Device and method for measuring space size of ring part of aero-engine

Abstract

The invention relates to the technical field of aero-engine measurement, in particular to an aero-engine annular part class space size measuring device and method. The measuring device comprises a cross beam, two positioning pins and a stop pin. Supporting plates are integrally formed on the two sides of the first end of the cross beam respectively, and the two supporting plates and the cross beam jointly form a T-shaped beam structure. The two positioning pins are installed at the positions, close to the ends, of the two supporting plates correspondingly. The stop pin is mounted on the cross beam; a dial indicator mounting hole is formed in the head of the first end of the cross beam, and a dial indicator is mounted in the dial indicator mounting hole; the dial indicator mounting hole and the stop pin are located on the perpendicular bisector of the connecting line of the two positioning pins. By adopting the measuring device and the measuring method, the problems that the size from the upper surface of the aero-engine low-pressure turbine rear baffle margin plate to the lower surface of the part opening edge is difficult to measure, the measurement is inaccurate, and the measuring efficiency is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine measurement, and in particular to a device and method for measuring the spatial dimensions of an annular component of an aero-engine. Background Art

[0002] There are a lot of ring-shaped parts in aircraft engines, and many of the spatial dimensions of these parts cannot be measured manually. The most commonly used measurement method is three-coordinate measurement, but there are still many types of spatial dimensions that cannot be accurately measured by three-coordinates, such as sharp edge dimensions, dimensions from a point on a curved surface to a plane, etc.

[0003] Combination Figure 1 As shown, the measured part 100 is a rear baffle of a low-pressure turbine of an aircraft engine, and an edge plate 101 is arranged on its outer peripheral surface. The upper surface of the edge plate 101 is a curved surface structure, and the dimension to be measured is the height from the upper surface of the edge plate 101 to the lower surface of the mouth edge of the measured part 100. Since the upper surface of the edge plate 101 to be measured and the lower surface of the mouth edge of the measured part 100 are not in the same cavity, the measurement is difficult. Summary of the invention

[0004] The main purpose of the present invention is to provide a device and method for measuring the spatial dimensions of annular parts of an aircraft engine, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned objectives, on the one hand, the present invention proposes a spatial dimension measuring device for annular parts of an aircraft engine, comprising a crossbeam, two positioning pins and a stop pin; support plates are integrally formed on both sides of the first end of the crossbeam, and the two support plates and the crossbeam together constitute a T-beam structure; the two positioning pins are respectively installed at positions of the two support plates close to the ends; the stop pin is installed on the crossbeam; a dial indicator mounting hole is provided at the head of the first end of the crossbeam, and a dial indicator is installed in the dial indicator mounting hole; the dial indicator mounting hole and the stop pin are both located on the perpendicular midline of the line connecting the two positioning pins.

[0006] Preferably, a waist-shaped hole is provided at the first end of the crossbeam; the waist-shaped hole is located on the perpendicular bisector of the line connecting the two positioning pins, and the long direction of the waist-shaped hole is parallel to the perpendicular bisector of the line connecting the two positioning pins; the stepped shaft structure of the stop pin decreases in diameter from bottom to top, and comprises an axial limit section, a positioning section, a sliding fit section and a threaded section in sequence; the sliding fit section of the stop pin is inserted in the waist-shaped hole, and the threaded section of the stop pin extends out from the waist-shaped hole and is screwed with a knurled nut; the outer peripheral surface of the positioning section is used to abut against the inner hole of the edge of the mouth of the measured part; the axial limit section is used to clamp on the lower surface of the edge of the mouth of the measured part.

[0007] Preferably, a fixing block is installed on the lower surface of the second end of the beam, and the fixing block is used to clamp on the lower surface of the edge of the mouth of the part to be measured; a first knurled flat head screw is screwed on the first end of the beam, and a third knurled flat head screw is screwed on the second end of the beam; the lower ends of the first knurled flat head screw and the third knurled flat head screw are used to tighten against the top surface of the edge of the mouth of the part to be measured, respectively.

