Aero-engine blade size measuring system

Abstract

The invention belongs to the technical field of engine blade measurement, and particularly relates to an aero-engine blade size measuring system which comprises a blade mounting seat and a measuring assembly, a clamp is arranged on the blade mounting seat, and a stator blade is clamped on the clamp through a shaft neck to position the axis of the stator blade; a positioning frame is arranged on the blade mounting seat, the top end of the positioning frame transversely extends to be provided with a bending block, the bending block is provided with two positioning surfaces which are perpendicular to each other, and the two positioning surfaces coincide with the axis of the stator blade; the measuring assembly comprises a dial indicator and a measuring block which are oppositely arranged on the two sides of the blade mounting seat, the dial indicator is arranged on a dial indicator seat in a liftable mode, and the measuring block is arranged on the support in a liftable mode; the two measuring assemblies are perpendicular to each other, measuring rods of the two dial indicators are arranged right opposite to the corresponding positioning faces respectively, and the measuring blocks can transversely move to make contact with the outer arc face of the stator blade. A blade measurement value is converted into visible plane data from a space size through a clamp, and then efficient measurement is performed on a production field by adopting a universal measuring tool.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine blade measurement, and particularly relates to a measurement system for the dimensions of an aero-engine blade. Background Art

[0002] Some parts of the first-stage stator blades of a certain type of aero-engine are thin. When in use, the first-stage stator blades are in a high-temperature working state. When the first-stage stator blades reach the major overhaul period, the blades are deformed. During the major overhaul, it is necessary to repair the profile of the first-stage stator blades. After the repair of the first-stage stator blades, it is necessary to measure the cross-sectional dimensions at multiple locations of the first-stage stator blades.

[0003] As Figure 15 and Figure 16 shown, the blade profile of the stator blade 4 is a spatial curved surface. The stator blade is divided into multiple cross-sections along the height H of the stator blade. At each cross-section, it is necessary to measure the dimensions L1 and L2 at the cross-section. It can be seen from the figure that the multiple cross-sectional dimensions L1 and L2 of the first-stage stator blade cross-section are spatial dimensions and cannot be directly measured by conventional measurement methods.

[0004] Currently, a 3D scanning measuring instrument or a 3D image measuring instrument is used to construct the three-dimensional shape of the product, and then the computer analyzes the image, extracts the feature points on the surface of the product, and calculates the coordinates of the feature points to obtain the required dimensions. The use of a 3D scanning measuring instrument or a 3D image measuring instrument is costly, has high requirements for the measurement environment, and high requirements for the operator in the later measurement processing. It cannot perform on-site dimension measurement, takes a long time to measure, and has low work efficiency. Summary of the Invention

[0005] Aiming at the technical problems existing in the background art, the present invention provides a measurement system for the dimensions of an aero-engine blade.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows:

[0007] A system for measuring the size of an aero-engine blade comprises a blade mounting seat, a fixture, a stator blade and a measuring assembly, wherein the blade mounting seat is provided with a fixture, a shaft neck is provided on the bottom side of the stator blade, and the stator blade is clamped on the fixture by the shaft neck to position the axis of the stator blade; the blade mounting seat is provided with a positioning frame, and a bending block is provided on the top end of the positioning frame to extend laterally, the bending block is staggered with the stator blade in a top-view direction, and the bending block has two positioning surfaces perpendicular to each other, and the two positioning surfaces both coincide with the axis of the stator blade; the measuring assembly comprises a dial indicator and a measuring block relatively arranged on both sides of the blade mounting seat, the dial indicator can be lifted and lowered on the dial indicator seat, and the measuring block can be lifted and lowered on the support; two measuring assemblies are perpendicular to each other, and the measuring rods of the two dial indicators are respectively arranged opposite to the corresponding positioning surfaces, and the measuring block can be moved laterally to contact the outer arc surface of the stator blade.

[0008] Optionally, the stator blade has an axial positioning surface, and a line that is at an angle of 26° to the axial positioning surface and passes through the axis of the stator blade is a positioning reference X-axis for measuring the size of the stator blade, and the positioning reference X-axis coincides with one of the positioning surfaces.

