A kind of water turbine blade wear-resistant coating spraying device for hydroelectric power station

Abstract

The utility model discloses a kind of water turbine blade wear-resistant coating spraying devices of hydropower station, it is related to hydropower station technical field, including impeller shaft, the inner wall of the impeller shaft is provided with adjusting mechanism, adjusting mechanism top is threadedly connected with connecting rod one, connecting rod two, connecting rod one, connecting rod two are away from the end of adjusting mechanism and be rotatably installed with three cross bars, three The cross bar intersection is rotatably installed with connecting column;In the utility model, through the size gradient design of front end spraying rod, middle section spraying rod, tail end spraying rod, it constructs ladder type spraying range, adopts the plasma torch of strip-shaped spout, compared with traditional point-shaped spraying source, line-shaped spraying effect can be produced, spraying area and efficiency are improved, overall coverage from root to end is guaranteed, and through segmented adaptation, the coverage blind area produced by single spraying rod due to size limitation is avoided, the integrity and uniformity of coating are ensured.

Description

Technical Field

[0001] This utility model relates to the field of hydropower station technology, specifically to a spraying device for applying an anti-wear coating to turbine blades in a hydropower station. Background Technology

[0002] In the maintenance and repair of turbine blades in hydropower stations, the application of anti-wear coatings is a key step in extending the service life of the blades and improving the operating efficiency of the unit. The spraying technologies widely used in the industry mainly include arc spraying, plasma spraying, and combustion flame spraying. These technologies all involve heating powdered metal or non-metal materials to a molten or semi-molten state and spraying them onto the pre-treated substrate surface with the help of high-speed flame or compressed air, thereby forming a surface coating with specific functions.

[0003] Plasma spraying technology, due to its extremely high flame temperature, reaching over 10,000°C, can fully melt the spraying material, enabling it to form a metallurgical bond with the substrate, thereby improving the bonding strength and durability of the coating. The plasma spraying process is highly controllable; by adjusting parameters such as plasma gas composition, flow rate, and current, the thickness, composition, and performance of the coating can be precisely controlled to meet the usage requirements under different working conditions.

[0004] However, most existing plasma nozzles are point-spraying sources. During the spraying process, multiple points need to be moved to cover the entire surface of the workpiece in order to achieve the purpose of comprehensive spraying. This spraying method is not only inefficient, but also difficult to meet the needs of efficient and continuous production in large-area spraying tasks. During the overhaul of hydropower station units, the existing point-spraying method restricts the progress and efficiency of spraying operations when facing a large number of worn turbine blades.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] The purpose of this invention is to provide a spraying device for anti-wear coating on turbine blades of hydropower stations, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides a hydropower station turbine blade anti-wear coating spraying device, including an impeller shaft. An adjustment mechanism is provided on the inner wall of the impeller shaft. The top of the adjustment mechanism is threadedly connected to a connecting rod one and a connecting rod two. Three cross rods are rotatably installed at the ends of the connecting rods one and two away from the adjustment mechanism. A connecting column is rotatably installed at the intersection of the three cross rods. A support rod is fixedly installed at the bottom of the three connecting columns. A front spraying rod is fixedly installed at the bottom of the support rod. A front spraying rod is fixedly installed at the bottom of an adjacent connecting column. A tail spraying rod is fixedly installed at the bottom of the other connecting column away from the front spraying rod. The inner walls of the front spraying rod, the middle spraying rod, and the tail spraying rod are all provided with plasma nozzles with strip-shaped nozzles.

[0008] Furthermore, the adjustment mechanism includes a base, a motor 1 is fixedly installed on the bottom of the inner wall of the base, a rotating column is fixedly installed on the drive end of the motor 1, a motor 3 is fixedly installed on the inner side wall of the rotating column, a drive gear is meshed on the drive end of the motor 3, a driven gear is meshed on the side wall of the drive gear, a sleeve is fixedly installed on the top of the driven gear, a slide rod is slidably installed on the inner wall of the sleeve, a connecting shaft is fixedly installed on the top of the slide rod, and the outer wall of the connecting shaft is threadedly connected to the end of the telescopic component.

[0009] Furthermore, the inner wall of the guide rod is provided with a through hole one and a through hole two, which are connected to each other, and an electric wire and a material conveying pipe are passed through the inner wall of the through hole one and the through hole two;

[0010] Blades are fixedly installed on the outer wall of the impeller shaft, and the length of the blades is the same as the length of the telescopic assembly after it is extended.

