Device and method for detecting position degree of tenon pin hole of fan rotor blade

Abstract

The invention relates to the technical field of aero-engine blade detection, in particular to a device and method for detecting the position degree of a tenon pin hole of a fan rotor blade. The detection device comprises a bottom plate; the sliding seat and the supporting seat are fixed on the bottom plate, and a horizontal through sliding hole is formed in the supporting seat; the meter setting pin I and the meter setting pin II are fixed on the bottom plate; the positioning block I and the positioning block II are fixed on the support and are arranged up and down at an interval to form a tenon mounting groove; the limiting pin is in interference fit with the support, and the limiting pin is located in the tenon mounting groove and used for positioning the tenon end face of the to-be-detected blade; the pressing block is mounted in the sliding hole of the support in a sliding manner; the eccentric shaft is installed on the support, an eccentric column in the middle of the eccentric shaft is matched with the kidney-shaped hole of the pressing block, and a handle is arranged at the top of the eccentric shaft; the first gauge stand and the second gauge stand are respectively provided with a dial indicator, and the first gauge stand and the second gauge stand are placed on the top face of the sliding base and used for measuring the highest point and the lowest point of the blade tenon pin hole.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine blade detection, and in particular to a device and method for detecting the position accuracy of a tenon pin hole of a fan rotor blade. Background Art

[0002] In aircraft engines, blades, as key components for energy conversion, operate in extremely harsh environments, facing numerous challenges such as high temperatures, high pressures, high speeds, complex aerodynamic loads, thermal stresses, and vibrations. Blade machining quality plays a crucial role in engine performance and reliability, especially the blade tenon. As the connection between the blade and the disc, it bears and transmits high loads, requiring extremely high assembly dimensional accuracy. However, currently, aircraft engine manufacturers face numerous challenges in inspecting blade tenon assembly dimensions, particularly the pin hole position.

[0003] The positioning accuracy of the tenon pinhole (i.e., the offset between the pinhole axis and the tenon's plane of symmetry) directly impacts the assembly quality of the blade and disk, as well as engine performance. Existing testing devices often utilize a vertical clamping system, requiring multiple sets of gauges to be repeatedly inserted into the pinhole for positioning and measurement. This is cumbersome and makes quantifiable measurement results difficult to obtain.

[0004] Based on this, the present invention aims to propose a device and method for detecting the position of the tenon pin hole of a fan rotor blade, so as to solve the problems existing in the prior art such as inconvenient measurement operation and non-quantifiable measurement, and to improve the detection efficiency. Summary of the Invention

[0005] The main purpose of the present invention is to provide a device and method for detecting the position accuracy of the tenon pin hole of a fan rotor blade, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned object, the present invention provides, on the one hand, a device for detecting the position accuracy of a tenon pin hole of a fan rotor blade, comprising:

[0007] base plate;

[0008] The slide and support are fixed on the bottom plate, and a horizontal through-shaped slide hole is provided on the support;

[0009] Alignment pin 1 and alignment pin 2 are fixed to the base plate;

[0010] Positioning block 1 and positioning block 2 are fixed on the support, and are spaced apart from each other to form a tenon mounting groove for cooperating with the tenon of the blade to be inspected;

[0011] A limit pin, which has an interference fit with the support and is located in the tenon mounting groove, is used to position the tenon end face of the blade to be inspected;

[0012] A pressure block is slidably installed in the sliding hole of the support;

[0013] The eccentric shaft is mounted on the support, the eccentric column in the middle of the eccentric shaft cooperates with the waist-shaped hole of the pressure block, and a handle is provided on the top of the eccentric shaft. By turning the handle, the eccentric shaft is rotated to drive the pressure block to press the bottom surface of the tenon of the blade to be inspected;

[0014] The first dial indicator and the second dial indicator are respectively installed on the top surface of the sliding seat for measuring the highest point and the lowest point of the blade tenon pin hole.

[0015] Preferably, the sliding hole on the support is a square hole with a rectangular cross-section; the pressing block is in the shape of a cuboid, and the pressing block is in sliding engagement with the sliding hole.

