A rotor blade outer diameter measuring device and method

Abstract

The present application relates to a kind of rotor blade outer diameter measuring device and method, including low pressure rotor assembly car, low pressure rotor is fixed on low pressure rotor assembly car;Low pressure rotor assembly car includes for rotor fixed support, fixed shaft is provided on the rotor fixed support, the end of fixed shaft is provided with limit mechanism, and low pressure rotor is fixed by rotor plug and limit mechanism;Measuring device further includes probe fixed support, erects on low pressure rotor, and both ends are fixed on the reference on the both sides of low pressure rotor;Probe fixed support is provided with sliding rod along the axial direction of low pressure rotor, and multiple probe mounting seats are slidably connected on sliding rod;Probe mounting seat is equipped with measuring probe according to technical requirement on it, and measuring probe measuring end is in contact with the surface of low pressure rotor blade, and measuring probe is electrically connected with electrical control cabinet.The present application can directly receive test result and output according to the data required by technical requirement, it is efficient, stable, greatly improve the efficiency and stability of test.

Description

Technical Field

[0001] This invention belongs to the technical field of outer diameter measuring devices, and particularly relates to a rotor blade outer diameter measuring device and method. Background Technology

[0002] The rotor of a gas turbine engine is a crucial component. During the production and maintenance of gas turbine engine rotors, it is necessary to measure the maximum outer diameter of each stage of rotor blades to ensure that the outer diameter of the rotor blades is within the required dimensional range. Current rotor blade measurement methods have many shortcomings. The most mainstream method involves using standard samples with specialized tooling and a dial indicator. However, this method suffers from low measurement efficiency and poor measurement stability. Therefore, there is an urgent need to improve existing rotor measurement technology to address these issues. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a rotor blade outer diameter measuring device and method. This device is an automatic rotor measuring device that uses a measuring probe to measure the outer diameter of rotor blades. It is also equipped with an electrical control cabinet 1. Through its own acquisition and processing system, it can directly receive test results and output the data required by technical requirements. It is efficient and stable, greatly improving the efficiency and stability of testing.

[0004] A rotor blade outer diameter measuring device includes a low-pressure rotor assembly cart, on which the low-pressure rotor is fixed and can rotate around its central axis. The low-pressure rotor assembly cart includes a rotor fixing bracket for fixing the low-pressure rotor, and a fixing shaft for fixing the low-pressure rotor is provided on the rotor fixing bracket. A limit mechanism is provided at the end of the fixing shaft. The low-pressure rotor is fixed on the fixing shaft and is fixed to the limit mechanism by a rotor plug, thereby achieving axial fixation of the low-pressure rotor. The measuring device also includes a probe fixing bracket, which is mounted on the low-pressure rotor and its two ends are fixed to references on both sides of the low-pressure rotor. A sliding rod is provided on the probe fixing bracket along the axial direction of the low-pressure rotor, and multiple probe mounting seats are slidably connected to the sliding rod. A measuring probe is installed on the probe mounting seat according to technical requirements. The measuring end of the measuring probe contacts the surface of the low-pressure rotor blade, and the measuring probe is electrically connected to an electrical control cabinet.

[0005] The limiting mechanism includes a positioning plate, a limiting protrusion, and bolts. The positioning plate is fixed on a fixed shaft. The limiting protrusion has an L-shaped cross-section and is inverted on the positioning plate. It is arranged around the circumference of the positioning plate by bolts. One end of the rotor plug is snapped between the limiting protrusion and the positioning plate, and the other end is connected to one end of the low-pressure rotor by bolts.

[0006] The probe mounting base is configured according to technical requirements.

[0007] The number of probe mounting bases is four.

[0008] The probe mounting base is provided with bolts in the direction perpendicular to the sliding rod. The position of the probe mounting base on the sliding rod is fixed and locked by the bolts. The bolts on the sliding rod are machined with a flat surface relative to the probe mounting base. When the bolts are screwed in and press against the flat surface, the position of the probe mounting base is fixed.

