Simple device and method suitable for measuring height dimension of compressor blade
By designing a simple measuring device suitable for compressor blades, the problems of large measurement errors and poor repeatability of compressor blade height were solved, and efficient and accurate blade height measurement was achieved.
Patent Information
- Application Number
- CN202511306483.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2025-12-05
AI Technical Summary
Existing methods for measuring compressor blade height suffer from large errors and poor repeatability, and expensive coordinate measuring machines and blue light non-contact measurement equipment have low measurement efficiency.
A simple device was designed, comprising a base, a base plate, a blade tenon clamping assembly, and a probe assembly. The blade tenon clamping assembly enables precise positioning in the XYZ directions, and a dial indicator is used for height measurement to ensure the probe position is fixed.
It achieves high accuracy, low cost, high efficiency, and good repeatability in blade height measurement, and simplifies the measurement operation.
Smart Images
Figure CN121067686A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a simple device and method suitable for measuring the height size of a compressor blade, and belongs to the field of compressor blade maintenance. BACKGROUND
[0002] The compressor blade is a key component of an aero-engine, and the accurate measurement of the height size of the compressor blade is crucial for ensuring the performance and safety of the engine. During the long-term service of the aero-engine, the tip of the compressor blade will inevitably collide with the sealing coating of the casing due to factors such as vibration and casing deformation, resulting in the height size of some blades being ground short. During the overhaul of the aero-engine, the compressor blades need to be disassembled and sent to a blade repair factory for repair. The blade repair factory measures and determines whether the height size of the blade has been ground excessively, and makes disposal methods such as routine repair, tip lengthening repair, and replacement according to the height size of the blade. The traditional measurement method is to stand the blade vertically on a platform and measure the height size of the blade using a height gauge. However, due to the small area of the bottom of the tenon of the blade, the positioning is not accurate when the blade is placed directly on the platform. Moreover, the tip end surface of the blade is a complex curved surface, and the height data measured at different measurement points of the tip are different. Therefore, the traditional measurement method has the disadvantages of inaccurate blade measurement points, large measurement error, and poor repeatability. Some blade repair factories use a three-coordinate measuring instrument or a blue light non-contact measurement device to measure the height size of the blade. Although this method effectively solves the problems of large measurement error and poor repeatability of the traditional method, the three-coordinate measuring instrument or the blue light non-contact measurement device is very expensive, and the measurement of a single blade takes more than 3 minutes, which is low in efficiency. Therefore, it is of great practical significance to develop a simple, efficient, and accurate measurement device and method. SUMMARY
[0003] The purpose of the present application is to provide a simple device and method suitable for measuring the height size of a compressor blade, in order to solve the problems of large error and poor repeatability of the existing measurement method.
[0004] The present application is realized by the following technical solutions:
[0005] A simple device suitable for measuring the height size of a compressor blade, comprising a base 2, a bottom plate 3, a blade tenon clamping assembly 4, a measuring head assembly 6, and a micrometer 7.
[0006] The blade tenon clamping assembly 4 comprises a fixed tenon seat 41, a movable tenon seat 42, a limit pin 43, a sleeve 44, a pin 45, a screw 46, a guide pin 47 and a spring 48. The movable tenon seat 42 and the fixed tenon seat 41 are respectively machined into two halves of dovetail mortise, and the movable tenon seat 42 and the fixed tenon seat 41 are combined to form a complete mortise. The tenon seat 41 has three mutually perpendicular faces as reference A, reference B and reference C. The face where the reference A is located is adjacent to the blade tenon clamping assembly 4, and the reference C is the bottom face. The limit pin 43 is installed in the mortise of the fixed tenon seat 41 close to the reference A, which can ensure the consistency of the position of the blade along the X direction after the blade is installed into the blade tenon clamping assembly 4. The screw 46 passes through the holes of the movable tenon seat 41 and the fixed tenon seat 42. The guide pin 47 is sleeved with the spring 48 and passes through the holes of the movable tenon seat 42 and the fixed tenon seat 41. The pin 45 fixes the screw 46 and the sleeve 44 together. When the blade to be measured is installed into the mortise and the sleeve 44 is tightened, the screw 46 drives the movable tenon seat 42 to gradually move towards the fixed tenon seat 41 and clamps the blade to be measured. The dovetail mortise of the fixed tenon seat 41 serves as the limit face in the Y and Z directions, which ensures the consistency of the position of the blade to be measured along the Y and Z directions after the blade is installed into the blade tenon clamping assembly.
