Intelligent in-situ grinding and maintaining device for aero-engine blade and operation method

Abstract

The invention discloses an intelligent in-situ grinding and maintaining device for aero-engine blades and an operation method. The intelligent in-situ grinding and maintaining device comprises a driving mechanism, a grinding mechanism and a tripod structure, wherein the driving mechanism and the grinding mechanism achieve four-degree-of-freedom movement, and the tripod structure is used for supporting the grinding mechanism and the driving mechanism. Fine control over in-situ grinding maintenance can be achieved through the motor sliding table and the steering engine, multi-degree-of-freedom movement and intelligent grinding maintenance of the grinding device are achieved, and the problems that the manual grinding process is rough and the grinding precision is low can be effectively solved; the working intensity of polishing and maintaining engineers can be reduced, the in-situ polishing and maintaining efficiency of the aero-engine blade is improved, the problems that current in-situ polishing and maintaining equipment for the aero-engine blade is short and the operability of the equipment is poor are solved, the polishing and maintaining time of the aero-engine blade can be greatly shortened, the maintaining efficiency is improved, and the maintaining economic cost is reduced. The maintenance capability of airline companies is improved.

Description

Technical Field

[0001] The present invention relates to the field of in-situ grinding and repair of aero-engine blades, and specifically to an intelligent in-situ grinding and repair device and operation method for aero-engine blades. Background Technique

[0002] Aero-engine blades work under harsh environments and complex loads for a long time, with extremely high working speeds, and are prone to damage caused by foreign objects such as sand and stones. Common damages to aero-engine blades include tearing, pits, scratches, notches, chipping, and corrosion, etc. The occurrence of these damages will affect the working efficiency of aero-engines, and even pose a threat to the safety of aero-engines and aero-planes. Therefore, the repair of damaged aero-engine blades is very important. Sending the blades for off-site repair consumes a long cycle, has high repair costs, low repair efficiency, and also generates aircraft grounding costs. Therefore, it is very necessary to study the in-situ repair technology of aero-engine blades without disassembly, which helps to shorten the repair time, improve the repair efficiency, and reduce the repair economic cost, and has important application value.

[0003] The in-situ grinding and repair technology of aero-engine blades is to perform grinding on the damaged parts of the blades to achieve the purpose of eliminating stress concentration and inhibiting crack propagation. At present, the in-situ grinding and repair of aero-engine blades are all manual operations, with rough grinding processes, low repair efficiency, high labor intensity of personnel, difficult control of grinding accuracy, high technical requirements for in-situ grinding and repair engineers of blades, and high training costs for professional in-situ grinding and repair engineers of blades. In addition, there is a lack of in-situ grinding and repair equipment for aero-engine blades, the operability of the equipment is poor, and it is easy to cause secondary damage to aero-engine blades. Therefore, it is very important to develop an intelligent in-situ grinding and repair device for aero-engine blades to solve the above problems.

[0004] The Chinese patent document with the publication number of CN 213889482 U disclosed an "in-situ grinding manipulator for aero-engine blades" on August 6, 2021, which uses a robotic arm to replace manual grinding, but does not describe the grinding device entering the aero-engine, so it cannot be used for the situation of repairing blades without disassembling the aero-engine. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose an intelligent in-situ grinding and repair device and operation method for aero-engine blades.

[0006] The present invention adopts the following technical solutions to achieve the above purpose: An intelligent in-situ grinding and repair device for aero-engine blades, comprising a driving mechanism and a grinding mechanism that realize four-degree-of-freedom movement, and a tripod structure for supporting the grinding mechanism and the driving mechanism, wherein: The driving mechanism includes a chassis 1, a four-degree-of-freedom platform 2, a torque sensor assembly 3, and a bottom plate 6.

[0007] The grinding mechanism includes a quick-release fixture 4, a grinding device 5, and a grinding mechanism support 7.

[0008] The selected tripod structure includes a tripod main body 8 and a handle 9.

