Turbine blade erosion degree measuring device

Abstract

The utility model relates to a turbine blade erosion degree measuring device which comprises an overall depth measuring vernier caliper and a local depth measuring dial indicator. The overall depth measurement vernier caliper comprises a main scale and a vernier, the main scale comprises a clamping head part and a main body part provided with scales, the clamping head part is arranged at one end of the main body part, the vernier is movably arranged on the main body part, and the clamping head part is provided with a clamping jaw used for being clamped in a blade erosion area; the local depth measuring dial gauge comprises a gauge body and a probe used for extending into an erosion groove of an erosion area, the gauge body comprises a dial plate and a moving rod movably arranged on the dial plate, and the probe is arranged at the end, away from the dial plate, of the moving rod. According to the utility model, the measurement accuracy can be ensured, the measurement error is avoided, and the blade inspection and judgment accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a device for measuring the erosion degree of steam turbine blades. Background Art

[0002] During the use of steam turbines, due to the high-speed operation of the blades and the influence of water droplets condensed from the steam in the environment, the blades are easily damaged by erosion, resulting in a decrease in the mechanical strength of the blades. In the field of nuclear power, large nuclear power steam turbines use longer blades with higher tip speeds. When the unit is running, the tip of the last-stage blade usually exceeds the speed of sound. Due to the low steam parameters of the low-pressure cylinder, the last few blades of the low-pressure cylinder rotor, especially the last-stage blades, work in a wet steam environment. The water droplets condensed in the steam will cause erosion to the high-speed rotating blades. In order to improve the erosion resistance of the last few blades of the low-pressure cylinder rotor, it is usually designed to embed carbide sheets on the steam inlet side of the blade tip, or to use electric spark strengthening technology for this part. As the running time of the unit increases, the design allows a certain degree of erosion on the steam inlet side of the blade tip, but when the erosion damage accumulates to a certain value, it may cause a decrease in the mechanical strength of the blade, or even lead to a serious accident of blade breakage. Therefore, in the inspection and maintenance of the low-pressure rotor blades of the steam turbine, it is necessary to regularly detect the erosion degree of the blades.

[0003] Existing inspection technology usually relies on visual observation to check whether the alloy sheet has been eroded to the point of affecting the blade base material, or whether the blade material is missing in the spark-strengthened area, without measuring and recording the degree of erosion. However, existing visual observation requires very high professional skills from maintenance personnel, and only those who have been engaged in the maintenance of low-pressure cylinder blades of steam turbines for many years may have the corresponding skills. At the same time, the subjective factors of visual observation are relatively high, and it is impossible to accurately define the degree of erosion, and thus it is impossible to accurately grasp the development process of blade erosion, and it is impossible to accurately judge whether the blade needs to be repaired, and the remaining erosion life of the blade, which can easily lead to missed maintenance opportunities and damage to the equipment during operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a device for measuring the erosion degree of steam turbine blades.

[0005] The utility model adopts the following technical solutions:

[0006] A device for measuring the erosion degree of a steam turbine blade is constructed, comprising:

[0007] An overall depth measuring vernier caliper for measuring the overall erosion depth of a blade, the overall depth measuring vernier caliper comprising a main scale and a vernier, the main scale comprising a clamping portion and a main body provided with a scale, the clamping portion being provided at one end of the main body, the vernier being movably provided on the main body, and the clamping portion being provided with a claw for clamping in the erosion area of ​​the blade;

[0008] A local depth measuring dial gauge for measuring the depth value of a local erosion pit of a blade, the local depth measuring dial gauge comprising a gauge body and a probe for extending into an erosion groove of an erosion zone, the gauge body comprising a dial and a moving rod movably arranged on the dial, the probe being arranged at the end of the moving rod away from the dial.

[0009] In some embodiments, the probe is tapered.

[0010] In some embodiments, the taper ratio of the probe is less than or equal to 1:20 and greater than or equal to 1:40.

[0011] In some embodiments, the width of the end of the probe away from the moving rod is less than or equal to 0.3 mm.