[0011] Furthermore, a guide rod is rotatably mounted on the top of the adjustment mechanism. The guide rod includes a limiting plate, and a guide groove is provided at the bottom of the limiting plate. The inner wall of the guide groove is slidably connected to the outer wall of the top of the three connecting columns. A clamping plate is elastically mounted on the outer wall of the guide rod, and the side walls of the two clamping plates can clamp and abut against the outer wall of the impeller shaft.

[0012] Furthermore, a second motor is fixedly installed on the inner wall of the rotating column on the side away from the third motor. A screw is meshed with the driving end of the second motor. An internally threaded tube is threadedly connected to the outer wall of the screw. A limit tube is slidably installed on the outer wall of the internally threaded tube. The bottom of the limit tube is fixedly connected to the top of the rotating column.

[0013] Furthermore, the dimensions of the front spray bar, the middle spray bar, and the tail spray bar gradually increase, and there is a spraying distance between the inner wall of the front spray bar, the middle spray bar, and the tail spray bar and the outer wall of the blade.

[0014] The outer wall of the connecting shaft is provided with a threaded groove, and the outer wall of the threaded groove is threadedly connected to the inner wall of the telescopic component.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By designing the size gradient of the front spray bar, middle spray bar, and tail spray bar, a stepped spraying range is constructed. The plasma nozzle with a strip nozzle can produce a linear spraying effect compared with the traditional dot spraying source, which improves the spraying area and efficiency, and ensures full coverage from root to tip. Furthermore, the segmented adaptation avoids the coverage blind spots caused by the size limitation of a single spray bar, ensuring the integrity and uniformity of the coating.

[0017] 2. The adjustment mechanism drives the movement of connecting rod one and connecting rod two through threaded connection, which in turn drives the cross rod and connecting column to move, realizing the extension and retraction of the telescopic component. This allows the spraying rod to reciprocate spraying the outer wall of the blade, further ensuring the uniformity and consistency of the coating thickness. Attached Figure Description

[0018] Figure 1 A schematic diagram of the front structure of a spraying device for applying an anti-wear coating to turbine blades in a hydropower station.

[0019] Figure 2 This is a schematic diagram of the connection structure between the spraying mechanism and the telescopic component of a spraying device for applying an anti-wear coating to turbine blades in a hydropower station.

[0020] Figure 3 A schematic cross-sectional view of the adjustment mechanism of a spraying device for anti-wear coating on turbine blades in a hydropower station.

[0021] Figure 4 This is a schematic diagram of the bottom structure of the guide rod of a spraying device for applying an anti-wear coating to turbine blades in a hydropower station.

[0022] In the diagram: 1. Impeller shaft; 2. Blade; 3. Guide rod; 301. Limiting plate; 302. Guide groove; 303. Through hole one; 304. Through hole two; 305. Clamping plate; 4. Telescopic assembly; 401. Connecting rod one; 402. Connecting rod two; 403. Connecting column; 404. Cross rod; 5. Support rod; 501. Front spraying rod; 502. Middle spraying rod; 503. Tail spraying rod; 6. Adjustment mechanism; 601. Base; 602. Motor one; 603. Rotating column; 604. Motor two; 605. Motor three; 606. Sleeve; 607. Internally threaded tube; 608. Limiting tube; 609. Slide rod; 610. Connecting shaft; 611. Screw; 612. Threaded groove; 613. Driven gear; 614. Drive gear. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in a hydropower station, including an impeller shaft 1. An adjustment mechanism 6 is provided on the inner wall of the impeller shaft 1. The top of the adjustment mechanism 6 is threadedly connected to a connecting rod 401 and a connecting rod 402. Three cross rods 404 are rotatably installed at the ends of the connecting rods 401 and 402 away from the adjustment mechanism 6. A connecting column 403 is rotatably installed at the intersection of the three cross rods 404. A support rod 5 is fixedly installed at the bottom of the three connecting columns 403. A front spraying rod 501 is fixedly installed at the bottom of the support rod 5. A front spraying rod 501 is also fixedly installed at the bottom of the adjacent connecting column 403. A tail spraying rod 503 is fixedly installed at the bottom of the other connecting column 403. A mid-section spraying rod 502 is installed at the corresponding position between 501 and the adjacent connecting column 403. The inner walls of the front spraying rod 501, the mid-section spraying rod 502, and the tail spraying rod 503 are all equipped with plasma nozzles with strip-shaped nozzles. This strip-shaped nozzle design can produce a linear spraying effect, which improves the spraying area and efficiency and reduces the spraying time compared with the traditional dot spraying source. The adjustment mechanism 6 drives the connecting rod 1 401 and the connecting rod 2 402 to move through the threaded connection, which in turn drives the cross rod 404 and the connecting column 403 to move, realizing the extension and retraction of the telescopic component 4. This allows the spraying rod to reciprocate to spray the outer wall of the blade 2, further ensuring the uniformity and consistency of the coating thickness, thereby ensuring the spraying quality while achieving efficient spraying.

