A turbine wheel blade root groove grinding and cleaning auxiliary device and method

Abstract

The invention discloses an auxiliary device and method for grinding and cleaning the blade root groove of a turbine wheel disc. The device comprises a guide module, a support module and a grinding module, wherein the guide module is designed to imitate the form of the guide groove, and comprises a front groove body, a front slideway, a front crossbeam, a rear groove body, a rear slideway and a rear crossbeam. The support module is designed to imitate the form of the blade root, and comprises a left tenon and a right tenon. The grinding module is a movable handheld design, and comprises a rotating shaft, a bracket, a handle, a roller brush head and a drive. The guide module is located in the middle of the support module, connected by the front crossbeam and the rear crossbeam, and the grinding module passes through the front slideway and the rear slideway of the guide module through the rotating shaft. The method comprises: inserting the left tenon and the right tenon into the blade root groove; inserting the roller brush head into the rotating shaft, and the rotating shaft is inserted into the front slideway and the rear slideway, and then connecting the bracket and connecting the drive; starting the drive, holding the handle, and grinding the blade root groove along the slideway path. The device and method can realize fast, clean and effective grinding and cleaning of the blade root groove.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a grinding and cleaning auxiliary device and method for turbine wheel blade root grooves. Background Art

[0002] The turbine wheel is one of the core components of the gas turbine. The blade root groove processed in the circumferential direction of the outer periphery of the wheel is the part where the wheel and the turbine blade are assembled. It is generally a fir-tree-shaped groove. It must withstand complex cyclic stress during service, and it is very easy to produce crack defects in the typical part of the blade root groove. At present, there are cases in China where cracks have occurred in the blade root groove of the turbine wheel in service units, which seriously affects the safe and stable operation of the unit. Therefore, the implementation of meticulous and effective non-destructive testing of the blade root groove of the turbine wheel is one of the important contents of gas turbine overhaul and maintenance.

[0003] Among them, array eddy current detection technology has the advantages of large scanning coverage area, high sensitivity, and direct coupling with complex shape parts, which is very suitable for high-precision non-destructive detection of wheel blade root slots. However, during the service process of the turbine wheel blade root slots of in-service gas turbines, surface conditions such as rust and dirt will deteriorate. The deterioration of the surface conditions will produce impedance interference signals and hinder the smooth sliding of the probe, seriously affecting the reliability of the blade root slot array eddy current detection results. The current method is to manually polish with sandpaper or scouring pad on site, but because the blade root slot is fir-tree-shaped and has many concave surfaces, the manual polishing effect is poor, which consumes a lot of manpower and material resources and has poor polishing effect, affecting the reliability of the detection results and the progress of the construction period. Therefore, how to achieve the rapid and effective cleaning of rust, dirt and other deterioration products on the surface before the on-site array eddy current detection of the turbine wheel blade root slot, and ensure the reliability of the blade root slot array eddy current detection results and the progress of the construction period are urgent problems to be solved in the gas turbine turbine wheel blade root slot array eddy current detection. Summary of the invention

[0004] The purpose of the present invention is to provide a turbine wheel blade root groove grinding and cleaning auxiliary device and method to address the problem that the current eddy current detection of the gas turbine turbine wheel blade root groove array is performed manually by using hand-held sandpaper or scouring pad to grind the blade root groove, resulting in poor grinding effect, consuming a large amount of manpower and material resources, and affecting the reliability of the detection results and the progress of the construction period.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A turbine wheel blade root groove grinding and cleaning auxiliary device comprises a guide module, a support module and a grinding module, wherein the guide module comprises a front groove body, a front cross beam, a rear groove body and a rear cross beam, the front groove body is provided with a front slideway, and the rear groove body is provided with a rear slideway; the support module comprises a left tenon and a right tenon; the grinding module comprises a rotating shaft, a bracket, a roller brush head and a drive, the two ends of the rotating shaft are movably connected with the bracket, the rotating shaft is provided with a roller brush head, and the drive is used to drive the rotating shaft to rotate;

[0007] The guide module is located in the middle of the support module and is connected through a front crossbeam and a rear crossbeam. The grinding module passes through the front slideway and the rear slideway of the guide module through a rotating shaft.

[0008] A further improvement of the present invention is that the guide module is designed to imitate the guide groove, the support module is designed to imitate the blade root, and the grinding module is designed to be movable and handheld.

[0009] A further improvement of the present invention is that the front and rear trough bodies of the guide module are designed to be contoured with the blade root groove of the turbine wheel disc being inspected, and their shapes are completely consistent; the front and rear slideways are designed to be contoured with the blade root groove, but their shapes are reduced.