[0009] Optionally, the aircraft engine blade size measuring system also includes a base, and the blade mounting seat, dial indicator seat and support are all arranged on the base; the dial indicator seat is slidably provided with a dial indicator slider inside, and a positioning cylinder is provided on the outside of the dial indicator, and the positioning cylinder is detachably provided inside the dial indicator slider; a first screw is provided at the upper end of the dial indicator slider, and an adjustment nut is rotatably provided at the upper end of the dial indicator seat, and the first screw is cooperatively connected with the adjustment nut; a translation platform is slidably provided inside the support, and a second screw is provided at the upper end of the translation platform, and an adjustment nut is rotatably provided at the upper end of the support, and the second screw is cooperatively connected with the adjustment nut; a sliding column is provided at one end of the measuring block, and the sliding column is slidably provided inside the translation platform, and the outer section of the sliding column is threadedly connected with an adjustment handle.

[0010] Optionally, two translation platforms are provided, and sliding rods are vertically provided on both sides of the support, and the translation platform is slidably provided on the sliding rods; a connecting block is provided at the bottom end of the second screw rod, and the two sliding rods are connected by the connecting block; a through groove is provided inside the support, and the connecting block is slidably provided in the through groove.

[0011] Optionally, a plurality of positioning holes for positioning the stator blade profile are vertically arranged on both sides of the through slot, and pin holes are arranged on both sides of the translation platform. After the pin holes are aligned with the positioning holes, limiting pins are inserted and fixed.

[0012] Optionally, a compression spring is provided on the sliding column between the measuring block and the translation stage.

[0013] Optionally, the measuring rod extends from the positioning tube, and a planar probe is provided at the end of the measuring rod.

[0014] Optionally, the positioning cylinder includes a cylinder body with different outer diameters at both ends, a dial indicator clamp is provided inside the dial indicator slider, the cylinder body at one end of the positioning cylinder with a smaller diameter is provided in the dial indicator clamp, and a locking screw for tightening the dial indicator clamp is provided on the dial indicator slider.

[0015] Optionally, a first mounting groove is provided on the blade mounting seat, a positioning hole is provided in the first mounting groove, and the shaft neck is arranged in the positioning hole; the clamp includes two clamping blocks which are relatively slidably arranged in the first mounting groove, and the clamping blocks move relative to each other to clamp the shaft neck.

[0016] The present invention has the following advantages and beneficial effects:

[0017] In the present invention, the blade measurement value is converted from a spatial dimension into visible plane data through a fixture, and then a universal measuring tool is used to perform efficient measurement on site.

[0018] When measuring, insert the dial indicator into the gauge clamp, adjust the height of the dial indicator until the dial indicator flat probe is located in the middle of one of the positioning surfaces on the blade mounting seat, lock the dial indicator and adjust it to zero. Then adjust the height of the measuring block upward to the height position of one of the measuring sections, insert the limit pin to fix it. Adjust the lateral position of the measuring block, and move the measuring block toward the blade until it contacts the blade.

[0019] Then, hold the rear handle of the dial indicator with one hand, pull the handle to the rear of the dial indicator to separate the plane probe from the positioning surface, lower the height of the dial indicator, and visually check that the center of the plane probe is roughly in the same plane as the measurement surface of the measuring block. Hold the rear handle of the dial indicator and slowly move the plane probe so that the plane probe contacts the measuring surface of the measuring block. At this time, the data displayed by the dial indicator is one of the dimensions that need to be measured on the blade section. Using the above method, the coordinates of multiple surface space dimensions on the stator blade can be quickly and accurately measured, and the dimension measurement can be performed at the production site with high measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 One of the structural diagrams of the blade size measurement system in the present invention;

[0021] Figure 2 for Figure 1 A top view of

[0022] Figure 3 This is the second structural diagram of the blade size measurement system in the present invention;

[0023] Figure 4 The third structural diagram of the blade size measurement system in the present invention;

[0024] Figure 5 is the front view of Figure 4 ;

[0025] Figure 6 is the top view of Figure 5 ;

