Tooling and method for checking the flexibility of engine rotor by simulating motor rotation

Abstract

The present invention discloses a tool and method for checking the flexibility of an engine rotor by simulating the rotation of an electric motor. The tool mainly includes a front part, a middle part, and a rear part. The front part includes a spline and a locating pin arranged on one side of a mounting seat and a spur gear 1 on the other side; the middle part includes a spur gear 2 meshing with the spur gear 1, and a bevel gear 1 fixed to one side of the spur gear 2; the rear part includes a bevel gear 2 meshing with the bevel gear 1 and a hand crank fixed to the rear of the bevel gear 2. The detection method includes: after the tool is installed, the engine rotor is driven to rotate at a low speed by turning the hand crank, and the flexibility of the rotor is checked by judging the rotation feel. The present invention can realize the function of checking the rotation flexibility of an axial compressor without disassembling the air inlet duct. It has a simple structure and is not easy to emit abnormal noise to affect the judgment. It can simply and effectively check the flexibility of the engine rotor, and the inspection results are stable and reliable.

Description

Technical Field

[0001] The present invention relates to the field of turboprop engines, and in particular to a tool and a method for simulating motor rotation to perform flexibility inspection on an engine rotor. Background Art

[0002] During the bench test of an aircraft turboprop engine, the axial compressor rotor must be checked for smooth rotation and no scratching after each shutdown. Currently, there are two common methods for checking the flexibility of the axial compressor rotor:

[0003] First, remove the front end of the compressor inlet and disconnect the starter motor, then manually rotate the first-stage blades of the axial compressor. The disadvantages of this solution are that it is complex and time-consuming to disassemble and reassemble. Frequent disassembly and assembly of the inlet can easily damage the sealing rubber ring at the joint, fostering the risk of excess material.

[0004] The disadvantages of using the starter motor to directly run the machine cold are high motor speed and loud noise, the test driver cannot detect the jamming in time in the control room through the intercom system, and the damage is likely to be expanded.

[0005] Invention application publication number CN117145595A discloses an aircraft engine blade rotation device. This device utilizes an external stepper motor. The stepper motor, mounted on a fixed frame, drives a coupling to rotate the worm gear within the gearbox. The worm shaft transmits torque to a spline shaft, which in turn transmits the rotation to a gear set within a central transmission. The gear transmission then drives the engine shaft, which in turn rotates the engine blades. While this patent effectively improves inspection efficiency, it still requires pre-positioning and installation, as well as motor commissioning, making the overall operation relatively complex. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a tool and method for simulating the rotation of an engine motor to check the flexibility of the engine rotor. Without removing the intake duct, the engine rotor can be controlled to rotate by the tool, which can simply and effectively check the flexibility of the engine rotor.

[0007] In one aspect of the present invention, a tool for simulating motor rotation to check the flexibility of an engine rotor is provided, comprising:

[0008] Tooling front, tooling middle, tooling tail;

[0009] The front portion of the tooling features a spline, a mounting seat, a first spur gear, and a locating pin. The mounting seat is equipped with a locating pin that mates with a mounting point on the engine for positioning. The spline and first spur gear are secured to opposite sides of the mounting seat via ball bearings, with the spline and locating pin coplanar. The middle portion of the tooling features a second spur gear and a first bevel gear. The second spur gear is welded to the bottom of the first bevel gear and meshes with the first spur gear at the front of the tooling. The rear portion of the tooling features a second bevel gear and a hand crank. The hand crank is welded to the bottom of the second bevel gear and meshes with the first bevel gear at the middle portion of the tooling.

[0010] Furthermore, the spline is subjected to anodizing surface treatment to increase the corrosion resistance of the spline and improve the service life of the tooling.

[0011] Furthermore, the spline connection is to the gear set inside the engine, and the rotation of the hand crank can be directly transmitted to the gear set inside the engine through the gear combination of the tooling, thereby realizing low-speed rotation of the axial compressor rotor.

[0012] Furthermore, the internal gear ratio of the tooling is the same as the actual gear ratio in the engine accessory gear set, so one rotation of the hand crank corresponds to one rotation of the axial compressor rotor, thereby controlling the rotor rotation rate from being too fast, ensuring that no abnormal scraping occurs between the engine blades and the guide vane, and at the same time simulating the real feel of hand-operating the compressor rotor.

[0013] Furthermore, the hand crank is subjected to anti-slip polishing treatment.

[0014] Furthermore, the positioning pin is a positioning piece that extends along the axial direction of the mounting seat and is plugged into and matched with the mounting hole on the engine.

[0015] Furthermore, a clamp fixing edge is provided on the mounting seat, and after the tooling is installed, the clamp is used to fix it circumferentially.

