A device and method for measuring the height of a turbine disk blade root slot after creep

Abstract

The application discloses a kind of turbine wheel disc root groove creeps after height measuring device and method, turbine wheel disc root groove creeps after height measuring device includes: positioning structure, positioning structure includes positioning piece and at least three diameters same positioning beads, at least three positioning beads are suitable for being arranged into the opposite two first level tenon tooth grooves in same root groove, positioning bead and the diameter of first level tenon tooth groove are same, the middle part of positioning piece is formed with the measuring datum plane that is perpendicular to the height direction of root groove and is away from first level tenon tooth groove, and through hole is set on measuring datum plane;When positioning bead is placed in corresponding first level tenon tooth groove, positioning piece is placed on at least three positioning beads, the center of positioning bead is located on the plane where measuring datum plane is located;Measuring tool, measuring tool includes measuring rod, and the head of measuring rod is suitable for passing through through hole and reaching the groove bottom of root groove.The center of first level tenon tooth groove is transferred to measuring datum plane by positioning bead, and the measurement accuracy can be improved.

Description

Technical Field

[0001] This invention relates to the field of blade root groove creep height measurement technology, specifically to a device and method for measuring the creep height of a gas turbine disk blade root groove. Background Technology

[0002] The turbine disk is one of the core components of a gas turbine. Multiple blade root grooves are spaced apart along the outer circumference of the turbine disk, machined inwards from the outer circumference. The blade roots of the turbine blades mate with these grooves to assemble the blades onto the turbine disk. The blade root grooves are typically fir-tree shaped and are subjected to high temperatures and stresses during operation. With increasing service life, these grooves undergo creep deformation. Excessive creep deformation can lead to creep fracture of the turbine disk, resulting in catastrophic consequences for the unit. Therefore, it is essential to regularly monitor the height of the blade root grooves on the turbine disks of in-service gas turbines.

[0003] The monitoring of turbine disk blade root groove height is typically conducted concurrently with gas turbine overhauls. For example... Figure 1 As shown, the existing monitoring method is to directly measure the distance between the circumferential surface of the turbine disk on both sides of the blade root groove and the bottom of the blade root groove using a depth vernier caliper or depth micrometer, and use this distance as the height value of the blade root groove after creep.

[0004] However, existing methods for monitoring turbine blade root groove height have the following shortcomings: 1) The circumferential surfaces on both sides of the blade root groove are not regular surfaces and have various shape characteristics. Furthermore, these circumferential surfaces are easily bumped and worn by foreign objects during disassembly or maintenance of turbine blades, resulting in uneven surfaces. Using uneven circumferential surfaces as measurement reference points will result in a relatively large error. 2) The circumferential surfaces on both sides of the blade root groove are not the points that directly interact with the tenons on the blade root of the turbine blade. Therefore, the height value of the blade root groove after creep deformation measured with the circumferential surface as a reference has a relatively large error compared with the actual height value of the blade root groove after creep deformation caused by the tenons. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the height value of the blade root groove after creep deformation measured by using a depth micrometer or depth vernier caliper with the circumferential surface as a reference has a large error. Thus, the present invention provides a device and method for measuring the height of the blade root groove after creep of a gas turbine disk.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A device for measuring the creep height of a gas turbine disk blade root groove, the measuring device comprising: A positioning structure includes a positioning element and at least three positioning beads of the same diameter. The at least three positioning beads are adapted to be respectively positioned into two opposing first-level tenon grooves within the same leaf root groove. The positioning beads and the first-level tenon grooves have the same diameter. A measuring reference surface is formed in the middle of the positioning element, facing away from the first-level tenon groove and perpendicular to the height direction of the leaf root groove. A through hole is provided on the measuring reference surface. When the positioning bead is placed in the corresponding first-level tenon groove and the positioning element is placed on at least three positioning beads, the center of the positioning bead is located on the plane where the measuring reference surface is located. The first-level tenon groove is the tenon groove farthest from the bottom of the leaf root groove. A measuring tool, the measuring tool including a measuring rod, the head of the measuring rod being adapted to pass through the through hole to reach the bottom of the blade root groove.

