A turbine disk blade root groove height measuring device and measuring method

Abstract

This invention discloses a device and method for measuring the height of a turbine disk blade root groove. The measuring device includes: a support structure comprising a first support rod and a second support rod of the same diameter that are movably connected together. Both ends of the first and second support rods are connected to spheres of the same diameter. The axes of the first and second support rods pass through the centers of the corresponding spheres. The first and second support rods are adapted to rest on two opposing primary tenon grooves on the blade root groove at a first initial angle and a second initial angle, respectively, along the width direction of the blade root groove. The first and second initial angles are reduced to a first final angle and a second final angle, respectively, so that the center of the sphere coincides with the center of the corresponding primary tenon groove. A measuring tool includes a measuring anvil and a telescopically mounted measuring rod on the measuring anvil. At the first and second final angles, the measuring anvil rests on the first and second support rods. The measurement results are more accurate.

Description

Technical Field

[0001] This invention relates to the field of blade root groove height measurement technology, specifically to a turbine disk blade root groove height measuring device and measurement method. 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 existing monitoring of turbine blade root groove height is usually carried out concurrently with gas turbine overhaul. The current 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 take this distance as the blade root groove height value.

[0004] However, existing methods for monitoring turbine blade root groove height have the following shortcomings:

[0005] 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 surfaces will result in relatively large errors.

[0006] 2) The circumferential surfaces on both sides of the blade root groove are not the points that directly interact with the blade root of the turbine blade. Therefore, the blade root groove height value measured using the circumferential surface as the measurement reference surface has a relatively large error compared with the actual blade root groove height value.

[0007] In view of the above shortcomings, it is necessary to design a turbine disk blade root groove height measuring device and measurement method. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is that the blade root groove height value measured by using a depth micrometer or depth vernier caliper with the circumferential surface as the measurement reference surface has a large error, thereby providing a turbine disk blade root groove height measuring device and measuring method.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0010] A turbine disk blade root groove height measuring device, the measuring device comprising:

[0011] The support structure includes a first support rod and a second support rod of the same diameter that are movably connected together. Both ends of the first support rod and the second support rod are connected to spheres of the same diameter. The axes of the first support rod and the second support rod pass through the centers of the corresponding two spheres. The first support rod and the second support rod are adapted to rest on two primary tenon grooves opposite each other on the leaf root groove at a first initial angle and a second initial angle, respectively, in the width direction of the leaf root groove. The first initial angle and the second initial angle are reduced to a first final angle and a second final angle, respectively, so that the center of the sphere coincides with the center of the corresponding primary tenon groove. The primary tenon groove is the tenon groove farthest from the bottom of the leaf root groove.

[0012] The measuring tool includes an anvil and a telescopically mounted measuring rod on the anvil. At the first final angle and the second final angle, the anvil is mounted on the first support rod and the second support rod.

[0013] Furthermore, the measuring device also includes a connector located on one side of the anvil, which is movably connected to the first support rod and the second support rod at two different positions along its length.

[0014] Furthermore, each end of the connector is provided with a collar, and the first support rod and the second support rod are respectively provided with a sleeve rod, and the collar is fitted onto the corresponding sleeve rod with a gap.

[0015] Furthermore, one end of the first support rod and one end of the second support rod are movably connected to the same sphere.

[0016] Furthermore, it also includes an elastic element, the two ends of which are respectively connected to the first support rod and the second support rod, and the elastic element and the connecting element are respectively located on two opposite sides of the anvil.

[0017] Furthermore, the elastic element is mounted on the side of the first support rod and the second support rod facing away from the bottom of the groove.

[0018] Furthermore, the elastic element is detachably connected to the first support rod and the second support rod, respectively.