[0016] Preferably, the meter stand 1 includes a lever 1, a first base, a tension spring and a first bushing; a first U-shaped base and a first L-shaped support are installed on the first base; the middle part of the lever 1 is hinged in the U-shaped groove of the first U-shaped base; the first bushing is vertically embedded in the horizontal rod of the first L-shaped support; a first probe is provided on the top surface of the first end of the lever 1; the second end of the lever 1 is located directly below the first bushing; a lifting eye screw is installed on the first base, and a tension spring is connected between the lifting eye screw and the second end of the lever 1; the first bushing is used to install a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the lever 1.

[0017] Preferably, the second dial stand includes a second lever, a second base, a compression spring and a second bushing; a second U-shaped base and a second L-shaped support are installed on the second base; the middle part of the second lever is hinged in the U-shaped groove of the second U-shaped base; the second bushing is vertically embedded in the horizontal rod of the second L-shaped support; a second probe is provided on the bottom surface of the first end of the second lever; the second end of the second lever is located directly below the second bushing; a column is installed on the second base, the lower end of the compression spring is sleeved on the column, and the upper end of the compression spring rests on the bottom surface of the second end of the second lever; the second bushing is used to install a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the second lever.

[0018] Preferably, an alignment notch is provided on the upper portion of the alignment pin 1; the top surface height of the alignment notch is the same as the theoretical value of the highest point of the tenon pin hole of the clamped blade.

[0019] Preferably, the top end surface of the second alignment pin is a counter surface, and the height of the top surface of the second alignment pin is the same as the theoretical value of the lowest point of the tenon pin hole of the clamped blade.

[0020] Preferably, the handle is sleeved on the top of the eccentric shaft in an interference fit manner, and a cylindrical pin is inserted transversely between the handle and the eccentric shaft.

[0021] Preferably, the positioning block 1 and the positioning block 2 are fixed to the front end surface of the support by screws and pins; a first inclined surface is provided on the positioning block 1, and a second inclined surface is provided on the positioning block 2; the first inclined surface and the second inclined surface are respectively used for contact positioning with the tenon working surface of the fan rotor blade.

[0022] On the other hand, the present invention also provides a method for detecting the position accuracy of the tenon pin hole of a fan rotor blade, using the above-mentioned detection device, comprising the following steps:

[0023] S1. Insert the tenon of the blade to be inspected into the tenon installation groove formed between the positioning block 1 and the positioning block 2, and make the end face of the tenon of the blade to be inspected rest against the limit pin. After clamping, the blade to be inspected is in a horizontal position.

[0024] S2. Turn the handle to drive the eccentric shaft to rotate, so as to drive the pressing block to slide and press the bottom surface of the tenon of the blade to be inspected;

[0025] S3. Install dial indicators on the first and second dial bases, respectively. Use the pair of dial pins to perform a base calibration on the dial indicator on the first dial base, and use the pair of dial pins to perform a base calibration on the dial indicator on the second dial base;

[0026] S4. Use meter base 1 and meter base 2 to measure the highest point and lowest point of the tenon pin hole of the blade to be inspected respectively; the value of the highest point of the tenon pin hole detected by meter base 1 is recorded as reading A; the value of the lowest point of the tenon pin hole detected by meter base 2 is recorded as reading B;

[0027] S5. Calculate the tenon pin hole offset according to the readings A and B in step S4 to obtain the tenon pin hole position detection result.

[0028] Preferably, in step S5, the method for calculating the tenon pin hole offset is:

[0029] When both readings A and B are positive, the offset = (|reading A| + |reading B|) / 2;

[0030] When both readings A and B are negative, the offset = -(|reading A|+|reading B|) / 2;

[0031] When the signs of reading A and reading B are opposite, the offset = (|reading A| - |reading B|) / 2.

[0032] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0033] (1) The detection device and method provided by the present invention adopt a horizontal clamping method so that the tenon pin hole is in a horizontal state. During the detection, the measurement can be completed by taking two meter readings. There is no need to repeatedly use multiple sets of gauges for multiple measurements as in the traditional method, which greatly reduces the measurement time and improves the detection efficiency.

[0034] (2) The measurement result can be obtained intuitively by reading the value of the dial indicator. The offset can be directly obtained by dividing the sum or difference of the absolute values ​​of the two meter readings by 2.