[0026] Figure 7 is the coordinate system structure diagram after the stator blade is clamped by the blade size measurement system in the present invention;

[0027] Figure 8 is the structure diagram of zero adjustment when the measuring rod contacts the positioning surface in the present invention;

[0028] Figure 9 is the structure diagram of the support in the present invention;

[0029] Figure 10 is the structure diagram of the dial indicator slider, the first screw rod and the adjusting nut in the present invention;

[0030] Figure 11 is one of the structure diagrams of the blade mounting seat in the present invention;

[0031] Figure 12 is another structure diagram of the blade mounting seat in the present invention;

[0032] Figure 13 is the top view of Figure 12 ;

[0033] Figure 14 is the coordinate system structure diagram of the blade mounting seat in the top view direction in the present invention;

[0034] Figure 15 is the front view of the stator blade in the present invention;

[0035] Figure 16 is the sectional view of a certain profile surface of the stator blade in the present invention;

[0036] Figure 17 is the structure diagram of the fixture on the blade mounting seat in the present invention;

[0037] Figure 18 is the top view of Figure 17 ;

[0038] Figure 19 is the structure diagram of the blade being clamped by the fixture on the blade mounting seat in the present invention.

[0039] Reference numerals: 1 - base, 2 - blade mounting seat, 21 - positioning shaft, 22 - second connection hole, 23 - positioning frame, 24 - bending block, 3 - fixing plate, 31 - first mounting groove, 311 - positioning hole, 32 - second mounting groove, 33 - first clamping block, 34 - second clamping block, 35 - fixing seat, 36 - tightening screw, 37 - tightening block, 38 - clamping screw, 39 - clamping nut, 4 - stator blade, 41 - blade base, 42 - journal, 5 - support, 51 - through groove, 52 - positioning hole, 53 - scale, 54 - intermediate through hole, 55 - first connection hole, 56 - fixing table, 57 - first sliding hole, 58 - second sliding hole, 6 - measuring block, 61 - sliding column, 611 - compression spring, 62 - adjusting handle, 63 - translation table, 64 - connecting block, 65 - second screw, 66 - adjusting nut, 661 - rotating ring, 67 - nut pressing block, 68 - sliding rod, 69 - limit pin, 7 - dial indicator base, 71 - sliding groove, 72 - slider pressing plate, 8 - dial indicator slider, 81 - first screw, 82 - locking screw, 83 - gauge clamp, 9 - dial indicator, 91 - positioning cylinder, 92 - measuring rod, 93 - flat probe. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment

[0043] As Figures 1 to 7 shown, an aero - engine blade size measurement system includes a blade mounting seat 2, a fixture, a stator blade 4, a measuring assembly, etc.

[0044] As Figures 1 to 7As shown, the blade mounting base 2 serves as the main structure for fixing the blade and provides the X and Y axis reference planes for measurement. A clamp is provided on the blade mounting base 2, and a journal 42 is provided on the bottom side of the stator blade 4. The stator blade 4 is clamped on the clamp through the journal 42 to position the axis b1 of the stator blade 4; a positioning bracket 23 is provided on the blade mounting base 2, and a bending block 24 is horizontally extended at the top of the positioning bracket 23. The bending block 24 is offset from the stator blade 4 in the top view direction. The bending block 24 has two positioning surfaces perpendicular to each other, and both positioning surfaces coincide with the axis of the stator blade 4.

[0045] As Figures 1 to 7 shown, the measuring assembly includes dial indicators 9 and measuring blocks 6 oppositely arranged on both sides of the blade mounting base 2. The dial indicators 9 are vertically movably arranged on the dial indicator seats 7, and the measuring blocks 6 are vertically movably arranged on the supports 5, and the positions of the dial indicators 9 and the measuring blocks 6 can be adjusted to different heights of the surface of the stator blade 4. Two measuring assemblies are arranged perpendicular to each other. The measuring rods 92 of the two dial indicators 9 are respectively arranged facing the corresponding positioning surfaces. That is to say, the two dial indicators 9 are arranged perpendicular to each other, the two measuring blocks 6 are arranged perpendicular to each other, and the measuring blocks 6 can be laterally moved into contact with the outer arc surface of the stator blade 4.

