Measuring tool for measuring the dimensions of the intermediate body of a steam turbine blade

Abstract

The present invention provides a measuring tool for measuring the dimensions of an intermediate body of a steam turbine blade, which can solve the problems of high processing cost, lack of generality, and serious waste of tooling cost of the existing measuring templates for the intermediate body of the steam turbine blade. It includes two auxiliary plates and four measuring templates. The auxiliary plates are provided with kidney-shaped holes; the measuring templates are respectively an inner arc outlet side template and an inner arc inlet side template corresponding one by one to two measuring points on the inner arc side of the intermediate body, and a back arc outlet side template and a back arc inlet side template corresponding one by one to two measuring points on the back arc side of the intermediate body; the measuring templates are arranged perpendicular to the auxiliary plates and a first clamping angle is provided on the bottom surface thereof. The first clamping angle can be inserted into the kidney-shaped hole with a clearance fit and the bottom surface of the measuring template is attached to the top surface of the auxiliary plate; at the end of the measuring template pointing to the intermediate body, the upper surface thereof is consistent with the size and shape of the root height surface of the intermediate body at the corresponding measuring point, and the front end surface is consistent with the shape of the inner arc surface or the back arc surface of the intermediate body at the corresponding measuring point.

Description

Technical Field

[0001] The present invention relates to the field of steam turbine blade measurement, and specifically to a measuring tool for measuring the dimensions of the intermediate body of a steam turbine blade. Background Art

[0002] Steam turbine blades are the core components of power station generating units, and the intermediate body is an important part of the entire blade. The intermediate body is not only an assembly part, but also the dimensions of the intermediate body directly affect the working efficiency of the steam turbine.

[0003] Figure 1 It is a schematic diagram of the structure of a steam turbine blade. The dimensions of the intermediate body include the dimension of the intermediate body root height surface 1, the dimension of the intermediate body inner arc surface 2, and the dimension of the intermediate body back arc surface 3. The measurement of the intermediate body dimensions is carried out on the profile frame measuring tool 4 using the intermediate body measurement template. As Figure 2 shown, the traditional intermediate body measurement template includes an inner arc side template 5 and a back arc side template 6. The inner arc side template and the back arc side template are respectively a large integral template, which is designed according to the intermediate body dimension structure. During measurement, the inner arc side template 5 and the back arc side template 6 are respectively placed on the gear bar 7 of the profile frame measuring tool 4, and then two measurement points are taken along the blade root width direction on the inner arc side and the back arc side of the intermediate body respectively. The height difference between the upper surface of the intermediate body measurement template at the measurement point and the intermediate body root height surface 1, and the gap value between the front end surface of the intermediate body measurement template at the measurement point and the intermediate body inner arc surface 2 or the intermediate body back arc surface 3 are respectively detected, and then compared with the corresponding theoretical values to detect whether the intermediate body dimensions are qualified.

[0004] Due to the characteristics of multi-variety and small-batch processing of steam turbine blades, when using the traditional intermediate body measurement template to measure the intermediate body dimensions, for each steam turbine blade with different dimension structures, an intermediate body measurement template with a different dimension structure needs to be designed. The traditional intermediate body measurement template has a large structure and requires CNC milling for processing, resulting in high processing costs. The measuring tool has no universality, and the tooling cost is wasted seriously. Summary of the Invention

[0005] Aiming at the technical problems of high processing cost, no universality, and serious waste of tooling cost of the existing intermediate body measurement template for steam turbine blades, the present invention provides a measuring tool for measuring the intermediate body dimensions of steam turbine blades, which has low processing cost, strong universality, and can significantly reduce the tooling cost.