[0035] (3) The detection device and method provided by the present invention can effectively solve the problems existing in the prior art, improve the efficiency and stability of the detection of the position of the tenon pin hole of the fan rotor blade, and ensure the stability and safety of the processing of the aircraft engine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0037] Figure 1 This is a front view of the detection device provided by the present invention;

[0038] Figure 2 for Figure 1 Middle AA section view;

[0039] Figure 3 A top view of the detection device provided by the present invention;

[0040] Figure 4 Schematic diagram of the table base 1 in the present invention;

[0041] Figure 5 Schematic diagram of the second table base in the present invention;

[0042] Figure 6 This is a schematic diagram of aligning the meter using the aligning pin 1;

[0043] Figure 7 This is a schematic diagram of aligning the meter using pin 2.

[0044] Explanation of the accompanying symbols: 1. Base plate; 2. Slide seat; 3. Limit pin; 4. Alignment pin 1; 4a. Alignment notch; 5. Alignment pin 2; 6. Support; 6a. Slide hole; 7. Pressure block; 8. Handle; 8a. Cylindrical pin; 9. Eccentric shaft; 9a. Eccentric column; 10. Positioning block 1; 10a. First inclined plane; 11. Positioning block 2; 11a. Second inclined plane; 12. Alignment base 1; 13. Alignment base 2; 14. Lever 1; 14 a. First probe; 15. First base; 15a. First U-shaped seat; 15b. First L-shaped support; 16. Tension spring; 17. Eye screw; 18. First bushing; 19. Second lever; 19a. Second probe; 20. Second base; 20a. Second U-shaped seat; 20b. Second L-shaped support; 21. Compression spring; 22. Column; 23. Second bushing; 24. Tenon mounting groove; 25. Tightening screw. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not 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" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] As shown in the accompanying drawings, on the one hand, this embodiment provides a device for detecting the position accuracy of a tenon pin hole of a fan rotor blade, comprising:

[0049] Base plate 1;

[0050] The slide 2 and the support 6 are fixed on the top surface of the bottom plate 1, and a horizontal through-shaped slide hole 6a is provided on the support 6; the slide hole 6a passes through the front and rear end surfaces of the support 6;

[0051] Alignment pin 1 4 and alignment pin 2 5 are fixed on the top surface of base plate 1;

[0052] Positioning block 10 and positioning block 2 11 are fixed to the front end surface of the support 6, and are spaced apart from each other to form a tenon mounting groove 24 for cooperating with the tenon of the blade to be inspected;

[0053] The limiting pin 3 is interference-fitted with the support 6 and is located in the tenon mounting groove 24 to position the tenon end face of the blade to be inspected;

[0054] The pressing block 7 is slidably mounted in the sliding hole 6a of the support 6;

[0055] The eccentric shaft 9 is mounted on the support 6. The eccentric column 9a in the middle of the eccentric shaft 9 cooperates with the waist-shaped hole of the pressure block 7. A handle 8 is provided on the top of the eccentric shaft 9. By rotating the handle 8, the eccentric shaft 9 is driven to rotate to drive the pressure block 7 to press the bottom surface of the tenon of the blade to be inspected.

[0056] The dial indicator is installed on the first dial indicator 12 and the second dial indicator 13 respectively. The first dial indicator 12 and the second dial indicator 13 are placed on the top surface of the slide 2 to measure the highest point and the lowest point of the blade tenon pin hole C.

[0057] In this embodiment, the sliding hole 6a on the support 6 is a square hole with a rectangular cross section; the pressing block 7 is in the shape of a cuboid, and the pressing block 7 is in sliding engagement with the sliding hole 6a.

[0058] Combine Figure 4 As shown, the meter stand 12 includes a lever 14, a first base 15, a tension spring 16 and a first bushing 18; a first U-shaped base 15a and a first L-shaped support 15b are installed on the first base 15; the middle part of the lever 14 is hinged in the U-shaped groove of the first U-shaped base 15a; the first bushing 18 is vertically embedded in the horizontal rod of the first L-shaped support 15b; a first probe 14a is provided on the top surface of the first end of the lever 14; the second end of the lever 14 is located directly below the first bushing 18; a lifting eye screw 17 is installed on the first base 15, and a tension spring 16 is connected between the lifting eye screw 17 and the second end of the lever 14; the first bushing 18 is used to install a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the lever 14.