[0012] In some embodiments, the local depth measurement dial indicator also includes a support for positioning the meter body during measurement, the meter body also includes a sleeve fixed on the dial, the moving rod is inserted into the dial and the sleeve, and the support is arranged on the sleeve.

[0013] In some embodiments, the support is formed with a through hole, and the sleeve is inserted into the through hole.

[0014] In some embodiments, the end of the jaw proximate the cursor is formed with a tip.

[0015] In some embodiments, the claw has a rhombus-shaped cross section, and one of the axes of the rhombus is parallel to the moving direction of the cursor.

[0016] In some embodiments, the taper or slope of the jaw tip is less than or equal to 1:10 and greater than or equal to 1:20.

[0017] In some embodiments, the end surface of the cursor on the same side as the clamping claw is flush with the end surface of the clamping claw away from the clamping part.

[0018] The utility model has the following advantages:

[0019] The utility model can accurately measure the width of a blade at a specific erosion position by providing an integral depth measuring vernier caliper with a clamping jaw, and further calculate the erosion depth of the blade at the position. The clamping jaw can ensure that it fits and abuts against the erosion surface at the position to be measured, thereby ensuring the accuracy of the measurement and avoiding measurement errors.

[0020] By providing a local depth measurement dial indicator with a probe, a relatively fine probe can be inserted into a tiny erosion groove and abut against the lower end surface of the erosion groove, thereby ensuring measurement accuracy and avoiding measurement errors.

[0021] By using the overall depth measurement vernier caliper and the local depth measurement dial indicator, the limitations of visual inspection results can be avoided, the technical requirements for maintenance personnel are reduced, and the accuracy of blade inspection and judgment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a schematic diagram of the structure of an eroded steam turbine blade;

[0024] Figure 2 It is a structural schematic diagram of an integral depth measuring vernier caliper in a device for measuring the degree of erosion of a steam turbine blade in one embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a local depth measuring dial gauge in a device for measuring the degree of erosion of a steam turbine blade in one embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of the measurement position that needs to be made when measuring the overall erosion depth value A;

[0027] Reference numerals:

[0028] 1- overall depth measurement vernier caliper; 11- main scale; 111- clamping part; 112- main body; 1111- clamping claw; 1111a- tip; 12- vernier caliper; 13- indicator;

[0029] 2-local depth measurement dial indicator; 21-meter body; 211-dial; 212-sleeve; 213-moving rod; 214-stop cap; 22-probe; 23-support. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside", "inside", "outside", etc. are based on the directions or positional relationships shown in some of the drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0031] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0033] Figure 1 and Figure 2 A device for measuring the erosion degree of a steam turbine blade in an embodiment of the utility model is shown, which can measure the overall erosion depth value A and the local erosion pit depth value B of the steam turbine blade after erosion.

[0034] like Figure 1As shown, after the turbine blade is eroded, a concave erosion area will be generated at the end of the steam inlet edge of the blade close to the blade tip, and the erosion area is an uneven erosion groove. The overall erosion depth value A is the distance from the original edge of the steam inlet edge of the blade to the edge after erosion, and the local erosion pit depth value B is the depth value of the uneven erosion groove. The side indicated by the letter E is the steam inlet edge of the blade, the side indicated by the letter F is the steam outlet edge of the blade, the end indicated by the letter C is the tip of the blade, and the end indicated by the letter D is the root of the blade. The position indicated by the letter P is the original edge of the steam inlet edge of the blade, and the position indicated by the letter Q is the edge of the steam inlet edge of the blade after erosion.

[0035] It should be understood that in the direction from the tip to the root of the blade (that is, Figure 1 In the direction from end C to end D), the overall erosion depth value A and the local erosion pit depth value B at different locations are different.

[0036] like Figure 2 and Figure 3 As shown, the turbine blade erosion degree measuring device comprises an overall depth measuring vernier caliper 1 and a local depth measuring dial gauge 2. The overall depth measuring vernier caliper 1 is used to measure the overall erosion depth value A, and the local depth measuring dial gauge 2 is used to measure the local erosion pit depth value B.