[0007] The measuring head assembly 6 comprises a bracket 61, a measuring head 62, a bushing 63, a measuring rod 64, a handle 65, a sleeve 66, a screw 67, a spring 68, a screw 69, a ring 610, a knurled screw 611 and a circlip 612. The bracket 61 is of C-shaped structure, and the mounting seat at the bottom thereof has reference A, reference B and reference C, which are matched with reference A, reference B and reference C of the tenon seat 41 respectively. The top of the bracket 61 has a vertical and horizontal circular hole. The sleeve 66 is vertically installed in the circular hole at the top of the bracket 61 and is rigidly fixed with the bracket 61 by the screw 67. The measuring rod 64 is installed in the sleeve 66. The handle 65 is rigidly fixed with the measuring rod 66 by being screwed into the horizontal threaded hole in the middle of the measuring rod 66. The sleeve 66 and the bracket 61 at the handle 65 are provided with a long hole for the handle 65 to move up and down. The measuring head 62 is rigidly fixed with the measuring rod 66 by being screwed into the threaded hole at the bottom of the measuring rod 66. The spring 68 and the ring 610 are installed in the sleeve 66. After the spring 68 is compressed, the ring 610 is rigidly fixed with the sleeve 66 by the screw 69. The circlip 612 is installed in the hole at the top of the sleeve 66. The knurled screw 611 is horizontally screwed into the threaded hole of the sleeve 66 close to the top. The end of the screw contacts the circlip 612. The inner diameter of the circlip 612 can be changed by rotating the knurled screw 611, so as to fix the sleeve of the micrometer 7.
[0008] The measuring rod of the micrometer 7 is in rigid contact with the top of the measuring rod 64 after passing through the circlip 612, the ring 610 and the spring 68. The sleeve of the micrometer 7 is rigidly fixed with the circlip 612 by rotating the knurled screw 611 to make the top of the screw extrude the circlip 612.
[0009] The present application realizes accurate positioning of the blade and the tenon clamping assembly, the tenon clamping assembly and the bottom plate and the measuring head assembly in XYZ directions, and the position of the measuring head is fixed, and the accurate height size of the blade to be measured can be obtained by measuring the relative height value of the blade to be measured and the height standard sample blade, the measuring device has low cost, simple measurement operation, high efficiency, high accuracy and good repeatability. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a schematic diagram of the overall structure;
[0011] In the figure: 1 is a screw, 2 is a base, 3 is a bottom plate, 4 is a blade tenon clamping assembly, 5 is a blade to be measured, 6 is a measuring head assembly, and 7 is a micrometer;
[0012] Figure 2 It is a schematic diagram of the blade tenon clamping assembly, wherein Figure b is a N-N sectional view of Figure b, Figure c is a left view of Figure b, Figure d is a perspective view, and Figure e is a top view of Figure b;
[0013] In the figure: 41 is a fixed tenon seat, 42 is a movable tenon seat, 43 is a limit pin, 44 is a screw sleeve, 45 is a pin, 46 is a screw rod, 47 is a guide pin, and 48 is a spring;
[0014] Figure 3 It is a schematic diagram of the measuring head assembly, wherein Figure b is a top view of Figure a, and Figure b is a perspective view;
[0015] In the figure: 61 is a bracket, 62 is a measuring head, 63 is a bushing, 64 is a measuring rod, 65 is a handle, 66 is a sleeve, 67 is a screw, 68 is a spring, 69 is a screw, 610 is a ring, 611 is a knurled screw, and 612 is a circlip. DETAILED DESCRIPTION
[0016] The technical solutions of the present application will be described in further detail below in combination with the drawings, but the protection scope of the present application is not limited to the following description.
[0017] As shown in Figure a, the device is composed of a screw 1, a base 2, a bottom plate 3, a blade tenon clamping assembly 4, a measuring head assembly 6 and a micrometer 7. The device first fixes the base 2 and the bottom plate 3 together through four screws, fixes the blade tenon clamping assembly 4 and the bottom plate 3 together through four screws, and fixes the micrometer 7 and the measuring head assembly 6 together. Figure 1 As shown in Figure b, the device is composed of a screw 1, a base 2, a bottom plate 3, a blade tenon clamping assembly 4, a measuring head assembly 6 and a micrometer 7. The device first fixes the base 2 and the bottom plate 3 together through four screws, fixes the blade tenon clamping assembly 4 and the bottom plate 3 together through four screws, and fixes the micrometer 7 and the measuring head assembly 6 together.
