A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine

Abstract

This utility model relates to the field of turbine last-stage blade processing technology, and discloses a positioning fixture for applying a waterproof and erosion-resistant coating to turbine last-stage blades. The fixture includes a frame, with two symmetrical side guide rails fixedly connected between the inner walls of both sides of the frame. Multiple sliding frames are slidably connected to the side guide rails via sliding sleeves. A second drive motor is fixedly connected to one side of each sliding frame, and a fixing component for clamping the blade is provided at the end of the second drive motor. A fixing box is fixedly connected to one end of the top and bottom inner walls of the frame. This utility model, by setting the blade clamping fixing component on a slidable sliding frame, allows the fixing component to be moved to the outside of the frame before and after spraying, facilitating installation and disassembly by workers. Furthermore, when cleaning, maintenance, or replacement of parts is required, the sliding frame can be easily moved to an easily operable position, improving the maintainability of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of turbine last-stage blade processing technology, and more specifically to a positioning fixture for applying a waterproof and erosion-resistant coating to turbine last-stage blades. Background Technology

[0002] Steam turbines are the core equipment of modern thermal power generation, nuclear power generation and large ship propulsion systems. Their last-stage blades operate at the end of high-temperature and high-pressure steam expansion, in the wet steam zone, and are subjected to huge centrifugal stress, airflow excitation force and the most severe water erosion. Water droplets contained in the high-speed steam continuously impact the steam inlet edge of the blades, leading to material fatigue and damage, which seriously affects the aerodynamic performance, operating efficiency, safety and reliability and service life of the blades.

[0003] However, existing coating processes, especially for large final-stage blades that are one to several meters long, typically involve installing the blades into a frame before spraying. However, due to the large size of the blades and the limited space within the spray frame, installing and removing the blades is difficult and affects processing efficiency. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, this utility model provides a positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine, so as to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: a positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine, comprising a frame, two symmetrical side guide rails fixedly connected between the inner walls of both sides of the frame, a sliding frame slidably connected to a plurality of the side guide rails via sliding sleeves, a second drive motor fixedly connected to one side of the sliding frame, a fixing component for clamping the blades provided at the end of the second drive motor, a fixing box fixedly connected to one end of the top inner wall and the bottom inner wall of the frame, the distance between the two fixing boxes being slightly greater than the height of the sliding frame, a limiting component for limiting the position of the sliding frame provided on the lower fixing box, and a spraying component for spraying the blades provided between the frame and the upper fixing box.

[0006] As a further embodiment of this utility model, the fixing component includes a connecting plate fixedly connected to the end of the second output shaft of the drive motor, a lower clamping block fixedly connected to one side of the connecting plate, and an upper clamping block fixedly connected to the lower clamping block.

[0007] As a further embodiment of this utility model, the lower clamping block and the upper clamping block are provided with contoured grooves on their opposite sides, which are the same shape as the root portion of the last stage blade of the steam turbine.

[0008] As a further embodiment of this utility model, the limiting component includes an L-shaped rod fixedly connected to one side of the slide frame, the L-shaped rod having a pin hole, and an electromagnetic pin that cooperates with the pin hole is fixedly connected to the outer wall of the top of the fixing box located below.

[0009] As a further embodiment of this utility model, the spraying assembly includes a top guide rail fixedly connected between the frame and the outer wall of one side of the upper fixed box. A slide is slidably connected to the top guide rail via a sliding sleeve. The bottom of the slide is provided with a spray nozzle for spraying paint, and the spray nozzle is connected to external spraying equipment through a pipe.

[0010] As a further embodiment of this utility model, a lead screw is rotatably connected between one side of the frame and the outer wall of the upper fixed box via a bearing seat. The lead screw passes through the slide and is threadedly connected to the threaded cylinder on the slide. A drive motor for rotating the lead screw axially is fixedly connected to one side of one of the bearing seats.

[0011] As a further embodiment of this utility model, each of the two fixed boxes has a strip-shaped opening on its opposite sidewall, and opposing sliding plates are slidably connected in the two strip-shaped openings to separate the drive motor from the painting space. An electric push rod is fixedly connected between the inner wall of the other side of the fixed box and the sliding plate.

[0012] As a further embodiment of this utility model, the opposite sides of the sliding plate are provided with clearance slots to allow the connecting plate to be positioned.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. This utility model sets the fixing component for clamping the blade on a sliding frame, which can be moved to the outside of the frame before and after spraying, making it convenient for workers to install and disassemble. Moreover, when it is necessary to clean, repair or replace parts, the sliding frame can be easily moved to an easy-to-operate position, improving the maintainability of the equipment.

