Blade root radial measurement equipment and method for turbine blade

Abstract

The invention belongs to the technical field of measuring equipment, and particularly relates to a blade root radial measuring device and method for a steam turbine blade, the blade root radial measuring device comprises a measuring table and a conveying belt, and the measuring table is provided with a processor module; the measuring table is connected with a positioning seat and a measuring assembly. The side face of the positioning seat is provided with an arc-shaped groove matched with the blade root of the turbine blade. The measuring table is provided with a pushing mechanism used for driving the measuring assembly to move. The measuring assembly comprises a sliding seat, the pushing mechanism is connected with the sliding seat, a sliding rail in sliding connection with the sliding seat is arranged on the measuring table, and the sliding seat is fixedly connected with a pushing frame used for moving the turbine blade into the arc-shaped groove; the measuring table is fixedly connected with a graduated scale, the sliding seat is in sliding connection with the graduated scale, and the sliding seat is provided with a camera; according to the invention, the positioning seat and the measuring assembly are arranged, so that secondary radial measurement of different positions of the blade root of the turbine blade can be carried out, and the measurement efficiency and precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring devices, and particularly relates to a root radial measuring device and method for steam turbine blades. Background Art

[0002] A steam turbine is a type of turbomachine. Turbine is derived from the English word "Turbine", which means a rotary fluid power machine, mainly used for the mutual conversion of gas thermal energy and mechanical work. A steam turbine is a thermal turbomachine that uses steam as the working medium and converts the thermal energy of steam into mechanical work. The blade roots in a steam turbine cooperate with each other to play a role in converting thermal energy into mechanical energy. In order to improve the efficiency of energy conversion, it is necessary to ensure the precise installation position of each adjacent blade root. Therefore, before installing the blades, it is necessary to measure the root radial dimensions of the steam turbine blades.

[0003] When the existing measuring device measures the radial dimension of a steam turbine blade, it is necessary to remove the steam turbine blade from the production line and then take it to the measuring device for individual measurement. This measurement method is only suitable for spot-checking steam turbine blades, with low measurement efficiency and not applicable to the measurement of large-scale products. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a root radial measuring device and method for steam turbine blades. By providing a positioning seat and a measuring component, it can comprehensively measure the root of the steam turbine blade on the production line, aiming to solve the problems in the background art.

[0005] To achieve the above technical purpose, the specific technical solution of the present invention is as follows. A root radial measuring device for steam turbine blades proposed by the present invention includes: a measuring table and a conveyor belt. A groove for the conveyor belt to pass through is provided on the measuring table, and the conveyor belt is used to convey the steam turbine blade. A processor module is provided on the measuring table; a positioning seat and a measuring component are respectively connected to the measuring table, and the positioning seat and the measuring component are respectively arranged on both sides of the conveyor belt; an arc-shaped groove matching with the root of the steam turbine blade is provided on the side of the positioning seat, and a pushing mechanism for driving the measuring component to move is installed on the measuring table; the measuring component includes a sliding seat, the pushing mechanism is connected to the sliding seat, a slide rail slidably connected to the sliding seat is provided on the measuring table, a pushing frame is fixedly connected to the sliding seat for moving the steam turbine blade into the arc-shaped groove; and a scale is fixedly connected to the measuring table, the sliding seat is slidably connected to the scale, and a camera is installed on the sliding seat for recording the position of one end of the sliding seat on the scale.

[0006] As a preferred technical solution of the present invention, a vertically arranged driving roller is rotatably connected to the pushing frame, the driving roller contacts the root of the steam turbine blade, a first transmission wheel is coaxially connected to the driving roller, a second transmission wheel is rotatably connected to the pushing frame, and a transmission belt is connected between the first transmission wheel and the second transmission wheel.

[0007] As a preferred technical solution of the present invention, a rotating member is coaxially connected to the second transmission wheel, and a rack cooperating with the rotating member is fixedly connected to the measuring table.

[0008] As a preferred technical solution of the present invention, the rotating member includes: an outer gear ring, which meshes with the rack; a ratchet wheel, which is rotatably connected inside the outer gear ring and is coaxially and fixedly connected to the second transmission wheel; a plurality of pawls cooperating with the ratchet wheel are connected to the inner wall of the outer gear ring, and an elastic member is fixedly connected between the pawl and the inner wall of the outer gear ring.

[0009] As a preferred technical solution of the present invention, a bracket is fixedly connected to the positioning seat, a sliding rod is fixedly connected to the bracket, a push block is fixedly connected to one end of the sliding rod, and an avoidance hole cooperating with the push block is provided on the inner wall of the arc-shaped groove.