[0046] As Figures 14 to 16 shown, the stator blade 4 has an axial positioning surface B. The line that forms an angle of 26° with the axial positioning surface B and passes through the axis b1 of the stator blade 4 is the positioning reference X axis for measuring the dimensions of the stator blade 4, and the positioning reference X axis coincides with one of the positioning surfaces.

[0047] As Figures 1 to 16 shown, in the present invention, the positioning surface includes a first positioning surface F and a second positioning surface E. Among them, the first positioning surface F coincides with the positioning reference X axis, and the second positioning surface E coincides with the positioning reference Y axis. That is to say, after the stator blade 4 is clamped and fixed by the clamp, the first positioning surface F and the second positioning surface E are positioned to coincide with the axis b1 of the stator blade 4, realizing the reference positioning of the clamping origin. Since the bending block 24 is arranged at the top of the positioning bracket 23 and does not contact the stator blade 4, and at the same time, in the top view direction, the stator blade 4 and the bending block 24 are also staggered, the first positioning surface F and the second positioning surface E can be used as the origin of the coordinate system for subsequent measurement.

[0048] The blade mounting base 2 positions the blade axis b1 with a clamp according to the structural characteristics of the stator blade 4. Find the blade axis b1 on the blade mounting base 2, determine the positions of the X and Y axis required for measurement, and solidify the X and Y axis on the blade mounting base 2. That is, the X and Y axis are perpendicular to the upper surface of the base 1 to form two surfaces, which serve as the zero reference surfaces for alignment in later measurement, that is, the first positioning surface F and the second positioning surface E.

[0049] As Figures 1 to 10As shown in the figure, in the present invention, the aero-engine blade size measurement system further includes a base 1, and the blade mounting seat 2, the dial indicator seat 7 and the support 5 are all detachably arranged on the base 1.

[0050] As Figures 1 to 10 shown, a chute 71 is vertically formed inside the dial indicator seat 7, and a dial indicator slider 8 is slidably arranged in the chute 71 of the dial indicator seat 7. The dial indicator 9 includes a positioning cylinder 91, a measuring rod 92, a handle, etc. A positioning cylinder 91 is arranged on the outer side of the dial indicator 9, and one end of the measuring rod 92 extends out of the positioning cylinder 91. The positioning cylinder 91 is detachably arranged inside the dial indicator slider 8. A first screw rod 81 is arranged at the upper end of the dial indicator slider 8, and an adjusting nut 66 is rotatably arranged at the upper end of the dial indicator seat 7. The first screw rod 81 is in mating connection with the adjusting nut 66. By rotating the adjusting nut 66, the dial indicator slider 8 is driven to move up and down, realizing the up and down movement of the dial indicator 9.

[0051] As Figures 1 to 10 shown, a translation table 63 is slidably arranged inside the support 5. A second screw rod 65 is arranged at the upper end of the translation table 63, and an adjusting nut 66 is rotatably arranged at the upper end of the support 5. The second screw rod 65 extends out from the upper end of the support 5 and is in mating connection with the adjusting nut 66; one end of the measuring block 6 is provided with a sliding column 61, and the sliding column 61 is slidably arranged inside the translation table 63. A plane is formed on the surface of the sliding column 61, that is to say, the sliding column 61 is not a cylinder, so that the sliding column 61 can be slidably limited on the inner hole of the translation table 63 to avoid rotation; an adjusting handle 62 is threadedly connected to the outer section of the sliding column 61. By adjusting the adjusting handle 62, the horizontal expansion and contraction of the measuring block 6 is adjusted to make it contact with the surface of the stator blade 4. By rotating the adjusting nut 66, the translation table 63 is driven to move up and down, realizing the up and down movement of the measuring block 6.