[0015] 2. This utility model achieves rapid, precise and non-destructive clamping of the blade by setting a contour groove that perfectly matches the shape of the blade root and securing it with upper and lower clamping blocks, ensuring that the blade will not shift or loosen during subsequent spraying.

[0016] 3. The sliding plate structure driven by the electric push rod of this utility model completely isolates the front spraying area from the rear drive motor and other precision transmission components before spraying. The design of the notch not only ensures the smooth passage of the connecting plate, but also achieves effective sealing, prevents paint droplet splashing, protects the core drive equipment, reduces maintenance frequency, and significantly extends the service life of the entire fixture. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front three-dimensional structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the rear three-dimensional structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the sliding frame structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the fixing box of this utility model.

[0021] The attached diagram is labeled as follows: 1. Frame; 2. Side guide rail; 3. Top guide rail; 4. Carriage; 5. Lead screw; 6. Drive motor one; 7. Slide frame; 8. Fixing box; 9. Nozzle; 10. Drive motor two; 11. Connecting plate; 12. Lower clamping block; 13. Contouring groove; 14. Upper clamping block; 15. L-shaped rod; 16. Pin hole; 17. Electromagnetic pin; 18. Electric push rod; 19. Strip-shaped opening; 20. Slide plate; 21. Alternating notch. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Reference Figures 1-4 This utility model provides a positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine. It includes a frame 1, with two symmetrical side guide rails 2 bolted between the inner walls of both sides of the frame 1. Multiple side guide rails 2 are slidably connected to sliding frames 7 via sliding sleeves. A second drive motor 10 is bolted to one side of the sliding frame 7. The end of the second drive motor 10 is equipped with a fixing component for clamping the blades. One end of the top and bottom inner walls of the frame 1 is bolted to a fixing box 8. The distance between the two fixing boxes 8 is slightly greater than the height of the sliding frame 7. The lower fixing box 8 is equipped with a limiting component that restricts the position of the sliding frame 7. A spraying component for spraying the blades is located between the frame 1 and the upper fixing box 8.

[0024] It should be noted that the drive motor 210 is existing technology, which is a servo motor with an encoder. The number of rotations and rotation angle of the motor output shaft are controllable and have high precision. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0025] By setting the fixing component for clamping the blades on the sliding frame 7, the fixing component can be moved to the outside of the frame 1 before and after spraying, which facilitates the installation and disassembly by the staff. Moreover, when it is necessary to clean, repair or replace parts, the sliding frame 7 can be easily moved to an easy-to-operate position, which improves the maintainability of the equipment.

[0026] In this utility model, the fixing component includes a connecting plate 11 that is fixedly connected to the end of the output shaft of the drive motor 10 by bolts. A lower clamping block 12 is fixedly connected to one side of the connecting plate 11 by bolts, and an upper clamping block 14 is fixedly connected to the lower clamping block 12 by bolts.

[0027] Furthermore, the lower clamping block 12 and the upper clamping block 14 are provided with contoured grooves 13 that are the same shape as the root part of the last stage blade of the steam turbine.

[0028] In the initial preparation and blade clamping, first move the sliding frame 7 to the side of the frame 1 away from the fixed box 8. Then place the root part of the turbine's last stage blade into the contour groove 13 of the lower clamping block 12 of the fixed assembly. Then, close the upper clamping block 14 and tighten it with bolts, so that the blade root is accurately and firmly clamped in the contour space formed by the upper clamping block 14 and the lower clamping block 12. At this time, the blade is connected to the output shaft of the second drive motor 10 through the connecting plate 11.

[0029] By setting a contour groove 13 that perfectly matches the shape of the blade root, and securing it with an upper clamping block 14 and a lower clamping block 12, the blade is quickly, accurately, and without damage, ensuring that the blade will not shift or loosen during subsequent spraying.

[0030] In this utility model, the limiting component includes an L-shaped rod 15 that is fixedly connected to one side of the slide frame 7 by bolts. The L-shaped rod 15 has a pin hole 16. An electromagnetic pin 17 (the electromagnetic pin 17 model is: PADA5442 cylindrical head electromagnetic lock) is fixedly connected to the top outer wall of the fixed box 8 located below by bolts.

[0031] When the slide frame 7 is precisely positioned, after the blade is clamped, the slide frame 7 slides along the side guide rails 2 fixed on both sides of the frame 1 toward the fixed box 8. When the slide frame 7 moves to the predetermined spraying station, the L-shaped rod 15 on its side also reaches the position of the electromagnetic pin 17 on the fixed box 8 below. The electromagnetic pin 17 extends and is precisely inserted into the pin hole 16 of the L-shaped rod 15.

