A device for overhauling a steam turbine blade

Abstract

This invention relates to the field of steam turbine technology, and more specifically, to a device for steam turbine blade maintenance. It includes a positioning plate, a clamping and fixing assembly, an L-shaped mounting bracket, a pulling assembly, a top support assembly, and a top support adjustment assembly. The positioning plate is a flat plate with vertically arranged slots. The clamping and fixing assembly is mounted on the positioning plate through these slots. The device is fixed to the steam turbine blade through the cooperation of the positioning plate and the clamping and fixing assembly. Two sets of L-shaped mounting brackets are symmetrically arranged on the positioning plate. The pulling assembly is connected to the L-shaped mounting bracket, and the top support assembly is hinged to the pulling assembly. One end of the top support assembly abuts against the steam turbine blade, and the other end is connected to the end of the pulling assembly away from the positioning plate via the top support adjustment assembly. The components of this device work together to achieve stable fixation and flexible adjustment of blade spacing during steam turbine maintenance. This invention is mainly applied to the maintenance of steam turbine blades.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically, to a device for steam turbine blade maintenance. Background Technology

[0002] Steam turbines are core power equipment in energy sectors such as thermal power generation and nuclear power. Their blades operate under conditions of high temperature, high pressure, and high-speed rotation for extended periods, making them prone to defects such as wear, deformation, cracks, and scale buildup. Regular inspection and maintenance are necessary. Steam turbine blades have a compact structure, are densely packed, and have narrow blade gaps. Traditional maintenance methods, such as manual prying and temporary supports, often involve adjusting blade positions, which has the following technical drawbacks: During maintenance, disassembling blades is a labor-intensive and time-consuming task, resulting in low maintenance efficiency. The lack of dedicated maintenance equipment and the reliance on temporary fixing methods can lead to loosening and displacement, failing to provide a stable operating benchmark for maintenance work and posing safety hazards. Manual prying and jacking operations cannot precisely control the pulling and jacking forces, which can easily cause secondary deformation and stress damage to the blades, or even serious accidents such as blade breakage. Existing devices are mostly customized for specific turbine models and cannot be adapted to blades of different specifications and installation heights, nor can they flexibly adjust the working height and angle, limiting their applicability. Traditional jacking structures are prone to causing damage to the blade surface. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a device for turbine blade maintenance. To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A device for overhauling steam turbine blades includes a positioning plate, a clamping and fixing assembly, an L-shaped mounting bracket, a pulling assembly, a top support assembly, and a top support adjustment assembly. The positioning plate is a flat plate with a vertically arranged slot. The clamping and fixing assembly is mounted on the positioning plate through the slot. The device is fixed to the steam turbine blade through the cooperation of the positioning plate and the clamping and fixing assembly. Two sets of L-shaped mounting brackets are symmetrically arranged on the positioning plate. The pulling assembly is connected to the L-shaped mounting bracket. The top support assembly is hinged to the pulling assembly. One end of the top support assembly abuts against the steam turbine blade, and the other end is connected to the end of the pulling assembly away from the positioning plate through the top support adjustment assembly.

[0004] The clamping and fixing assembly includes a bolt, a fixing clip, and an adjusting turntable. The bolt passes through the strip groove, the fixing clip is movably mounted on the bolt, and the adjusting turntable is threaded onto the bolt. The adjusting turntable limits the position of the fixing clip, and the device is fixed to the steam turbine by the positioning plate and the fixing clip.

[0005] The positioning plate has multiple sets of mounting slots symmetrically opened at different heights. The L-shaped mounting bracket is set on the positioning plate through the mounting slots. According to the maintenance position, the L-shaped mounting bracket is set in the mounting slots at different heights.

[0006] The positioning plate is provided with a lifting handle, which is vertically set on the surface of the positioning plate. When installing and positioning the positioning plate, the operator controls the positioning plate by lifting the handle.

[0007] The pulling assembly includes a movable shaft, a movable rod, a first movable plate, and a first rotating shaft. The movable shaft is rotatably mounted on the L-shaped mounting bracket. The movable rod passes through the movable shaft. The bottom of the movable rod is fixedly connected to the first rotating shaft. The first movable plate is fixedly connected to the first rotating shaft.

[0008] The top support assembly includes a top support rod, a second movable plate, and a second rotating shaft. The second rotating shaft is rotatably connected to the first rotating shaft, and the second movable plate is fixedly connected to the second rotating shaft. The top support rod passes through the second rotating shaft and can rotate synchronously with the second rotating shaft.

[0009] The top support rod is provided with a top support foot at one end near the turbine blade.