[0052] As Figure 3 、 Figure 4 、 Figure 9 and Figure 10 shown, for the fixation of the adjusting nut 66, wherein, a plurality of first connection holes 55 and a middle through hole 54 are arranged at the upper end of the support 5. The second screw rod 65 passes through the middle through hole 54. Two nut pressing blocks 67 are arranged at the upper end of the support 5 by using screws. A stepped semi-circular hole is arranged inside the nut pressing block 67. A slider pressing plate 72 is arranged at the upper end of the dial indicator seat 7. Two nut pressing blocks 67 are arranged at the upper end of the slider pressing plate 72 by using screws. A rotating ring 661 is arranged at the bottom end of the adjusting nut 66. The inner holes of the two nut pressing blocks 67 are closely arranged against the rotating ring 661, and the rotational installation of the adjusting nut 66 can be realized.

[0053] As Figures 1 to 10As shown, there are two translation stages 63. On both sides of the support 5, slide bars 68 are vertically arranged. Specifically, the support 5 is in the shape of an I-beam. A fixed platform 56 is arranged at the bottom side of the support 5. Two first sliding holes 57 are formed in the fixed platform 56. Second sliding holes 58 corresponding to the first sliding holes 57 are formed in the upper side of the support 5. The slide bars 68 pass through the first sliding holes 57 and are inserted into the second sliding holes 58, and the slide bars 68 are pressed tightly by nut blocks 67. The two translation stages 63 are respectively slidably arranged on the slide bars 68 on both sides of the support 5. A connecting block 64 is arranged at the bottom end of the second screw rod 65. The two slide bars 68 are connected into a whole through the connecting block 64. A through groove 51 is arranged inside the support 5. The connecting block 64 is slidably arranged in the through groove 51.

[0054] As Figures 1 to 10 shown, a number of positioning holes 52 for positioning the profile of the stator blade 4 are vertically arranged on both sides of the through groove 51. The positioning holes 52 penetrate through the support 5. A scale 53 and a cross-sectional dimension are correspondingly marked on each positioning hole 52, which respectively correspond to the profiles at different heights on the stator blade 4 and are used for visual observation when adjusting the height of the measuring block 6. Pin holes are arranged on both sides of the translation stage 63. After the pin holes are aligned with the positioning holes 52, limit pins 69 are inserted and fixed, so that the measuring block 6 is fixed on the profile at a certain scale 53.

[0055] As Figures 1 to 10 shown, a compression spring 611 is arranged on the slide post 61 between the measuring block 6 and the translation stage 63. The compression spring 611 always gives a pressure to the measuring block 6. After the slide post 61 moves forward to the measuring position of the stator blade 4, the adjusting handle 62 is continuously rotated. At this time, the measuring block 6 keeps in contact with the surface of the blade to be measured under the action of the compression spring 611. At this time, the pressure between the measuring block 6 and the blade is determined by the compression spring 611. Here, a compression spring 611 with a smaller elastic force is selected, and the spring is controlled to be only slightly larger than the force that can open the measuring block 6. Because the blade is thin, if the spring tension is too large, the blade will be deformed, thus affecting the measurement accuracy. After the measuring block 6 moves to the cross-section to be measured, the limit pin 69 is inserted to accurately position the height dimension of the cross-section.

[0056] The support 5 provides support for the measuring block 6. At the same time, when the measuring block 6 measures cross-sectional dimensions of different sizes, the height of the measuring block 6 is adjusted according to different cross-sectional positions. At the same time, the measuring block 6 can be telescopic. When not measuring, the measuring block 6 moves away from the surface of the stator blade 4 to be measured. When measuring, the measuring block 6 comes into contact with the surface of the stator blade 4 to be measured. There are two supports 5, which are respectively used for measuring the dimensions of the blade in the X-axis and Y-axis directions.

[0057] Opposite to the mechanism of the measuring block 6, a dial indicator adjusting mechanism is designed. The dial indicator adjusting mechanism is used to provide stable support for the dial indicator 9, and at the same time, the dial indicator 9 is adjusted in height according to different measuring cross-sections.