[0010] A further improvement of the present invention is that the circumferential curvature and shape of the support module are consistent with the curvature and shape of the inspected turbine wheel, and the left tenon and the right tenon are designed to imitate the inspected blade root groove and have completely consistent shapes.

[0011] A further improvement of the present invention is that the left tenon and the right tenon are made of transparent plastic material.

[0012] A further improvement of the present invention is that the roller brush head in the grinding module is inserted into the rotating shaft and is driven and connected to one end of the rotating shaft.

[0013] A further improvement of the present invention is that the roller brush head is a scouring pad-like nylon or fiber mesh vertical structure.

[0014] A further improvement of the present invention is that the drive is motor drive or compressed air drive.

[0015] A further improvement of the present invention is that a handle is provided on the bracket.

[0016] A method for grinding and cleaning a turbine wheel blade root groove is provided. The method is based on the above-mentioned device for grinding and cleaning a turbine wheel blade root groove, and comprises the following steps:

[0017] Step 1: Insert the left tenon and the right tenon into the corresponding blade root groove to fix the auxiliary device;

[0018] Step 2: Insert the roller brush head into the shaft, and after the shaft is inserted into the front and rear slideways, connect the brackets at both ends of the shaft, and connect the other end of the shaft to the drive;

[0019] Step 3: Start the drive, hold the handle, grind the blade root groove along the slide path, then move to the next blade root groove, repeat the above steps 1, 2, and 3 to complete the grinding and cleaning of all blade root grooves one by one.

[0020] The present invention has at least the following beneficial technical effects:

[0021] The present invention provides a turbine wheel blade root groove grinding and cleaning auxiliary device and method, the device and method can realize the rapid, clean and effective grinding and cleaning of the turbine wheel blade root groove array before eddy current detection, avoiding the current use of hand-held scouring pads or sandpaper to grind the blade root groove, which has poor grinding effect, consumes a lot of manpower and material resources, and affects the reliability of the detection result and the limitations of the construction schedule. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of a turbine wheel blade root groove grinding and cleaning auxiliary device and method.

[0023] Description of reference numerals:

[0024] 1. Guide module, 2. Support module, 3. Grinding module.

[0025] 101. front trough body, 102. front slideway, 103. front crossbeam, 104. rear trough body, 105. rear slideway, 106. rear crossbeam; 201. left tenon, 202. right tenon; 301. rotating shaft, 302. bracket, 303. handle, 304. roller brush head, 305. drive. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0027] Refer to the attached Figure 1 The present invention provides a turbine wheel blade root groove grinding and cleaning auxiliary device, comprising a guide module 1, a support module 2 and a grinding module 3, wherein the guide module 1 is designed to imitate the form of the guide groove, including a front groove body 101, a front slide 102, a front crossbeam 103, a rear groove body 104, a rear slide 105 and a rear crossbeam 106. The support module 2 is designed to imitate the form of the blade root, including a left tenon 201 and a right tenon 202. The grinding module 3 is a movable handheld design, including a rotating shaft 301, a bracket 302, a handle 303, a roller brush head 304 and a drive 305. The guide module 1 is located in the middle of the support module 2, connected by the front crossbeam 103 and the rear crossbeam 106, and the grinding module 3 is inserted into the front slide 102 and the rear slide 105 of the guide module 1 through the rotating shaft 301.

[0028] The present invention provides a turbine wheel blade root groove grinding and cleaning auxiliary method, comprising the following steps:

[0029] Step 1: Insert the left tenon 201 and the right tenon 202 into the corresponding blade root groove to fix the auxiliary device. Step 2: Insert the roller brush head 304 into the rotating shaft 301. After the rotating shaft 301 is inserted into the front slideway 102 and the rear slideway 105, the two ends of the rotating shaft 301 are connected to the bracket 302, and the other end of the rotating shaft 301 is connected to the drive 305.

[0030] Step 3: Start the driver 305, hold the handle 303, grind the blade root groove along the slide path, then turn to the next blade root groove, repeat the first, second and third steps, and complete the grinding and cleaning of all blade root grooves one by one.

[0031] The front trough 101 and the rear trough 104 of the guide module 1 are designed to be in the same shape as the blade root groove of the turbine wheel disc to be inspected. The same shape of the trough ensures that all parts of the blade root groove can be effectively polished and cleaned. The front slide 102 and the rear slide 105 are also designed to be in the same shape as the blade root groove, but the shape is reduced. The reduced design reserves space for the roller brush head to rotate and avoid jamming.