[0018] Figure 2 As shown, the blade tenon clamping assembly 4 consists of a fixed tenon seat 41, a movable tenon seat 42, a limiting pin 43, a threaded sleeve 44, a pin 45, a screw 46, a guide pin 47, and a spring 48. The tops of the movable tenon seat 42 and the fixed tenon seat 41 are respectively machined into the left and right halves of a dovetail-shaped mortise. When the movable tenon seat 42 and the fixed tenon seat 41 are put together, they form a complete mortise. The limiting pin 43 is installed in the mortise of the fixed tenon seat 41 near the reference A. This limiting pin 43 can ensure that the blade under test is positioned in the X direction after being installed in the blade tenon clamping assembly 4. Consistency; the screw 46 passes through the holes of the movable tenon seat 41 and the fixed tenon seat 42; the guide pin 47 is fitted with the spring 48 and passes through the holes of the movable tenon seat 42 and the fixed tenon seat 41; the pin 45 fixes the screw 46 and the screw sleeve 44 together. When the blade to be tested is installed into the tenon groove and the screw sleeve 44 is tightened, the screw 46 drives the movable tenon seat 42 to gradually move towards the fixed tenon seat 41 and clamp the blade to be tested. The dovetail tenon groove of the fixed tenon groove seat 41 serves as the limiting surface in the Y and Z directions to ensure the consistency of the position of the blade to be tested in the Y and Z directions after it is installed into the blade tenon clamping assembly.
[0019] like Figure 3 As shown, the probe assembly 6 consists of a bracket 61, a probe 62, a bushing 63, a probe rod 64, a handle 65, a sleeve 66, a screw 67, a spring 68, a screw 69, a ring 610, a knurled screw 611, and a retaining ring 612. The bracket 61 has a C-shaped structure, with reference points A, B, and C on its bottom mounting base, and a circular inner hole perpendicular to the horizontal plane at its top. The sleeve 66 is vertically installed in the circular inner hole at the top of the bracket 61 and rigidly fixed to the bracket 61 by the screw 67. The probe rod 64 is installed in the sleeve 66, and the handle 65 is screwed into the probe rod via threads. The measuring rod 66 is rigidly fixed in the horizontal threaded hole in the middle of the measuring rod 66. The measuring head 62 is rigidly fixed in the threaded hole at the bottom of the measuring rod 66 through the thread. The spring 68 and the ring 610 are respectively installed in the sleeve. After compressing the spring 68, the ring 610 is rigidly fixed to the sleeve 66 through the screw 69. The retaining ring 612 is installed in the hole at the top of the sleeve 66. The knurled screw 611 is horizontally screwed into the threaded through hole near the top of the sleeve 66. The end of the screw contacts the retaining ring 612. Tightening the knurled thread 611 can change the inner diameter of the retaining ring 612, thereby fixing the sleeve of the dial indicator 7.
[0020] The measuring rod of the dial indicator 7 passes through the retaining ring 612, the ring 610, and the spring 68 and then makes rigid contact with the top of the measuring rod 64. By tightening the knurled screw 611, the top of the screw presses against the retaining ring 612, thus rigidly fixing the sleeve of the dial indicator 7 to the retaining ring 612.
[0021] The measurement method of the present invention will be further described in detail below with reference to the accompanying drawings:
[0022] 1. Loosen Figure 2Due to the elastic force of the spring 48, the screw sleeve 44 in the blade tenon clamping assembly 4 will cause the movable tenon seat 42 to move outward along the guide pin 47, thereby increasing the width of the tenon groove.
[0023] 2. Insert the tenon of the height standard sample blade along the X direction. Figure 2 The blade is precisely fixed in the X direction of the tenon clamping assembly until the blade tenon is in rigid contact with the limiting pin 43 in the mortise of the blade tenon clamping assembly.
[0024] 3 Tighten Figure 2 The screw sleeve 44 and screw 46 drive the movable tenon seat 42 to gradually move towards the fixed tenon seat 41 and clamp the blade, thus completing the precise fixation of the blade in the Y and Z directions of the dovetail tenon of the fixed tenon seat 42.