[0037] It should be understood that the overall depth measuring vernier caliper 1 measures the depth of the eroded area from the tip to the root of the blade (i.e. Figure 1 The actual width of the blade at a certain position (from the C end to the D end in the figure) is compared with the original width of the blade in the uneroded area, and the difference is the overall erosion depth value A.

[0038] like Figure 2 As shown, the overall depth measurement vernier caliper 1 includes a main scale 11 and a vernier 12, and the main scale 11 includes a clamping portion 111 and a main body 112. The clamping portion 111 is arranged at one end of the main body 112, and is used to be clamped at one end of the object to be measured along the direction to be measured. The main body 112 is arranged in a longitudinal direction and is marked with scales for displaying the measured value of the object to be measured. The vernier 12 is movably arranged on the main body 112, and is used to be clamped at the other end of the object to be measured along the direction to be measured. At this time, the value shown on the main body 112 is the value of the position to be measured of the object to be measured. In the present application, it is the actual width value of the blade at the measuring position.

[0039] Specifically, the clamping part 111 is provided with a clamping claw 1111 for clamping in the blade erosion area. Since the edge of the blade erosion area is irregularly curved and has pits of different sizes, if an ordinary measuring ruler is used, the contact surface between the measuring ruler and the object to be measured is relatively wide, and it is impossible to completely abut against the edge of the measuring position (that is, the edge Q of the steam inlet edge of the blade after erosion) during the measurement process. There is a gap between the edge Q and at least some positions on the contact part of the measuring ruler, which leads to a large measurement error. The setting of the clamping claw 1111 enables the clamping part 111 to change the original surface contact between the ordinary measuring ruler and the object to be measured into a point contact (or line contact) between the clamping claw 1111 and the edge Q during the measurement process. Regardless of the degree of curvature of the edge Q at the measured position, the contact part of the clamping claw 1111 can completely abut against the edge Q at the position. It avoids the situation in which part of the contact part abuts against the edge Q during the measurement process, and there is a gap between the remaining part of the contact part and the edge Q. The overall depth measuring vernier caliper 1 can accurately measure the depth of the blade from the tip to the root ( Figure 1 The blade width at various positions in the erosion area (from the C-end to the D-end direction) is calculated to obtain the overall erosion depth value A.

[0040] like Figure 3 As shown, the local depth measurement dial gauge 2 includes a meter body 21 and a probe 22, wherein the meter body 21 includes a dial 211 and a moving rod 213. The moving rod 213 is movably arranged on the dial 211, and measures the target value by the distance it moves. The dial 211 is provided with a numerical dial with a rotating needle (not shown in the figure), and the rotating needle on the numerical dial is rotated by cooperating with the moving rod 213 to indicate the numerical value moved by the moving rod 213. The probe 22 is arranged at the end of the moving rod 213 away from the dial 211, and can be extended into the bottom end of the erosion groove in the erosion area, so that the local erosion pit depth value B can be accurately measured by the probe 22.

[0041] By providing the probe 22, the problem that the end of the larger moving rod 213 is difficult to reach the bottom of the erosion groove can be solved, thereby achieving the measurement of the local erosion pit depth value B and ensuring the measurement accuracy.

[0042] For example Figure 2 As shown, in some embodiments, a tip 1111a is formed at the end of the claw 1111 near the cursor 12 to ensure that the claw 1111 can be accurately clamped on the blade erosion area at a specific position to avoid a gap between the claw 1111 and the blade erosion area, which would cause inaccurate measurement.

[0043] In this embodiment, the cross section of the clamping claw 1111 is rhombus-shaped, and the clamping claw 1111 and the main body 112 are respectively located on two adjacent side end surfaces of the clamping head 111. One axis of the rhombus-shaped cross section of the clamping claw 1111 is parallel to the moving direction of the cursor 12.

[0044] Specifically, see Figure 2 In this embodiment, the main body 112 is in the shape of a longitudinal rod, and the cursor 12 is arranged on the main body 112 to move back and forth along the long axis direction of the main body 112. One of the axes of the rhombus of the cross section of the claw 1111 is parallel to the long axis of the main body 112. That is, Figure 2 The axis L and axis M are parallel.