[0016] Another aspect of the present invention provides a method for checking the flexibility of an engine rotor by simulating motor rotation, comprising the following steps: without disassembling the axial compressor, aligning the locating pins, connecting the spline to the corresponding spline sleeve on the engine, and using a clamp for circumferential fixation. The transmission ratio of the tooling is the same as the actual transmission ratio in the engine accessory gear set. The spline drives the axial compressor rotor to rotate at a low speed by manually operating the hand crank. The operator's method of checking and determining the flexibility of the engine rotor using the tooling is consistent with the method of manually turning the axial blades.

[0017] Furthermore, the tooling is powered by manually rotating a crank handle, bevel gear one and bevel gear two are first-stage speed change, spur gear one and spur gear two are second-stage speed change, and the rotation amplitude of the crank handle can be controlled to control the axial compressor rotor to rotate to a free position.

[0018] Furthermore, the tooling changes the direction of the operator's hand movement from the engine axis to perpendicular to the engine axis through a combination of bevel gears, thereby increasing the movement space during operation.

[0019] The present invention has the following advantages:

[0020] 1. The tool is connected to the engine gear set through a spline and fixed with a clamp. This installation method is simple and can check the flexibility of the axial flow compressor rotor without disassembling the intake duct.

[0021] 2. The tool changes the direction of rotation through a combination of bevel gears, reducing the size of the tool and facilitating installation and inspection in narrow spaces.

[0022] 3. This tool simulates the same transmission ratio of the engine accessory gear set and the manual operation of the hand crank to drive the axial compressor rotor to rotate at low speed, thus avoiding the operational hidden danger of scraping the engine blades and guide vanes due to excessive motor speed when using the starting motor for disc rotor inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the engine gear transmission combination.

[0024] Figure 2 This is a schematic diagram of the tooling structure.

[0025] Figure 3 This is a diagram of the position of the tooling installed on the engine.

[0026] Figure 4 This is a diagram of the installation interface and quick-release clamp.

[0027] In the figure: 1 spline, 2 mounting seat, 3 spur gear 1, 4 positioning pin, 5 spur gear 2, 6 bevel gear 1, 7 bevel gear 2, 8 hand crank. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the solutions of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive overview of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification are only for describing specific embodiments and are not intended to limit the present application.

[0032] Example 1

[0033] like Figure 2 In this embodiment, a tooling is provided for simulating the rotation of a motor to check the flexibility of an engine rotor, including: a spline 1, a mounting seat 2, a spur gear 3, a locating pin 4, a spur gear 5, a bevel gear 1 6, a bevel gear 2 7, and a hand crank 8.

[0034] Furthermore, the spline is a 12-tooth spline, the spur gear 1 3 is a 17-tooth spur gear, the spur gear 2 5 is a 34-tooth spur gear, the bevel gear 1 6 is an 18-tooth bevel gear, and the bevel gear 2 7 is a 45-tooth bevel gear.

[0035] Furthermore, a locating pin 4 is provided on the surface of the mounting seat 2, and the locating pin 4 can cooperate with the mounting part on the engine for positioning. The spline 1 and the spur gear 3 are respectively fixed on the two sides of the mounting seat 2 through ball bearings, and the spline 1 and the locating pin 4 are in the same plane.

[0036] Furthermore, spur gear 1 3 meshes with spur gear 2 5, and bevel gear 1 6 meshes with bevel gear 2 7. Spur gear 2 5 is connected to the bottom of bevel gear 1 6 by welding, and hand crank 8 is connected to the bottom of bevel gear 2 7 by welding.

[0037] like Figures 1 to 4 The spline 1 is subjected to anodizing surface treatment to increase corrosion resistance and improve the service life of the tooling.

[0038] Furthermore, the spline 1 is connected to the gear set inside the engine, and the rotation of the hand crank 8 can be directly transmitted to the gear set inside the engine through the gear combination of the tooling, thereby realizing low-speed rotation of the axial compressor rotor.

[0039] Furthermore, the gear ratio inside the tooling is the same as the gear ratio inside the engine accessory gear set, and one rotation of the hand crank 8 corresponds to one rotation of the axial compressor rotor.

[0040] Furthermore, the hand crank 8 is subjected to anti-slip polishing treatment.

[0041] Furthermore, the positioning pin 4 is a positioning part extending along the axial direction of the mounting seat 2 and plugging into the mounting hole on the engine. The shapes of the positioning pin 4 may be different in different embodiments, but the functions are the same, and they are all used for positioning during tooling installation.

[0042] Furthermore, a clamp fixing edge is provided on the mounting seat 2, and after the tooling is installed, the clamp is used to fix it circumferentially.

[0043] Example 2

[0044] The implementation method of Example 2 is generally consistent with that of Example 1, and can achieve the same technical effect as Example 1, except that: for different models of aircraft engines, the transmission ratio of the tooling gear set and the transmission ratio of the engine compressor rotor to the starter motor gear need to be designed to be the same.

[0045] Furthermore, in different embodiments, the shape of the spline 1 may be different, but the functions are the same. The design of the spline 1 matches the internal gear set of the aircraft accessory casing to realize the rotation of the engine rotor.