[0009] Preferably, the chassis 1 includes an upper chassis cover 101, an industrial display installation groove 102, and a chassis bottom plate 103. The chassis bottom plate 103 is used to support the four-degree-of-freedom platform 2.

[0010] Preferably, the four-degree-of-freedom platform includes a first x-axis slide 201, a second x-axis slide 202, an L-shaped connecting member 203, a y-axis slide 204, a z-axis slide 205, a mounting block 206, a damping ball hinge 207, a servo 208, a servo mounting box upper cover 209, a servo mounting box rear cover 210, a servo mounting box lower cover 211, a slide screw 212, a slide motor 213, a slide slider 214, and a slide rail 215. The z-axis slide 205 and the servo mounting box rear cover 210 are connected by a damping ball hinge 207.

[0011] Preferably, the first x-axis slide 201 and the second x-axis slide 202 have a stroke of 100 mm, the y-axis slide 204 and the z-axis slide 205 have a stroke of 50 mm, and the movement range of the servo 208 is 0° to 360°.

[0012] Preferably, the lead of the slide screw 212 is 1 mm, and the slide motor 213 is a 28 mm stepper motor.

[0013] Preferably, the bottom plate 6 includes a left bracket 601, a middle cross plate 602, and a right bracket 603.

[0014] Preferably, the torque sensor assembly 3 includes a connecting member 301 between the servo and the torque sensor, a torque sensor 302, and a connecting block 303 between the torque sensor and the quick-release fixture.

[0015] Preferably, the quick-release fixture 4 includes a quick-insert interface 401 at the left end, a double-spring buckle 402 in the middle section, a fixture one 403, a hinge one 404 in the middle section, a fixture two 405, and a hinge two 406 at the right end. The hinge one 404 and the hinge two 406 connect the fixture one 403 and the fixture two 405 together, and the double-spring buckle 402 clamps the fixture one 403 and the fixture two 405.

[0016] Preferably, the grinding device 5 includes a grinding head pitch angle adjustment knob 501, a conduit 502, a grinding head 503, a rotational speed adjustment knob 504, and a torque adjustment knob 505. The rotational speed adjustment knob 504 is connected to the motor rotational speed adjustment module inside the grinding device 5, and the torque adjustment knob 505 is connected to the motor torque adjustment module inside the grinding device 5.

[0017] Preferably, the adjustment range of the grinding head pitch angle adjustment knob 501 is 0° to 180°, the adjustment range of the rotational speed adjustment knob 504 is 0 to 30000 rpm, and the adjustment range of the torque adjustment knob 505 is 0 to 2000 mN∙m.

[0018] Preferably, the grinding mechanism bracket 7 includes a combined bearing 701, a bracket main body 702, a support mechanism mounting port 703, a linear bearing 704, and a spherical plain bearing 705.

[0019] An operation method of an intelligent in-situ grinding and maintenance device for aeroengine blades includes the following steps: S1. Blade damage location: Use an endoscope to inspect the damage of the aeroengine blade through the borescope port, evaluate whether maintenance is required, and record the damage location and size. S2. Initial attitude adjustment of the in-situ grinding and maintenance device: Adjust the grinding head angle to 0° through the grinding head pitch angle adjustment knob 501d, adjust the sliders of the first x-axis slide 201 and the second x-axis slide 202 to 50 mm, adjust the sliders of the y-axis slide 204 and the z-axis slide 205 to 25 mm, adjust the servo motor 208 to the 180° position, and ensure that the grinding device 5 is parallel to the middle cross plate 602 of the bottom plate after adjustment. S3. The grinding device enters the engine: Enter the grinding device into the engine through the borescope port of the stage where the damaged blade is located, and adjust the grinding head angle to 85° through the grinding head pitch angle adjustment knob 501d. S4. Grinding device position adjustment: Combine the endoscope and roughly adjust the position and attitude of the grinding device by adjusting the tripod handle 9. After the rough adjustment, finely adjust the position and attitude of the grinding device by adjusting the four-degree-of-freedom platform 2, and ensure that the grinding head is perpendicular to the blade edge after adjustment. S5. In-situ grinding and maintenance operation: Adjust the rotational speed adjustment knob 504 and the torque adjustment knob 505 to appropriate rotational speed and torque, and the program drives the four-degree-of-freedom platform 2 to perform blade grinding and maintenance. Combine the endoscope to observe the damage grinding situation in real time, measure the dimensional parameters of the grinding profile, and evaluate whether they meet the requirements of the manual. S6. End of maintenance operation: Adjust the speed adjustment knob 504 and the torque adjustment knob 505 to the minimum, turn off the power supplies of the grinding device 5 and the four-degree-of-freedom platform 2, adjust the angle of the grinding head to 0° through the grinding head pitch angle adjustment knob 501d, withdraw the grinding device 5 from the inspection port, and complete the in-situ grinding repair work of the damaged blade.