[0032] The circumferential curvature and shape of the support module 2 are consistent with the curvature and shape of the inspected turbine wheel disc. The consistent curvature design ensures that the support module can be inserted exactly into the blade root groove of the in-service turbine wheel disc. The left tenon 201 and the right tenon 202 are designed to imitate the blade root groove of the inspected blade, and the shape is completely consistent. The imitation and left and right double support design ensure the stability of the auxiliary device and ensure the grinding and cleaning effect.

[0033] The left tenon 201 and the right tenon 202 are made of transparent plastic material, which can avoid wear and damage to the blade root groove in service and allow the surface condition of the blade root groove to be observed.

[0034] The roller brush head 304 in the grinding module 3 is inserted into the rotating shaft 301, and the two ends of the rotating shaft 301 are fixed on the two ends of the bracket 302. The drive 305 is connected to one end of the rotating shaft 301. The design of fixing the two ends on the bracket avoids the shaking of the rotating shaft 301 that occurs when a single end is fixed, which makes it difficult to grind along the predetermined groove.

[0035] The roller brush head 304 is a scouring pad-like nylon or fiber mesh vertical structure, which will not damage the blade root groove substrate being inspected while ensuring that rust, dirt, etc. in the blade root groove are effectively removed.

[0036] The drive 305 can be driven by a motor or a compressed air. The motor drive or the compressed air drive is convenient for access at the maintenance site, thereby improving the on-site adaptability of the device.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A turbine wheel blade root groove grinding and cleaning auxiliary device, characterized in that: The invention comprises a guide module (1), a support module (2) and a polishing module (3), wherein the guide module (1) comprises a front trough body (101), a front crossbeam (103), a rear trough body (104) and a rear crossbeam (106), wherein the front trough body (101) is provided with a front slideway (102), and the rear trough body (104) is provided with a rear slideway (105); the support module (2) comprises a left tenon (201) and a right tenon (202); the polishing module (3) comprises a rotating shaft (301), a bracket (302), a roller brush head (304) and a drive (305), wherein both ends of the rotating shaft (301) are movably connected to the bracket (302), the rotating shaft (301) is provided with a roller brush head (304), and the drive (305) is used to drive the rotating shaft (301) to rotate; The guide module (1) is located in the middle of the support module (2) and is connected via a front crossbeam (103) and a rear crossbeam (106); the polishing module (3) is inserted into the front slideway (102) and the rear slideway (105) of the guide module (1) via a rotating shaft (301).

2. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The guide module (1) is designed to imitate the guide groove of the form, the support module (2) is designed to imitate the blade root of the form, and the grinding module (3) is designed to be movable and handheld.

3. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The front slot body (101) and the rear slot body (104) of the guide module (1) are designed to imitate the blade root slot of the inspected turbine wheel disc, and their shapes are completely consistent; the front slideway (102) and the rear slideway (105) are designed to imitate the blade root slot, but the shapes are designed to be smaller.

4. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The circumferential curvature and shape of the support module (2) are consistent with the curvature and shape of the inspected turbine wheel disc, and the left tenon (201) and the right tenon (202) are designed to imitate the inspected blade root groove and have completely consistent shapes.

5. The turbine blade root groove grinding and cleaning auxiliary device according to claim 4, characterized in that: The left tenon (201) and the right tenon (202) are made of transparent plastic material.

6. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The rolling brush head (304) in the polishing module (3) is inserted into the rotating shaft (301), and the driving (305) is connected to one end of the rotating shaft (301).

7. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The roller brush head (304) is a scouring pad-like nylon or fiber mesh vertical structure.

8. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The drive (305) is driven by a motor or compressed air.

9. The turbine blade root groove grinding and cleaning auxiliary device according to claim 1, characterized in that: The bracket (302) is provided with a handle (303).

10. A turbine blade root groove grinding and cleaning auxiliary method, characterized in that: The method is based on a turbine wheel blade root groove grinding and cleaning auxiliary device according to any one of claims 1 to 9, and comprises the following steps: The first step: inserting the left tenon (201) and the right tenon (202) into the corresponding blade root groove to fix the auxiliary device; Step 2: insert the roller brush head (304) into the rotating shaft (301), and after the rotating shaft (301) is inserted into the front slideway (102) and the rear slideway (105), the two ends of the rotating shaft (301) are connected to the bracket (302), and the other end of the rotating shaft (301) is connected to the drive (305); Step 3: Start the drive (305), hold the handle (303), polish the blade root groove along the slide path, then turn to the next blade root groove, repeat the first, second and third steps, and complete the polishing and cleaning of all blade root grooves one by one.

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