[0019] The technical solution of this invention has the following advantages:

[0020] 1. The present invention provides a turbine disk blade root groove height measuring device. Because the first and second support rods are movably connected together, and the spheres connected to the first and second support rods have the same diameter, during the process of the angle between the first support rod and the blade root groove width direction decreasing from a first initial angle to a first final angle, and the angle between the second support rod and the blade root groove width direction decreasing from a second initial angle to a second final angle, the effective lengths of the first and second support rods in the blade root groove width direction increase. The sphere gradually presses against the sidewall of the first-stage tenon groove, eventually aligning the center of the sphere with the center of the corresponding first-stage tenon groove. In this way, the center of the first-stage tenon groove can be adjusted to the first and second support rods via the sphere. Since the first-stage tenon groove is located inside the circumference of the turbine disk, it is less prone to deformation due to bumps or scratches during blade disassembly or maintenance. Furthermore, the shape of the first-stage tenon groove is stable along its length direction. Therefore, the position of the center at different locations along the blade root groove length direction is relatively stable. Also, because the first and second support rods have the same diameter... When the first and second final included angles are reached, the measuring anvil rests on the first and second support rods. When the measuring rod extends into the leaf root groove and abuts against the bottom of the groove for measurement, the plane formed by the first and second support rods constitutes a more accurate measurement reference plane. Therefore, the measurement result of the leaf root groove height is more accurate. Furthermore, since the sphere forms a stable line contact with the leaf root groove, it can reduce measurement errors caused by shaking and measurement errors caused by changes in surface shape due to foreign matter or corrosion on the leaf root groove surface. In addition, since the first and second support rods are movably connected, they can be mounted on the two primary tenon grooves at a suitable included angle relative to the width direction of the leaf root groove. Compared with the design where the included angle between the first and second support rods is fixed, it can avoid the situation where the distance between the two primary tenon grooves becomes smaller due to certain corrosion products on the leaf root groove surface, causing the sphere on the first or second support rod to not smoothly enter the corresponding primary tenon groove, thereby improving the adaptability of the measuring device. Furthermore, since the tenons on the blade root of the turbine blade interact directly with the primary tenon groove, the measurement results obtained by placing the first and second support rods on the two primary tenon grooves are more accurate than those obtained by placing them on the circumferential surface.

[0021] 2. The present invention provides a turbine disk blade root groove height measuring device, the measuring device further includes a connector located on one side of the anvil, the connector being movably connected to a first support rod and a second support rod at two different positions along its length. In this way, on the one hand, it will not interfere with the probe extending into the bottom of the blade root groove, and on the other hand, it can provide a swing fulcrum for the first and second support rods, making it convenient to adjust the angle between the first and second support rods and the width direction of the blade root groove.

[0022] 3. The turbine disk blade root groove height measuring device provided by the present invention further includes an elastic element. The two ends of the elastic element are respectively connected to a first support rod and a second support rod. The elastic element and the connecting element are respectively located on two opposite sides of the measuring anvil. In this way, the angle between the first support rod and the second support rod and the blade root groove width direction can be automatically adjusted by the rebound force of the elastic element. Moreover, the first support rod and the second support rod can be kept taut by the rebound force of the elastic element, thereby ensuring that the angle between the first support rod and the second support rod and the blade root groove width direction remains unchanged during the measurement process, so that the center of the sphere always coincides with the center of the corresponding first-level tenon groove, further improving the measurement accuracy. Furthermore, it eliminates the need to rely on the hand to maintain the angle between the first support rod and the second support rod and the blade root groove width direction, thereby improving the ease of operation.

[0023] 4. The present invention provides a turbine disk blade root groove height measuring device, wherein the elastic element is installed on the side facing away from the groove bottom on the first support rod and the second support rod, so that the expansion and contraction of the elastic element can be easily observed.

[0024] 5. The present invention provides a turbine disk blade root groove height measuring device, wherein the elastic element is detachably connected to the first support rod and the second support rod, so that the elastic element can be removed when not in use for easy storage.

[0025] A method for measuring the root groove height of a turbine disk blade, the method comprising the following steps:

[0026] S1. The first support rod and the second support rod, which are of the same diameter and movably connected, and which form a first initial angle and a second initial angle with the width direction of the leaf root groove respectively, are both placed on two opposing primary tenon grooves on the leaf root groove. The primary tenon groove is the tenon groove farthest from the bottom of the leaf root groove.