[0020] The beneficial effects of the present invention are as follows: (1) By using a tripod and a four-degree-of-freedom platform, the present invention constructs an intelligent in-situ grinding repair device for aero-engine blades, which can effectively reduce the working intensity of grinding repair engineers and improve the in-situ grinding repair efficiency of aero-engine blades; (2) The present invention can achieve refined control of in-situ grinding repair through a motorized slide table and a servo motor, realize multi-degree-of-freedom movement of the grinding device and intelligent grinding repair, and can effectively solve the problems of rough manual grinding process and low grinding accuracy; (3) The present invention effectively solves the problems of lack of in-situ grinding repair equipment for current aero-engine blades and poor operability of the equipment, can greatly shorten the grinding repair time of aero-engine blades, improve the repair efficiency and reduce the repair economic cost, and improve the maintenance ability of airlines. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the driving mechanism and the grinding mechanism of the present invention in cooperation; Figure 3 is a schematic diagram of the structure of the driving mechanism of the present invention; Figure 4 is a schematic diagram of the structure of the quick-release fixture of the grinding mechanism of the present invention; Figure 5 is a schematic diagram of the structure of the grinding device of the present invention; Figure 6 is a schematic diagram of the structure of the support of the grinding mechanism of the present invention; Figure 7 is a schematic diagram of the operation method flow of an intelligent in-situ grinding repair device for aero-engine blades of the present invention.

[0022] Reference Numerals: 1, chassis; 101, upper cover of the chassis; 102, installation groove for industrial display screen; 103, chassis bottom plate; 2, four-degree-of-freedom motion platform; 201, first x-axis slide; 202, second x-axis slide; 203, L-shaped connecting member; 204, y-axis slide; 205, z-axis slide; 206, mounting block; 207, damping ball hinge; 208, steering gear; 209, upper cover of the steering gear installation box; 210, rear cover of the steering gear installation box; 211, lower cover of the steering gear installation box; 212, slide screw; 213, slide motor; 214, slide slider; 215, slide rail; 3, torque sensor assembly; 301, connecting member between the steering gear and the torque sensor; 302, torque sensor; 303, connecting block between the torque sensor and the quick-release fixture; 4, quick-release fixture; 401, quick-insert interface; 402, double-spring buckle; 403, fixture one; 404, hinge one; 405, fixture two; 406, hinge two; 5, grinding device; 501, grinding head pitch angle adjustment knob; 502, conduit; 503, grinding head; 504, rotation speed adjustment knob; 505, torque adjustment knob; 6, bottom plate; 601, left bracket; 602, middle cross plate; 603, right bracket; 7, grinding mechanism bracket; 701, combined bearing; 702, bracket main body; 703, support mechanism installation port; 704, linear bearing; 705, spherical plain bearing; 8, tripod main body; 9, handle. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the field to which the present invention belongs.