[0025] 4. Left hand Figure 3 The handle 65 in the probe assembly 6 is lifted upwards, thereby driving the probe rod 64 and the probe 62 to move upwards;
[0026] 5. With the right hand, place the blade tenon clamping assembly 4, which holds the height standard sample blade, on... Figure 1 On the base plate 3 (i.e., the reference C of the tenon clamping assembly 4 is in close contact with the plane of the base plate 3), and their relative positions are moved so that the references A and B of the blade tenon clamping assembly 4 are in close contact with the plane of the base plate 3. Figure 3 The reference A and reference B of the bracket 61 of the middle probe assembly 6 are tightly fitted, and at this time the blade has been accurately positioned in the XYZ directions.
[0027] 6 Left-handed general Figure 3 When the handle 65 in the probe assembly 6 is lowered, the probe rod 64, under the action of the spring 68, drives the probe 62 to make close contact with the point to be measured on the tip of the blade.
[0028] 7. At this point, press the dial indicator 7 zeroing button.
[0029] 8 Left-handed general Figure 3 The handle 65 in the probe assembly 6 is lifted upward, thereby driving the probe rod 64 and the probe 62 to move upward. At this time, the probe 62 separates from the tip of the blade.
[0030] 9. The right hand holds the blade. Figure 1 Once the blade tenon clamping assembly 4 is removed, the left hand can release the grip. Figure 3 The handle in the middle is 65.
[0031] 10 Loosen Figure 2 Due to the elastic force of the spring 48, the screw sleeve 44 in the blade tenon clamping assembly 4 will cause the movable tenon seat 42 to move outward along the guide pin 47, increasing the width of the tenon groove, at which point the blade can be easily removed.
[0032] 11 For the blade to be measured, repeat the above 1-6 operation steps, directly read the value of the dial gauge 8 of the blade to be measured, and add the true height value of the height standard sample blade, and the accurate height size of the blade to be measured can be obtained. Repeat the above 8-10 steps to remove the blade to be measured.
Claims
1. A simple device suitable for measuring the height dimension of a compressor blade, characterized in that: It comprises a base (2), a bottom plate (3), a blade tenon clamping assembly (4), a measuring head assembly (6) and a micrometer (7); the bottom plate (3) is fixed on the base (2), the blade tenon clamping assembly (4) and the measuring head assembly (6) are fixed on the bottom plate (3), and the micrometer (7) is fixedly connected with the measuring head assembly (6); The blade tenon clamping assembly (4) comprises a fixed tenon seat (41), a movable tenon seat (42), a limiting pin (43), a screw sleeve (44), a pin (45), a screw rod (46), a guide pin (47) and a spring (48); the movable tenon seat (42) and the top of the fixed tenon seat (41) are respectively machined into left and right halves of a dovetail groove; when the movable tenon seat (42) and the fixed tenon seat (41) are combined together, a complete tenon groove is formed; the fixed tenon seat (41) has three mutually perpendicular faces as reference A, reference B and reference C; the face where reference A is located is adjacent to the blade tenon clamping assembly (4), and reference C is the bottom face; the limiting pin (43) is installed in the tenon groove of the fixed tenon seat (41) close to reference A, and can ensure the consistency of the position of the blade to be measured along the X direction after the blade to be measured is installed in the blade tenon clamping assembly (4); the screw rod (46) passes through the holes of the movable tenon seat (42) and the fixed tenon seat (41); the guide pin (47) is sleeved with the spring (48) and passes through the holes of the movable tenon seat (42) and the fixed tenon seat (41); the pin (45) fixes the screw rod (46) and the screw sleeve (44) together; when the blade to be measured is installed in the tenon groove and the screw sleeve (44) is tightened, the screw rod (46) drives the movable tenon seat (42) to gradually move towards the fixed tenon seat (41) and clamp the blade to be measured; the dovetail tenon groove of the fixed tenon seat (41) serves as the limiting face in the Y and Z directions, and ensures the consistency of the position of the blade to be measured along the Y and Z directions after the blade to be measured is installed in the blade tenon clamping assembly; The measuring head assembly (6) comprises a bracket (61), a measuring head (62), a bushing (63), a measuring rod (64), a handle (65), a sleeve (66), a screw (67), a spring (68), a screw (69), a ring (610), a knurled screw (611) and a circlip (612). The bracket (61) is in a C-shaped structure, and the bottom of the bracket (61) is provided with a mounting seat, and the mounting seat is provided with a reference A, a reference B and a reference C, respectively. The top of the bracket (61) is provided with a circular