[0007] Furthermore, the two ends of the positioning member are respectively formed with receiving structures that open toward the first-stage tenon groove, and the receiving structures are used to receive the positioning bead.

[0008] Furthermore, the receiving structure is an arc-shaped notch, and the diameter of the arc-shaped notch is the same as the diameter of the positioning bead, and the positioning bead is in line contact with the arc-shaped notch.

[0009] Furthermore, a groove is provided in the middle of the positioning component, and the measuring reference surface is the upper surface of the bottom wall of the groove.

[0010] Furthermore, the measuring tool also includes a measuring anvil, which is mounted on the upper surface of the bottom wall of the groove, and the measuring rod is telescopically mounted on the measuring anvil along the height direction of the leaf root groove.

[0011] Furthermore, the positioning structure also includes a limiting member and a connecting member. One end of the connecting member is fixedly connected to the side of the positioning member facing the limiting member, and the other end is connected to the limiting member. During measurement, the limiting member is adapted to abut against the end face of the turbine disk where the blade root groove is located.

[0012] Furthermore, the connector is slidably mounted on the limiting member, so that the distance between the positioning member and the limiting member in the length extension direction of the connector is adjustable.

[0013] Furthermore, the connector is provided with an indicator to ensure that the distance between the positioning member and the limiting member is a preset distance.

[0014] Furthermore, it also includes a temperature monitor, which is connected to the turbine disk and the positioning structure respectively, to monitor the temperature of the turbine disk and the positioning structure to ensure that the temperature of the turbine disk and the positioning structure is the same during measurement.

[0015] The technical solution of this invention has the following advantages: 1. This invention provides a device for measuring the creep height of a gas turbine disk blade root groove, comprising a positioning structure and a measuring tool. The positioning structure includes a positioning element and at least three positioning beads of the same diameter. The at least three positioning beads are adapted to be respectively positioned into two opposing first-stage tenon grooves within the same blade root groove. The positioning beads and the first-stage tenon grooves have the same diameter. A measuring reference surface is formed in the middle of the positioning element, facing away from the first-stage tenon groove and perpendicular to the height direction of the blade root groove. A through hole is provided on the measuring reference surface. When the positioning beads are placed in the corresponding first-stage tenon groove and the positioning element is placed on the at least three positioning beads, the center of the positioning beads is located on the measuring reference surface. In this way, the center of the first-stage tenon groove can be transferred to the measuring reference surface through the positioning beads. On the reference surface, the high flatness of the measurement reference surface improves measurement accuracy. Furthermore, since the positioning component is mounted on the two first-stage tenon grooves via positioning beads, rather than on the corresponding circumferential surfaces on both sides of the blade root groove, and the first-stage tenon grooves are located on the inner side of the circumferential surface, they are less likely to be bumped or scratched and deformed during blade disassembly or maintenance. Moreover, the shape of the first-stage tenon grooves is stable along their length extension direction, thus avoiding measurement errors caused by different surface shapes at different measurement positions, further improving measurement accuracy. In addition, since the first-stage tenon grooves are the area directly affected by the blade root of the turbine blade, the data measured by mounting the positioning component on the two first-stage tenon grooves via positioning beads is closer to the actual data.

[0016] 2. The present invention provides a device for measuring the creep height of the root groove of a gas turbine disk blade. The two ends of the positioning component are respectively formed with receiving structures with openings facing the first-stage tenon groove. The receiving structures are used to accommodate the positioning bead. In this way, the contact between the positioning component and the positioning bead will be more stable, reducing the measurement error caused by the shaking of the positioning structure.

[0017] 3. The present invention provides a device for measuring the height of the root groove of a gas turbine disk after creep. The receiving structure is an arc-shaped notch, and the diameter of the arc-shaped notch is the same as the diameter of the positioning bead. The positioning bead is in line contact with the arc-shaped notch. In this way, the stability of the positioning plate can be further improved, thereby further improving the stability of the measuring device and reducing the measurement error caused by the shaking of the measuring device.