[0058] As Figures 1 to 10As shown, the measuring rod 92 extends from within the positioning cylinder 91, and a flat probe 93 is provided at the end of the measuring rod 92. The present invention uses a digital display dial indicator 9, and the head of the dial indicator 9 is selected as the flat probe 93. Because to ensure the height dimension of the measurement section, the measuring surface of the measuring block 6 is close to a straight line. The flat probe is used because the measuring surface area of the flat probe is large, which is convenient for easily finding the contact surface between the flat probe 93 and the measuring block 6 during measurement, so as to facilitate measurement. The digital display dial indicator 9 transmits the measurement data to the digital repair system through the network to achieve online measurement and real-time online data transmission. There is no need for manual data input. This greatly reduces the problems of low work efficiency and easy data transmission errors in the traditional data input method.

[0059] As Figures 1 to 10 shown, the positioning cylinder 91 includes a cylinder body with different outer diameters at both ends. A clamp 83 is provided inside the dial indicator slider 8. The cylinder body with a smaller diameter of the positioning cylinder 91 is arranged inside the clamp 83. A locking screw 82 for tightly pressing the clamp 83 is provided on the dial indicator slider 8. The locking screw 82 is connected to the threaded hole on the dial indicator slider 8 and extends into the dial indicator slider 8 to tightly press the clamp 83.

[0060] As Figures 1 to 10 shown, a fixing plate 3 is provided on the blade mounting seat 2. A first mounting groove 31 is formed on the fixing plate 3, and a clamping hole 311 is provided inside the first mounting groove 31. The journal 42 is arranged inside the clamping hole 311 for positioning and installation. The fixture includes two clamping blocks that slide relative to each other in the first mounting groove 31. The two clamping blocks are of a V-shaped structure, and the journal 42 is clamped and fixed to the stator blade 4 by the relative movement of the two clamping blocks.

[0061] As Figure 11 shown, a positioning shaft 21 is provided on the bottom side of the blade mounting seat 2. The positioning shaft 21 is inserted into the through hole of the base 1 to position and install the blade mounting seat 2. A number of second connection holes 22 are formed in the circumference of the blade mounting seat 2, and the blade mounting seat 2 is fixed to the base 1 by inserting pins and screwing in screws in the second connection holes 22.

[0062] As Figures 15 to 19As shown in the figure, the bottom side of the stator vane 4 has a vane base 41, and the bottom plane of the vane base 41 is the positioning and installation plane A, which is closely arranged on the upper surface of the clamping block. Among them, the fixed disk 3 is provided with a second installation groove 32 communicating with the first installation groove 31, and a fixed seat 35 is arranged in the second installation groove 32. The clamping block includes a first clamping block 33 and a second clamping block 34. The first clamping block 33 is arranged in the first installation groove 34. The second clamping block 34 is hollow inside, and the second clamping block 34 is sleeved outside the first clamping block 33. The second clamping block 34 is slidably arranged in the first installation groove 31. The clamping hole 311 is located between the first clamping block 33 and the second clamping block 34. One end of the second clamping block 33 is provided with a clamping screw 38, and the clamping screw 38 passes through the inside of the fixed seat 35. A clamping nut 39 is threadedly connected to the clamping screw 38; a tightening screw 36 is threadedly connected to the fixed seat 35, and a tightening block 37 is slidably arranged on the upper side of the first clamping block 33, and the end of the tightening screw 36 is closely attached to the tightening block 37.

[0063] When clamping the stator vane 4, place the journal 42 in the clamping hole 311, then the first clamping block 33 and the second clamping block 34 approach to clamp the journal 42. At the same time, the tightening block 37 is tightened on the positioning and installation plane B, and the positioning and clamping of the stator vane 4 can be realized. At this time, the X-axis axis coincides with the first positioning surface F, which is the zero position of the dial indicator 9, and the Y-axis axis coincides with the second positioning surface E, which is the zero position of the dial indicator 9.

[0064] As Figure 16 shown, the cross-sectional dimensions L1 and L2 of the first-stage stator vane 4 are spatial dimensions and cannot be directly measured by conventional measurement methods.