[0008] Preferably, the locating pin is mounted on the support plate via a hexagonal nut and a flat washer.

[0009] Preferably, a screw section is provided at the top of the locating pin; a locating pin mounting hole is provided on the support plate, and the locating pin mounting hole is a stepped hole which is larger at the bottom and smaller at the top; the step of the locating pin abuts against the step surface of the locating pin mounting hole, and the flat washer and the hexagonal nut are installed on the screw section at the top of the locating pin.

[0010] Preferably, a bushing is embedded in the dial indicator mounting hole.

[0011] Preferably, a second knurled flat head screw is screwed onto the end surface of the head portion of the first end of the cross beam; the second knurled flat head screw is tightened against the bushing to fix the dial indicator.

[0012] Preferably, a plurality of lightening holes are provided on the crossbeam.

[0013] On the other hand, the present invention also provides a method for measuring the spatial dimensions of an aero-engine annular component. The measuring device comprises the following steps:

[0014] S1. Place the measuring device on the top surface of the mouth of the part to be measured;

[0015] S2. Adjust the position of the measuring device so that the outer cylindrical surfaces of the lower ends of the positioning pins on the two support plates respectively abut against the outer cylindrical surfaces of the mouth of the measured part; at the same time, the fixed block is clamped on the lower surface of the edge of the mouth of the measured part;

[0016] S3, adjust the position of the stop pin on the waist groove so that the outer peripheral surface of the positioning section of the stop pin abuts against the inner hole of the edge of the mouth of the measured part, and the axial limit section of the stop pin is stuck on the lower surface of the edge of the mouth of the measured part, and tighten the knurled nut;

[0017] S4, tighten the first knurled flat head screw and the third knurled flat head screw to fix the entire measuring device on the measured part;

[0018] S5. Install a dial indicator on the dial indicator installation hole at the first end of the beam, and use the probe of the dial indicator to measure the upper surface of the edge plate of the measured part.

[0019] Preferably, in step S5, the vertical distance from the center of the stop pin to the line connecting the two positioning pins is measured.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0021] (1) By adopting the measuring device and the measuring method provided by the present invention, during measurement, the measuring device is installed on the top surface of the mouth of the rear baffle of the low-pressure turbine of the aircraft engine, and the positioning is completed using two positioning pins and one stop pin. The height from the upper surface of the edge plate of the measured part to the lower surface of the mouth edge of the measured part can be indirectly measured using a dial indicator.

[0022] (2) By adopting the measuring device and the measuring method provided by the present invention, the problems of difficult measurement, inaccurate measurement and low measurement efficiency of the dimension from the upper surface of the rear baffle edge plate of the low-pressure turbine of an aircraft engine to the lower surface of the part mouth edge are overcome, and the measurement accuracy can be improved while also greatly improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A front view of the measuring device provided by the present invention cooperating with the measured part;

[0025] Figure 2 A top view of the measuring device provided by the present invention in cooperation with the measured part;

[0026] Figure 3 It is a schematic diagram of the connection between the positioning pin and the support plate in this method.

[0027] Explanation of the accompanying drawings: 1. Crossbeam; 1a. Support plate; 1b. Waist-shaped hole; 1c. Lightening hole; 1d. Dial indicator mounting hole; 2. Stop pin; 2a. Sliding fit section; 2b. Positioning section; 2c. Axial limit section; 3. Positioning pin; 4. First knurled flat head screw; 5. Nameplate; 6. Fixing block; 7. Slotted cylindrical head screw; 8. Hexagon socket cylindrical head screw; 9. Knurled nut; 10. Second knurled flat head screw; 11. Third knurled flat head screw; 12. Hexagonal nut; 13. Cylindrical pin; 14. Flat washer; 15. Bushing; 100. Part to be measured; 101. Edge plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The part 100 under test is a rear baffle of a low-pressure turbine of an aircraft engine, and an edge plate 101 is arranged on its outer peripheral surface. The upper surface of the edge plate 101 is a curved structure. The dimension to be measured is the height from the upper surface of the edge plate 101 to the lower surface of the mouth edge of the part 100 under test.