[0027] S2. Reduce the first initial included angle and the second initial included angle to the first final included angle and the second final included angle respectively, so that the center of the sphere with the same diameter connected to both ends of the first support rod and both ends of the second support rod coincides with the center of the corresponding first-level tenon groove.

[0028] S3. Place the measuring tool's anvil on the first support rod and the second support rod, and extend the measuring tool's probe into the leaf root groove until it abuts against the bottom of the leaf root groove;

[0029] S4. Read the scale value on the measuring rod.

[0030] Furthermore, in step S1, the springs connected to the first support rod and the second support rod at both ends are in an extended state at the first initial angle and the second initial angle, respectively; in step S2, after the external force is removed, the first initial angle and the second initial angle are reduced to the first final angle and the second final angle by means of the spring's rebound force.

[0031] Further, in step S4, the scale value minus the radius value of the first support rod or the second support rod equals the height value of the blade root groove.

[0032] 1. The present invention provides a method for measuring the height of turbine blade root grooves, which has higher accuracy. In addition, since the first support rod and the second support rod are movably connected together, the first support rod and the second support rod can be mounted on the two primary tenon grooves at a suitable angle relative to the width direction of the blade root groove. Compared with the design of a fixed angle between the first support rod and the second support rod, this avoids the situation where the distance between the two primary tenon grooves becomes smaller due to certain corrosion products on the surface of the blade root groove, which would prevent the ball on the first support rod or the ball on the second support rod from smoothly entering the corresponding primary tenon groove, thereby improving the adaptability of the measuring device.

[0033] 2. The present invention provides a method for measuring the height of a turbine disk blade root groove. At a first initial angle and a second initial angle, springs connected at both ends to a first support rod and a second support rod, respectively, are in an extended state. After the external force is removed, the springs' rebound force reduces the first initial angle and the second initial angle to a first final angle and a second final angle, respectively. This allows the spring force to automatically adjust the angle between the first and second support rods and the width direction of the blade root groove. Furthermore, the spring force keeps the first and second support rods taut throughout the measurement process, ensuring that the angle between the first and second support rods and the width direction of the blade root groove remains constant, so that the center of the sphere always coincides with the center of the corresponding first-order tenon groove. This further improves measurement accuracy and eliminates the need for manual maintenance of the angle between the first and second support rods and the width direction of the blade root groove, thus improving operational convenience. Attached Figure Description

[0034] 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.

[0035] Figure 1This is a schematic diagram of the turbine disk blade root groove height measuring device (measuring tool not shown) of the present invention and the two primary tenon grooves of the blade root groove.

[0036] Figure 2 This is a partially enlarged schematic diagram of the two primary tenon grooves fitting in the blade root groove of a turbine disk blade root groove height measuring device (measuring tool not shown) according to the present invention;

[0037] Figure 3 This is a first-view perspective three-dimensional schematic diagram of a turbine disk blade root groove height measuring device with the measuring tools hidden in the present invention.

[0038] Figure 4 This is a second-view perspective three-dimensional schematic diagram of a turbine disk blade root groove height measuring device with the measuring tools removed in this invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Turbine wheel; 11. Blade root groove; 111. Primary tenon groove; 12. Circumferential surface; 2. Support structure; 21. First support rod; 211. First hanging post; 212. First hook; 22. Second support rod; 221. Second hanging post; 222. Second hook; 23. Sphere; 24. Sleeve rod; 241. Baffle plate; 3. Connector; 31. Collar; 4. Elastic element; 41. Hanging lug. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Example

[0046] like Figures 1 to 4 As shown, this embodiment provides a turbine disk blade root groove height measuring device, which includes a support structure 2, a connector 3, an elastic element 4, and a measuring tool (not shown).