[0006] The technical solution is as follows: A measuring tool for measuring the dimensions of the intermediate body of a steam turbine blade, characterized in that it includes two auxiliary plates respectively arranged on the inner arc side and the back arc side of the intermediate body and arranged in a coplanar manner. Waist-shaped holes are provided on the auxiliary plates along the width direction of the blade root of the steam turbine blade; it also includes four measuring templates, which are respectively an inner arc outboard template and an inner arc inboard template corresponding one by one to two measuring points on the inner arc side of the intermediate body, and a back arc outboard template and a back arc inboard template corresponding one by one to two measuring points on the back arc side of the intermediate body; the measuring templates are arranged perpendicular to the auxiliary plates and a clamping angle one is provided on the bottom surface thereof. The clamping angle one can be inserted into the waist-shaped hole with a clearance fit and the bottom surface of the measuring template fits against the top surface of the auxiliary plate; at the end of the measuring template pointing to the intermediate body, the upper surface thereof is consistent with the size and shape of the root height surface of the intermediate body at the corresponding measuring point, and the front end surface is consistent with the shape of the inner arc surface or the back arc surface of the intermediate body at the corresponding measuring point.

[0007] It is further characterized in that:

[0008] It also includes four template guide blocks, and the four template guide blocks are arranged corresponding to the four measuring templates one by one. A clamping angle two is provided on the bottom surface of the template guide block. The clamping angle two can be inserted into the corresponding waist-shaped hole with a clearance fit and the bottom surface of the template guide block fits against the top surface of the auxiliary plate. The template guide block is detachably and fixedly connected to the corresponding auxiliary plate, and the side surface of the measuring template can fit against the side surface of the corresponding template guide block.

[0009] Corresponding to the clamping angle two below the auxiliary plate, pressing plates are respectively provided. The pressing plates straddle the corresponding waist-shaped holes. Threaded holes are processed on the bottom surface of the clamping angle two, and through holes are provided on the pressing plates opposite to the threaded holes. After the screws pass through the through holes, they are screwed into the threaded holes and locked by nuts.

[0010] The thickness of the measuring template is 5 mm to 8 mm.

[0011] Oblique chamfers are respectively processed on the left and right sides of the front end surface of the measuring template.

[0012] The beneficial effects of the present invention are:

[0013] The measuring tool for measuring the dimensions of the intermediate body of a steam turbine blade according to the present invention includes two auxiliary plates and four measuring templates arranged in one-to-one correspondence with four measuring points. The measuring templates are inserted into the kidney-shaped holes of the auxiliary plates through clamping corners, so that the measuring templates can slide along the kidney-shaped holes, and at the same time, the degrees of freedom of the measuring templates in the direction perpendicular to the kidney-shaped holes are restricted. During measurement, the two auxiliary plates are placed on the gear bars of the profile frame measuring tool, and then the clamping corners of the four measuring templates are inserted into the kidney-shaped holes and moved to the corresponding measuring point positions. Then, the height differences between the upper surfaces of the four measuring templates and the root height surface of the intermediate body, as well as the clearance values between the front end surfaces and the inner arc surface or the back arc surface of the intermediate body, can be detected respectively. By comparing with the theoretical values of the corresponding measuring points, the detection of the root height surface, the inner arc surface and the back arc surface dimensions of the intermediate body can be realized, that is, the measurement of the dimensions of the intermediate body of the steam turbine blade can be realized. For steam turbine blades with different dimensional structures, only four measuring templates need to be processed, and the rest of the components can be made universal. Since the measuring templates only correspond to the measuring points, their thickness requirements are thin, their size requirements are small, and the upper surface and the front end surface pointing to one end of the intermediate body only need to be processed in place by wire cutting, so that the manufacturing cycle of the measuring tool can be greatly shortened and the tooling manufacturing cost can be greatly reduced. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of a steam turbine blade;

[0015] Figure 2 It is a schematic diagram of the measurement state of a traditional intermediate body measuring template;

[0016] Figure 3 It is a top view of the present invention;

[0017] Figure 4 It is Figure 3 rear view of;

[0018] Figure 5 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 6 It is Figure 3 left view of the inner arc outboard template in;

[0020] Figure 7 It is Figure 3 right view of the inner arc inboard template in;

[0021] Figure 8 It is Figure 3 left view of the back arc outboard template in;

[0022] Figure 9 It is Figure 3 right view of the back arc inboard template in;

[0023] Figure 10Schematic diagram of the measurement state of the intermediate body measurement template of the present invention.