[0025] It should be noted that the plasma nozzle with the strip-shaped nozzle is an invention patent with application number: 202222922903.8.

[0026] Please see Figure 4This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in hydropower stations, including an adjusting mechanism 6 with a guide rod 3 rotatably mounted on its top. The guide rod 3 includes a guide groove 302 opened at the bottom of a limiting plate 301 and is slidably connected to the outer wall of the top of three connecting columns 403, providing guidance for the extension, retraction and movement of the spraying rod. A clamping plate 305, which acts as a spring, is elastically installed on the outer wall of the guide rod 3. When the internal threaded tube 607 rises, the clamping plate 305 disengages from the outer wall of the impeller shaft 1. When the internal threaded tube 607 descends, the bottom of the clamping plate 305 slides against the outer wall of the impeller shaft 1 under the action of elastic restoring force and re-clamps, ensuring that the device is stably fixed to the impeller shaft 1 during the spraying operation and ensuring the accuracy of the spraying rod movement.

[0027] Please see Figure 3 This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in a hydropower station, comprising an adjustment mechanism 6 supported by a base 601, with a motor 602 fixedly installed at the bottom of its inner wall driving a rotating column 603 to rotate, so that the entire adjustment mechanism 6 can perform circumferential motion around the impeller shaft 1, thereby realizing continuous spraying of multiple turbine blades 2 and improving spraying efficiency; a second motor 604 drives a screw 611 to rotate, causing an internally threaded tube 607 threadedly connected to the screw 611 to slide on the inner wall of a limiting tube 608, realizing the upward or downward movement of the telescopic component 4; and a third motor 605 drives a sleeve 606 to rotate through the meshing transmission of a drive gear 614 and a driven gear 613, thereby causing a sliding rod 609 to slide on the inner wall of the sleeve 606, and finally realizes the extension and retraction of the telescopic component 4 through a threaded connection between a connecting shaft 610 and the end of the telescopic component 4, achieving flexible spraying coverage of different parts of the blade 2 and ensuring the uniformity and consistency of the coating quality.

[0028] Please see Figure 4 This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in hydropower stations, including a through hole 303 and a through hole 304 on the inner wall of a guide rod 3 that are interconnected to form an internal channel. The wires and material conveying pipes are built into the inside of the guide rod 3 through this channel, eliminating the risk of physical damage caused by accidental collisions or friction, improving the durability and reliability of the pipeline, and providing a solid guarantee for the stable operation of the spraying operation.

[0029] Please see Figure 1This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in hydropower stations, including blades 2 installed on the outer wall of impeller shaft 1 and telescopic components 4 that are coordinated in length. The extended length of the telescopic components 4 is completely matched with that of the blades 2, ensuring that the spraying rod can seamlessly cover the entire surface of the blades 2 during operation, forming a continuous spraying trajectory from the root to the end, completely eliminating the risk of missed spraying in the end or edge areas due to length differences, and providing uniform and complete coating protection for the blades 2.

[0030] Please see Figure 2 This utility model provides a technical solution: a spraying device for anti-wear coating of turbine blades in hydropower stations, including a threaded groove 612 on the outer wall of a connecting shaft 610 that is threadedly connected to the inner wall of a telescopic component 4 to ensure stable transmission of the spraying rod; the front spraying rod 501, the middle spraying rod 502, and the tail spraying rod 503 construct a stepped spraying range through size gradients. The front spraying rod 501 covers the narrow root area of ​​the blade 2, the middle spraying rod 502 adapts to the curvature change in the middle to achieve a continuous transition, and the tail spraying rod 503 treats the wide end area of ​​the blade 2 with a wide structure. The three work together to ensure full coverage from the root to the end, and avoids coverage blind spots caused by the size limitation of a single spraying rod through segmented adaptation. At the same time, the inner wall of each spraying rod maintains a constant spraying distance from the outer wall of the blade 2 to ensure coating uniformity.

[0031] Working principle: The motor 605 in the adjustment mechanism 6 is started. The motor 605 rotates back and forth, and its drive end drives the drive gear 614 to rotate, which in turn drives the driven gear 613 to rotate. The rotation of the driven gear 613 causes the sleeve 606 to rotate, which drives the slide rod 609 to rise or fall, thereby causing the telescopic component 4 to extend and retract. After the telescopic component 4 extends, the strip-shaped plasma nozzles in the front spray rod 501, the middle spray rod 502, and the tail spray rod 503 start to work, heating the powdered metal material to a molten or semi-molten state, and spraying it onto the surface of the blade 2 with the help of a high-speed flame. The motor 605 rotates back and forth, driving the telescopic component 4 to extend and retract, thereby reciprocatingly spraying the outer wall of the blade 2 to ensure uniform coating.