[0047] Leaf root groove length direction as Figure 2 In the A-A direction, the width direction of the blade root groove is as follows: Figure 2 In the B-B direction. The blade root groove 11 is shaped like an inverted fir tree and has multiple levels of tenon grooves. The tenon groove furthest from the bottom of the blade root groove 11 is defined as the first-level tenon groove 111. The shape of the first-level tenon groove 111 is stable along the length of the blade root groove. It should be noted that during measurement, the temperature of the turbine disk 1 may be relatively high, and correspondingly, the temperature of the blade root groove 11 in contact with the measuring device may also be relatively high.

[0048] The support structure 2 includes a first support rod 21 and a second support rod 22 of the same diameter. The diameters of the first support rod 21 and the second support rod 22 need to be calibrated, preferably marked on the measuring device. The first support rod 21 and the second support rod 22 are made of the same material as the turbine disk 1, and the turbine disk 1 is usually made of a material with a relatively small coefficient of thermal expansion. This reduces the measurement error caused by thermal deformation of the first support rod 21 and the second support rod 22 due to the high temperature of the blade root groove 11. Both ends of the first support rod 21 and the second support rod 22 are connected to spheres 23. In this embodiment, the diameters of the spheres 23 need to be the same. The diameter of the sphere 23 can be the same as the diameter of the first-stage tenon groove 111, or it can be slightly larger than the diameter of the first-stage tenon groove 111, to ensure that the center of the sphere 23 coincides with the center of the corresponding first-stage tenon groove 111 and is not easily shaken. The sphere 23 can be integrally formed with the first support rod 21 or the second support rod 22, or it can be connected to the first support rod 21 or the second support rod 22 by adhesive bonding or plug-in connection. In this embodiment, the length of the first support rod 21 and the length of the second support rod 22 are equal, but they can also be unequal. In addition, the first support rod 21 is provided with a first hanging post 211, the axis of which intersects with the axis of the first support rod 21. The second support rod 22 is provided with a second hanging post 221, the axis of which intersects with the axis of the second support rod 22. A first hook 212 is fitted on the first hanging post 211, and a second hook 222 is fitted on the second hanging post 221.

[0049] In this embodiment, the first support rod 21 and the second support rod 22 are spaced apart and are movably connected together by the connector 3. Correspondingly, there are four spheres 23. Each end of the first support rod 21 and each end of the second support rod 22 is connected to an independent sphere 23. The axes of the first support rod 21 and the second support rod 22 pass through the centers of the corresponding two spheres 23. In this embodiment, the first support rod 21 and the second support rod 22 are movably connected to two different positions along the length extension direction of the connector 3. Specifically, in... Figure 3From this perspective, the two ends of the connector 3 are movably connected to the right third of the length of the first support rod 21 and the right third of the length of the second support rod 22, respectively, to avoid affecting the insertion of the measuring tool's probe into the blade root groove 11. Specifically, each end of the connector 3 is provided with a collar 31, and each of the first support rod 21 and the second support rod 22 is provided with a sleeve 24. The collar 31 is fitted onto the corresponding sleeve 24 with a gap. This provides a swing fulcrum for the first support rod 21 and the second support rod 22, facilitating the adjustment of the angle between the first support rod 21 and the second support rod 22 and the width direction of the blade root groove, and also facilitating the carrying of the support structure 2. The free end of the sleeve 24 has a baffle 241 to prevent the collar 31 from falling off the sleeve 24. Of course, the two ends of the connector 3 can also extend beyond the first support rod 21 and the second support rod 22, so that the connection position between the connector 3 and the first support rod 21 and the second support rod 22 is located between the two end faces of the connector 3.

[0050] In another embodiment, the first support rod 21 and the second support rod 22 are movably connected by a sphere 23, forming a V-shape. Accordingly, there are three spheres 23, meaning one end of the first support rod 21 and one end of the second support rod 22 are movably connected to the same sphere 23. The axes of the first support rod 21 and the second support rod 22 intersect at the center of this sphere 23. This eliminates the need for a connecting piece 3, simplifying the structure of the measuring device and reducing costs.