[0024] Reference numerals:

[0025] 1 - Intermediate body root height surface; 2 - Inner arc surface of the intermediate body; 3 - Back arc surface of the intermediate body; 4 - Profile frame measuring tool; 5 - Inner arc side template; 6 - Back arc side template; 7 - Gear bar

[0026] 11 - Auxiliary plate; 12 - Kidney-shaped hole; 13 - Inner arc out side template; 14 - Inner arc in side template; 15 - Back arc out side template; 16 - Back arc in side template; 17 - Clamping angle one; 18 - Upper surface; 19 - Front end face; 20 - Template guide block; 21 - Clamping angle two; 22 - Pressure plate; 23 - Screw; 24 - Nut; 25 - Oblique chamfer Detailed implementation manner

[0027] See Figures 1 to 10 , the measuring tool for measuring the dimensions of the intermediate body of the steam turbine blade of the present invention includes two auxiliary plates 11 respectively arranged on the inner arc side and the back arc side of the intermediate body and arranged in a coplanar manner. A kidney-shaped hole 12 is opened on the auxiliary plate 11 along the width direction of the blade root of the steam turbine blade; it also includes four measurement templates, which are respectively the inner arc out side template 13 and the inner arc in side template 14 corresponding one by one to two measurement points on the inner arc side of the intermediate body, and the back arc out side template 15 and the back arc in side template 16 corresponding one by one to two measurement points on the back arc side of the intermediate body; the measurement templates are arranged perpendicular to the auxiliary plate 11 and a clamping angle one 17 is provided on the bottom surface thereof. The clamping angle one 17 can be inserted into the kidney-shaped hole 12 with a clearance fit and the bottom surface of the measurement template fits against the top surface of the auxiliary plate 11; at the end of the measurement template pointing to the intermediate body, its upper surface 18 is the same as the size and shape of the intermediate body root height surface 1 at the corresponding measurement point, and the front end face 19 is the same as the shape of the inner arc surface 2 or the back arc surface 3 of the intermediate body at the corresponding measurement point.

[0028] See Figures 3 to 5, the measuring tool of the present invention further includes four template guide blocks 20, which are arranged in one-to-one correspondence with the four measuring templates. A second clamping angle 21 is provided on the bottom surface of the template guide block 20. The second clamping angle 21 can be inserted into the corresponding kidney-shaped hole 12 with a clearance fit, and the bottom surface of the template guide block 20 is attached to the top surface of the auxiliary plate 11. The template guide block 20 is detachably and fixedly connected to the corresponding auxiliary plate 11. Specifically, pressing plates 22 are respectively provided below the auxiliary plate 11 corresponding to the second clamping angle 21. The pressing plates 22 straddle the corresponding kidney-shaped holes 12. Threaded holes are machined on the bottom surface of the second clamping angle 21, through holes are opened on the pressing plates 22 opposite to the threaded holes, and screws 23 pass through the through holes and are screwed into the threaded holes and locked by nuts 24. The side surface of the measuring template can be attached to the side surface of the corresponding template guide block 20. By providing the template guide block, the template guide block can be moved to the four measuring points and fixed before measurement, and then the measuring template is moved to the position of the template guide block, and the template guide block is used to limit the measuring template to prevent the measuring template from being unstable during the measurement process and affecting the detection accuracy.

[0029] The thickness of the measuring template of the present utility model is 5 mm to 8 mm, preferably 6 mm. A 6-mm thick plate can be directly purchased for wire cutting processing, which is convenient for processing and has low cost.