[0018] 4. The present invention provides a device for measuring the creep height of the root groove of a gas turbine disk blade. The connecting part is slidably mounted on the limiting part, so that the distance between the positioning part and the limiting part in the length extension direction of the first-stage tenon groove is adjustable. In this way, multiple target positions can be selected on the first-stage tenon groove for measurement according to actual needs.

[0019] 5. The present invention provides a device for measuring the creep height of the root groove of a gas turbine disk blade. The sliding part is marked with an indicator to ensure that the distance between the positioning part and the limiting part is a preset distance. In this way, the measurement error caused by the uncertainty of the measurement position can be reduced and the measurement accuracy can be improved. It can not only facilitate measurement by different personnel, but also improve the comparability of measurement data.

[0020] 6. The device for measuring the creep height of the turbine disk blade root groove provided by the present invention further includes a temperature monitor, which is connected to the turbine disk and the positioning structure respectively, to monitor the temperature of the turbine disk and the positioning structure, so as to ensure that the temperature of the turbine disk and the positioning structure is the same during measurement. In this way, the measurement error caused by the different degree of thermal expansion and contraction due to the different temperatures of the turbine disk and the positioning structure can be avoided.

[0021] A method for measuring the creep height of the root groove of a gas turbine disk blade includes the following steps: S1. Distribute at least three positioning beads with the same diameter as the first-level tenon groove into two opposite first-level tenon grooves in the same leaf root groove, wherein the center of the positioning beads and the center of the first-level tenon groove coincide. S2. Place the positioning element on at least three of the positioning beads, such that the centers of the at least three positioning beads are all located in the plane of the measurement reference surface on the positioning element; S3. Extend the head of the measuring tool through the through hole on the measuring reference surface to the bottom of the blade root groove; S4. Read the value on the measuring rod.

[0022] Furthermore, prior to step S3, the following steps are also included: The limiting component abuts against the end face of the turbine disk where the blade root groove is located, ensuring that the distance between the positioning component and the limiting component is the preset distance; The temperature of the turbine disk and the positioning structure is monitored by a temperature monitor to ensure that the temperature of the turbine disk and the positioning structure is the same.

[0023] 1. The present invention provides a method for measuring the creep height of a gas turbine disk blade root groove, comprising the following steps: distributing at least three positioning beads with the same diameter as the first-stage tenon groove into two opposing first-stage tenon grooves within the same blade root groove, with the centers of the positioning beads and the first-stage tenon grooves coinciding; placing a positioning element on the at least three positioning beads, such that the centers of the at least three positioning beads are located in the plane of the measurement reference surface on the positioning element; extending the head of the measuring tool's probe through a through hole in the measurement reference surface to the bottom of the blade root groove; and reading the value on the measuring rod. In this way, the centers of the first-stage tenon grooves can be transferred at least on the measurement reference surface via the positioning beads. This improves measurement accuracy. Furthermore, since the positioning component is mounted on the two first-level tenon grooves via positioning beads, rather than on the corresponding circumferential surfaces on both sides of the blade root groove, and the first-level tenon grooves are located on the inner side of the circumferential surface, they are less likely to be bumped or scratched and deformed during blade disassembly or maintenance. Moreover, the shape of the first-level tenon grooves is stable along their length extension direction, thus avoiding measurement errors caused by different surface shapes at different measurement positions, further improving measurement accuracy. In addition, since the first-level tenon grooves are the area directly affected by the blade root of the turbine blade, the data measured by mounting the positioning component on the two first-level tenon grooves via positioning beads is closer to the actual data.

[0024] 2. The present invention provides a method for measuring the creep height of the blade root groove of a gas turbine disk. The limiting component abuts against the end face of the turbine disk where the blade root groove is located, ensuring that the distance between the positioning component and the limiting component is a preset distance. In this way, the measurement error caused by the uncertainty of the measurement position can be reduced, the measurement accuracy can be improved, and it can be convenient for different personnel to perform the measurement, and the comparability of the measurement data can also be improved.

