Method and tool for in-situ replacement of primary fan rotor blade

Abstract

The invention discloses a method and tool for in-situ replacement of primary fan rotor blades. The tool comprises an installation vehicle body, a motor, an electric push rod, a left-right transverse moving platform, a flow guide cone positioning rod, a bracket, a front-back transverse moving platform, an operation panel, supporting legs, an up-down lifting platform and a blade lifting device, and the blade lifting device comprises a handle, a sliding block and a hook. When primary fan rotor blades are replaced in situ, a front casing of an engine casing is stably placed on the bracket through combined movement of the left-right transverse moving platform, the up-down lifting platform and the front-back transverse moving platform, and the front casing is connected with the fluid director through the fluid guiding cone positioning rod; and then the left-right transverse moving platform is moved reversely, so that the first-stage fan rotor and the front casing are separated from the engine casing together, and finally blades of the first-stage fan rotor are replaced one by one through a blade lifting device. The tool is relatively simple in structure, easy to machine and convenient to operate, and the method of replacing the first-stage blade in situ greatly improves the engine fault repair efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine repair, and in particular relates to a method and tooling for in-situ replacement of a first-stage fan rotor blade. Background Art

[0002] When an aircraft engine is performing a flight mission in the field, if the first-stage fan rotor blades are damaged during use, they need to be returned to the factory to replace the blades. Due to factors such as limited maintenance space, long flight time, and insufficient supply, if the damaged engine is not repaired in time, it will seriously affect the integrity rate and attendance rate. Therefore, the engine should have the ability to replace the first-stage fan rotor blades in situ without disassembling large components. This can save the cost of disassembly, assembly, testing, and transportation, and improve the ground support capability and customer satisfaction. Based on the technical requirements for replacing the first-stage fan rotor blades and combined with the structural characteristics of the engine, the idea of ​​a method and tooling for replacing the first-stage fan rotor blades in situ was proposed. Summary of the invention

[0003] The present invention aims to provide a method and tooling for in-situ replacement of a first-stage fan rotor blade, which can meet the ability of in-situ replacement of a first-stage fan rotor blade, is simple to operate, and has a convenient replacement process.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A tool for in-situ replacement of a first-stage fan rotor blade, comprising:

[0006] A mounting vehicle body with rollers at the lower end;

[0007] An upper and lower lifting platform, which is fixed on the installation vehicle body to achieve lifting and lowering along the height direction of the installation vehicle body and inclination adjustment of the upper and lower lifting platform;

[0008] The left and right lateral movement platform is arranged on the upper end surface of the upper and lower lifting platforms to realize translation along the length direction of the installation vehicle body, and the lower end of the left and right lateral movement platform is installed with a length-adjustable support rod;

[0009] Front and rear transverse moving platforms, which are arranged on the upper end surfaces of the left and right transverse moving platforms to achieve translation along the width direction of the installation vehicle body;

[0010] A bracket, the bracket is mounted on the front and rear transverse platforms, and the bracket has a support surface that is consistent with the outer surface of the front casing of the engine casing so that the front casing is tightly attached to the bracket;

[0011] A guide cone positioning rod, wherein the guide cone positioning rod is installed on the left and right transverse moving platforms through a bracket, and the guide cone positioning rod extends to the top of the bracket along the translation direction of the left and right transverse moving platforms, and the guide cone positioning rod is slidably connected to the bracket;

[0012] A support foot with adjustable length, the support foot being arranged at the lower end of the outer side of the mounting vehicle body;

[0013] The blade lifter comprises a handle, a sliding block and a hook. The handle and the hook are respectively located at two ends of the same rod. The sliding block is slidably connected to the rod between the handle and the hook through its through hole.

[0014] As an option, the upper and lower lifting platforms are connected to the motor via four electric push rods, and the motor drives the four electric push rods to perform different combined actions to achieve the lifting and lowering and inclination adjustment of the upper and lower lifting platforms.

[0015] As an option, the left and right lateral movement platform is connected to the motor through an electric push rod, and the motor drives the electric push rod to achieve the translation of the left and right lateral movement platform.

[0016] As an option, the front and rear transverse moving platforms are slidably connected to the upper end surfaces of the left and right transverse moving platforms via guide rails.

[0017] As an option, the tooling for in-situ replacement of the first-stage fan rotor blades also includes an operating panel, which is mounted on the body of the installation vehicle. The operating panel is electrically connected to the motor to control the start and stop of the motor.

[0018] As an option, the length-adjustable support rod and support foot comprise a lead screw.