[0045] At this time, the end of the rhombus-shaped cross-section of the claw 1111 close to the corner of the main body 112 is the tip 1111a, so that the tip 1111a is close to the end of the cursor 12, and the tip 1111a can be against the blade erosion area when in use.

[0046] In some other optional embodiments, the cross-section of the claw 1111 may also be blade-shaped, fan-shaped, triangular, or other structures with a similar tip 1111a.

[0047] It should be understood that the “cross section of the clamping claw 1111 ” here refers to the cross section parallel to the contact surface between the clamping claw 1111 and the clamping head 111 .

[0048] In this embodiment, the cross-section of the claw 1111 is a long rhombus, including a long axis and a short axis, wherein the long axis is parallel to the extension direction of the main body 112, so as to ensure that the tips 1111a of the claws 1111 can also abut against each other at relatively small pits.

[0049] In some implementations, the taper or slope of the tip 1111a is less than or equal to 1:10 and greater than or equal to 1:20.

[0050] Taking the claw 1111 described in this embodiment as an example, when the two sides at its tip 1111a have an angle with its long axis, the ratio of the projection of its two sides in the direction of its short axis to the projection in the direction of its long axis is called "taper", and its value must be less than or equal to 1:10 and greater than or equal to 1:20.

[0051] When the structure of the claw 1111 is similar to the triangular structure on one side of the long axis of the claw 1111 described in this embodiment, one side is perpendicular to the long axis, and the other side has an angle with the long axis. At this time, the ratio of the projection of the side at an angle with the long axis in the direction of the short axis to the projection in the direction of the long axis is called "slope".

[0052] It should be understood that for blade-shaped, olive-shaped and other structures with arc-shaped sides, it is also possible to determine whether they are within the required taper (or slope) ratio based on the ratio of their projection in the short axis direction to their projection in the long axis direction.

[0053] In some embodiments, the end surface of the cursor 12 on the same side as the claw 1111 is flush with the end surface of the claw 1111 away from the clamping portion 111. In this way, during the measurement process, the cursor 12 and the claw 1111 can simultaneously abut against the two ends of the blade for measurement.

[0054] In some embodiments, the overall depth measuring vernier caliper 1 also includes a connecting wire (not shown in the figure), one end of which is fixed to the vernier 12, and the other end can be tied to the operator's wrist during use to avoid falling off during measurement and being unable to be taken out.

[0055] In some other optional embodiments, the connecting line may also be disposed on the clamping portion 111 .

[0056] In some embodiments, the cursor 12 is also connected to a counter 13 for displaying the measured value.

[0057] It should be understood that the main body 112 and the indicator 13 may adopt existing technologies.

[0058] In this embodiment, the overall depth measuring vernier caliper 1 is a depth vernier caliper.

[0059] In the specific use process, due to the irregular overall curvature and erosion depth of the erosion area, and the irregular depth of the erosion groove at different positions, it is necessary to mark the measurement position on the blade first. On the steam outlet side of the blade, starting from the position 10mm away from the blade tip, mark from the blade tip to the blade root, and the interval between two adjacent marks is 20mm. According to the size and degree of erosion of different blades, mark one to s measurement positions, such as Figure 4 shown.

[0060] Furthermore, the cursor 12 is pressed against and firmly pressed against the edge of the steam outlet side of the blade, and the claw 1111 is clamped at the first measuring position of the erosion area of ​​the steam inlet side, and the width dimension H1 of the blade at this position is measured.

[0061] It should be understood that, during the measurement process, the main body 112 needs to be parallel to the axis of the blade in the width direction (ie, the cursor 12 is against and firmly against the edge of the steam outlet side of the blade) to avoid measurement errors.

[0062] Furthermore, the second measuring position and the Sth measuring position are measured one by one to obtain the blade width dimensions H2-Hs at different positions.

[0063] Furthermore, the overall erosion depth value A at each measurement position is calculated. The overall erosion depth value A can be calculated by formula 1:

[0064] A=H―Hs; Formula 1

[0065] Among them, A is the overall erosion depth value;

[0066] H is the standard blade width value;

[0067] Hs is the measured width of the blade at position s.