[0010] The top support adjustment assembly includes an adjusting screw, a movable collar, a spring, and a rotating adjusting block. The bottom of the adjusting screw is hinged to the end of the second movable plate away from the second rotating shaft. The movable collar is fixedly disposed at the end of the first movable plate away from the first rotating shaft. The adjusting screw passes through the movable collar. The rotating adjusting block is threadedly connected to the adjusting screw. The spring is sleeved on the outside of the adjusting screw between the movable collar and the rotating adjusting block. The movable collar and the rotating adjusting block limit the movement of the spring.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This device eliminates the need for blade disassembly during maintenance, allowing for direct online maintenance on the turbine rotor. This significantly improves maintenance efficiency and greatly reduces the workload of maintenance personnel. The positioning plate works in conjunction with the clamping and fixing components, using a slotted groove to adjust the clamping position vertically. Rotating the adjustment turntable enables bidirectional clamping without modifying the turbine itself, achieving non-destructive and rapid installation. Two sets of L-shaped mounting brackets are symmetrically arranged to ensure even force distribution, preventing structural deformation and loosening caused by unilateral stress. The rotating top support adjustment component drives the top support rod and top support feet. The top-support blades, with increased blade spacing, meet the operational requirements for top-support opening. The spring's cushioning effect avoids rigid impact, effectively protecting the blades from damage. Multiple mounting slots on the positioning plate form a multi-level height adjustment structure, allowing flexible adjustment of the L-shaped mounting bracket, pulling assembly, and top-support assembly height according to the blade maintenance location. The lifting handle facilitates device handling, installation, and positioning, and can also be used as a hoisting point for high-altitude operations. Each adjustment component is simple to operate, requiring no complex tools. A single person can complete device installation, force adjustment, and maintenance, significantly reducing labor intensity and improving maintenance efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from another angle; Figure 3 This is a front view of the present invention; Figure 4 This is a schematic diagram of the installation of the present invention; In the diagram: 1 is the positioning plate, 2 is the bolt, 3 is the fixing clip, 4 is the adjusting turntable, 5 is the strip groove, 6 is the lifting handle, 7 is the mounting groove, 8 is the L-shaped mounting bracket, 9 is the movable shaft, 10 is the movable rod, 11 is the first movable plate, 12 is the first rotating shaft, 13 is the top support rod, 14 is the top support foot, 15 is the second movable plate, 16 is the second rotating shaft, 17 is the adjusting screw, 18 is the movable collar, 19 is the spring, and 20 is the rotating adjusting block. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0014] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0015] like Figures 1 to 4As shown, a device for overhauling steam turbine blades includes a positioning plate 1, a clamping and fixing assembly, an L-shaped mounting bracket 8, a pulling assembly, a top support assembly, and a top support adjustment assembly. The positioning plate 1 is a flat plate with a strip groove 5 vertically arranged on it. The clamping and fixing assembly is mounted on the positioning plate 1 through the strip groove 5. The device is fixed to the steam turbine blade through the cooperation of the positioning plate 1 and the clamping and fixing assembly. Two sets of L-shaped mounting brackets 8 are symmetrically arranged on the positioning plate 1. The pulling assembly is connected to the L-shaped mounting bracket 8, and the top support assembly is hinged to the pulling assembly. One end of the top support assembly abuts against the steam turbine blade, and the other end is connected to the end of the pulling assembly away from the positioning plate 1 through the top support adjustment assembly.

[0016] The positioning plate 1 is the carrier of the device and is made of high-strength steel plate. The vertical strip groove 5 provides an adjustable track for the clamping and fixing components to adapt to turbine structures with different installation heights. The two sets of L-shaped mounting brackets 8 are symmetrically arranged to ensure uniform force distribution. The pulling component and the top support component are hinged to form a linkage lever structure. The pulling force and the top support force can be precisely controlled through the top support adjustment component to meet the pulling reset and top support positioning requirements of blade maintenance.

[0017] Preferably, the clamping and fixing assembly includes a bolt 2, a fixing clamp 3, and an adjusting turntable 4. The bolt 2 passes through the strip groove 5, the fixing clamp 3 is movably mounted on the bolt 2, and the adjusting turntable 4 is threaded onto the bolt 2. The adjusting turntable 4 limits the position of the fixing clamp 3, and the device is fixed to the steam turbine by the positioning plate 1 and the fixing clamp 3. The bolt 2 can slide up and down along the strip groove 5 to adjust the clamping position. The fixing clamp 3 is adapted to the blade structure to increase the contact area. Rotating the adjusting turntable 4 can push the clamp and the positioning plate 1 to form a bidirectional clamping, realizing the rapid and non-destructive fixing of the device. The adjusting turntable has an anti-slip structure, making operation convenient and clamping stable.