[0025] 3. The present invention provides a method for measuring the height of the root groove of a gas turbine disk after creep. A temperature monitor is used to monitor the temperature of the turbine disk and the positioning structure to ensure that the temperature of the turbine disk and the positioning structure is the same. In this way, the measurement error caused by the different degrees of thermal expansion and contraction due to the different temperatures of the turbine disk and the positioning structure can be avoided. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a prior art device for measuring the height of the root groove of a gas turbine disk blade after creep. Figure 2This is a three-dimensional structural schematic diagram of a device for measuring the height of a gas turbine disk blade root groove after creep, according to the present invention. Figure 3 This is a schematic diagram of a device for measuring the creep height of a gas turbine disk blade root groove according to the present invention, which is used in conjunction with the blade root groove for measurement. Figure 4 This is a front view of a device for measuring the height of a gas turbine disk blade root groove after creep, according to the present invention.

[0028] Explanation of reference numerals in the attached figures: 11. Turbine wheel; 111. Circumferential surface; 112. End face; 13. Leaf root groove; 131. First-stage tenon groove; 21. Positioning component; 211. Receiving structure; 212. Groove; 22. Positioning bead; 23. Limiting component; 24. Connecting component; 25. Temperature monitor; 31. Measuring rod; 32. Measuring anvil; 33. Ratchet. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1 like Figures 2 to 4 As shown, this embodiment provides a device for measuring the height of the root groove of a gas turbine disk blade after creep, including a positioning structure and a measuring device.

[0034] The turbine disk 11 usually has multiple blade root grooves 13 extending inward from the circumferential surface 111. The blade root grooves 13 are provided with multi-level tenon grooves, making the blade root grooves 13 resemble an inverted fir tree. For ease of explanation later, the tenon groove farthest from the bottom of the blade root groove 13 is defined as the first-level tenon groove 131.

[0035] The positioning member 21 has a measuring reference surface facing away from the leaf root groove 13 and perpendicular to the height direction of the leaf root groove. In this embodiment, the measuring reference surface is the upper surface of the bottom wall of the groove 212 in the middle of the positioning member 21, and a through hole (not shown) is formed on the measuring reference surface. Receiving structures 211 are formed at both ends of the positioning member 21 to receive the positioning beads 22. In this embodiment, the receiving structure 211 is an arc-shaped notch, and the arc-shaped notch is along the width direction of the positioning member 21 (e.g., ...). Figure 2 Extending in the direction indicated by the middle arrow, the positioning bead 22 can contact the corresponding arc-shaped notch at any position without repeatedly adjusting the position of the positioning bead 22 or the positioning element 21, thus saving time in adjusting the positioning structure and improving measurement efficiency. The diameter of the arc-shaped notch is the same as the diameter of the positioning bead 22, and the positioning bead 22 forms a line contact with the arc-shaped notch. There are many ways to achieve the line contact between the positioning bead 22 and the arc-shaped notch. In this embodiment, the arc-shaped notch is a quarter-circle arc. Of course, the arc-shaped notch can also be a semi-circle arc, or something between a quarter-circle arc and a semi-circle arc. In this way, it will not prevent the positioning bead 22 from entering the arc-shaped notch, and the arc-shaped notch can also have a contact point with the positioning bead 22 in the vertical direction. When the positioning element 21 presses against the positioning bead 22, the positioning bead 22 will not roll. Furthermore, since there is a line contact between the positioning bead 22 and the arc-shaped notch, the contact is more stable, which can improve the stability of the positioning structure and reduce the measurement error caused by the shaking of the positioning structure. Of course, the receiving structure 211 can also be other shapes. For example, the receiving structure 211 can be multiple receiving grooves spaced apart along the width direction of the positioning member 21, or the receiving structure 211 can be a space surrounded by several protrusions. The shape of the receiving structure 211 is not specifically limited here, and can be set according to actual needs.