[0032] After one blade 2 is painted, motor 3 605 rotates to retract the telescopic component 4, and starts motor 2 604 in the adjustment mechanism 6. The drive end of motor 2 604 drives screw 611 to rotate, which drives the internal threaded tube 607 and connecting shaft 610 to rise, thereby driving telescopic component 4, support rod 5 and front spraying rod 501, middle spraying rod 502 and tail spraying rod 503 to rise synchronously, leaving the current blade 2, until it rotates to the upper end of the next blade 2. Motor 1 602 stops rotating, motor 2 604 reverses and lowers telescopic component 4, repeating the above painting operation process to paint the next blade 2.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for spraying an anti-wear coating on turbine blades of a hydropower station, comprising an impeller shaft (1), characterized in that: An adjustment mechanism (6) is provided on the inner wall of the impeller shaft (1). The top of the adjustment mechanism (6) is threadedly connected to a connecting rod 1 (401) and a connecting rod 2 (402). Three cross rods (404) are rotatably installed at the ends of the connecting rods 1 (401) and 2 (402) away from the adjustment mechanism (6). A connecting column (403) is rotatably installed at the intersection of the three cross rods (404). A support rod (5) is fixedly installed at the bottom of the three connecting columns (403). The support rod (5) is fixedly installed with a front spraying rod (501) at the bottom. The adjacent connecting column (403) is fixedly installed with a front spraying rod (501) at the bottom. The connecting column (403) away from the front spraying rod (501) is fixedly installed with a tail spraying rod (503) at the bottom. The inner walls of the front spraying rod (501), the middle spraying rod (502), and the tail spraying rod (503) are all provided with plasma nozzles with strip-shaped nozzles.

2. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 1, characterized in that: The top of the adjustment mechanism (6) is rotatably mounted with a guide rod (3). The guide rod (3) includes a limiting plate (301). The bottom of the limiting plate (301) is provided with a guide groove (302). The inner wall of the guide groove (302) is slidably connected to the top outer wall of the three connecting columns (403). The outer wall of the guide rod (3) is elastically mounted with a clamping plate (305). The side walls of the two clamping plates (305) can clamp and abut against the outer wall of the impeller shaft (1).

3. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 2, characterized in that: The adjustment mechanism (6) includes a base (601), a motor (602) is fixedly installed on the bottom of the inner wall of the base (601), a rotating column (603) is fixedly installed on the drive end of the motor (602), a motor (605) is fixedly installed on the inner side wall of the rotating column (603), a drive gear (614) is meshed on the drive end of the motor (605), a driven gear (613) is meshed on the side wall of the drive gear (614), a sleeve (606) is fixedly installed on the top of the driven gear (613), a slide rod (609) is slidably installed on the inner wall of the sleeve (606), a connecting shaft (610) is fixedly installed on the top of the slide rod (609), and the outer wall of the connecting shaft (610) is threadedly connected to the end of the telescopic component (4).

4. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 3, characterized in that: Motor 2 (604) is fixedly installed on the inner wall of the rotating column (603) away from motor 3 (605). The driving end of motor 2 (604) is meshed with screw (611). The outer wall of screw (611) is threaded with internal thread tube (607). Limit tube (608) is slidably installed on the outer wall of internal thread tube (607). The bottom of limit tube (608) is fixedly connected to the top of rotating column (603).

5. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 4, characterized in that: The inner wall of the guide rod (3) is provided with a through hole one (303) and a through hole two (304), and the through hole one (303) and the through hole two (304) are connected to each other. The inner walls of the through hole one (303) and the through hole two (304) are provided with wires and material conveying pipes.

6. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 5, characterized in that: The impeller shaft (1) has blades (2) fixedly installed on its outer wall. The length of the blades (2) is the same as the length of the telescopic assembly (4) after it is extended.

7. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 6, characterized in that: The outer wall of the connecting shaft (610) is provided with a threaded groove (612), and the outer wall of the threaded groove (612) is threadedly connected to the inner wall of the telescopic component (4).

8. The anti-wear coating spraying device for hydropower station turbine blades as described in claim 7, characterized in that: The dimensions of the front spray bar (501), the middle spray bar (502), and the tail spray bar (503) gradually increase, and there is a spraying distance between the inner wall of the front spray bar (501), the middle spray bar (502), and the tail spray bar (503) and the outer wall of the blade (2).

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