[0009] The measuring probe is an inductive probe, and the measuring end of the inductive probe is a spherical probe to avoid interference between the blade tip of the low-pressure rotor and the measuring end of the measuring probe during the measurement process.

[0010] The method of using the above-mentioned rotor blade outer diameter measuring device includes the following steps:

[0011] Step 1: Open the electrical control cabinet;

[0012] Step 2: Install the low-pressure rotor to be tested on the rotor mounting bracket, and at the same time use the limiting mechanism to ensure that the rotor is in the installation position on the rotor mounting bracket;

[0013] Step 3: Adjust the position of the measuring probe mounting base on the sliding rod so that the measuring probe is aligned with the rotor blade outer diameter measurement position required by the technical requirements, and fix it with bolts;

[0014] Step 4: Adjust the electrical control cabinet to a test state where information can be collected;

[0015] Step 5: Manually rotate the low-pressure rotor so that it rotates on the rotor mounting bracket. One rotation ensures that each blade of the same stage passes through the measuring probe to obtain the outer diameter of each rotor blade.

[0016] Step 6: Stop data acquisition and shut down the electrical control cabinet.

[0017] The beneficial effects of this invention are:

[0018] This invention allows for the measurement of all rotor blades in one revolution of the low-pressure rotor. Simultaneously, a single person can quickly complete the entire process of measuring and recording the outer diameter of multi-stage rotor blades, thereby improving the efficiency of rotor blade outer diameter measurement in gas turbine engines and reducing the labor costs associated with rotor blade measurement.

[0019] This invention can avoid measurement errors caused by different operators. At the same time, the measurement results of multiple measurements on the same rotor are highly consistent, ensuring the consistency of multiple measurement results of the same workpiece and improving the stability of the outer diameter measurement of the rotor blades of gas turbine engines.

[0020] This invention enables the measurement of the outer diameter of workpieces of the same station, same specifications, but different groups during the production process of gas turbine engine rotors.

[0021] This measuring device has been successfully used to measure the outer diameter of the compressor rotor blades of a certain type of gas turbine engine. It has the potential to be applied to the outer diameter measurement of rotor blades of all gas turbine engines, and the application market is huge. Attached Figure Description

[0022] Figure 1 A schematic diagram of the connection structure of the measuring device provided by the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0024] Figure 3 This is a schematic diagram of the installation structure of the measuring probe in this invention;

[0025] Figure 4 for Figure 3 CC view in the middle;

[0026] Figure 5 for Figure 3 The view from C1 to C1;

[0027] Figure 6 for Figure 3 The C2-C2 view;

[0028] Figure 7 for Figure 3 The C3-C3 view;

[0029] Figure 8 This is the electrical circuit diagram of the present invention;

[0030] Figure 9 This is a schematic diagram of the spherical probe at the measuring end of the measuring probe in this invention;

[0031] in,

[0032] 1-Electrical control cabinet, 2-Probe mounting bracket, 3-Measuring probe, 4-Probe mounting base, 5-Sliding rod, 6-Limiting mechanism, 61-Positioning plate, 62-Limiting protrusion, 63-Rotor plug, 7-Rotor mounting bracket, 8-Rotating handle, 9-Low-pressure rotor. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the technical solution and effects of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1As shown, a rotor blade outer diameter measuring device includes a low-pressure rotor 9 assembly carriage. The low-pressure rotor 9 is fixed on the assembly carriage and can rotate around a central axis. The assembly carriage includes a rotor fixing bracket 7 for fixing the low-pressure rotor 9. A fixing shaft for fixing the low-pressure rotor 9 is provided on the rotor fixing bracket 7. A limiting mechanism 6 is provided at the end of the fixing shaft. The low-pressure rotor 9 is fixed on the fixing shaft and fixed to the limiting mechanism 6 by a rotor plug 63, thereby achieving axial fixation of the low-pressure rotor 9. The limiting mechanism 6 ensures that the low-pressure rotor 9 can be fixed relative to the fixing shaft in the axial direction, while it can rotate freely in the circumferential direction, and ensures that the rotor is installed in the same position each time. A rotating handle 8 is connected to the end of the fixing shaft on the rotor fixing bracket 7.