[0036] At least three positioning beads 22 have the same diameter. In this embodiment, there are three positioning beads 22, which are distributed into two first-level tenon grooves 131. That is, one positioning bead 22 is placed in one first-level tenon groove 131 and two positioning beads 22 are placed in the other first-level tenon groove 131. In this way, the three positioning beads 22 can provide stable support for the positioning member 21 in three positions, and the number of positioning beads 22 can be kept to a minimum, thereby reducing costs. The diameter of the positioning bead 22 is the same as the diameter of the first-stage tenon groove 131. When the positioning bead 22 is placed into the first-stage tenon groove 131, the center of the positioning bead 22 coincides with that of the first-stage tenon groove 131, and the positioning bead 22 will make line contact with the first-stage tenon groove 131. In this way, on the one hand, the measurement error caused by surface shape changes due to foreign objects or corrosion and rust on the surface of the blade root groove 13 can be avoided to the greatest extent. On the other hand, the contact between the positioning bead 22 and the first-stage tenon groove 131 is more stable, thereby improving the stability of the entire measuring device. It also greatly simplifies the placement and adjustment steps of the positioning structure, ultimately improving the measurement accuracy and efficiency. In addition, when the positioning component 21 is placed on the positioning bead 22, the center of the positioning bead 22 is located on the plane of the measurement reference surface. In this way, the center of the first-stage tenon groove 131 can be transferred to the measurement reference surface on the positioning component 21 through the positioning bead 22. The measurement reference surface can have a high degree of flatness. Therefore, the result measured with the measurement reference surface as the reference is more accurate. In addition, in this embodiment, the positioning bead 22 has the same diameter as the arc-shaped notch, which can more accurately transfer the center of the first-level tenon groove 131 to the measurement reference surface through the positioning bead 22 and the arc-shaped notch.

[0037] The measuring tool includes an anvil 32, a measuring rod 31, and a ratchet 33 connected to the tail of the measuring rod 31. The anvil 32 is placed on the measuring reference surface. The measuring rod 31 is telescopically mounted on the anvil 32 in the direction of the blade root groove height. Rotating the ratchet 33 drives the head of the measuring rod 31 to telescopically move within the blade root groove 13. During measurement, the head of the measuring rod 31 can pass through a through-hole on the measuring reference surface to reach the bottom of the blade root groove 13. In this embodiment, the measuring tool is a depth micrometer or a depth vernier caliper. To facilitate direct reading of the creep height value of the blade root groove 13, the O-mark on the measuring rod 31 is flush with the measuring reference surface.

[0038] The number of connecting parts 24 is one. Of course, the number of connecting parts 24 can also be other values, which can be set according to actual needs, and no specific limitation is made here. In this embodiment, the positioning part 21 and the limiting part 23 are arranged in parallel. One end of the connecting part 24 is fixedly connected to the side of the positioning part 21 facing the limiting part 23, and the other end is connected to the limiting part 23. During measurement, the limiting part 23 is adapted to abut against the end face 112 of the turbine disk 11 where the blade root groove 13 is located, so that the distance between the positioning part 21 and the limiting part 23 is a preset distance. In this way, the measurement error caused by the uncertainty of the measurement position can be reduced, the measurement accuracy can be improved, and it can be convenient for different people to perform the measurement, and the comparability of the measurement data can also be improved. Here, the end face 112 of the turbine disk 11 is the outer side surface of the turbine disk 11 that is perpendicular to the length extension direction of the first-stage tenon groove 131.

[0039] In one implementation, the connector 24 is fixedly connected to the limiting member 23, and the preset distance between the limiting member 23 and the positioning member 21 is not adjustable, so that the distance between the positioning member 21 and the end face 112 of the turbine wheel 11 is fixed each time the measurement is performed, that is, the measurement position is fixed each time the measurement is performed.