[0065] The device of the present invention designs a special measurement system to transfer the L1 and L2 values to visible entities and perform on-site measurement with conventional measurement tools. A special fixture is designed. Using the journal 42 of the stator vane 4, the axis b1 of the vane is positioned, and the vane is fixedly clamped. Taking the B surface of the vane as the reference, the physical measurement reference X and Y axes are determined, and the angles between the X and Y axes and the B surface are determined. A measuring block 6 is designed on the fixture, and the measuring surface of the measuring block 6 is parallel to the X and Y axes. Adjust the height of the measuring block 6 from the A surface according to the distance from the cross-section of the stator vane 4 to the A surface, and then translate the measuring block 6 to the C surface and D surface shown in the figure (i.e., contact with the stator vane 4). Determine the origin positions of the X and Y axis axes through the fixture, and take the first positioning surface F and the second positioning surface E as the zero positions of the dial indicator 9 respectively. By the telescopic movement of the measuring rod 92 of the dial indicator 9, measure the distances from the C surface to the E surface and from the D surface to the F surface. This value is the L1 and L2 values.

[0066] The key point of this measurement system is to convert the vane measurement value from a spatial dimension to visible plane data through the fixture, and then use a general measuring tool for measurement. The present invention uses a digital display dial indicator 9 to transmit the measurement data to the digital repair system through the network to realize on-line measurement and on-line real-time data transmission.

[0067] The blade size measurement system of a certain type of aircraft engine designed by the present invention can measure multiple cross-sectional dimensions on the first-stage stator blade 4, with accurate detection data, simple operation, fast detection speed, and can greatly improve detection efficiency, without requiring the operating skills of the operator. The present invention realizes online measurement, and the online real-time data transmission does not require manual data calculation. It greatly reduces the low working efficiency of the traditional data input method and the problem of easy data transmission errors.

[0068] Measuring principle:

[0069] Clamp the stator blade 4 and enter the measurement process.

[0070] Measure first Figure 16 Indicates the size of L1. Take out the digital dial indicator 9 and insert the data line. Insert the dial indicator 9 into the dial indicator slider 8, and adjust the height of the dial indicator 9 until the flat probe 93 of the dial indicator 9 is located in the middle of the second positioning surface E on the blade mounting seat 2, and the E surface coincides with the Y axis. Adjust the position of the dial indicator and control the extension and contraction of the dial indicator rod between 10 and 15 mm. At this time, pay attention to the dial indicator dial facing upwards for easy reading. Lock the dial indicator and press the digital dial indicator origin setting button. The data displayed by the dial indicator 9 is 0.

[0071] Adjust the height of the measuring block 6, pull out the limit pin 69 in the corresponding direction, adjust the height of the measuring block 6 upward, and drive the measuring block to the uppermost profile of the stator blade. When the scale line on the measuring block 6 is aligned with the scale line reference on the translation stage 63, insert the limit pin 69. At this time, the height of the measuring point of the measuring block 6 is the measuring section. Rotate the adjustment handle 62, and the measuring block 6 moves toward the stator blade 4 until the measuring block 6 contacts the blade. At this time, the measuring surface of the measuring block 6 is pressed against the blade cross section by the compression spring 611. Figure 16 Indicates the C surface.

[0072] Hold the rear handle of the dial indicator 9 with one hand, pull the handle toward the rear of the dial indicator to separate the plane probe 93 from the E surface, lower the height of the dial indicator 9, and visually check that the center of the plane probe 93 is roughly in the same plane as the measuring surface of the measuring block 6. Fix the height of the dial indicator 9, hold the rear handle of the dial indicator, and slowly move the plane probe 93 so that the plane probe 93 contacts the measuring surface of the measuring block 6. At this time, it should be noted that the plane probe of the dial indicator needs to be controlled to move slowly, and the rear handle of the dial indicator must not be released suddenly, so that the plane probe 93 and the measuring block 6 will impact, thereby affecting the measurement accuracy. After the plane probe 93 contacts the measuring block 6, release the rear handle of the dial indicator. At this time, the dial indicator 9 displays data, which is the L1 dimension that needs to be measured on the cross section of the stator blade 4. Press the confirmation key of the digital display dial indicator to confirm the measurement data and transmit it online to the digital repair system.

[0073] In the same way, control the measuring block 6 to reach the surface of the stator blade 4 at different heights until the dimensional measurement of all sections is completed.