[0035] like Figure 2 As shown, the limiting mechanism 6 includes a positioning plate 61, a limiting protrusion 62, and bolts. The positioning plate 61 is fixed on a fixed shaft. The limiting protrusion 62 has an L-shaped cross-section and is upside down on the positioning plate 61. It is arranged around the positioning plate 61 by bolts. One end of the rotor plug 63 is snapped between the limiting protrusion 62 and the positioning plate 61, and the other end is connected to one end of the low-pressure rotor 9 by bolts.

[0036] The measuring device also includes a probe fixing bracket 2, which is mounted on the low-pressure rotor 9. Both ends of the probe fixing bracket 2 are fixed to the reference on both sides of the low-pressure rotor 9. A sliding rod 5 is provided on the probe fixing bracket 2 along the axial direction of the low-pressure rotor 9. Multiple probe mounting seats 4 are slidably connected to the sliding rod 5. The probe mounting seats 4 are set according to technical requirements. In this embodiment, the number of probe mounting seats 4 is four.

[0037] A bolt is provided on the probe mounting base 4 in a direction perpendicular to the sliding rod 5. The bolt fixes and locks the position of the probe mounting base 4 on the sliding rod 5. A flat surface is machined on the sliding rod 5 relative to the bolt on the probe mounting base 4. When the bolt is screwed in and presses against the flat surface, the position of the probe mounting base 4 is fixed, preventing the position of the probe mounting base 4 from moving during the measurement process and affecting the measurement results.

[0038] like Figure 2-7 As shown, a measuring probe 3 is installed on the probe mounting base 4 according to technical requirements. The measuring end of the measuring probe 3 contacts the surface of the blades of the low-pressure rotor 9. The measuring probe 3 is electrically connected to the electrical control cabinet 1. The automatic data acquisition and processing system built into the electrical control cabinet 1 collects the displacement change information on the measuring probe 3 via a wired connection. This embodiment uses an Advantech industrial computer, and the electrical wiring diagram is shown below. Figure 8As shown. In this embodiment, the probe mounting base 4 is equipped with two measuring probes 3, for a total of eight measuring probes 3, respectively labeled as first-level front probe, first-level rear probe, second-level front probe, second-level rear probe, third-level front probe, third-level rear probe, fourth-level front probe, and fourth-level rear probe. Each probe mounting base 4 has a through hole, into which the measuring probe 3 is inserted and secured with bolts. By contacting the rotor blades with the measuring probe 3, it can extend and retract as the radial dimension of the rotor blades changes, thereby measuring the blade dimensions. If the rotor has multiple levels of blades, multiple measuring probes 3 can be installed to complete the measurement simultaneously. This invention achieves multi-channel data acquisition of the rotor outer diameter dimension through the electrical control cabinet 1. After acquisition, the user can perform corresponding processing according to actual needs, such as obtaining the maximum, minimum, and arithmetic mean of the rotor blade outer diameter, and finally achieve electronic and paper output of the data through the electrical control cabinet 1.

[0039] like Figure 9 As shown, the measuring probe 3 is an inductive probe, and the measuring end of the inductive probe is a spherical probe. It can be modified from an existing inductive probe by replacing the original measuring end with a spherical probe. The measuring end face of the spherical probe has an elliptical structure to avoid interference between the blade tip of the low-pressure rotor 9 and the measuring end of the measuring probe 3 during the rotation of the probe.

[0040] A method of using a rotor blade outer diameter measuring device includes the following steps:

[0041] Step 1: Open electrical control cabinet 1 and put it into standby mode.

[0042] Step 2: Install the low-pressure rotor 9 to be tested on the rotor fixing bracket 7, and at the same time, ensure the rotor is in the installation position of the rotor fixing bracket 7 by the limiting mechanism 6.