[0010] As a preferred technical solution of the present invention, a stopper is fixedly connected to the sliding rod, a cylindrical spring is connected to the sliding rod, the cylindrical spring is arranged between the stopper and the bracket, and a limit nut is connected to the end of the sliding rod.

[0011] As a preferred technical solution of the present invention, a pair of pressure wheels are rotatably connected to both sides of the push block, and the pressure wheels are in contact with the blade root of the steam turbine blade.

[0012] As a preferred technical solution of the present invention, a pair of rotating rods are rotatably connected to the push frame, a limiting roller is rotatably connected to the rotating rod, the two limiting rollers are symmetrically arranged on both sides of the driving roller, and a tension spring is fixedly connected between the two rotating rods.

[0013] A method for radially measuring the blade root of a steam turbine blade includes the following steps: Step 1: The conveyor belt conveys the steam turbine blade. When the steam turbine blade moves between the positioning seat and the measuring assembly, the conveyor belt stops running; Step 2: The pushing mechanism pushes the measuring assembly to move, so that the driving roller contacts the surface of the blade root of the steam turbine blade, completely moves the blade root of the steam turbine blade into the arc-shaped groove, and then the camera captures the value on the scale and sends it to the processor module to complete the first measurement of the radial direction of the blade root of the steam turbine blade; Step 3: The pushing mechanism drives the measuring assembly to return. During the return process, the blade root of the steam turbine blade is tightly clamped between the pressure wheel and the driving roller, and the rack drives the rotating member to rotate. When the rotating member rotates, it drives the driving roller to rotate, and the driving roller drives the blade root of the steam turbine blade to rotate 90°, until the measuring assembly returns to its original position; Step 4: The pushing mechanism pushes the measuring assembly to move for the second time, again completely moves the blade root of the steam turbine blade into the arc-shaped groove, and then the camera captures the value on the scale and sends it to the processor module again to complete the second measurement of the radial direction at different positions of the blade root of the steam turbine blade.

[0014] The beneficial effects of the present invention are: 1. The present invention is provided with a positioning seat and a measuring assembly. When the conveyor belt transports the turbine blade between the positioning seat and the measuring assembly, the pushing mechanism drives the measuring assembly to move. The measuring assembly pushes the turbine blade to move into the arc groove of the positioning seat. The camera records the value on the scale to complete the automatic measurement of the turbine blade, so that the turbine blade can be measured during the transportation process.

[0015] 2. After the measuring assembly of the present invention completes one measurement of the turbine blade, the measuring assembly can drive the turbine blade to rotate 90° through the rotation of the drive roller during the process of driving the turbine blade back, thereby changing the radial measurement position of the blade root of the turbine blade, and then measure the turbine blade a second time, so that the radial measurement positions of the turbine blades are different twice, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a turbine blade root radial measurement device proposed by the present invention.

[0017] Figure 2 This is a front view schematic diagram of a turbine blade root radial measurement device proposed by the present invention.

[0018] Figure 3 This is a schematic structural diagram of the positioning seat proposed in the present invention.

[0019] Figure 4 This is a schematic diagram from another angle of the positioning seat proposed by the present invention.

[0020] Figure 5 This is a schematic structural diagram of the measurement component proposed in the present invention.

[0021] Figure 6 This is a schematic structural diagram of the rotating part proposed in the present invention.

[0022] In the figure: 1. Measuring table; 2. Positioning seat; 201. Push block; 202. Pressure wheel; 203. Slide rod; 204. Avoidance hole; 205. Bracket; 206. Cylindrical spring; 207. Stop block; 208. Limit nut; 209. Arc groove; 3. Measuring assembly; 301. Slide; 302. Push frame; 303. Drive roller; 304. First transmission wheel; 305. Second transmission wheel; 306. Transmission belt; 307. Rotating member; 3071. Outer gear ring; 3072. Ratchet; 3073. Paw; 3074. Elastic member; 308. Rotating rod; 309. Limit roller; 310. Tension spring; 311. Camera; 4. Pushing mechanism; 5. Rack; 6. Slide rail; 7. Scale; 8. Processor module; 9. Conveyor belt; 10. Groove. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] Embodiment: This embodiment discloses a root radial measurement device for steam turbine blades. As Figures 1-6 shown, it includes a measurement table 1 and a conveyor belt 9. The conveyor belt 9 passes through the measurement table 1. There is a groove 10 on the measurement table 1 for the conveyor belt 9 to pass through, and the conveyor belt 9 is flush with the surface of the measurement table 1. The conveyor belt 9 is used to convey steam turbine blades. A processor module 8 is provided on the measurement table 1 for receiving measurement data. Among them, a positioning seat 2 and a measurement component 3 are respectively connected to the measurement table 1. The positioning seat 2 and the measurement component 3 are respectively arranged on both sides of the conveyor belt 9. A pushing mechanism 4 for driving the measurement component 3 to move is installed on the measurement table 1. The pushing mechanism 4 uses a cylinder. By driving the measurement component 3 to move through the pushing mechanism 4, the root of the steam turbine blade is driven to move to the position of the positioning seat 2.