[0051] The measuring tool includes an anvil and a telescopic measuring rod mounted on the anvil. In this embodiment, a digital or mechanical depth micrometer is selected as the measuring tool.

[0052] exist Figure 3From this perspective, the two ends of the elastic element 4 are detachably connected to the left third of the length of the first support rod 21 and the left third of the length of the second support rod 22, respectively. Of course, other locations are also possible, but the entry point formed by the elastic element 4, the connecting element 3, the first support rod 21, and the second support rod 22 needs to facilitate the entry and exit of the measuring rod. Because it is a detachable connection, the elastic element 4 can be removed for easy storage after measurement. In this embodiment, the elastic element 4 is installed on the side of the first support rod 21 and the second support rod 22 facing away from the bottom of the groove. This allows for easy observation of the extension and contraction of the elastic element 4 and convenient assembly and disassembly. In this embodiment, the elastic element 4 is a spring; however, it can also be an elastic rope or other components. No specific limitation is made here; the appropriate component can be selected based on actual needs. In the same measuring device, the model and specifications of the elastic element 4 are fixed and should not be arbitrarily changed to ensure that the tension of the elastic element 4 on the first support rod 21 and the second support rod 22 is the same, thereby ensuring that the center of the sphere 23 and the center of the corresponding first-level tenon groove 111 ultimately coincide to the same degree, thus ensuring the accuracy of the measurement. The lugs 41 at both ends of the elastic element 4 are respectively hooked to the first hook 212 and the second hook 222. In addition, the first hanging post 211, the second hanging post 221, and the sleeve rod 24 are parallel to each other.

[0053] Of course, the elastic element 4 can be omitted, and the angles between the first support rod 21 and the second support rod 22 and the width direction of the blade root groove can be adjusted manually.

[0054] The following describes a measurement method for measuring the root groove height of a turbine blade using a turbine blade root groove height measuring device provided in this embodiment:

[0055] S1. The first support rod 21 and the second support rod 22 are respectively mounted on the two primary tenon grooves 111 of the blade root groove 11 with a first initial included angle and a second initial included angle relative to the width direction of the blade root groove. In this embodiment, the first support rod 21 and the second support rod 22 have the same length, and the first initial included angle and the second initial included angle are the same and greater than zero degrees, and the elastic member 4 is in an extended state. Of course, the first initial included angle and the second initial included angle may not be equal. In addition, since the first support rod 21 and the second support rod 22 are movably connected together, the first support rod 21 and the second support rod 22 can be mounted on the two primary tenon grooves 111 with appropriate included angles relative to the width direction of the blade root groove. This can avoid the situation where the distance between the two primary tenon grooves 111 becomes smaller due to certain rust products on the surface of the blade root groove 11, which would prevent the ball 23 from smoothly entering the primary tenon groove 111. This improves the adaptability of the measuring device.

[0056] S2. Shake the first support rod 21 and the second support rod 22 left and right to squeeze or even remove foreign objects on the surface of the primary tenon groove 111, releasing the external force on the elastic member 4. Relying on the rebound force of the elastic member 4, reduce the first initial included angle and the second initial included angle to the first final included angle and the second final included angle respectively, so that the center of the ball 23 coincides with the center of the corresponding primary tenon groove 111. Since the center of the ball falls on the axis of the first support rod 21 or the axis of the second support rod 22, the center of the primary tenon groove 111 can be adjusted to the first support rod 21 and the second support rod 22 by the ball 23. Furthermore, in this embodiment, the rebound force of the elastic member 4 can always keep the first support rod 21 and the second support rod 22 taut. The two support rods 22 ensure that the angle between the first support rod 21 and the second support rod 22 and the width direction of the blade root groove remains unchanged during the measurement process, so that the center of the sphere 23 always coincides with the center of the corresponding first-stage tenon groove 111, further improving the measurement accuracy. Moreover, it eliminates the need to rely on the hand to maintain the angle between the first support rod 21 and the second support rod 22 and the width direction of the blade root groove, thereby improving the ease of operation. In addition, during the movement of the first support rod 21 and the second support rod 22, the sphere 23 will also slide along the first-stage tenon groove 111. The sliding of the sphere 23 can scrape away foreign objects on the surface of the first-stage tenon groove 111, further reducing the impact of foreign objects on the surface of the first-stage tenon groove 111 on the measurement accuracy.