[0018] Preferably, the positioning plate 1 has multiple sets of mounting slots 7 symmetrically formed at different heights. The L-shaped mounting bracket 8 is set on the positioning plate 1 through the mounting slots 7. According to the maintenance position, the L-shaped mounting bracket 8 is set in the mounting slots 7 at different heights. The multiple sets of mounting slots 7 form a multi-level height adjustment structure. The L-shaped mounting bracket 8 can be disassembled and assembled, and the height of the pulling component and the top support component can be flexibly adjusted according to the blade maintenance position, improving the versatility of the device.

[0019] Preferably, the positioning plate 1 is provided with a lifting handle 6, which is vertically set on the surface of the positioning plate 1. When installing and positioning the positioning plate 1, the operator controls the positioning plate 1 by lifting the handle 6. The lifting handle 6 facilitates the handling, installation and positioning of the device, and can also be used as a hoisting point, making it suitable for high-altitude operation scenarios.

[0020] Preferably, the pulling assembly includes a movable shaft 9, a movable rod 10, a first movable plate 11, and a first rotating shaft 12. The movable shaft 9 is rotatably mounted on the L-shaped mounting bracket 8. The movable rod 10 passes through the movable shaft 9, and its bottom is fixedly connected to the first rotating shaft 12. The first movable plate 11 is also fixedly connected to the first rotating shaft 12. The movable shaft 9 can drive the movable rod 10 to rotate and adjust the pulling angle. The first movable plate 11 forms a lever arm, which can rotate around the first rotating shaft 12 when subjected to the pulling force of the top support adjustment assembly, thereby realizing the pulling operation of the blade.

[0021] Preferably, the top support assembly includes a top support rod 13, a second movable plate 15, and a second rotating shaft 16. The second rotating shaft 16 is coaxially rotatably connected to the first rotating shaft 12, and the second movable plate 15 is fixedly connected to the second rotating shaft. The top support rod 13 passes through the second rotating shaft 16 and can rotate synchronously with the second rotating shaft 16. The second rotating shaft 16 and the first rotating shaft 12 rotate independently on the same axis, ensuring that the pulling and top support actions do not interfere with each other. The top support rod 13 can rotate with the second rotating shaft 16 to adjust the top support angle, adapting to the different blade top support opening angle requirements.

[0022] Preferably, the top support rod 13 is provided with a top support foot 14 at one end near the turbine blade. The top support foot 14 is made of wear-resistant material, conforms to the blade structure to increase the contact area, avoids blade damage, and allows for quick replacement to fit blades of different specifications.

[0023] Preferably, the top support adjustment assembly includes an adjusting screw 17, a movable collar 18, a spring 19, and a rotating adjusting block 20. The bottom of the adjusting screw 17 is hinged to the end of the second movable plate 15 away from the second rotating shaft 16. The movable collar 18 is fixedly disposed at the end of the first movable plate 11 away from the first rotating shaft 12. The adjusting screw 17 passes through the movable collar 18. The rotating adjusting block 20 is threadedly connected to the adjusting screw 17. The spring 19 is sleeved on the outside of the adjusting screw 17 between the movable collar 18 and the rotating adjusting block 20. The movable collar 18 and the rotating adjusting block 20 limit the movement of the spring 19. The rotation adjustment block 20 can adjust the compression of the spring 19. Rotating the spring 19 downwards compresses the spring 19, causing the first movable plate 11 to rotate and pull the blade. The spring 19 buffers and avoids rigid impact. When the rotation adjustment block 20 is rotated to a certain position, the pulling component cannot move. At this time, continue to rotate the rotation adjustment block 20 downwards to lift the second movable plate 15 upwards. The second movable plate 15 drives the top support rod 13 to support the blade, opening up the blade that is attached to the top support foot 14, increasing the blade spacing, and facilitating the processing and maintenance of the blade.