[0059] Combine Figure 5As shown, the dial base 13 includes a lever 19, a second base 20, a compression spring 21 and a second bushing 23; a second U-shaped base 20a and a second L-shaped support 20b are installed on the second base 20; the middle part of the lever 19 is hinged in the U-shaped groove of the second U-shaped base 20a; the second bushing 23 is vertically embedded in the horizontal rod of the second L-shaped support 20b; a second probe 19a is provided on the bottom surface of the first end of the lever 19; the second end of the lever 19 is located directly below the second bushing 23; a column 22 is installed on the second base 20, the lower end of the compression spring 21 is sleeved on the column 22, and the upper end of the compression spring 21 rests on the bottom surface of the second end of the lever 19; the second bushing 23 is used to install a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the lever 19.

[0060] Combine Figure 6 As described above, an alignment notch 4a is provided on the upper portion of the alignment pin 1 4; the top surface height of the alignment notch 4a is the same as the theoretical value of the highest point of the tenon pin hole C of the clamped blade.

[0061] Combine Figure 7 As shown, the top end surface of the second alignment pin 5 is the alignment surface, and the height of the top surface of the second alignment pin 5 is the same as the theoretical value of the lowest point of the tenon pin hole C of the clamped blade.

[0062] Combine Figure 1 As shown, the handle 8 is sleeved on the top of the eccentric shaft 9 in an interference fit manner, and a cylindrical pin 8a is inserted transversely between the handle 8 and the eccentric shaft 9.

[0063] Combine Figure 2 As shown, the positioning block 10 and the positioning block 2 11 are fixed to the front end surface of the support 6 by screws and pins; a first inclined surface 10a is provided on the positioning block 10, and a second inclined surface 11a is provided on the positioning block 2 11; the first inclined surface 10a and the second inclined surface 11a are respectively used for contact positioning with the tenon working surface of the fan rotor blade.

[0064] Combine Figure 3 As shown, tightening screws 25 are screwed onto the first L-shaped support 15b and the second L-shaped support 20b respectively, for tightening the installed dial indicator.

[0065] On the other hand, this embodiment also provides a method for detecting the position accuracy of the tenon pin hole of a fan rotor blade, using the above-mentioned detection device, including the following steps:

[0066] S1. Insert the tenon of the blade to be inspected into the tenon installation groove 24 formed between the positioning block 10 and the positioning block 2 11, and make the tenon end face of the blade to be inspected rest on the limit pin 3. After clamping, the blade to be inspected is in a horizontal position.

[0067] S2. Rotate the handle 8 to drive the eccentric shaft 9 to rotate, thereby driving the pressing block 7 to slide and press the bottom surface of the tenon of the blade to be inspected.

[0068] S3, respectively, a dial indicator (not shown in the figure) is installed on the dial base 12 and the dial base 2 13, and the dial indicator on the dial base 12 is calibrated by using the dial pin 14, and the dial indicator on the dial base 2 13 is calibrated by using the dial pin 25; the comparison process is as follows Figure 6 、 Figure 7 As shown, during alignment, dial indicator base 12 is moved on the top surface of slide 2, so that the first end of lever 14 extends into alignment notch 4a of alignment pin 1, and first probe 14a contacts the top surface of alignment notch 4a. The dial indicator on dial indicator base 12 is then reset to zero. Similarly, dial indicator base 2 is moved on the top surface of slide 2, so that the first end of lever 2 19 is moved above alignment pin 2 5, and second probe 19a abuts the top surface of alignment pin 2 5. The dial indicator on dial indicator base 2 13 is then reset to zero. This completes the alignment operation.

[0069] S4. Use the first gauge 12 and the second gauge 13 to measure the highest point and the lowest point of the tenon pin hole C of the blade to be inspected respectively; the value of the highest point of the tenon pin hole C detected by the first gauge 12 is recorded as reading A; the value of the lowest point of the tenon pin hole C detected by the second gauge 13 is recorded as reading B.

[0070] Combine Figure 4 As shown, when measuring the highest point of the tenon pin hole C, the dial base 12 is moved on the top surface of the slide 2 so that the first end of the lever 14 (the end with the first probe 14a is the first end) extends into the tenon pin hole C, bringing the first probe 14a into contact with the tenon pin hole C. The dial base 12 is then slightly moved left and right, and the dial indicator reading on the dial base 12 is observed. The maximum dial indicator reading is the deflection value of the highest point of the tenon pin hole C. When the highest point of the tenon pin hole C deflects upward, the first end of the lever 14 moves upward, while the second end of the lever 14 moves downward. The probe of the dial indicator mounted in the first bushing 18 extends downward, and the dial indicator pointer deflects. Here, the dial indicator reading A is positive when the highest point of the tenon pin hole C deflects upward. Conversely, when the highest point of the tenon pin hole C deflects downward, the first end of lever 14 moves downward, while the second end of lever 14 moves upward. This pushes the dial indicator probe mounted in the first bushing 18 upward, causing the dial indicator pointer to deflect. Here, when the highest point of the tenon pin hole C deflects downward, the dial indicator reading A is negative. Because the tension spring 16 is always in a stretched state, it exerts a constant downward force on the second end of lever 14, ensuring that the first probe 14a is securely attached to the tenon pin hole C.