[0040] In another embodiment, the connecting member 24 is slidably connected to the limiting member 23. In this embodiment, the limiting member 23 is hollow and has a through hole. The end of the connecting member 24 away from the positioning member 21 passes through the through hole and is slidably mounted on the limiting member 23. The sliding of the connecting member 24 on the limiting member 23 will drive the positioning member 21 to move, thereby changing the distance between the positioning member 21 and the limiting member 23 in the length extension direction of the first-stage tenon groove 131. The connecting member 24 is marked to ensure that the distance between the positioning member 21 and the limiting member 23 is a preset distance. This reduces measurement errors caused by uncertainty in the measurement position, improves measurement accuracy, facilitates measurement by different personnel, and enhances the comparability of measurement data. Specifically, when the mark is aligned with the outer side of the limiting member 23 facing the positioning member 21, it can be determined that the distance between the positioning member 21 and the limiting member 23 meets the requirements. Alternatively, when the mark is aligned with the outer side of the limiting member 23 facing away from the positioning member 21, it can be determined that the distance between the positioning member 21 and the limiting member 23 meets the requirements. Here, the outer side refers to the side of the limiting member 23 that is perpendicular to the length extension direction of the connecting member 24.

[0041] Temperature monitor 25 is used to ensure that the temperature of the turbine disk 11 where the blade root slot 13 is located is the same as the temperature of the positioning structure. In this embodiment, temperature monitor 25 includes two probes and a display. During measurement, one probe is attached to the turbine disk 11 and the other probe is attached to the positioning structure. Of course, the probes can also be inserted into both the turbine disk 11 and the positioning structure; no specific limitation is made here. The probes are thermocouples, and the display is a bridge design. When the temperature of the turbine disk 11 and the positioning structure is the same, the display of temperature monitor 25 shows a green light; when the temperature of the turbine disk 11 and the positioning structure is different, the display shows a red light. Starting measurement when the display shows a green light provides higher accuracy than starting measurement when the display shows a red light, because starting measurement when the display shows a green light avoids measurement errors caused by the different degrees of thermal expansion and contraction due to the temperature difference between the turbine disk 11 where the blade root slot 13 is located and the positioning structure.

[0042] In this embodiment, the positioning bead 22 is placed into the first-stage tenon groove 131, and the positioning member 21 is placed on the positioning bead 22. The center of the positioning bead 22 is located on the plane of the measurement reference surface. Since the diameter of the positioning bead 22 is the same as that of the first-stage tenon groove 131, the centers of the positioning bead 22 and the first-stage tenon groove 131 coincide. In this way, the center of the first-stage tenon groove 131 can be transferred to the measurement reference surface through the positioning bead 22. Since the measurement reference surface can have a high degree of flatness, the measurement accuracy can be improved. Furthermore, since the positioning member 21 is supported by the positioning bead 22 on the two first-stage tenons... The tooth groove 131 is not mounted on the corresponding circumferential surfaces on both sides of the blade root groove 13. Instead, the first-level tenon tooth groove 131 is located on the inner side of the circumferential surface. It is not easily bumped or scratched and deformed during blade disassembly or maintenance. Furthermore, the shape of the first-level tenon tooth groove 131 is stable along its length extension direction. Therefore, it can avoid measurement errors caused by different surface shapes at different measurement positions, thereby further improving measurement accuracy. In addition, as the area where the blade root of the turbine blade directly acts, the first-level tenon tooth groove 131 is used. By mounting the positioning member 21 on the two first-level tenon tooth grooves 131 through the positioning bead 22, the measured data is closer to the actual data.