[0025] As Figures 3-4 shown, an arc-shaped groove 209 matching the root of the steam turbine blade is provided on the side of the positioning seat 2. The diameter of the arc-shaped groove 209 is slightly larger than the diameter of the root of the steam turbine blade, so that the root of the steam turbine blade can be completely moved into the arc-shaped groove 209. A bracket 205 is fixedly connected to the positioning seat 2, and a slide rod 203 is fixedly connected to the bracket 205. One end of the slide rod 203 is fixedly connected to a push block 201. The push block 201 is arranged in the arc-shaped groove 209. A pair of pressure wheels 202 are rotatably connected to both sides of the push block 201. The pressure wheels 202 are in contact with the root of the steam turbine blade, which is convenient for the root of the steam turbine blade to rotate, and the pressure wheels 202 play a role in limiting both sides of the root of the steam turbine blade to prevent the position of the steam turbine blade from shifting; and an avoidance hole 204 matching the push block 201 is provided on the inner wall of the arc-shaped groove 209. When the root of the steam turbine blade moves into the arc-shaped groove 209, the push block 201 is completely pressed into the avoidance hole 204. Among them, a stop block 207 is fixedly connected to the slide rod 203, and a cylindrical spring 206 is connected to the slide rod 203. When the push block 201 is pressed into the avoidance hole 204, the cylindrical spring 206 is arranged between the stop block 207 and the bracket 205, and a limit nut 208 is connected to the end of the slide rod 203. The cylindrical spring 206 is compressed by force. When the measurement component 3 returns to the original position, the push block 201 moves in the direction of the outside of the arc-shaped groove 209 under the elastic force of the cylindrical spring 206, and then automatically pushes the steam turbine blade to move onto the conveyor belt 9. The conveyor belt 9 conveys the measured steam turbine blade to the next station.

[0026] As Figure 5As shown in the figure, the measuring component 3 includes a sliding seat 301. The pushing mechanism 4 is connected to the sliding seat 301. A slide rail 6 slidably connected to the sliding seat 301 is provided on the measuring table 1. The sliding seat 301 is fixedly connected with a pushing frame 302 for moving the steam turbine blade into the arc-shaped groove 209. The pushing frame 302 is in an inverted L shape. A vertically arranged driving roller 303 is rotatably connected to the pushing frame 302. The driving roller 303 contacts the blade root of the steam turbine blade. When the driving roller 303 rotates, it can drive the steam turbine blade to rotate. A first transmission wheel 304 is coaxially connected to the driving roller 303. A second transmission wheel 305 is rotatably connected to the pushing frame 302. A transmission belt 306 is connected between the first transmission wheel 304 and the second transmission wheel 305. A rotating member 307 is coaxially connected to the second transmission wheel 305. A rack 5 cooperating with the rotating member 307 is fixedly connected to the measuring table 1. This embodiment includes measuring both sides of the steam turbine blade. During the first measurement, when the pushing mechanism 4 drives the steam turbine blade to move towards the positioning seat 2, the steam turbine blade is moved into the arc-shaped groove 209. During the movement, the rack 5 does not drive the rotating member 307 to move, and the driving roller 303 is in a non-rotating state. When the pushing mechanism 4 moves back, the steam turbine blade moves back under the thrust of the push block 201. The blade root of the steam turbine blade is clamped between the driving roller 303 and the pressure roller 202. During the backward movement, the rack 5 drives the rotating member 307 to rotate. The rotating member 307 drives the second transmission wheel 305 to rotate, and then drives the driving roller 303 to rotate. When the driving roller 303 rotates, it drives the steam turbine blade to rotate. When the steam turbine blade returns to the conveyor belt 9, the steam turbine blade rotates about 90°. Then the pushing mechanism 4 pushes the steam turbine blade into the arc-shaped groove 209 again to perform a secondary measurement on the steam turbine blade. Among them, these two times respectively measure the radial direction of different positions of the blade root of the steam turbine blade, ensuring the comprehensiveness of the measurement and improving the measurement accuracy of the blade root of the steam turbine blade.