[0032] Combination Figure 1 , Figure 2 As shown, on the one hand, this embodiment provides a spatial dimension measuring device for annular parts of an aircraft engine, comprising a crossbeam 1, two locating pins 3 and a stop pin 2; support plates 1a are integrally formed on both sides of the first end of the crossbeam 1, and the two support plates 1a and the crossbeam 1 together constitute a T-beam structure; the two locating pins 3 are respectively installed at positions close to the ends of the two support plates 1a; the stop pin 2 is installed on the crossbeam 1; a dial indicator mounting hole 1d is provided at the head of the first end of the crossbeam 1, and a dial indicator is installed in the dial indicator mounting hole 1d; the dial indicator mounting hole 1d and the stop pin 2 are both located on the perpendicular midline of the line connecting the two locating pins 3.

[0033] Furthermore, a waist-shaped hole 1b is provided at the first end of the crossbeam 1; the waist-shaped hole 1b is located on the midline of the line connecting the two positioning pins 3, and the long direction of the waist-shaped hole 1b is parallel to the midline of the line connecting the two positioning pins 3; the stop pin 2 has a stepped shaft structure, and its diameter decreases from bottom to top, and comprises an axial limiting section 2c, a positioning section 2b, a sliding fitting section 2a and a threaded section in sequence; the sliding fitting section 2a of the stop pin 2 is inserted into the waist-shaped hole 1b, and the threaded section of the stop pin 2 extends out from the waist-shaped hole 1b and is screwed with a knurled nut 9; the outer peripheral surface of the positioning section 2b is used to abut against the inner hole of the mouth edge of the measured part 100; the axial limiting section 2c is used to clamp on the lower surface of the mouth edge of the measured part 100.

[0034] In this embodiment, a fixing block 6 is installed on the lower surface of the second end of the crossbeam 1; the fixing block 6 is fixedly installed on the crossbeam 1 by means of a hexagon socket head screw 8 and a cylindrical pin 13. A first knurled flat head screw 4 is screwed on the first end of the crossbeam 1, and a third knurled flat head screw 11 is screwed on the second end of the crossbeam 1. By using the fixing block 6 to clamp on the lower surface of the mouth edge of the measured part 100, and using the lower end of the third knurled flat head screw 11 to press against the top surface of the mouth edge of the measured part 100, the second end of the crossbeam 1 can be fixed on the measured part 100. By using the axial limiting section 2c of the stop pin 2 to clamp on the lower surface of the mouth edge of the measured part 100, and using the lower end of the first knurled flat head screw 4 to press against the top surface of the mouth edge of the measured part 100, the first end of the crossbeam 1 can be fixed on the measured part 100.

[0035] Combination Figure 1 , Figure 3 As shown, the positioning pin 3 is installed on the support plate 1a through the hexagonal nut 12 and the flat washer 14. Specifically, a screw section is provided on the top of the positioning pin 3; a positioning pin mounting hole is provided on the support plate 1a, and the positioning pin mounting hole is a stepped hole with a larger bottom and a smaller top; the step of the positioning pin 3 abuts against the step surface of the positioning pin mounting hole, and the flat washer 14 and the hexagonal nut 12 are installed on the screw section at the top of the positioning pin 3.

[0036] Combination Figure 1 As shown, a bushing 15 is embedded in the dial indicator mounting hole 1d. Further, a second knurled flat head screw 10 is screwed on the end surface of the head of the first end of the beam 1; the second knurled flat head screw 10 is pressed against the bushing 15 to fix the dial indicator.