[0057] S3. Place the measuring tool's anvil on the first support rod 21 and the second support rod 22, and gradually extend the measuring rod into the bottom of the leaf root groove 11;

[0058] S4. Read the scale value on the measuring rod. Subtract the radius value of the first support rod 21 or the second support rod 22 from this scale value to get the height value of the blade root groove 11.

[0059] This embodiment provides a turbine disk blade root groove height measuring device. Because the first support rod 21 and the second support rod 22 are movably connected together, and the sphere 23 connected to the first support rod 21 and the second support rod 22 has the same diameter, during the process of the angle between the first support rod 21 and the blade root groove width direction decreasing from a first initial angle to a first final angle, and the angle between the second support rod 22 and the blade root groove width direction decreasing from a second initial angle to a second final angle, the effective length of the first support rod 21 and the second support rod 22 in the blade root groove width direction increases. Ball 23 will gradually press against the side wall of the primary tenon groove 111, eventually aligning the center of ball 23 with the center of the corresponding primary tenon groove 111. This allows the center of the primary tenon groove 111 to be adjusted via ball 23 onto the first support rod 21 and the second support rod 22. Since the primary tenon groove 111 is located inside the circumferential surface 12 of the turbine disk 1, it is less susceptible to damage and deformation during blade disassembly or maintenance. Furthermore, the shape of the primary tenon groove 111 is stable along its length, resulting in relatively stable center positions at different locations along the length of the blade root groove 11. Furthermore, since the diameters of the first support rod 21 and the second support rod 22 are the same, at the first final angle and the second final angle, when the measuring anvil is on the first support rod 21 and the second support rod 22, and the measuring rod extends into the leaf root groove 11 and abuts against the bottom of the groove for measurement, the plane formed by the first support rod 21 and the second support rod 22 constitutes a more accurate measurement reference plane. Therefore, the measurement result of the leaf root groove height is more accurate. Moreover, since the sphere 23 forms a stable line contact with the leaf root groove 11, the measurement error caused by shaking can be reduced. In addition, since the first support rod 21 and the second support rod 22 have the same diameter, the plane formed by the first support rod 21 and the second support rod 22 constitutes a more accurate measurement reference plane. The support rods 22 are movably connected together, allowing the first support rod 21 and the second support rod 22 to be mounted at a suitable angle relative to the width direction of the blade root groove on the two primary tenon grooves 111. Compared to a design where the angle between the first support rod 21 and the second support rod 22 is fixed, this avoids the situation where the distance between the two primary tenon grooves 111 becomes smaller due to certain corrosion products on the surface of the blade root groove 11, preventing the sphere 23 on the first support rod 21 or the sphere 23 on the second support rod 22 from smoothly entering the corresponding primary tenon groove 111, thereby improving the adaptability of the measuring device. Furthermore, since the tenons on the blade root of the turbine blade directly interact with the primary tenon grooves 111, the measurement results obtained by mounting the first support rod 21 and the second support rod 22 on the two primary tenon grooves 111 are more accurate than those obtained by mounting them on the circumferential surface 12.