[0043] Example 2 like Figures 2 to 4 As shown, this embodiment provides a method for measuring the height of the root groove of a gas turbine disk blade after creep. The measuring device used is the measuring device in Embodiment 1, and includes the following steps: S1. At least three positioning beads 22 with the same diameter as the first-level tenon groove 131 are distributed and placed in two opposing first-level tenon grooves 131 within the same blade root groove 13. The centers of the first-level tenon grooves 131 and the positioning beads 22 coincide, and the positioning beads 22 form line contact with the first-level tenon grooves 131. In this way, on the one hand, the measurement error caused by surface shape changes due to foreign objects or corrosion and rust on the surface of the blade root groove 13 can be avoided to the greatest extent. On the other hand, the contact between the positioning beads 22 and the first-level tenon grooves 131 is more stable, thereby improving the stability of the entire measuring device. It also greatly simplifies the placement and adjustment steps of the positioning structure, and ultimately improves the measurement accuracy and measurement efficiency. In this embodiment, the number of positioning beads 22 is three; the first-level tenon groove 131 is the tenon groove farthest from the bottom of the groove within the blade root groove 13. S2. Place the positioning element 21 on at least three positioning beads 22, ensuring that the centers of the positioning beads 22 are all located on the plane of the measurement reference surface of the positioning element 21. This allows the center of the first-stage tenon groove 131 to be transferred to the measurement reference surface via the positioning beads 22, thereby improving measurement accuracy. When there are three positioning beads 22, they provide stable support to the positioning element 21 at three different positions. Specifically, the three positioning beads 22 are inserted into the receiving structures 211 at both ends of the positioning element 21. This improves the contact stability between the positioning element 21 and the positioning beads 22, further enhancing the stability of the measuring device and avoiding measurement errors caused by device shaking. The shape of the receiving structure 211 and... The advantages are the same as in Embodiment 1, and will not be repeated here. In this embodiment, since the positioning member 21 is mounted on the two first-level tenon grooves 131 by the positioning beads 22, and is not mounted on the corresponding circumferential surfaces on both sides of the blade root groove 13, and the first-level tenon grooves 131 are located on the inner side of the circumferential surface, they are not easily bumped or scratched and deformed when disassembling or repairing the blade. In addition, the shape of the first-level tenon grooves 131 is stable along its length extension direction, so the measurement error caused by the different surface shapes at different measurement positions can be avoided, which further improves the measurement accuracy. In addition, the first-level tenon grooves 131 are the area directly affected by the blade root of the turbine blade. The data measured by mounting the positioning member 21 on the two first-level tenon grooves 131 by the positioning beads 22 is closer to the actual data. S3. Press the positioning part 21 towards the bottom of the leaf root groove 13, and rotate the ratchet 33 of the measuring tool so that the head of the measuring rod 31 passes through the through hole on the positioning part 21 and extends to the bottom of the leaf root groove 13. S4. Read and record the values ​​on the measuring rod 31. When the O scale line on the measuring rod 31 is aligned with the measurement reference surface, the value on the measuring rod 31 can be directly read as the height measurement value of the blade root groove 13 after creep. The measurement efficiency is high. If the O scale line on the measuring rod 31 is offset from the measurement reference surface, it needs to be corrected accordingly. S5. Repeat steps S1-S4 three times, and take the average of the three measured height values ​​after creep of the blade root groove as the final height measurement value after creep of the blade root groove; the three measurements can be for the same position on the same blade root groove 13, or for three positions on the same blade root groove 13.

[0044] Of course, before proceeding to step S3, the following steps can also be performed: The limiting member 23 abuts against the end face 112 of the turbine wheel 11 to ensure that the distance between the positioning member 21 and the limiting member 23 is the preset distance. In this way, the measurement error caused by the uncertainty of the measurement position can be reduced and the measurement accuracy can be improved. This not only makes it convenient for different people to perform measurements, but also improves the comparability of measurement data. The temperature monitor is connected to the turbine disk 11 and the positioning structure respectively to ensure that the temperature of the turbine disk 11 and the positioning structure is the same, so as to avoid measurement errors caused by the different degrees of thermal expansion and contraction due to the temperature difference between the turbine disk 11 where the blade root groove 13 is located and the positioning structure, thereby improving the measurement accuracy. The structure and usage of the temperature monitor are the same as in Example 1, and will not be described again here.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for measuring the height of the root groove of a gas turbine disk blade after creep, characterized in that, The measuring device includes: The positioning structure includes a positioning element (21) and at least three positioning beads (22) of the same diameter. The at least three positioning beads (22) are adapted to be respectively placed in two opposing first-level tenon grooves (131) in the same leaf root groove (13). The positioning beads (22) and the first-level tenon grooves (131) have the same diameter. A measuring reference surface is formed in the middle of the positioning element (21) facing away from the first-level tenon groove (131) and perpendicular to the height direction of the leaf root groove. A through hole is opened on the measuring reference surface. When the positioning bead (22) is placed in the corresponding first-level tenon groove (131) and the positioning element (21) is placed on at least three positioning beads (22), the center of the positioning bead (22) is located on the plane where the measuring reference surface is located. The first-level tenon groove (131) is the tenon groove farthest from the bottom of the leaf root groove (13). The measuring tool includes a measuring rod (31), the head of which is adapted to pass through the through hole to reach the bottom of the blade root groove (13); The positioning member (21) has a receiving structure (211) with an opening facing the first-stage tenon groove (131) at both ends. The receiving structure (211) is used to receive the positioning bead (22). The receiving structure (211) is an arc-shaped notch, and the diameter of the arc-shaped notch is the same as the diameter of the positioning bead (22), and the positioning bead (22) is in contact with the arc-shaped notch line.