[0032] In this utility model, the spraying assembly includes a top guide rail 3 that is fixedly connected by bolts between the frame 1 and the outer wall of the fixed box 8 above the position. A slide 4 is slidably connected to the top guide rail 3 by a sliding sleeve. The bottom of the slide 4 is provided with a spray nozzle 9 for spraying paint, and the spray nozzle 9 is connected to an external spraying equipment through a pipe.

[0033] During the spraying operation, the drive motor 6 starts, driving the lead screw 5 to rotate. The slide 4, which is connected to the lead screw 5 by a thread, begins to move smoothly in a straight line along the length of the blade under the constraint of the top guide rail 3. The nozzle 9, fixed on the slide 4, sprays the paint from the external pipe evenly onto the surface of the blade during the movement. At the same time, the drive motor 10 can rotate slowly, driving the clamped blade to rotate around its axis, achieving all-round, no-dead-angle spraying.

[0034] Furthermore, a lead screw 5 is rotatably connected between one side of the frame 1 and the outer wall of the upper fixed box 8 via a bearing seat. The lead screw 5 passes through the slide 4 and is threadedly connected to the threaded cylinder on the slide 4. A drive motor 6 that causes the lead screw 5 to rotate axially is fixedly connected to one side of one of the bearing seats by bolts.

[0035] It should be noted that the drive motor 6 is existing technology, which is a servo motor with an encoder. The number of rotations and rotation angle of the motor output shaft are controllable and have high precision. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0036] In this utility model, each of the two fixed boxes 8 pairs has a strip-shaped opening 19 on its opposite side wall. The two strip-shaped openings 19 are slidably connected to opposing slide plates 20, which are used to separate the drive motor 10 from the painting space. An electric push rod 18 is fixedly connected to the inner wall of the other side of the fixed box 8 and the slide plate 20 by bolts.

[0037] It should be noted that the electric push rod 18 is existing technology and can be used with magnetic switches, proximity switches or photoelectric switches to achieve precise control of the push rod's extension and retraction displacement. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0038] Furthermore, the opposite sides of the sliding plate 20 are provided with clearance slots 21 to avoid the connecting plate 11.

[0039] The slide plate 20 structure driven by the electric push rod 18 completely isolates the front spraying area from the precision transmission components such as the drive motor 2 10 behind before spraying. The design of the clearance notch 21 not only ensures the smooth passage of the connecting plate 11, but also achieves effective sealing, preventing paint droplet splashing, protecting the core drive equipment, reducing maintenance frequency, and significantly extending the service life of the entire fixture.

[0040] After the slide frame 7 is positioned, the electric push rod 18 located in the upper and lower fixed boxes 8 starts to work, pushing the slide plate 20 to slide and close along the strip opening 19. The two slide plates 20 are finally closed, and the clearance notch 21 on it just surrounds the connecting plate 11, completely isolating the air inlet edge area of ​​the blade to be sprayed from the precision equipment such as the drive motor 2 10 behind.

[0041] After the spraying is completed, the nozzle 9 stops working and resets. The electric push rod 18 retracts and drives the slide plate 20 to open. The electromagnetic pin 17 is de-energized and retracts to release the lock on the slide frame 7. The slide frame 7 moves along the side guide rail 2 away from the fixed box 8. The blade and the fixing components are moved to the outside of the frame 1. Then, the upper clamping block 12 and the lower clamping block 14 are released to remove the sprayed blade and prepare to clamp the next blade.

[0042] The use of this utility model involves the following steps:

[0043] S1: Initial preparation and blade clamping. First, move the sliding frame 7 to the side of the frame 1 away from the fixed box 8. Then, place the root part of the turbine's last stage blade in the contour groove 13 of the lower clamping block 12 of the fixed assembly. Then, close the upper clamping block 14 and tighten it with bolts so that the blade root is accurately and firmly clamped in the contour space formed by the upper clamping block 14 and the lower clamping block 12. At this time, the blade is connected to the output shaft of the second drive motor 10 through the connecting plate 11.

[0044] S2: When the slide frame 7 is precisely positioned, after the blade is clamped, the slide frame 7 slides along the side guide rails 2 fixed on both sides of the frame 1 toward the fixed box 8. When the slide frame 7 moves to the predetermined spraying station, the L-shaped rod 15 on its side also reaches the position of the electromagnetic pin 17 on the fixed box 8 below. The electromagnetic pin 17 extends and is precisely inserted into the pin hole 16 of the L-shaped rod 15.

