which are used to clamp and fix on the file. When the file moves to a certain depth in the guiding groove 431, the safety component 5 abuts against the bracket. Then, the feeding depth of the file can be restricted by controlling the clamping position of the safety component 5, avoiding damage to the engine caused by the file feeding too long and hitting parts such as the casing and blade root.

[0061] On the other hand, a preferred embodiment of the present invention also provides a method for repairing a damaged compressor blade, which is applied to the repair device of this preferred embodiment and includes the following steps:

[0062] S1. Check the damage degree of the blade;

[0063] Specifically, it includes:

[0064] S11. Wear protective tools, such as protective gloves, to prevent being cut by sharp blades during operation. After wearing the protective tools, remove and retain one lobe of the axial-flow casing on the compressor.

[0065] S12. Rotate the compressor rotor to drive the blades to rotate, and check in sequence whether all the blades are damaged by foreign objects; observe the rotor blades inside the compressor through the exposed positions removed by the casing, and rotate the rotor to observe all the blades in sequence;

[0066] S2. Determine the target repair blades;

[0067] Among them, step S2 specifically includes:

[0068] S21. Judge the number of damaged blades and the number of damages at the diagonal positions on the blades. If the number of damaged blades exceeds the limit or the number of damages at the diagonal positions on the blades exceeds the limit, return to the factory to replace the cold-end components. If neither exceeds the limit, go to step S22;

[0069] Specifically, check all the blades of the first-stage rotor of the compressor in sequence. If foreign objects damage more than 4 sets of diagonal blades (a total of 8 blades) in the 1st-stage rotor blades of the compressor, or the diagonal positions on the paired blades of the first-stage rotor of the compressor are damaged by foreign objects more than 4 places (a total of 8 places), then it does not meet the repair conditions and the cold-end component module needs to be replaced;

[0070] S22. Determine the damaged blades and the blades on the opposite side of the damaged blades on the rotor as the target repair blades. In order to maintain the balance of the compressor rotor, the blades in the 180° direction of the damaged blades must remove an equal amount of material. Therefore, the blades on the opposite side are also used as the target repair blades;

[0071] S3. Mark the target repair blades;

[0072] Specifically, when marking the target repair blades, use a template for auxiliary marking; the contour of the template matches the profile of the blade, and the template is used to fit and place on the back profile of the blade; there are scoring lines respectively set at the leading edge position, trailing edge position and tip position of the blade corresponding to the template; when using the template for auxiliary marking, place the template on the back profile of the blade, and use a marking tool to set marking lines on the damaged parts of the target repair blades through the template;

[0073] S4. Repair the target repair blades.

[0074] In this embodiment, when repairing the target repair blades, it specifically includes:

[0075] S41. Use a cutting tool to remove the excess blade material outside the marked line range;

[0076] Use a cutting shear to remove the excess blade material close to the marked line. To avoid excessive removal, the cutting shear should be close to the marked line rather than cut along the marked line;

[0077] S42. Fix the support member 1 to one vane of the axial-flow compressor casing;

[0078] That is, fit the connecting plate 12 of the support member 1 to the mounting surface of the undismantled vane of the axial-flow compressor casing, and after passing bolts through the connecting holes 121 and the holes in the casing mounting surface, tighten and fix them. The inner arc surface of the support member 1 and the inner wall of one vane of the casing surround a circle;

[0079] S43. Rotate the rotor to make the target repair blade located at a position matching the repair assembly, and restrict the rotation of the rotor through the limiting device;

[0080] Drive the screw to rotate through the handle, and then make the screw move axially toward the rotor along the guiding hole 211, thereby driving the pressing member 24 to press the rotor, restricting the rotation of the rotor, and keeping the target repair blade located at a position matching the repair assembly;

[0081] S44. Repair the damaged part of the target repair blade through the repair assembly;

[0082] Specifically, assemble the insurance component 5 on the rough file, and grind the damaged part of the blade to the marked line position through the guiding groove 431;

[0083] S45. Grind the blade;

[0084] Specifically, replace the fine file to grind to make the surface of the repaired position of the blade smooth. Then loosen the locking member 44, move the bracket to avoid obstruction and interference, and use a 220-grit emery cloth or other fine emery cloth torn into narrow strips to repeatedly pull and rub around the leading edge of the target repair blade for grinding;

[0085] S46. Remove the remaining material;

[0086] Specifically, use dry and filtered compressed air to remove the chip scraps generated inside and outside the engine due to grinding;

[0087] S45. Repeat steps S3 - S4 until the repair of all target repair blades is completed.