[0037] Combination Figure 2 As shown, a plurality of lightening holes 1c are provided on the crossbeam 1 to reduce the weight of the entire measuring device so as to facilitate workers to perform measuring operations.

[0038] A nameplate 5 is mounted on the crossbeam 1, and the nameplate 5 is fastened to the crossbeam 1 by a slotted cylindrical head screw 7. The nameplate 5 is engraved with relevant information of the measuring device, such as the numerical information of the vertical dimension B from the connecting line of the two positioning pins 3 to the dial indicator mounting hole 1d.

[0039] Combination Figure 1 , Figure 2 As shown, this embodiment also provides a method for measuring the spatial dimensions of annular parts of an aircraft engine, using the above-mentioned measuring device, including the following steps:

[0040] S1. Place the measuring device on the top surface of the mouth of the measured part 100;

[0041] S2. Adjust the position of the measuring device so that the outer cylindrical surfaces of the lower ends of the positioning pins 3 on the two support plates 1a respectively abut against the outer cylindrical surfaces of the mouth of the measured part 100; at the same time, the fixing block 6 is clamped on the lower surface of the edge of the mouth of the measured part 100;

[0042] S3, adjust the position of the stop pin 2 on the waist groove 1b, so that the outer peripheral surface of the positioning section 2b of the stop pin 2 abuts against the inner hole of the edge of the mouth of the measured part 100, and the axial limiting section 2c of the stop pin 2 is stuck on the lower surface of the edge of the mouth of the measured part 100, and tighten the knurled nut 9;

[0043] S4, tighten the first knurled flat head screw 4 and the third knurled flat head screw 11 to fix the entire measuring device on the measured part 100;

[0044] S5. Install the dial indicator in the dial indicator mounting hole 1d at the first end of the beam 1, and use the probe of the dial indicator to measure the upper surface of the edge plate 101 of the measured part 100; measure the vertical distance from the center of the stop pin 2 to the line connecting the two positioning pins 3.

[0045] In this embodiment, the diameters of the stop pin 2 and the positioning pin 3 are known values, and the spacing between the two positioning pins 3 is a fixed value, which has been determined when the fixture is designed. The distance between the outer cylindrical surface of the mouth of the measured part 100 and the inner hole of the mouth edge can be measured by a vernier caliper. After measuring the vertical distance from the center of the stop pin 2 to the line connecting the two positioning pins 3, the diameter of the inner hole of the mouth edge of the measured part 100 can be calculated by using the positions of the two positioning pins 3 and one stop pin 2.

[0046] exist Figure 2 In the figure, the dimension A from the upper surface of the edge plate 101 to the lower surface of the mouth edge of the measured part 100 can be measured by a dial indicator, and the vertical dimension B from the line connecting the two locating pins 3 to the dial indicator mounting hole 1d is a known value, thereby determining the target latitude of the measured curved surface on the edge plate 101 relative to the center of the inner hole of the mouth edge of the measured part 100.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A device for measuring the spatial dimensions of annular parts of an aircraft engine, characterized in that: It comprises a crossbeam (1), two positioning pins (3) and a stop pin (2); support plates (1a) are integrally formed on both sides of the first end of the crossbeam (1), and the two support plates (1a) and the crossbeam (1) together form a T-shaped beam structure; The two positioning pins (3) are respectively mounted at positions close to the ends of the two support plates (1a); the stop pin (2) is mounted on the crossbeam (1); a dial indicator mounting hole (1d) is provided at the head of the first end of the crossbeam (1), and a dial indicator is mounted in the dial indicator mounting hole (1d); the dial indicator mounting hole (1d) and the stop pin (2) are both located on the mid-perpendicular line of the line connecting the two positioning pins (3).