2. The device for measuring the height of the root groove of a gas turbine disk blade after creep according to claim 1, characterized in that, The positioning component (21) has a groove (212) in the middle, and the measurement reference surface is the upper surface of the bottom wall of the groove (212).

3. The device for measuring the height of the root groove of a gas turbine disk blade after creep according to claim 2, characterized in that, The measuring tool also includes an anvil (32), which is placed on the upper surface of the bottom wall of the groove (212), and the measuring rod (31) is telescopically mounted on the anvil (32) along the height direction of the leaf root groove.

4. A device for measuring the creep height of a gas turbine disk blade root groove according to any one of claims 1-3, characterized in that, The positioning structure also includes a limiting member (23) and a connecting member (24). One end of the connecting member (24) is fixedly connected to the side of the positioning member (21) facing the limiting member (23), and the other end is connected to the limiting member (23). During measurement, the limiting member (23) is adapted to abut against the end face (112) of the turbine disk (11) where the blade root groove (13) is located.

5. The device for measuring the height of the root groove of a gas turbine disk blade after creep according to claim 4, characterized in that, The connector (24) is slidably mounted on the limiting member (23), so that the distance between the positioning member (21) and the limiting member (23) in the length extension direction of the connector (24) is adjustable.

6. The device for measuring the height of the root groove of a gas turbine disk blade after creep according to claim 5, characterized in that, The connector (24) is marked to ensure that the distance between the positioning member (21) and the limiting member (23) is a preset distance.

7. The device for measuring the height of the root groove of a gas turbine disk blade after creep according to claim 6, characterized in that, It also includes a temperature monitor (25), which is connected to the turbine disk (11) and the positioning structure respectively, to monitor the temperature of the turbine disk (11) and the positioning structure to ensure that the temperature of the turbine disk (11) and the positioning structure is the same during measurement.

8. A method for measuring the creep height of the root groove of a gas turbine disk blade, characterized in that, The device for measuring the creep height of the root groove of a gas turbine disk blade as described in claim 7 includes the following steps: S1. Distribute at least three positioning beads (22) with the same diameter as the first-level tenon groove (131) into two opposing first-level tenon grooves (131) in the same leaf root groove (13), with the center of the positioning beads (22) and the center of the first-level tenon groove (131) coinciding. S2. Place the positioning element (21) on at least three positioning beads (22) such that the centers of the at least three positioning beads (22) are all located in the plane of the measurement reference plane on the positioning element (21); S3. The head of the measuring tool's measuring rod (31) is passed through the through hole on the measuring reference surface and extended to the bottom of the blade root groove (13); S4. Read the value on the measuring rod (31).

9. A method for measuring the creep height of the root groove of a gas turbine disk blade according to claim 8, characterized in that, Before step S3, the following steps are also included: The limiting member (23) abuts against the end face (112) of the turbine disk (11) where the blade root groove (13) is located, ensuring that the distance between the positioning member (21) and the limiting member (23) is a preset distance; The temperature of the turbine disk (11) and the positioning structure is monitored by a temperature monitor (25) to ensure that the temperature of the turbine disk (11) and the positioning structure is the same.

Images