[0068] The maximum overall erosion depth value Amax of the blade can be obtained through the overall erosion depth value A at different positions. If the maximum overall erosion depth value Amax reaches 4 mm, it is necessary to consider replacing the blade.

[0069] For example Figure 3 As shown, in some embodiments, the probe 22 of the local depth measurement dial gauge 2 is in the shape of a tapered needle.

[0070] Specifically, the taper ratio should be less than 1:20 and greater than or equal to 1:40, thereby ensuring that the probe can be inserted into the bottom of a small erosion groove and docked with the bottom of the erosion groove, thereby ensuring the accuracy of the measurement.

[0071] Furthermore, the width of the probe 22 away from the end of the moving rod 213 is less than or equal to 0.3 mm, thereby further ensuring the accuracy of the measurement.

[0072] In the present embodiment, the probe 22 is in the shape of a longitudinally long cylinder, and “the width is less than or equal to 0.3 mm”, in the present embodiment, means that the diameter of the probe 22 is less than or equal to 0.3 mm.

[0073] In some other optional embodiments, when the probe 22 is a longitudinal non-cylindrical structure, "width is less than or equal to 0.3 mm" means that the dimension value of the longest dimension position of its cross-sectional shape perpendicular to the length direction is less than or equal to 0.3 mm.

[0074] In some embodiments, the watch body 21 further includes a sleeve 212 and a stopper cap 214, wherein the stopper cap 214 is movably disposed on the dial 211 and connected to the end of the moving rod 213 away from the detection end, and is used to drive the movement of the moving rod 213 through the stopper cap 214 to pull it up. The sleeve 212 is fixed on the dial 211, and the moving rod 213 is inserted into the sleeve 212, and its detection end is inserted from the sleeve 212. When the stopper cap 214 pulls up the moving rod 213, the exposed end of the moving rod 213 is at least partially retracted into the sleeve 212.

[0075] The local depth measurement dial gauge 2 further includes a support 23 , which is disposed on the sleeve 212 and is used to position the gauge body 21 during measurement.

[0076] It should be understood that the length of the support 23 must ensure that, at the extreme position where the moving rod 213 moves toward the blocking cap 214 , the end of the probe 22 away from the moving rod 213 is located in the support 23 .

[0077] During the measurement, the support 23 is pressed against the erosion zone on the steam inlet side, and the probe 22 is inserted into the erosion groove of the erosion zone, thereby obtaining accurate data of the erosion groove.

[0078] In this embodiment, the support 23 is formed with a through hole, and the sleeve 212 is inserted into the through hole.

[0079] It should be understood that the watch body 21 can adopt existing technology.

[0080] In some embodiments, the probe 22 may be made of a material with high hardness and wear resistance, such as tungsten alloy.

[0081] In the specific measurement process, the local depth measurement dial gauge 2 needs to be zeroed first. For example, the stop cap 214 is pulled up to shrink the lower end of the probe 22 into the support 23, the lower end surface of the support 23 is pressed against a certain plane, and the stop cap 214 is released to make the end of the probe 22 away from the moving rod 213 and the lower end of the support 23 be on the same plane, and manual zeroing is performed at this time.

[0082] Furthermore, pull up the stop cap 214, place the ratio support 23 of the local depth measurement dial indicator 2 after zeroing on the measuring surface (i.e., the erosion surface at a certain measuring position), and release the stop cap 214, so that the moving rod 213 drives the probe 22 to move, and the lower end surface of the probe 22 abuts against the bottom of the erosion groove. At this time, read the value on the dial 211, which is the local erosion pit depth value B at the measuring position.

[0083] It should be understood that the local erosion pit depth value B usually does not exceed 1.5 mm.

[0084] When the measured local erosion pit depth value B exceeds 1.5 mm, it is necessary to evaluate it in combination with the overall erosion depth value A:

[0085] If the measurement position where the local erosion pit depth value B exceeds 1.5mm is less than 100mm from the blade tip, it can continue to be used and tracked. If the measurement position where the local erosion pit depth value B exceeds 1.5mm is greater than or equal to 100mm from the blade tip, it needs to be replaced. If the local erosion pit depth value B exceeds 1.5mm and the overall erosion depth value A is less than 3mm, it can continue to be used and tracked. If the local erosion pit depth value B exceeds 1.5mm and the overall erosion depth value A is greater than or equal to 3mm, it needs to be replaced.