[0071] Combine Figure 5As shown, when measuring the lowest point of the tenon pin hole C, the second dial base 13 is moved on the top surface of the slide 2 so that the first end of the second lever 19 (the end with the second probe 19a is the first end) extends into the tenon pin hole C, bringing the second probe 19a into contact with the tenon pin hole C. The second dial base 13 is then slightly moved left and right, and the dial indicator reading on the second dial base 13 is observed. The maximum dial indicator reading is the deflection value of the lowest point of the tenon pin hole C. When the lowest point of the tenon pin hole C deflects upward, the first end of the second lever 19 moves upward, while the second end of the second lever 19 moves downward. The probe of the dial indicator mounted in the second bushing 23 extends downward, and the dial indicator pointer deflects. Here, when the lowest point of the tenon pin hole C deflects upward, the dial indicator reading B is a positive value. Conversely, when the lowest point of the tenon pin hole C deflects downward, the first end of lever 2 19 moves downward, while the second end of lever 2 19 moves upward. This pushes the dial indicator probe mounted in the second bushing 23 upward, causing the dial indicator pointer to deflect. Here, when the lowest point of the tenon pin hole C deflects downward, the dial indicator reading B is negative. Because the compression spring 21 is in a compressed state, it exerts a constant upward force on the second end of lever 2 19, ensuring that the second probe 19a fits securely against the tenon pin hole C.

[0072] S5. Calculate the offset of the tenon pin hole C based on the readings A and B in step S4 to obtain the detection result of the tenon pin hole C position.

[0073] In step S5, the method for calculating the offset of the tenon pin hole C is:

[0074] When both readings A and B are positive, the offset = (|reading A| + |reading B|) / 2;

[0075] When both readings A and B are negative, the offset = -(|reading A|+|reading B|) / 2;

[0076] When the signs of reading A and reading B are opposite, the offset = (|reading A| - |reading B|) / 2.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation 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, is included in the patent protection scope of the present invention.

Claims

1. A device for detecting the position accuracy of the tenon pin hole of a fan rotor blade, characterized in that: include: Bottom plate (1); A sliding seat (2) and a support (6) are fixed on the bottom plate (1), and a horizontal through-shaped sliding hole (6a) is provided on the support (6); Alignment pin 1 (4) and alignment pin 2 (5) are fixed on the base plate (1); Positioning block 1 (10) and positioning block 2 (11) are fixed on the support (6), and are spaced apart from each other to form a tenon mounting groove (24) for cooperating with the tenon of the blade to be inspected; A limit pin (3) is interference-fitted with the support (6), and the limit pin (3) is located in the tenon mounting groove (24) and is used to position the tenon end face of the blade to be inspected; A pressing block (7) is slidably mounted in a sliding hole (6a) of a support (6); An eccentric shaft (9) is mounted on the support (6), an eccentric column (9a) in the middle of the eccentric shaft (9) cooperates with the waist-shaped hole of the pressing block (7), and a handle (8) is provided on the top of the eccentric shaft (9). By rotating the handle (8), the eccentric shaft (9) is driven to rotate to drive the pressing block (7) to press the bottom surface of the tenon of the blade to be inspected; The first dial indicator (12) and the second dial indicator (13) are respectively installed with dial indicators. The first dial indicator (12) and the second dial indicator (13) are placed on the top surface of the slide (2) for measuring the highest point and the lowest point of the blade tenon pin hole.

2. The detection device according to claim 1, wherein The sliding hole (6a) on the support (6) is a square hole with a rectangular cross section; the pressing block (7) is in a rectangular parallelepiped shape, and the pressing block (7) is slidably matched with the sliding hole (6a).