[0043] Step 3: Adjust the position of the measuring probe 3 mounting base on the sliding rod 5 so that the measuring probe 3 is aligned with the rotor blade outer diameter measurement position required by the technical requirements, and fix it with bolts.

[0044] Step 4: Adjust the electrical control cabinet 1 to the test state where information can be collected.

[0045] Step 5: Manually rotate the low-pressure rotor 9 so that it rotates on the rotor fixing bracket 7. Rotate one revolution so that each blade of the same stage passes through the measuring probe 3 to obtain the outer diameter of each rotor blade.

[0046] Step 6: Stop collecting data, output data as required by technical requirements, and shut down electrical control cabinet 1.

Claims

1. A rotor blade outer diameter measuring device, characterized in that: The system includes a low-pressure rotor assembly cart on which the low-pressure rotor is fixed and can rotate around its central axis. The low-pressure rotor assembly cart includes a rotor mounting bracket for fixing the low-pressure rotor. A fixing shaft for fixing the low-pressure rotor is provided on the rotor mounting bracket, and a limit mechanism is provided at the end of the fixing shaft. The low-pressure rotor is fixed to the fixing shaft and secured to the limit mechanism by a rotor plug, achieving axial fixation of the low-pressure rotor. The measuring device also includes a probe mounting bracket mounted on the low-pressure rotor, with both ends fixed to reference points on both sides of the low-pressure rotor. A sliding rod is provided on the probe mounting bracket along the axial direction of the low-pressure rotor, and multiple probe mounting seats are slidably connected to the sliding rod. Measuring probes are installed on the probe mounting seats according to technical requirements. The measuring ends of the measuring probes contact the surface of the low-pressure rotor blades. As the low-pressure rotor rotates on the rotor mounting bracket, each blade of the same stage passes through the measuring probe in one revolution, obtaining the outer diameter dimension of each rotor blade. The measuring probes are electrically connected to the electrical control cabinet. The measuring probe is an inductive probe, and the measuring end of the inductive probe is a spherical probe. The measuring end face of the spherical probe has an elliptical structure to avoid interference between the blade tip of the low-pressure rotor and the measuring end of the measuring probe during measurement.

2. The rotor blade outer diameter measuring device according to claim 1, characterized in that: The limiting mechanism includes a positioning plate, a limiting protrusion, and bolts. The positioning plate is fixed on a fixed shaft. The limiting protrusion has an L-shaped cross-section and is inverted on the positioning plate. It is arranged around the circumference of the positioning plate by bolts. One end of the rotor plug is snapped between the limiting protrusion and the positioning plate, and the other end is connected to one end of the low-pressure rotor by bolts.

3. The rotor blade outer diameter measuring device according to claim 1, characterized in that: The probe mounting base is configured according to technical requirements.

4. The rotor blade outer diameter measuring device according to claim 3, characterized in that: The number of probe mounting bases is four.

5. The rotor blade outer diameter measuring device according to claim 1, characterized in that: The probe mounting base is provided with bolts in the direction perpendicular to the sliding rod. The position of the probe mounting base on the sliding rod is fixed and locked by the bolts. The bolts on the sliding rod are machined with a flat surface relative to the probe mounting base. When the bolts are screwed in and press against the flat surface, the position of the probe mounting base is fixed.

6. The method of using the rotor blade outer diameter measuring device according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Open the electrical control cabinet; Step 2: Install the low-pressure rotor to be tested on the rotor mounting bracket, and at the same time use the limiting mechanism to ensure that the rotor is in the installation position on the rotor mounting bracket; Step 3: Adjust the position of the measuring probe mounting base on the sliding rod so that the measuring probe is aligned with the rotor blade outer diameter measurement position required by the technical requirements, and fix it with bolts; Step 4: Adjust the electrical control cabinet to a test state where information can be collected; Step 5: Manually rotate the low-pressure rotor so that it rotates on the rotor mounting bracket. One rotation ensures that each blade of the same stage passes through the measuring probe to obtain the outer diameter of each rotor blade. Step 6: Stop data acquisition and shut down the electrical control cabinet.

Images