[0025] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:

[0026] As Figure 1 shown, an intelligent in-situ grinding and repairing device for aeroengine blades includes a driving mechanism for realizing four degrees of freedom of motion, a grinding mechanism, and a tripod structure for supporting the grinding mechanism and the driving mechanism, wherein: the driving mechanism includes a chassis 1, a four-degree-of-freedom platform 2, a torque sensor assembly 3, and a bottom plate 6. The grinding mechanism includes a quick-release fixture 4, a grinding device 5, and a grinding mechanism bracket 7. The tripod structure includes a tripod main body 8 and a handle 9.

[0027] As Figure 1 and Figure 2 shown, the chassis 1 includes a chassis upper cover 101, an industrial display installation groove 102, and a chassis bottom plate 103. The chassis bottom plate 103 is used to support the four-degree-of-freedom platform 2.

[0028] As Figure 2 shown, the four-degree-of-freedom platform includes a first x-axis slide 201, a second x-axis slide 202, an L-shaped connecting piece 203, a y-axis slide 204, a z-axis slide 205, a mounting block 206, a damping ball hinge 207, a servo 208, a servo mounting box upper cover 209, a servo mounting box rear cover 210, a servo mounting box lower cover 211, a slide screw 212, a slide motor 213, a slide slider 214, and a slide rail 215. The z-axis slide 205 and the servo mounting box rear cover 210 are connected by a damping ball hinge 207. Among them, the stroke of the first x-axis slide 201 and the second x-axis slide 202 is 100 mm, the stroke of the y-axis slide 204 and the z-axis slide 205 is 50 mm, and the movement range of the servo 208 is 0° to 360°. And the lead of the slide screw 212 is 1 mm, and the slide motor 213 is a 28 mm stepper motor.

[0029] As Figure 2 shown, the torque sensor assembly 3 includes a connecting piece 301 between the servo and the torque sensor, a torque sensor 302, and a connecting block 303 between the torque sensor and the quick-release fixture. In addition, the bottom plate 6 includes a left bracket 601, a middle cross plate 602, and a right bracket 603.

[0030] As Figure 4 shown, the quick-release fixture 4 includes a quick-insert interface 401, a double-spring buckle 402, a fixture one 403, a hinge one 404, a fixture two 405, and a hinge two 406.

[0031] As Figure 5 shown, the grinding device 5 includes a grinding head pitch angle adjustment knob 501, a conduit 502, a grinding head 503, a rotation speed adjustment knob 504, and a torque adjustment knob 505. Among them, the adjustment range of the grinding head pitch angle adjustment knob 501 is 0° to 180°, the adjustment range of the rotation speed adjustment knob 504 is 0 to 30000 rpm, and the adjustment range of the torque adjustment knob 505 is 0 to 2000 mN∙m.

[0032] As Figure 6 shown, the grinding mechanism bracket 7 includes a combined bearing 701, a bracket main body 702, a support mechanism installation port 703, a linear bearing 704, and a spherical plain bearing 705.

[0033] Example 2:

[0034] AsFigure 7 As shown in Figure 7 , based on the grinding and repair device provided in Embodiment 1, this embodiment is an operation method of an intelligent in-situ grinding and repair device for aero-engine blades, including the following steps: S1. Blade damage positioning: Use an endoscope to inspect the damage of aero-engine blades through the borescope port, evaluate whether repair is needed, and record the damage position and size; S2. Initial attitude adjustment of the in-situ grinding and repair device: Adjust the angle of the grinding head to 0° through the grinding head pitch angle adjustment knob 501d, adjust the sliders of the first x-axis slide 201 and the second x-axis slide 202 to 50 mm, adjust the sliders of the y-axis slide 204 and the z-axis slide 205 to 25 mm, adjust the servo 208 to the 180° position, and ensure that the grinding device 5 is parallel to the middle cross plate 602 of the bottom plate after adjustment; S3. The grinding device enters the engine: Enter the grinding device into the engine through the borescope port at the stage where the damaged blade is located, and adjust the angle of the grinding head to 85° through the grinding head pitch angle adjustment knob 501d; S4. Grinding device position adjustment: Combine the endoscope to roughly adjust the position and attitude of the grinding device by adjusting the tripod handle 9. After the rough adjustment is completed, finely adjust the position and attitude of the grinding device by adjusting the four-degree-of-freedom platform 2, and ensure that the grinding head is perpendicular to the blade edge after adjustment; S5. In-situ grinding and repair operation: Adjust the speed adjustment knob 504 and the torque adjustment knob 505 to appropriate speeds and torques, and the program drives the four-degree-of-freedom platform 2 to perform blade grinding and repair. Combine the endoscope to observe the damage grinding situation in real time, measure the size parameters of the grinding profile, and evaluate whether they meet the requirements of the manual; S6. End of the repair operation: Adjust the speed adjustment knob 504 and the torque adjustment knob 505 to the minimum, turn off the power supplies of the grinding device 5 and the four-degree-of-freedom platform 2, adjust the angle of the grinding head to 0° through the grinding head pitch angle adjustment knob 501d, and withdraw the grinding device 5 from the borescope port to complete the in-situ grinding and repair work of the damaged blade.