[0086] Furthermore, the turbine blade erosion degree measuring device can also be used to measure the overall erosion depth value A and the local erosion pit depth value B of the same blade in different time periods, and compare them with previous data to calculate the blade erosion rate, and make an erosion and time function curve, and calculate the remaining erosion life of the blade based on the rate and function curve.

[0087] The utility model can quantitatively understand the scouring situation of the turbine blades, grasp the development process of each blade scouring, calculate the blade scouring rate, and make a scouring and time function curve by constructing a turbine blade scouring degree measuring device. The remaining life of the blade scouring is calculated according to the rate and function curve, and the blades that are severely scoured and cannot be safely operated for a maintenance cycle are promptly found for maintenance and treatment to ensure the safe operation of the unit. Moreover, the maintenance skill requirements of maintenance personnel can be greatly reduced, and the maintenance results are more accurate, which solves the limitations of previous visual inspection results, reduces the technical requirements for maintenance personnel, and reduces the situation of incorrect judgment of inspection results.

[0088] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A device for measuring the erosion degree of a steam turbine blade, characterized in that: include: An overall depth measuring vernier caliper (1) for measuring an overall erosion depth value of a blade, the overall depth measuring vernier caliper (1) comprising a main scale (11) and a vernier (12), the main scale (11) comprising a clamping portion (111) and a main body (112) provided with a scale, the clamping portion (111) being arranged at one end of the main body (112), the vernier (12) being movably arranged on the main body (112), and the clamping portion (111) being provided with a clamping claw (1111) for clamping in an erosion zone of the blade; A local depth measuring dial gauge (2) for measuring the depth value of a local erosion pit of a blade, the local depth measuring dial gauge (2) comprising a gauge body (21) and a probe (22) for extending into an erosion groove of an erosion area, the gauge body (21) comprising a dial (211) and a moving rod (213) movably arranged on the dial (211), the probe (22) being arranged at the end of the moving rod (213) away from the dial (211).

2. The device for measuring the erosion degree of steam turbine blades according to claim 1, characterized in that: The probe (22) is tapered.

3. The device for measuring the erosion degree of steam turbine blades according to claim 2, characterized in that: The taper ratio of the probe (22) is less than or equal to 1:20 and greater than or equal to 1:

40.

4. The device for measuring the erosion degree of steam turbine blades according to claim 3, characterized in that: The width of the end of the probe (22) away from the moving rod (213) is less than or equal to 0.3 mm.

5. The device for measuring the erosion degree of steam turbine blades according to claim 1, characterized in that: The local depth measurement dial gauge (2) further comprises a support (23) for positioning the gauge body (21) during measurement; the gauge body (21) further comprises a sleeve (212) fixed on the dial (211); the moving rod (213) is inserted into the dial (211) and the sleeve (212); and the support (23) is arranged on the sleeve (212).

6. The device for measuring the erosion degree of steam turbine blades according to claim 5, characterized in that: The support (23) is formed with a through hole, and the sleeve (212) is inserted into the through hole.

7. The device for measuring the erosion degree of steam turbine blades according to claim 1, characterized in that: The end of the claw (1111) close to the cursor (12) is formed with a pointed end.

8. The device for measuring the erosion degree of steam turbine blades according to claim 7, characterized in that: The claw (1111) has a rhombus-shaped cross section, and one of the axes of the rhombus is parallel to the moving direction of the cursor (12).

9. The device for measuring the erosion degree of steam turbine blades according to claim 7, characterized in that: The taper or slope of the tip of the claw (1111) is less than or equal to 1:10 and greater than or equal to 1:

20.

10. The device for measuring the erosion degree of steam turbine blades according to claim 1, characterized in that: The end surface of the cursor (12) on the same side as the clamping claw (1111) is flush with the end surface of the clamping claw (1111) away from the clamping head (111).

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