[0074] Prepare to measure the dimension shown in L2. The dimension measurement method is the same as described above. The first positioning surface F shown in the figure coincides with the X-axis. After all the dimension measurements are completed, the data is stored in the digital repair system for ready call or printing.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An aero-engine blade size measurement system, characterized in that: It includes a blade mounting base, a fixture, a stator blade, and a measuring assembly. A fixture is provided on the blade mounting base. A journal is provided on the bottom side of the stator blade, and the stator blade is clamped on the fixture through the journal to position the axis of the stator blade. A positioning frame is provided on the blade mounting base. A bent block extends horizontally at the top end of the positioning frame. The bent block is offset from the stator blade in the top view direction. The bent block has two positioning surfaces perpendicular to each other, and both positioning surfaces coincide with the axis of the stator blade. The measuring assembly includes dial indicators and measuring blocks oppositely arranged on both sides of the blade mounting base. The dial indicators are vertically movably arranged on dial indicator seats, and the measuring blocks are vertically movably arranged on supports. There are two measuring assemblies arranged perpendicular to each other. The measuring rods of the two dial indicators are respectively arranged facing the corresponding positioning surfaces, and the measuring blocks can be horizontally moved into contact with the outer arc surface of the stator blade.

2. The aero-engine blade size measurement system according to claim 1, characterized in that: The stator blade has an axial positioning surface. The line that forms a 26° angle with the axial positioning surface and passes through the axis of the stator blade is the positioning reference X-axis for measuring the dimensions of the stator blade, and the positioning reference X-axis coincides with one of the positioning surfaces.

3. The aeroengine blade size measurement system according to claim 1, wherein: It further includes a base, and the blade mounting base, the dial indicator seat, and the support are all arranged on the base. A dial indicator slider is slidably arranged inside the dial indicator seat. A positioning cylinder is arranged outside the dial indicator. The positioning cylinder is detachably arranged inside the dial indicator slider. A first screw is arranged at the upper end of the dial indicator slider, and an adjusting nut is rotatably arranged at the upper end of the dial indicator seat. The first screw is in threaded connection with the adjusting nut. A translation table is slidably arranged inside the support. A second screw is arranged at the upper end of the translation table, and an adjusting nut is rotatably arranged at the upper end of the support. The second screw is in threaded connection with the adjusting nut. A sliding column is arranged at one end of the measuring block, and the sliding column is slidably arranged inside the translation table. An adjusting handle is threadedly connected to the outer section of the sliding column.

4. The aero-engine blade size measurement system according to claim 3, characterized in that: There are two translation tables. Slide rods are respectively arranged vertically on both sides of the support. The translation tables are slidably arranged on the slide rods. A connecting block is arranged at the bottom end of the second screw, and the two slide rods are connected through the connecting block. A through groove is arranged inside the support, and the connecting block is slidably arranged in the through groove.

5. The aeroengine blade size measurement system according to claim 4, characterized in that: A number of positioning holes for positioning the profile of the stator blade are vertically arranged on both sides of the through groove. Pin holes are arranged on both sides of the translation table. After the pin holes are aligned with the positioning holes, limit pins are inserted for fixation.

6. The aeroengine blade size measurement system according to claim 4, characterized in that: A compression spring is arranged on the sliding column between the measuring block and the translation table.

7. The aero-engine blade size measurement system according to claim 3, characterized in that: The measuring rod extends out of the positioning cylinder, and a flat measuring head is arranged at the end of the measuring rod.

8. The aero-engine blade size measurement system according to claim 3, characterized in that: The positioning cylinder includes a cylinder body with different outer diameters at both ends. A clip is arranged inside the dial indicator slider. The cylinder body with a smaller diameter at one end of the positioning cylinder is arranged inside the clip, and a locking screw for pressing the clip tightly is arranged on the dial indicator slider.

9. The aeroengine blade size measurement system according to claim 2, wherein: A first installation groove is formed on the blade mounting base, and a positioning hole is arranged inside the first installation groove. The journal is arranged inside the positioning hole. The fixture includes two clamping blocks that are slidably arranged relative to each other in the first installation groove, and the clamping blocks move towards each other to clamp the journal.

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