[0035] In summary, the present invention proposes an intelligent in-situ grinding and repair device and operation method for aero-engine blades. By using a tripod and a four-degree-of-freedom platform to construct an intelligent in-situ grinding and repair device, it can effectively reduce the work intensity of grinding and repair engineers and improve the repair efficiency; through the motor slide and the servo, it realizes the refined control of in-situ grinding and repair and realizes intelligent grinding and repair, which can effectively solve the problems of rough manual grinding process and low grinding accuracy. The present invention effectively solves the problems of lack of in-situ grinding and repair equipment for current aero-engine blades and poor operability of the equipment, can greatly shorten the grinding and repair time of aero-engine blades, improve the repair efficiency and reduce the repair economic cost, and improve the repair ability of airlines.

[0036] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent in-situ grinding and repair device for aero-engine blades, characterized in that: It includes a driving mechanism and a grinding mechanism that achieve four-degree-of-freedom motion, as well as a tripod structure for supporting the grinding mechanism and the driving mechanism, where: The driving mechanism includes a chassis (1), a four-degree-of-freedom platform (2), a torque sensor assembly (3), and a base plate (6); the grinding mechanism includes a quick-release fixture (4), a grinding device (5), and a grinding mechanism bracket (7); the selected tripod structure includes a tripod body (8) and a handle (9); The top of the tripod body (8) is connected to the base plate of the chassis base plate (103). The four-degree-of-freedom platform (2) is installed on the chassis base plate (103). The edge of the chassis base plate (103) is connected to the base plate. The power output end of the four-degree-of-freedom platform (2) is sequentially connected to the torque sensor assembly (3), the quick-release fixture (4), and the grinding device (5).

2. The intelligent in-situ grinding and maintenance device for an aero-engine blade according to claim 1, wherein: The four-degree-of-freedom platform includes two x-axis slides arranged side by side: a first x-axis slide (201) and a second x-axis slide (202). Each x-axis slide is provided with a slide rail (215). A slide screw (212), a slide motor (213), and a slide slider (214) are installed in the slide rail (215); a y-axis slide (204) is connected to each slide slider (214) through an L-shaped connecting piece (203); a z-axis slide (205) is connected to one of the x-axis slides. An installation block (206), a damping ball hinge (207), and a servo motor (208) are sequentially connected to the z-axis slide (205) through a z-axis slide rail.

3. The intelligent in-situ grinding and repair device for an aero-engine blade according to claim 2, characterized in that: The torque sensor assembly (3) includes a connecting piece (301), a torque sensor (302), and a connecting block (303) between the torque sensor and the quick-release fixture, which are connected in sequence; the connecting piece (301) is used to connect the servo motor and the torque sensor.