[0019] A method for replacing a first-stage fan rotor blade in situ adopts the aforementioned tooling and comprises the following steps:

[0020] S1, push the installation vehicle body into the vicinity of the front casing of the engine casing, use a level and adjust the tooling by adjusting the length of the supporting feet and the inclination angle of the upper and lower lifting platforms, so that the upper and lower lifting platforms of the tooling are consistent with the level of the engine casing;

[0021] S2, move the left and right lateral movement platforms to the bottom of the front casing, manually translate the front and rear lateral movement platforms so that the bracket is located directly under the front casing, raise the upper and lower lifting platforms upwards, and confirm again whether the bracket is aligned with the front casing. If not, manually translate the front and rear lateral movement platforms again. If aligned, continue to raise the upper and lower lifting platforms upwards until the bracket fits with the front casing, remove the engine fan inlet deflector cover, install the deflector cone at the front end of the deflector cone positioning rod, slide the deflector cone positioning rod until the deflector cone at its front end is connected with the engine fan inlet deflector, and then move the left and right lateral movement platforms in the opposite direction so that the front casing and the first-stage fan rotor are separated from the engine casing as a whole;

[0022] S3, hook the hook of the blade lifter onto the root of the blade, hold the handle of the blade lifter at the same time, then quickly move the sliding block to hit the handle to pull the blade out of the blade groove, and replace the first-stage fan rotor blades one by one in situ.

[0023] As an option, in S2, after the left and right lateral moving platforms are moved to below the front receiver, the length-adjustable support rods are adjusted to ensure that the left and right lateral moving platforms are stably supported on the ground.

[0024] As an option, between S2 and S3, a journal support frame is also installed between the journal of the rotor shaft of the engine casing and the engine casing to prevent the next stage rotor from separating from the casing.

[0025] Compared with the prior art, the tooling structure of the present invention is relatively simple, easy to process and convenient to operate. The method of replacing the first-stage blade in situ greatly improves the efficiency of engine failure repair, and meets the current repair requirements through actual tests and simulation verification. The in-situ replacement method and tooling of the present invention have good application prospects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a tooling for in-situ replacement of a first-stage fan rotor blade according to the present invention;

[0027] Figure 2 It is a schematic diagram of a blade lifter;

[0028] Figure 3 is a schematic diagram of installing the journal support frame;

[0029] Figure 4 is the cross-sectional view of the diversion cone;

[0030] In the figure, 1-installation vehicle body, 2-left and right transverse moving platform, 3-guide cone positioning rod, 4-bracket, 5-front and rear transverse moving platform, 6-operation panel, 7-support foot, 8-up and down lifting platform, 9-handle, 10-sliding block, 11-hook, 12-axle neck support frame. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, a tooling for replacing the rotor blades of a first-stage fan is designed, and the tooling includes an installation vehicle body 1, a motor, an electric push rod, a left and right lateral movement platform 2, a guide cone positioning rod 3, a bracket 4, a front and rear lateral movement platform 5, an operating panel 6, a support foot 7, an up and down lifting platform 8 and a blade lifter, wherein the blade lifter includes a handle 9, a sliding block 10 and a hook 11.

[0033] The installation vehicle body 1 is used as the main bearing structure of the tooling, and has rollers at its lower end for easy movement;

[0034] The upper and lower lifting platform 8 is fixed on the installation vehicle body 1 to realize the lifting and lowering along the height direction of the installation vehicle body 1 and the inclination adjustment of the upper and lower lifting platform 8. Specifically, the upper and lower lifting platform 8 is connected to the motor through four electric push rods, and the motor provides power for the electric push rods. The four electric push rods are distributed at the four vertex positions of the rectangle, in groups of two. When the four electric push rods produce the same elongation (contraction), the upper and lower lifting platform 8 realizes rising (descending). When the four electric push rods produce different elongations (contractions), the upper and lower lifting platform 8 realizes inclination adjustment. For example, if three of them have the same elongation and the other has a smaller elongation than the other three, the platform plane where the upper and lower lifting platform 8 is located is tilted toward the position of the electric push rod with the smaller elongation.

[0035] The left and right lateral movement platform 2 is arranged on the upper end surface of the upper and lower lifting platform 8 to realize translation along the length direction of the installation vehicle body 1. The lower end of the left and right lateral movement platform 2 is installed with a length-adjustable support rod. The left and right lateral movement platform is connected to the motor through an electric push rod, and the translation of the left and right lateral movement platform is realized by the action of the electric push rod driven by the motor;

[0036] The front and rear transverse moving platforms 5 are arranged on the upper end surfaces of the left and right transverse moving platforms 2 to realize translation along the width direction of the installation vehicle body 1. The front and rear transverse moving platforms are slidably connected to the upper end surfaces of the left and right transverse moving platforms through guide rails to realize the effect of manual fine-tuning of the position;

[0037] The bracket 4 is mounted on the front and rear transverse platforms 5. The bracket 4 has a support surface that is consistent with the outer surface of the front casing of the engine casing (the engine casing is composed of multiple casings, and the first-stage fan corresponds to the front casing) so that the front casing is tightly attached to the bracket 4. Figure 1The outer contour of the front casing is drawn in, and the support surface of the bracket 4 is consistent with the outer contour, that is, the support surface matches the size of the front casing, which is used to ensure stable placement during the disassembly process of the adapter engine casing;