inner hole with a vertical and horizontal plane. The sleeve (66) is vertically installed in the circular inner hole at the top of the bracket (61) and is rigidly fixed with the bracket (61) through the screw (67). The measuring rod (64) is installed in the sleeve (66), the handle (65) is screwed into the horizontal threaded hole in the middle of the measuring rod (66) and is rigidly fixed with the measuring rod (66), the sleeve (66) and the bracket (61) at the handle (65) are provided with long holes for the up and down movement of the handle (65), and the measuring head (62) is rigidly connected with the measuring rod (66). The spring (68) and the ring (610) are respectively installed in the sleeve (66), the ring (610) is rigidly fixed with the sleeve (66) through the screw (69) after the compression of the spring (68). The circlip (612) is installed in the hole at the top of the sleeve (66), the knurled screw (611) is horizontally screwed into the threaded hole near the top of the sleeve (66), the end of the screw is in contact with the circlip (612), and the inner diameter size of the circlip (612) can be changed by rotating the knurled screw (611), so that the sleeve of the micrometer (7) is fixed. The measuring rod of the micrometer (7) is in rigid contact with the top of the measuring rod (64) after passing through the circlip (612), the ring (610) and the spring (68), and the sleeve of the micrometer (7) is rigidly fixed with the circlip (612) by pressing the top of the screw to extrude the circlip (612) by tightening the knurled screw (611).
2. A simple device for measuring the height of the compressor blade according to claim 1, characterized in that: The base (2) is fixed on the bottom plate (3) by a screw.
3. A simple device for measuring the height of the compressor blade according to claim 1, characterized in that: The blade tenon clamping assembly (4) and the measuring head assembly (6) are fixed on the bottom plate (3) by a screw.
4. A simple device for measuring the height of the compressor blade according to claim 1, characterized in that: The measuring head (62) is screwed into the threaded hole at the bottom of the measuring rod (66) and is rigidly fixed with the measuring rod (66).
5. A method for measuring the height dimension of a compressor blade, characterized by: The device according to any one of claims 1-4, comprising the following steps: 1) loosen the screw sleeve (44) in the blade tenon clamping assembly (4), because of the elastic force of the spring (48), the movable tenon seat (42) will move outward along the guide pin (47), so that the width of the tenon groove increases; 2) the tenon of the height standard sample blade is installed in the tenon groove of the blade tenon clamping assembly (4) along the X direction until the tenon is in rigid contact with the limiting pin (43), and the precise fixing of the blade in the X direction of the tenon clamping assembly is completed; 3) tighten the screw sleeve (44), the screw rod (46) drives the movable tenon seat (42) to gradually move towards the fixed tenon seat (41) and clamps the blade, and the precise fixing of the blade in the Y and Z directions of the dovetail type tenon groove of the fixed tenon groove seat (42) is completed; 4) lift the handle (65) in the measuring head assembly (6) upwards, so as to drive the measuring rod (64) and the measuring head (62) to move upwards; 5) Put the blade tenon clamping assembly (4) clamped with the height standard sample blade on the base plate (3), and move its relative position to make the datum A and datum B of the blade tenon clamping assembly (4) closely fit the datum A and datum B of the support (61) of the probe assembly (6), at this time the XYZ three directions of the blade have been accurately positioned; 6) Put down the handle (65) in the probe assembly (6), under the action of the spring (68), the measuring rod (64) drives the probe (62) to closely contact with the blade tip end surface to be measured; 7) Press the zero key of the dial gauge (7); 8) Lift up the handle (65) in the probe assembly (6), thereby driving the measuring rod (64) and the probe (62) to move upwards, at this time the probe (62) is separated from the blade tip end surface; 9) After moving away the blade tenon clamping assembly (4) clamped with the blade, the handle (65) can be released; 10) Twist the screw sleeve (44) in the blade tenon clamping assembly (4), because of the elastic force of the spring (48), the movable tenon seat (42) will move outward along the guide pin (47), so that the width of the tenon groove is increased, at this time the blade can be easily removed; 11) For the blade to be measured, repeat the above steps 1)~6), directly read the value of the dial gauge (8) in step 7) for the blade to be measured, and add the true height value of the height standard sample blade, so as to obtain the accurate height size of the blade to be measured, repeat the above steps 8)~10) to remove the blade to be measured.