4. An intelligent in-situ grinding and repair device for aero-engine blades according to claim 1, characterized in that: The quick-release fixture (4) includes a quick-insert interface (401) at the left end, a double-spring buckle (402) in the middle section, a fixture one (403), a hinge one (404) in the middle section, a fixture two (405), and a hinge two (406) at the right end. The hinge one (404) and the hinge two (406) connect the fixture one (403) and the fixture two (405) together, and the double-spring buckle (402) clamps the fixture one (403) and the fixture two (405).

5. The intelligent in-situ grinding and repair device for an aero-engine blade according to claim 1, characterized in that: The grinding device (5) includes a grinding head pitch angle adjustment knob (501), a conduit (502), a grinding head (503), a rotation speed adjustment knob (504), and a torque adjustment knob (505). The rotation speed adjustment knob (504) is connected to the motor rotation speed adjustment module inside the grinding device (5), and the torque adjustment knob (505) is connected to the motor torque adjustment module inside the grinding device (5).

6. The intelligent in-situ grinding and repair device for an aero-engine blade according to claim 1, characterized in that: The base plate (6) includes a left bracket (601), a middle cross plate (602), and a right bracket (603); the end of the right bracket (603) is connected to the grinding mechanism bracket (7). The grinding mechanism bracket (7) includes a combined bearing (701), a bracket body (702), a support mechanism installation port (703), a linear bearing (704), and a spherical plain bearing (705).

7. An intelligent in-situ grinding and repair device for an aero-engine blade according to claim 2, characterized in that: The chassis (1) includes an upper chassis cover (101), an industrial display mounting groove (102) is provided on the chassis, and a chassis bottom plate (103) is provided at the bottom. The chassis bottom plate (103) is used to support the four-degree-of-freedom platform (2).

8. The intelligent in-situ grinding and repair device for aero-engine blades according to claim 4, characterized in that: The stroke of the first x-axis slide (201) and the second x-axis slide (202) is 100 mm, the stroke of the y-axis slide (204) and the z-axis slide (205) is 50 mm, and the movement range of the servo motor (208) is 0° to 360°. The lead of the slide screw (212) is 1 mm, and the slide motor (213) is a 28 mm stepper motor.

9. An intelligent in-situ grinding and repair device for aeroengine blades according to claim 8, characterized in that: The adjustment range of the grinding head pitch angle adjustment knob (501) is 0° to 180°, the adjustment range of the speed adjustment knob (504) is 0 to 30000 rpm, and the adjustment range of the torque adjustment knob (505) is 0 to 2000 mN∙m.

10. An operating method for an intelligent in-situ grinding and maintenance device for aero-engine blades based on the device according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Use an endoscope to inspect the damage of the aero-engine blade through the hole inspection port, evaluate whether repair is needed, and determine the damage position and size; S2. Adjust the grinding head angle to 0°, adjust the sliders of the first x-axis slide (201) and the second x-axis slide (202) to the first set position, adjust the sliders of the y-axis slide (204) and the z-axis slide (205) to the second set position, adjust the servo motor (208) to the 180° position, and ensure that the grinding device (5) is parallel to the middle cross plate (602) of the bottom plate after adjustment; S3. Insert the grinding device into the engine through the hole inspection port of the stage where the damaged blade is located, and adjust the grinding head angle to 85° through the grinding head pitch angle adjustment knob (501); S4. Combine with the endoscope, roughly adjust the position and posture of the grinding device by adjusting the tripod handle (9). After the rough adjustment is completed, finely adjust the position and posture of the grinding device by adjusting the four-degree-of-freedom platform (2), and ensure that the grinding head is perpendicular to the blade edge after adjustment; S5. Adjust the speed and torque, drive the four-degree-of-freedom platform (2) to perform blade grinding and repair, combine with the endoscope to observe the damage grinding situation in real time, measure the size parameters of the grinding profile, and evaluate whether they meet the requirements; S6. Turn off the power supply of the grinding device (5) and the four-degree-of-freedom platform (2), adjust the grinding head angle to 0°, withdraw the grinding device (5) from the hole inspection port, and complete the in-situ grinding and repair work of the damaged blade.

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