[0038] The guide cone positioning rod 3 is installed on the left and right transverse platforms 2 through a bracket, and the guide cone positioning rod 3 extends to the top of the bracket 4 along the translation direction of the left and right transverse platforms 2. The guide cone positioning rod 3 is slidably connected to the bracket, and a locking structure, such as a clamping bolt, is designed on the bracket. One end of the clamping bolt is clamped on the surface of the guide cone positioning rod 3, so that the position of the guide cone positioning rod 3 on the bracket can be fixed. The guide cone positioning rod 3 is used to prevent the graphite and bearings from being damaged when the front casing is disassembled, and at the same time plays a role in guiding and positioning the movement of the front casing;

[0039] The operation panel 6 is mounted on the vehicle body 1 of the installation vehicle, and the operation panel 6 is electrically connected to the motor, so as to control the start and stop of the motor.

[0040] The length-adjustable support foot 7 is arranged at the lower end of the outer side of the mounting vehicle body 1;

[0041] The blade lifter includes a handle 9, a sliding block 10 and a hook 11. The handle 9 and the hook 11 are respectively located at the two ends of the same rod. The sliding block 10 is slidably connected to the rod between the handle 9 and the hook 11 through its through hole. In order to prevent the hook 11 from damaging the surface of the fan rotor blade, the surface of the hook 11 is sprayed with glue to avoid hard contact with the blade surface.

[0042] In-situ replacement of the first stage fan rotor blades consists of the following steps:

[0043] S1, push the installation vehicle body into the vicinity of the front casing of the engine casing, use a level and adjust the tooling by adjusting the length of the supporting feet and the inclination angle of the upper and lower lifting platforms, so that the upper and lower lifting platforms of the tooling are consistent with the level of the engine casing;

[0044] S2, move the left and right lateral platforms to the bottom of the front casing, manually translate the front and rear lateral platforms so that the bracket is directly under the front casing, raise the upper and lower lifting platforms upwards, and confirm again whether the bracket is aligned with the front casing. If not, manually translate the front and rear lateral platforms again. If aligned, continue to raise the upper and lower lifting platforms upwards until the bracket fits with the front casing, remove the engine fan inlet deflector cover, and install the deflector cone at the front end of the deflector cone positioning rod 3 (the deflector cone structure is as shown in FIG. Figure 4 As shown, its front end is a frustum, the rear end is a cylinder, and there is a through hole in the middle. The guide cone is installed in the following position: Figure 1The guide cone positioning rod 3 is shown at the leftmost end of the sliding guide cone positioning rod 3, the guide cone positioning rod 3 is slid until the guide cone at its front end is connected to the engine fan inlet guide, and then the left and right transverse platform 2 is moved in the opposite direction, so that the front casing and the first-stage fan rotor are separated from the engine casing as a whole. During the separation process, the front casing is translated under the guidance of the guide cone positioning rod 3; as an option, after moving the left and right transverse platforms to the bottom of the front casing, the length-adjustable support rods are adjusted as needed to ensure that the left and right transverse platforms are stably supported on the ground;

[0045] S3, the journal support frame 12 is installed between the journal of the rotor shaft of the engine casing and the engine casing to prevent the next stage rotor from separating from the casing, such as Figure 3 The journal support frame 12 is in the shape of a strip, one end of which is bent and fixed on the outer wall of the rear casing, and the other end is connected to the journal portion of the rotor shaft. The journal support frame 12 has at least one, Figure 3 Two journal support frames 12 are used.

[0046] S4, hook the hook 11 of the blade lifter onto the root of the blade, hold the handle 9 of the blade lifter at the same time, and then quickly move the sliding block 10 to hit the handle 9 (the sliding block 10 slides on the rod between the handle 9 and the hook 11, and uses the inertia of the sliding block 10 during the sliding process to impact the handle 9, and then pull the hook 11) to pull the blade out of the blade groove, replace the first-stage fan rotor blades one by one in situ, replace the first-stage fan rotor blades one by one in situ.

[0047] The in-situ blade replacement method of the present invention adopts Figure 1 After the front casing is disassembled by the tool shown, the inspection of the first-stage fan rotor blades and the replacement of damaged first-stage fan rotor blades can be completed. Figure 2 The dedicated blade lifter is completed.