3. The detection device according to claim 1, wherein The table base (12) includes a lever (14), a first base (15), a tension spring (16) and a first bushing (18); A first U-shaped seat (15a) and a first L-shaped support (15b) are installed on the first base (15); The middle portion of the lever (14) is hinged in the U-shaped groove of the first U-shaped seat (15a); The first bushing (18) is vertically embedded in the horizontal rod of the first L-shaped support (15b); A first probe (14a) is provided on the top surface of the first end of the lever (14); the second end of the lever (14) is located directly below the first bushing (18); A lifting eye screw (17) is mounted on the first base (15), and a tension spring (16) is connected between the lifting eye screw (17) and the second end of the lever (14); The first bushing (18) is used for installing a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the lever (14).

4. The detection device according to claim 1, wherein The second table base (13) includes a second lever (19), a second base (20), a compression spring (21) and a second bushing (23); A second U-shaped seat (20a) and a second L-shaped support (20b) are installed on the second base (20); The middle portion of the second lever (19) is hinged in the U-shaped groove of the second U-shaped seat (20a); The second bushing (23) is vertically embedded in the horizontal rod of the second L-shaped support (20b); The bottom surface of the first end of the second lever (19) is provided with a second probe (19a); the second end of the second lever (19) is located directly below the second bushing (23); A column (22) is mounted on the second base (20), the lower end of the compression spring (21) is sleeved on the column (22), and the upper end of the compression spring (21) rests on the bottom surface of the second end of the second lever (19); The second bushing (23) is used for installing a dial indicator, and the probe of the dial indicator rests on the top surface of the second end of the second lever (19).

5. The detection device according to claim 1, wherein An alignment notch (4a) is provided on the upper portion of the alignment pin 1 (4); the top surface height of the alignment notch (4a) is the same as the theoretical value of the highest point of the clamped blade tenon pin hole.

6. The detection device according to claim 1, wherein: The top end surface of the second alignment pin (5) is the alignment surface, and the height of the top surface of the second alignment pin (5) is the same as the theoretical value of the lowest point of the tenon pin hole of the clamped blade.

7. The detection device according to claim 1, wherein The handle (8) is sleeved on the top of the eccentric shaft (9) in an interference fit manner, and a cylindrical pin (8a) is inserted transversely on the handle (8) and the eccentric shaft (9).

8. The detection device according to claim 1, wherein: The positioning block 1 (10) and the positioning block 2 (11) are fixed on the front end surface of the support (6) by screws and pins; a first inclined surface (10a) is provided on the positioning block 1 (10), and a second inclined surface (11a) is provided on the positioning block 2 (11); the first inclined surface (10a) and the second inclined surface (11a) are respectively used for contacting and positioning with the tenon working surface of the fan rotor blade.

9. A method for detecting the position accuracy of the tenon pin hole of a fan rotor blade, characterized in that: The detection device according to any one of claims 1 to 8 comprises the following steps: S1. Insert the tenon of the blade to be inspected into the tenon mounting groove (24) formed between the first positioning block (10) and the second positioning block (11), and make the end face of the tenon of the blade to be inspected rest against the limit pin (3). After clamping, the blade to be inspected is in a horizontal position. S2. The eccentric shaft (9) is rotated by turning the handle (8) to drive the pressing block (7) to slide and press the bottom surface of the tenon of the blade to be inspected; S3. A dial indicator is installed on the first dial indicator stand (12) and the second dial indicator stand (13), and the dial indicator on the first dial indicator stand (12) is calibrated using the first dial indicator pin (4), and the dial indicator on the second dial indicator stand (13) is calibrated using the second dial indicator pin (5); S4. Use the first gauge (12) and the second gauge (13) to measure the highest point and the lowest point of the tenon pin hole of the blade to be inspected respectively; the value of the highest point of the tenon pin hole detected by the first gauge (12) is recorded as reading A; the value of the lowest point of the tenon pin hole detected by the second gauge (13) is recorded as reading B; S5. Calculate the tenon pin hole offset according to the readings A and B in step S4 to obtain the tenon pin hole position detection result.

10. A method for detecting the position accuracy of a fan rotor blade tenon pin hole according to claim 8, characterized in that: In step S5, the method for calculating the tenon pin hole offset is: When both readings A and B are positive, the offset = (|reading A| + |reading B|) / 2; When both readings A and B are negative, the offset = -(|reading A|+|reading B|) / 2; When the signs of reading A and reading B are opposite, the offset = (|reading A| - |reading B|) / 2.

Images