[0024] Without removing the blades to be inspected, the operator holds the lifting handle 6 on the positioning plate 1 and moves the entire device to the position of the turbine blade to be inspected, so that the inner side of the positioning plate 1 fits against the turbine blade root structure; according to the blade height, the two sets of L-shaped mounting brackets 8 are installed in the mounting grooves 7 at appropriate heights on the positioning plate 1; the bolts 2 of the clamping and fixing components are adjusted so that they slide along the strip grooves 5 on the positioning plate 1 to the appropriate clamping position, and the fixing clips 3 are placed against the part of the turbine blade to be clamped; the adjusting turntable 4 is rotated to push the fixing clips 3 towards the positioning plate 1, and the device is fixed to the turbine through the bidirectional clamping of the positioning plate 1 and the fixing clips 3; Rotating the adjusting block 20 downwards causes the first movable plate 11 to rotate counterclockwise around the first rotating shaft 12 via the elastic force of the spring 19. This, in turn, causes the movable rod 10 to rotate counterclockwise in sync. The movable rod 10 is limited by the positioning plate 1. At this point, continuing to rotate the adjusting block 20 downwards causes the adjusting screw 17 to move upwards when the movable collar 18 cannot move. This simultaneously lifts the second movable plate 15 clockwise, causing the top support rod 13 and the top support leg 14 to move clockwise, thus supporting the contacting blades and increasing the distance between the blades. This makes it easier for operators to process and maintain the blades.

[0025] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A device for overhauling steam turbine blades, characterized in that: The device includes a positioning plate (1), a clamping and fixing assembly, an L-shaped mounting bracket (8), a pulling assembly, a top support assembly, and a top support adjustment assembly. The positioning plate (1) is a flat plate with a strip groove (5) on it. The strip groove (5) is vertically arranged on the positioning plate (1). The clamping and fixing assembly is installed on the positioning plate (1) through the strip groove (5). The device is fixed on the turbine blade by the cooperation of the positioning plate (1) and the clamping and fixing assembly. Two sets of L-shaped mounting brackets (8) are symmetrically arranged on the positioning plate (1). The pulling assembly is connected to the L-shaped mounting bracket (8). The top support assembly is hinged to the pulling assembly. One end of the top support assembly abuts against the turbine blade, and the other end is connected to the end of the pulling assembly away from the positioning plate (1) through the top support adjustment assembly.

2. The device for overhauling steam turbine blades according to claim 1, characterized in that: The clamping and fixing assembly includes a bolt (2), a fixing clip (3), and an adjusting turntable (4). The bolt (2) is set through the strip groove (5). The fixing clip (3) is movably set on the bolt (2). The adjusting turntable (4) is threadedly connected to the bolt (2). The adjusting turntable (4) limits the fixing clip (3). The device is fixed on the steam turbine by the positioning plate (1) and the fixing clip (3).

3. The device for overhauling steam turbine blades according to claim 1, characterized in that: The positioning plate (1) has multiple sets of mounting slots (7) symmetrically opened at different heights. The L-shaped mounting bracket (8) is set on the positioning plate (1) through the mounting slots (7). According to the maintenance position, the L-shaped mounting bracket (8) is set in the mounting slots (7) at different heights.

4. The device for overhauling steam turbine blades according to claim 1, characterized in that: The positioning plate (1) is provided with a lifting handle (6), which is vertically arranged on the surface of the positioning plate (1). When the positioning plate (1) is installed and positioned, the operator controls the positioning plate (1) by lifting the handle (6).

5. The device for overhauling steam turbine blades according to claim 1, characterized in that: The pulling assembly includes a movable shaft (9), a movable rod (10), a first movable plate (11), and a first rotating shaft (12). The movable shaft (9) is rotatably mounted on the L-shaped mounting bracket (8). The movable rod (10) passes through the movable shaft (9). The bottom of the movable rod (10) is fixedly connected to the first rotating shaft (12). The first movable plate (11) is fixedly connected to the first rotating shaft (12).

6. The device for overhauling steam turbine blades according to claim 5, characterized in that: The top support assembly includes a top support rod (13), a second movable plate (15), and a second rotating shaft (16). The second rotating shaft (16) is coaxially rotatably connected to the first rotating shaft (12). The second movable plate (15) is fixedly connected to the second rotating shaft. The top support rod (13) passes through the second rotating shaft (16) and can rotate synchronously with the second rotating shaft (16).

7. The device for overhauling steam turbine blades according to claim 6, characterized in that: The top support rod (13) is provided with a top support foot (14) at one end near the turbine blade.

8. The device for overhauling steam turbine blades according to claim 6, characterized in that: The top support adjustment assembly includes an adjustment screw (17), a movable collar (18), a spring (19), and a rotating adjustment block (20). The bottom of the adjustment screw (17) is hinged to the end of the second movable plate (15) away from the second rotating shaft (16). The movable collar (18) is fixedly disposed at the end of the first movable plate (11) away from the first rotating shaft (12). The adjustment screw (17) passes through the movable collar (18). The rotating adjustment block (20) is threadedly connected to the adjustment screw (17). The spring (19) is sleeved on the outside of the adjustment screw (17) between the movable collar (18) and the rotating adjustment block (20). The movable collar (18) and the rotating adjustment block (20) limit the movement of the spring (19).

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