[0048] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A tool for replacing the rotor blades of a first-stage fan in situ, characterized in that: include: A mounting vehicle body (1) with rollers at the lower end; An upper and lower lifting platform (8), wherein the upper and lower lifting platform (8) is fixed on the installation vehicle body (1) to achieve lifting along the height direction of the installation vehicle body (1) and adjustment of the inclination angle of the upper and lower lifting platform (8); A left-right lateral movement platform (2), wherein the left-right lateral movement platform (2) is arranged on the upper end surface of the upper and lower lifting platforms (8) to achieve translation along the length direction of the installation vehicle body (1), and a length-adjustable support rod is installed at the lower end of the left-right lateral movement platform (2); A front and rear transverse moving platform (5), wherein the front and rear transverse moving platform (5) is arranged on the upper end surface of the left and right transverse moving platforms (2) to achieve translation along the width direction of the installation vehicle body (1); A bracket (4), the bracket (4) being mounted on the front and rear transverse platforms (5), the bracket (4) having a support surface that is consistent with the outer profile of the front casing of the engine casing so that the front casing is tightly attached to the bracket (4); A guide cone positioning rod (3), wherein the guide cone positioning rod (3) is installed on the left and right transverse platforms (2) via a bracket, and the guide cone positioning rod (3) extends to the top of the bracket (4) along the translation direction of the left and right transverse platforms (2), and the guide cone positioning rod (3) is slidably connected to the bracket; A support foot (7) with adjustable length, the support foot (7) being arranged at the lower end of the outer side of the mounting vehicle body (1); A blade lifter comprises a handle (9), a sliding block (10) and a hook (11); the handle (9) and the hook (11) are respectively located at two ends of the same rod; the sliding block (10) is slidably connected to the rod between the handle (9) and the hook (11) through its through hole.

2. The tooling for in-situ replacement of a first-stage fan rotor blade according to claim 1, characterized in that: The upper and lower lifting platform (8) is connected to the motor via four electric push rods, and the motor drives the four electric push rods to complete different combined actions, thereby realizing the lifting and lowering and inclination adjustment of the upper and lower lifting platform (8).

3. The tooling for in-situ replacement of a first-stage fan rotor blade according to claim 1, characterized in that: The left and right transverse moving platform (2) is connected to the motor via an electric push rod, and the motor drives the electric push rod to achieve translation of the left and right transverse moving platform (2).

4. The tooling for in-situ replacement of a first-stage fan rotor blade according to claim 1, characterized in that: The front and rear transverse moving platforms (5) are slidably connected to the upper end surfaces of the left and right transverse moving platforms (2) via guide rails.

5. The tooling for in-situ replacement of a primary fan rotor blade according to claim 2 or 3, characterized in that: It also comprises an operating panel (6), wherein the operating panel (6) is mounted on the mounting vehicle body (1), and the operating panel (6) is electrically connected to the motor, thereby controlling the start and stop of the motor.

6. The tooling for in-situ replacement of a first-stage fan rotor blade according to claim 1, characterized in that: The length-adjustable support rod and support foot (7) comprise a lead screw.

7. A method for replacing a primary fan rotor blade in situ, characterized in that: The tooling according to claim 1 is used, and The following steps are involved: S1, pushing the installation vehicle body (1) into the vicinity of the front casing of the engine casing, using a level gauge and adjusting the length of the support legs (7) and the inclination angle of the upper and lower lifting platforms (8) to adjust the tooling so that the upper and lower lifting platforms (8) of the tooling are aligned with the level of the engine casing; S2, move the left and right transverse moving platforms (2) to the bottom of the front casing, manually translate the front and rear transverse moving platforms (5) so that the bracket (4) is located directly below the front casing, raise the upper and lower lifting platforms (8) upwards, and confirm again whether the bracket (4) is aligned with the front casing. If not, manually translate the front and rear transverse moving platforms (5) again. If aligned, continue to raise the upper and lower lifting platforms (8) upwards until the bracket (4) is in contact with the front casing, remove the engine fan inlet deflector cover, install the deflector cone at the front end of the deflector cone positioning rod (3), slide the deflector cone positioning rod (3) until the deflector cone at its front end is connected to the engine fan inlet deflector, and then reversely move the left and right transverse moving platforms (2) so that the front casing and the first-stage fan rotor are separated from the engine casing as a whole; S3, hook the hook (11) of the blade lifter onto the root of the blade, hold the handle (9) of the blade lifter at the same time, then quickly move the sliding block (10) to hit the handle (9) to pull the blade out of the blade groove, and replace the first-stage fan rotor blades one by one in situ.

8. The method for in-situ replacement of a primary fan rotor blade according to claim 7, characterized in that: In S2, after the left and right transverse moving platforms (2) are moved to the bottom of the front casing, the length-adjustable support rods are adjusted to ensure that the left and right transverse moving platforms (2) are stably supported on the ground.

9. The method for in-situ replacement of a primary fan rotor blade according to claim 7, characterized in that: The step between S2 and S3 also includes installing a journal support frame (12) between the journal of the rotor shaft of the engine casing and the engine casing to prevent the next-stage rotor from separating from the casing.

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