[0030] See Figures 3 to 9 , chamfered edges 25 are respectively machined on the left and right sides of the front end surface of the measuring template. With such a design, it is more conducive to measuring the clearance value between the front end surface and the inner arc surface 2 or the back arc surface 3 of the intermediate body.

[0031] The following specifically describes the process of measuring the dimensions of the intermediate body of a steam turbine blade using the device of the present invention: Place the two auxiliary plates 11 on the gear bars 7 of the profile frame measuring tool 4. According to the positions of the four measuring points, fix the four template guide blocks 20 on the auxiliary plates 11, then insert the first clamping angles 17 of the four measuring templates into the kidney-shaped holes 12, and make the measuring templates abut against the corresponding template guide blocks 20. Then, respectively detect the height difference between the upper surface 18 of the four measuring templates and the root height surface 1 of the intermediate body, and the clearance value between the front end surface 19 and the inner arc surface 2 or the back arc surface 3 of the intermediate body, and then compare with the theoretical values of the corresponding measuring points, thus completing the measurement of the dimensions of the intermediate body of the steam turbine blade.

Claims

1. Measuring tool for measuring the intermediate body size of steam turbine blades, characterized in that: It includes two auxiliary plates which are respectively arranged on the inner arc side and the back arc side of the intermediate body and are arranged coplanarly. Waist-shaped holes are formed in the auxiliary plates along the width direction of the blade root of the steam turbine blade. It further includes four measuring templates. The measuring templates are respectively an inner arc outlet side template and an inner arc inlet side template corresponding one by one to two measuring points on the inner arc side of the intermediate body, and a back arc outlet side template and a back arc inlet side template corresponding one by one to two measuring points on the back arc side of the intermediate body. The measuring templates are arranged perpendicular to the auxiliary plates and a first clamping angle is provided on the bottom surface thereof. The first clamping angle can be inserted into the waist-shaped holes with a clearance fit and the bottom surface of the measuring template fits against the top surface of the auxiliary plate. At the end of the measuring template pointing to the intermediate body, the upper surface thereof is the same in size and shape as the root height surface of the intermediate body at the corresponding measuring point, and the front end surface is the same in shape as the inner arc surface or the back arc surface of the intermediate body at the corresponding measuring point. For steam turbine blades with different size structures, only four measuring templates need to be processed, and the rest of the components are universal. Since the measuring templates only correspond to the measuring points, their thickness requirements are thin, their size requirements are small, and the upper surface and the front end surface at the end of the measuring template pointing to the intermediate body can be processed in place only by wire cutting.

2. Measuring tool for measuring the intermediate body size of steam turbine blades according to claim 1, characterized in that: It further includes four template guide blocks which are arranged corresponding one by one to the four measuring templates. A second clamping angle is provided on the bottom surface of the template guide blocks. The second clamping angle can be inserted into the corresponding waist-shaped holes with a clearance fit and the bottom surface of the template guide blocks fits against the top surface of the auxiliary plate. The template guide blocks are detachably and fixedly connected to the corresponding auxiliary plates, and the side surface of the measuring template can fit against the side surface of the corresponding template guide block.

3. Measuring tool for measuring the intermediate body size of steam turbine blades according to claim 2, characterized in that: Corresponding to the second clamping angle respectively below the auxiliary plates, there are pressing plates. The pressing plates straddle the corresponding waist-shaped holes. Threaded holes are machined on the bottom surface of the second clamping angle, through holes are formed in the pressing plates opposite to the threaded holes, and screws pass through the through holes and are screwed into the threaded holes and locked by nuts.

4. Measuring tool for measuring the intermediate body size of steam turbine blades according to any one of claims 1 to 3, characterized in that: The thickness of the measuring template is 5 mm to 8 mm.

5. Measuring tool for measuring the intermediate body size of steam turbine blades according to any one of claims 1 to 3, characterized in that: Oblique chamfers are respectively machined on the left and right sides of the front end surface of the measuring template.

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