[0045] S3: After the sliding frame 7 is positioned, the electric push rod 18 located in the upper and lower fixed boxes 8 starts to work, pushing the slide plate 20 to slide and close along the strip opening 19. The two slide plates 20 are finally closed, and the clearance notch 21 on it just surrounds the connecting plate 11, completely isolating the air inlet side area of ​​the blade to be sprayed from the precision equipment such as the drive motor 2 10 behind.

[0046] S4: Spraying operation. During spraying, drive motor 6 starts and drives lead screw 5 to rotate. The slide 4, which is connected to lead screw 5 by a thread, begins to move smoothly in a straight line along the length of the blade under the constraint of the top guide rail 3. The nozzle 9, which is fixed on the slide 4, sprays the paint from the external pipe evenly onto the surface of the blade during the movement. At the same time, drive motor 10 can rotate slowly, driving the clamped blade to rotate around its axis, so as to spray in all directions without dead angles.

[0047] S5: After the spraying is completed, the nozzle 9 stops working and resets. The electric push rod 18 retracts and drives the slide plate 20 to open. The electromagnetic pin 17 is de-energized and retracts to release the lock on the slide frame 7. The slide frame 7 moves along the side guide rail 2 away from the fixed box 8. The blade and the fixing assembly are moved to the outside of the frame 1. Then, the upper clamping block 12 and the lower clamping block 14 are released to remove the sprayed blade and prepare to clamp the next blade.

[0048] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0049] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0050] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine, comprising a frame (1), characterized in that: Two symmetrical side guide rails (2) are fixedly connected between the inner walls of both sides of the frame (1). A sliding frame (7) is slidably connected to the multiple side guide rails (2) through a sliding sleeve. A second drive motor (10) is fixedly connected to one side of the sliding frame (7). A fixing component for clamping the blade is provided at the end of the second drive motor (10). A fixing box (8) is fixedly connected to one end of the top inner wall and the bottom inner wall of the frame (1). The distance between the two fixing boxes (8) is slightly greater than the height of the sliding frame (7). A limiting component for limiting the position of the sliding frame (7) is provided on the lower fixing box (8). A spraying component for spraying the blade is provided between the frame (1) and the upper fixing box (8).

2. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 1, characterized in that: The fixing component includes a connecting plate (11) fixedly connected to the end of the output shaft of the second drive motor (10), a lower clamping block (12) fixedly connected to one side of the connecting plate (11), and an upper clamping block (14) fixedly connected to the lower clamping block (12).

3. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 2, characterized in that: The lower clamping block (12) and the upper clamping block (14) are provided with a contoured groove (13) that is the same shape as the root part of the last stage blade of the steam turbine.

4. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 1, characterized in that: The limiting component includes an L-shaped rod (15) fixedly connected to one side of the slide frame (7), and a pin hole (16) is provided on the L-shaped rod (15). An electromagnetic pin (17) that cooperates with the pin hole (16) is fixedly connected to the top outer wall of the fixing box (8) located below.

5. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 1, characterized in that: The spraying assembly includes a top guide rail (3) fixedly connected between the frame (1) and the outer wall of the upper fixed box (8) on one side. A carriage (4) is slidably connected to the top guide rail (3) via a sliding sleeve. A spray nozzle (9) for spraying paint is provided at the bottom of the carriage (4), and the spray nozzle (9) is connected to an external spraying equipment through a pipe.

6. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 5, characterized in that: A lead screw (5) is rotatably connected between one side of the frame (1) and the outer wall of the upper fixed box (8) via a bearing seat. The lead screw (5) passes through the slide (4) and is threadedly connected to the threaded cylinder on the slide (4). A drive motor (6) that causes the lead screw (5) to rotate axially is fixedly connected to one side of one of the bearing seats.

7. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 1, characterized in that: Each of the two fixed boxes (8) has a strip-shaped opening (19) on its opposite sidewall. The two strip-shaped openings (19) are slidably connected to opposing sliding plates (20) to separate the drive motor (10) from the painting space. An electric push rod (18) is fixedly connected between the inner wall of the other side of the fixed box (8) and the sliding plate (20).

8. A positioning fixture for applying a waterproof and erosion-resistant coating to the last stage blades of a steam turbine according to claim 7, characterized in that: The sliding plate (20) has a clearance slot (21) on each of its opposite sides to allow the connecting plate (11) to be positioned.

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