[0060] 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 turbine disc blade, characterized in that, The measuring device includes: The support structure (2) includes a first support rod (21) and a second support rod (22) of the same diameter that are movably connected together. Both ends of the first support rod (21) and the second support rod (22) are connected to spheres (23) respectively. The spheres (23) have the same diameter. The axis of the first support rod (21) and the axis of the second support rod (22) pass through the center of the corresponding two spheres (23). The first support rod (21) and the second support rod (22) are adapted to be mounted on the two first-level tenon grooves (111) opposite each other on the leaf root groove (11) with a first initial angle and a second initial angle respectively in the width direction of the leaf root groove. The first initial angle and the second initial angle are reduced to the first final angle and the second final angle respectively, so that the center of the sphere (23) coincides with the center of the corresponding first-level tenon groove (111). The first-level tenon groove (111) is the tenon groove farthest from the bottom of the leaf root groove (11). The measuring tool includes an anvil and a telescopic measuring rod mounted on the anvil. At the first final angle and the second final angle, the anvil is mounted on the first support rod (21) and the second support rod (22). The measuring device also includes a connector (3), which is located on one side of the anvil. The connector (3) is movably connected to the first support rod (21) and the second support rod (22) at two different positions along its length. The first support rod (21) and the second support rod (22) are made of the same material as the turbine disk (1); The diameter of the sphere (23) is the same as the diameter of the primary tenon groove (111); The length of the first support rod (21) is equal to the length of the second support rod (22); It also includes an elastic element (4), the two ends of which are connected to the first support rod (21) and the second support rod (22) respectively. The elastic element (4) and the connecting element (3) are located on opposite sides of the anvil. The elastic element (4) is configured such that after the external force is removed, the first initial angle and the second initial angle are reduced to the first final angle and the second final angle respectively by means of the rebound force of the elastic element (4), so that the center of the ball (23) coincides with the center of the corresponding first-level tenon groove (111). The center of the ball (23) falls on the axis of the first support rod (21) or the axis of the second support rod (22). The center of the first-level tenon groove (111) is adjusted to the first support rod (21) and the second support rod (22) through the ball (23).

2. The turbine blade root groove height measuring device according to claim 1, characterized in that, The connector (3) has collars (31) at both ends, and sleeves (24) are provided on the first support rod (21) and the second support rod (22). The collars (31) are fitted onto the corresponding sleeves (24) with a gap.

3. The turbine blade root groove height measuring device according to claim 1, characterized in that, One end of the first support rod (21) and one end of the second support rod (22) are movably connected to the same sphere (23).

4. The turbine blade root groove height measuring device according to claim 1, characterized in that, The elastic element (4) is installed on the first support rod (21) and the second support rod (22) on the side facing away from the bottom of the groove.

5. The turbine blade root groove height measuring device according to claim 1, characterized in that, The elastic element (4) is detachably connected to the first support rod (21) and the second support rod (22), respectively.

6. A method for measuring the root groove height of a turbine disk blade, applied to the turbine disk blade root groove height measuring device as described in any one of claims 1 to 5, characterized in that, The measurement method includes the following steps: S1. The first support rod (21) and the second support rod (22) with the same diameter and movably connected together, and forming a first initial angle and a second initial angle with the width direction of the leaf root groove respectively, are placed on two opposing first-level tenon grooves (111) on the leaf root groove (11). The first-level tenon groove (111) is the tenon groove farthest from the bottom of the leaf root groove (11). S2. Reduce the first initial included angle and the second initial included angle to the first final included angle and the second final included angle respectively, so that the center of the sphere (23) connected to both ends of the first support rod (21) and both ends of the second support rod (22) and having the same diameter coincides with the center of the corresponding first-level tenon groove (111); S3. Place the measuring tool's anvil on the first support rod (21) and the second support rod (22), and extend the measuring tool's probe into the leaf root groove (11) until it abuts against the bottom of the leaf root groove (11); S4. Read the scale value on the measuring rod.

7. The method for measuring the root groove height of a turbine disk blade according to claim 6, characterized in that, In step S1, at the first initial angle and the second initial angle, the elastic element (4) connected to the first support rod (21) and the second support rod (22) at both ends is in an extended state; in step S2, after the external force is removed, the first initial angle and the second initial angle are reduced to the first final angle and the second final angle by means of the rebound force of the elastic element (4).

8. A method for measuring the root groove height of a turbine disk blade according to claim 6 or 7, characterized in that, In step S4, the scale value minus the radius value of the first support rod (21) or the second support rod (22) equals the height value of the leaf root groove (11).

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