[0027] Among them, a scale 7 is fixedly connected to the measuring table 1. The accuracy of the scale 7 is set to 0.1 mm. The sliding seat 301 is slidably connected to the scale 7. A camera 311 is installed on the sliding seat 301 for recording the position of one end of the sliding seat 301 on the scale 7. The value of the position of one end of the sliding seat 301 on the scale 7 is the measured value. By focusing and magnifying the scale 7 with the camera 311, the value on the scale 7 can be recorded and sent to the processor module 8. Among them, the value of the scale 7 gradually decreases along the direction close to the positioning direction. The value measured by the scale 7 is the radial dimension of the blade root of the steam turbine blade. For example, the blade root diameter of the steam turbine blade of the standard part is L mm. When measuring the blade root of the steam turbine blade of the standard part, the value measured by the scale 7 at this time is L mm. When the measured radial dimension of the blade root of the steam turbine blade exceeds the error range, it is determined that the radial dimension of the blade root of the steam turbine blade exceeds the specification range, and the steam turbine blade is manually removed.

[0028] As Figure 6 shown, the rotating member 307 includes: an outer gear ring 3071, which meshes with the rack 5; a ratchet wheel 3072, which is rotatably connected inside the outer gear ring 3071 and is coaxially and fixedly connected to the second transmission wheel 305; a plurality of pawls 3073 are connected to the inner wall of the outer gear ring 3071 and cooperate with the ratchet wheel 3072, and an elastic member 3074 is fixedly connected between the pawl 3073 and the inner wall of the outer gear ring 3071; when the measuring assembly 3 moves towards the positioning seat 2, the rack 5 drives the outer gear ring 3071 to rotate counterclockwise. At this time, the ratchet wheel 3072 remains stationary; when the measuring assembly 3 moves away from the positioning seat 2, the rack 5 drives the outer gear ring 3071 to rotate clockwise. At this time, the rotation of the outer gear ring 3071 drives the ratchet wheel 3072 to rotate, and when the ratchet wheel 3072 rotates, it drives the second transmission wheel 305 to rotate, thereby driving the first transmission wheel 304 and the driving roller 303 to rotate.

[0029] Preferably, a pair of rotating rods 308 are rotatably connected to the pushing frame 302, and a limiting roller 309 is rotatably connected to the rotating rod 308. The two limiting rollers 309 are symmetrically arranged on both sides of the driving roller 303, and a tension spring 310 is fixedly connected between the two rotating rods 308. The two limiting rollers 309 play a role in limiting both sides of the blade root of the steam turbine blade.

[0030] Based on the above measurement device, this embodiment also discloses a method for radially measuring the blade root of a steam turbine blade, including the following steps: Step 1: The conveyor belt 9 conveys the steam turbine blade. When the steam turbine blade moves between the positioning seat 2 and the measuring assembly 3, the conveyor belt 9 stops running; Step 2: The pushing mechanism 4 pushes the measuring assembly 3 to move, so that the driving roller 303 contacts the surface of the blade root of the steam turbine blade, completely moves the blade root of the steam turbine blade into the arc-shaped groove 209, and then the camera 311 captures the value on the scale 7 and sends it to the processor module 8 to complete the first measurement of the radial direction of the blade root of the steam turbine blade; Step 3: The pushing mechanism 4 drives the measuring assembly 3 to return. During the return process, the blade root of the steam turbine blade is tightly clamped between the pressing wheel 202 and the driving roller 303, and the rack 5 drives the rotating member 307 to rotate. When the rotating member 307 rotates, it drives the driving roller 303 to rotate, and the driving roller 303 drives the blade root of the steam turbine blade to rotate 90°, until the measuring assembly 3 returns to its original position; Step 4: The pushing mechanism 4 pushes the measuring assembly 3 to move for the second time, and again completely moves the blade root of the steam turbine blade into the arc-shaped groove 209, and then the camera 311 captures the value on the scale 7 and sends it to the processor module 8 again to complete the second measurement of the radial direction at different positions of the blade root of the steam turbine blade.