[0046] Example 3

[0047] Based on the various embodiments of the tooling for checking the flexibility of the engine rotor by simulating the rotation of the motor, this embodiment also provides corresponding inspection method embodiments. After the engine stops, remove the starting motor. Without disassembling the axial compressor, connect the spline 1 of the tooling to the corresponding spline sleeve on the engine, and align the locating pin 4 at the same time, and use a fixing clamp to fix the tooling circumferentially. The transmission ratio of the tooling is the same as the actual transmission ratio in the engine accessory gear set. One rotation of the hand crank 8 corresponds to one rotation of the axial compressor rotor. By manually operating the hand crank 8, the spline 1 drives the axial compressor rotor to rotate at a low speed. The operator's method of checking and judging the flexibility of the engine rotor using the tooling is consistent with the method of manually turning the axial blades.

[0048] Furthermore, the tooling is powered by manually rotating the crank handle 8, bevel gear 1 6 and bevel gear 2 7 are the first stage of speed change, spur gear 1 3 and spur gear 2 5 are the second stage of speed change, and the rotation amplitude of the crank handle 8 can be controlled to control the axial compressor rotor to rotate to a free position.

[0049] Furthermore, the tooling changes the direction of the operator's hand movement from the engine axis to perpendicular to the engine axis through a combination of bevel gears, thereby increasing the movement space during operation.

[0050] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0051] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A tool for checking the flexibility of an engine rotor by simulating the rotation of a motor, characterized in that: Including the front part, middle part and tail part of tooling; The front part of the tooling comprises a spline (1), a mounting seat (2), a spur gear (3), and a positioning pin (4); the spline (1) and the spur gear (3) are respectively connected to two sides of the mounting seat (2); the positioning pin (4) and the spline (1) are on the same side; The middle part of the tooling includes a spur gear 2 (5) and a bevel gear 1 (6), wherein the spur gear 2 (5) is connected to the bottom of the bevel gear 1 (6), and the spur gear 2 (5) is meshed with the spur gear 1 (3) at the front part of the tooling; The tail portion of the tooling includes a second bevel gear (7) and a hand crank (8), wherein the hand crank (8) is fixed to the bottom of the second bevel gear (7), and the second bevel gear (7) is meshed with the first bevel gear (6) in the middle portion of the tooling; the tooling is connected to the internal gear set of the engine through a spline (1), and the rotation of the hand crank (8) is transmitted to the internal gear set of the engine through the gear combination of the tooling, thereby realizing low-speed rotation of the axial compressor rotor.

2. The tool for checking the flexibility of an engine rotor by simulating the rotation of a motor according to claim 1, characterized in that: The spline (1) is subjected to anodizing surface treatment.

3. The tool for checking the flexibility of an engine rotor by simulating the rotation of a motor according to claim 1, characterized in that: The gear set transmission ratio of the tooling is the same as the transmission ratio of the engine compressor rotor to the starter motor gear.

4. The tool for checking the flexibility of an engine rotor by simulating the rotation of a motor according to claim 1, characterized in that: The surface of the hand crank (8) is subjected to anti-skid polishing treatment.

5. The tool for checking the flexibility of an engine rotor by simulating the rotation of a motor according to claim 1, characterized in that: The positioning pin (4) is a positioning piece that extends along the axial direction of the mounting seat (2) and is plugged into and matched with the mounting hole on the engine.

6. The tool for checking the flexibility of an engine rotor by simulating the rotation of a motor according to claim 1, characterized in that: After the tooling is installed, the mounting seat (2) and the mounting surface of the engine are fixed circumferentially using a clamp.

7. A method for checking the flexibility of an engine rotor based on the tool for checking the flexibility of an engine rotor by simulating the rotation of a motor as described in claims 1 to 6, characterized in that: The method comprises the following steps: without disassembling the axial flow compressor, aligning the positioning pin to connect the spline (1) to the corresponding spline sleeve on the engine, and using a clamp to fix it circumferentially; the transmission ratio of the tool is the same as the actual transmission ratio in the engine accessory gear set; manually operating the hand crank (8) to make the spline (1) drive the axial flow compressor rotor to rotate at a low speed; the operator's inspection and judgment method for the flexibility of the engine rotor using the tool is consistent with the inspection and judgment method for manually turning the axial flow blades.

8. The method for checking the flexibility of an engine rotor according to claim 7, characterized in that: The tooling is powered by manually rotating a crank handle (8), bevel gear 1 (6) and bevel gear 2 (7) are the first stage of speed change, spur gear 1 (3) and spur gear 2 (5) are the second stage of speed change, and the axial flow compressor rotor is rotated to a free position.

9. The method for checking the flexibility of an engine rotor according to claim 7, characterized in that: By combining bevel gear 1 (6) and bevel gear 2 (7), the direction of movement of the operator's hand is changed from the engine axis to perpendicular to the engine axis.

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