2. The device for measuring the spatial dimensions of an aerospace engine annular component according to claim 2, characterized in that: A waist-shaped hole (1b) is provided at the first end of the crossbeam (1); the waist-shaped hole (1b) is located on the midline of the line connecting the two positioning pins (3), and the long direction of the waist-shaped hole (1b) is parallel to the midline of the line connecting the two positioning pins (3); the stepped shaft structure of the stop pin (2) has a diameter that decreases from bottom to top, and comprises an axial limit section (2c), a positioning section (2b), a sliding fit section (2a) and a threaded section in sequence; the sliding fit section (2a) of the stop pin (2) is inserted into the waist-shaped hole (1b), and the threaded section of the stop pin (2) extends out from the waist-shaped hole (1b) and is screwed with a knurled nut (9); the outer peripheral surface of the positioning section (2b) is used to abut against the inner hole of the mouth edge of the measured part (100); the axial limit section (2c) is used to clamp on the lower surface of the mouth edge of the measured part (100).

3. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 2, characterized in that: A fixing block (6) is installed on the lower surface of the second end of the crossbeam (1), and the fixing block (6) is used to be clamped on the lower surface of the edge of the mouth of the measured part (100); A first knurled flat head screw (4) is screwed onto the first end of the cross beam (1), and a third knurled flat head screw (11) is screwed onto the second end of the cross beam (1); the lower ends of the first knurled flat head screw (4) and the third knurled flat head screw (11) are used to respectively tighten against the top surface of the mouth edge of the measured part (100).

4. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 1, characterized in that: The positioning pin (3) is mounted on the support plate (1a) via a hexagonal nut (12) and a flat washer (14).

5. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 4, characterized in that: A screw section is arranged at the top of the positioning pin (3); a positioning pin mounting hole is arranged on the support plate (1a), and the positioning pin mounting hole is a stepped hole which is larger at the bottom and smaller at the top; the step of the positioning pin (3) abuts against the step surface of the positioning pin mounting hole, and the flat washer (14) and the hexagonal nut (12) are mounted on the screw section at the top of the positioning pin (3).

6. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 1, characterized in that: A bushing (15) is embedded in the dial gauge mounting hole (1d).

7. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 6, characterized in that: A second knurled flat head screw (10) is screwed onto the end surface of the head portion of the first end of the cross beam (1); the second knurled flat head screw (10) is pressed against the bushing (15) to fix the dial indicator.

8. The device for measuring the spatial dimensions of an aero-engine annular component according to claim 1, characterized in that: A plurality of lightening holes (1c) are provided on the crossbeam (1).

9. A method for measuring the spatial dimensions of an aero-engine annular component, characterized in that: The device for measuring the spatial dimensions of annular parts of an aircraft engine according to claim 3 comprises the following steps: S1. placing a measuring device on the top surface of the mouth of the part (100) to be measured; S2. Adjust the position of the measuring device so that the outer cylindrical surfaces of the lower ends of the positioning pins (3) on the two support plates (1a) respectively abut against the outer cylindrical surfaces of the mouth of the measured part (100); and at the same time, the fixing block (6) is clamped on the lower surface of the edge of the mouth of the measured part (100); S3, adjusting the position of the stop pin (2) on the waist-shaped groove (1b) so that the outer peripheral surface of the positioning section (2b) of the stop pin (2) abuts against the inner hole of the mouth edge of the measured part (100), and the axial limiting section (2c) of the stop pin (2) is stuck on the lower surface of the mouth edge of the measured part (100), and tightening the knurled nut (9); S4, tightening the first knurled flat head screw (4) and the third knurled flat head screw (11) to fix the entire measuring device on the measured part (100); S5. Install a dial indicator in the dial indicator installation hole (1d) at the first end of the beam (1), and use the probe of the dial indicator to measure the upper surface of the edge plate (101) of the measured part (100).

10. A method for measuring the spatial dimensions of an aero-engine annular component as claimed in claim 9, characterized in that: In step S5, the vertical distance from the center of the stop pin (2) to the line connecting the two positioning pins (3) is measured.

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