[0031] Finally, it should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0032] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A root radial measurement device for a steam turbine blade, characterized in that Including: A measuring table (1) and a conveyor belt (9). There is a groove (10) on the measuring table (1) for the conveyor belt (9) to pass through. The conveyor belt (9) is used to convey steam turbine blades, and a processor module (8) is provided on the measuring table (1); A positioning seat (2) and a measuring assembly (3) are respectively connected to the measuring table (1), and the positioning seat (2) and the measuring assembly (3) are respectively arranged on both sides of the conveyor belt (9); An arc-shaped groove (209) matching the blade root of the steam turbine blade is provided on the side of the positioning seat (2), and a pushing mechanism (4) for driving the measuring assembly (3) to move is installed on the measuring table (1); The measuring assembly (3) includes a sliding seat (301). The pushing mechanism (4) is connected to the sliding seat (301). A slide rail (6) slidably connected to the sliding seat (301) is provided on the measuring table (1). The sliding seat (301) is fixedly connected with a pushing frame (302) for moving the steam turbine blade into the arc-shaped groove (209); A scale (7) is fixedly connected to the measuring table (1). The sliding seat (301) is slidably connected with the scale (7), and a camera (311) is installed on the sliding seat (301) for recording the position of one end of the sliding seat (301) on the scale (7).

2. The root radial measurement device for a steam turbine blade according to claim 1, wherein A vertically arranged driving roller (303) is rotatably connected to the pushing frame (302). The driving roller (303) contacts the blade root of the steam turbine blade. A first transmission wheel (304) is coaxially connected to the driving roller (303). A second transmission wheel (305) is rotatably connected to the pushing frame (302), and a transmission belt (306) is connected between the first transmission wheel (304) and the second transmission wheel (305).

3. The root radial measurement device for a steam turbine blade according to claim 2, characterized in that, A rotating member (307) is coaxially connected to the second transmission wheel (305), and a rack (5) cooperating with the rotating member (307) is fixedly connected to the measuring table (1).

4. The root radial measurement device for a steam turbine blade according to claim 3, characterized in that, The rotating member (307) includes: an external gear ring (3071) meshing with the rack (5); a ratchet wheel (3072) rotatably connected inside the external gear ring (3071) and coaxially and fixedly connected with the second transmission wheel (305); a plurality of pawls (3073) cooperating with the ratchet wheel (3072) are connected to the inner wall of the external gear ring (3071), and an elastic member (3074) is fixedly connected between the pawl (3073) and the inner wall of the external gear ring (3071).

5. The root radial measurement device for a steam turbine blade according to claim 4, characterized in that, A bracket (205) is fixedly connected to the positioning seat (2). A slide bar (203) is fixedly connected to the bracket (205). A pushing block (201) is fixedly connected to one end of the slide bar (203), and an avoidance hole (204) cooperating with the pushing block (201) is provided on the inner wall of the arc-shaped groove (209).

6. The root radial measurement device for a steam turbine blade according to claim 5, characterized in that, A stop block (207) is fixedly connected to the slide bar (203), and a cylindrical spring (206) is connected to the slide bar (203). The cylindrical spring (e206) is arranged between the stop block (207) and the bracket (205), and a limit nut (208) is connected to the end of the slide bar (203).

7. The root radial measurement device for a steam turbine blade according to claim 6, characterized in that, A pair of pressure rollers (202) are rotatably connected to both sides of the pushing block (201).

8. The root radial measurement device for a steam turbine blade according to claim 7, characterized in that, A pair of rotating rods (308) are rotatably connected to the pushing frame (302). A limiting roller (309) is rotatably connected to the rotating rod (308). The two limiting rollers (309) are symmetrically arranged on both sides of the driving roller (303), and a tension spring (310) is fixedly connected between the two rotating rods (308).

9. A method for radially measuring the blade root of a steam turbine blade, using a device for radially measuring the blade root of a steam turbine blade as described in claim 8, characterized in that, It includes the following steps: Step 1: The conveyor belt (9) conveys the steam turbine blade. When the steam turbine blade moves between the positioning seat (2) and the measuring assembly (3), the conveyor belt (9) stops running; Step 2: The pushing mechanism (4) pushes the measuring assembly (3) to move, so that the driving roller (303) contacts the root surface of the steam turbine blade, completely moves the root of the steam turbine blade into the arc-shaped groove (209), and then the camera (311) captures the value on the scale (7) and sends it to the processor module (8) to complete the first measurement of the root radius of the steam turbine blade; Step 3: The pushing mechanism (4) drives the measuring assembly (3) to return. During the return process, the root of the steam turbine blade is tightly clamped between the pressing wheel (202) and the driving roller (303), and the rack (5) drives the rotating member (307) to rotate. When the rotating member (307) rotates, it drives the driving roller (303) to rotate, and the driving roller (303) drives the root of the steam turbine blade to rotate 90°, until the measuring assembly (3) returns to its original position; Step 4: The pushing mechanism (4) pushes the measuring assembly (3) to move for the second time, and again completely moves the root of the steam turbine blade into the arc-shaped groove (209), and then the camera (311) captures the value on the scale ().

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