[0088] This repair method evaluates and determines the damage degree of the blade to decide whether the blade can be repaired according to this repair method. If it cannot be repaired, it will be returned to the factory for replacing the cold-end components. If it can be repaired, a template corresponding to the blade is used to assist in marking along the leading edge of the template, and the part of the blade leading edge outside the marked range is determined as the part to be removed. By applying the aforementioned repair device, with only part of the axial flow casing removed, the repair device is fixed on the non-removed casing of the compressor. The rotation angle of the rotor is adjusted to make the blade in an appropriate position, and the repair device presses and fixes the rotor to fix the position of the blade. Then, the damaged part of the blade is removed and ground by the repair component. There is no need to completely remove the engine to take out the blade, the assembly operation is simple, there is no need to disassemble parts on a large scale, the on-site repair of the compressor is realized, transportation and handling are avoided, and the work efficiency is greatly improved.

[0089] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A compressor blade impact repair device, characterized in that, For repairing damaged compressor blades in the engine assembly state, including: A support member (1) for being fixed inside the compressor after the window is opened. The support member (1) has a connection structure for fixedly connecting with one lobe of the axial-flow casing of the compressor. The support member (1) includes a support section (11). The support section (11) has a concave surface for avoiding the internal structure of the compressor. The connection structure includes connection plates (12) provided at both ends of the support section (11). The connection plates (12) are provided with connection holes (121). The arrangement positions of the connection holes (121) match the positions of the mounting holes of the corresponding lobe of the axial-flow casing. A limiting component (2) is installed on the support member (1) for restricting the rotation of the rotor of the compressor, thereby preventing the blades of the compressor from rotating with the rotor. The limiting component (2) includes a fixed block (21) fixedly provided on the first side surface of the support member (1). A guiding hole (211) is radially opened on the fixed block (21) relative to the axis of the rotor. A moving rod (22) is inserted through the guiding hole (211). The first end of the moving rod (22) faces the rotor and is provided with a pressing member (24) adapted to the outer ring surface of the rotor. The second end of the moving rod (22) is provided with an adjusting member (23). The adjusting member (23) is used to adjust the axial position of the moving rod (22) in the guiding hole (211), so that the pressing member (24) presses and fixes the rotor or moves away from the rotor. A repair component is installed on the support member (1) for repairing the damaged blades.

2. The compressor blade impact repair device according to claim 1, wherein The repair component includes a repair tool (3) and a guiding component (4). The guiding component (4) includes a bracket and a locking member (44). The support member (1) is provided with a mounting groove (111) for passing through the bracket. The opening direction of the mounting groove (111) is parallel to the axial direction of the rotor. The locking member (44) is used to fix the bracket in the mounting groove (111). One end of the bracket is provided with a guiding groove (431) for guiding the repair tool (3) to the blade for repair.

3. The compressor blade impact repair device according to claim 2, characterized in that, The repair component further includes a safety component (5) for restricting the moving length of the repair tool (3) towards the blade.

4. A method for repairing a damaged compressor blade, characterized in that, Applied to the compressor blade damage repair device according to any one of claims 1-3, the repair method includes the following steps: S1. Check the damage degree of the blade; S2. Determine the target repair blade; S3. Mark the target repair blade; S4. Repair the target repair blade.

5. The method for repairing the damaged compressor blade according to claim 4, wherein When checking the damage degree of the blade, specifically including: S11. Remove and retain one lobe of the axial-flow casing on the compressor; S12. Rotate the compressor rotor to drive the blade to rotate, and check in sequence whether all the blades are damaged.

6. The method for repairing a damaged compressor blade according to claim 4, wherein When determining the target repair blade, specifically including: S21. Determine the number of damaged blades and the number of damages at the diagonal positions on the blades. If the number of damaged blades exceeds the limit or the number of damages at the diagonal positions on the blades exceeds the limit, return the cold end components to the factory for replacement. If neither exceeds the limit, go to step S22; S22. Identify the damaged blades and the blades on the opposite side of the rotor corresponding to the damaged blades as the target repair blades.

7. The method for repairing the damaged compressor blade according to claim 4, wherein, When marking the target repair blades, use a template for auxiliary marking; the contour of the template matches the blade profile, and the template is used to be placed against the back surface profile of the blade; scale lines are respectively provided on the template corresponding to the leading edge position, trailing edge position, and tip position of the blade; When using the template for auxiliary marking, place the template against the back surface profile of the blade, and use a marking tool to set a marking line on the damaged part of the target repair blade through the template.

8. The method for repairing a damaged compressor blade according to claim 7, wherein When repairing the target repair blades, it specifically includes: removing the excess blade material outside the marked line range with a cutting tool; fixing the support member (1) on one lobe of the axial flow casing on the compressor; rotating the rotor to make the target repair blade located at a position matching the repair assembly, and restricting the rotation of the rotor with a limiting device; repairing the damaged part of the target repair blade with the repair assembly.

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