Cylinder lifting device for steam turbine overhaul

Abstract

The invention relates to the technical field of steam turbine overhaul, in particular to a steam turbine overhaul cylinder lifting device which comprises a supporting stand column, a hydraulic jacking assembly, a supporting cross beam and a hanging assembly. The supporting stand columns are arranged on the two sides of a steam turbine cylinder, the hydraulic jacking assemblies are arranged at the upper ends of the supporting stand columns, the supporting cross beam is erected on the tops of the hydraulic jacking assemblies on the two sides and stretches across the steam turbine cylinder, and the hanging assembly is arranged on the supporting cross beam and connected with a steam turbine cylinder lifting lug. The hydraulic jacking assembly drives the supporting cross beam to ascend, so that the steam turbine cylinder is lifted and is separated from the front bearing box, and the front bearing box is disassembled and overhauled under the condition that the steam turbine cylinder is not disassembled; the disturbance to the cylinder body in the traditional disassembling process is avoided, the maintenance efficiency is improved, and the safety risk is reduced.

Description

Technical Field

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

[0002] According to maintenance standards and specifications, steam turbines in power plants require regular inspections and troubleshooting. During maintenance, it is often necessary to measure and adjust the levelness of the cylinder bearing housing, especially the front bearing housing, which bears the responsibility of supporting and supporting the cylinder's expansion and sliding. If there are problems with the sliding pins, shims, or foundation at the bottom of the front bearing housing, and the bearing housing needs to be removed, the steam turbine cylinder must be dismantled before the front bearing housing can be lifted out.

[0003] The turbine's lower cylinder is welded to numerous extraction steam pipes and drainage pipes. Dismantling it would be extremely labor-intensive, increasing the typical maintenance period from 30 days to over 60 days, resulting in significant waste of manpower and resources and impacting power generation. Therefore, it is necessary to invent a temporary cylinder lifting device for turbine maintenance, enabling the front bearing housing to be lifted out for maintenance without dismantling the turbine cylinder body. Summary of the Invention

[0004] The technical objective of this invention is to provide a cylinder lifting device for turbine maintenance, enabling safe disassembly and maintenance of the front bearing housing without removing the cylinder.

[0005] To achieve the above-mentioned technical objectives, the present invention provides the following technical solution: This invention provides a cylinder lifting device for turbine maintenance, comprising a support column, a hydraulic lifting assembly, a support beam, and a hanging assembly for connecting to the turbine cylinder lifting lugs; the support column is disposed on both sides of the turbine cylinder; the hydraulic lifting assembly is disposed on the upper end of the support column; the support beam is mounted on the top of the hydraulic lifting assemblies on both sides and spans across the turbine cylinder; the hanging assembly is disposed on the support beam and connected to the turbine cylinder lifting lugs.

[0006] This invention uses a hydraulic lifting assembly to drive the support beam upward, which lifts the turbine cylinder and separates it from the front bearing housing, thus allowing the front bearing housing to be disassembled and repaired without removing the turbine cylinder.

[0007] Preferably, the supporting beam is a composite beam structure formed by connecting at least two H-beams.

[0008] Furthermore, during welding, the webs of the two H-beams are parallel and the flanges are aligned before welding; during installation, the flanges of the supporting beam are installed on the supporting column and the webs are set vertically.

[0009] Preferably, the suspension assembly includes an adjustable lifting ring and a connecting support. One end of the adjustable lifting ring is connected to the turbine cylinder lifting lug, and the other end is installed on the support beam through the connecting support.

[0010] More preferably, the adjustable lifting ring is U-shaped with threads at both ends, and is slidably connected to the connecting support through nuts, for adjusting the hanging length.

[0011] Furthermore, the connecting support is π-shaped, and the connecting support is snapped onto the supporting beam through the π-shaped structure, and the two ends of the U-shaped adjustable lifting ring are respectively connected through the two root parts at the bottom of the π-shape.

[0012] Preferably, the supporting column includes a supporting steel pipe in the middle and supporting plates at the upper and lower ends of the supporting steel pipe. The upper supporting plate is used to support the hydraulic lifting assembly, and the lower supporting plate is used to contact and support the ground. The supporting steel pipe and the supporting plate are welded and fixed to each other to form an integral load-bearing structure.

[0013] Preferably, the hydraulic lifting assembly is a hydraulic jack, the bottom of which is fixedly connected to the support column, and the jack rod on it is connected to the support beam.

[0014] The beneficial effects of this invention are as follows: 1. This invention involves installing support columns on both sides of the turbine cylinder and arranging hydraulic jacking components on them to drive the overall lifting and lowering of the support beam. A suspension assembly is installed on the support beam and connected to the turbine cylinder lifting lugs. During the lifting process, the turbine cylinder is lifted as a whole and detached from the front bearing housing, thus forming a stable force transmission path. The cylinder load is transmitted to the support beam via the suspension assembly, and then to the ground via the hydraulic jacking assembly and support columns. This allows for the safe disassembly and maintenance of the front bearing housing without removing the turbine cylinder, avoiding disturbance to the cylinder body during traditional disassembly, improving maintenance efficiency, and reducing safety risks.

[0015] 2. Furthermore, by setting the supporting crossbeam as a composite beam structure formed by connecting at least two H-beams, and ensuring that the webs of the two H-beams are parallel and the flanges are aligned during welding, the two H-beams can work together under load, thereby improving the overall structural stability in the lateral direction. At the same time, the effective support width of the crossbeam is increased, allowing the hanging components to be flexibly arranged according to the position of the cylinder lifting lugs, thereby improving load distribution, reducing local stress concentration, and improving the smoothness and reliability of the lifting process.

[0016] 3. Furthermore, by setting up a suspension assembly including an adjustable lifting ring and a connecting support, wherein the adjustable lifting ring adopts a threaded U-shaped structure and is connected to the connecting support through a nut, the suspension length can be adjusted according to the spatial position of the turbine cylinder lifting lug. At the same time, the connecting support adopts a π-shaped structure and is snapped onto the support beam, so that the suspension assembly can be positioned on the beam and achieve a stable connection. This allows for rapid adaptation to turbines of different models or installation states, improving the versatility and ease of operation of the device. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] The above and other aspects of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the overall lifting device according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the installation relationship between the supporting beam and the connecting support member according to an embodiment of the present invention.

[0019] In the diagram: 1. Support column; 11. Support steel pipe; 12. Support plate; 2. Hydraulic jacking assembly; 3. Support beam; 4. Hanging assembly; 41. Adjustable lifting ring; 42. Connecting support component; 5. Steam turbine cylinder. Detailed Implementation

[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0021] In Example 1, as Figure 1As shown, this embodiment provides a cylinder lifting device for turbine maintenance, including a support column 1, a hydraulic jacking assembly 2, a support beam 3, and a hanging assembly 4 for connecting to the lifting lugs of the turbine cylinder 5. The support column 1 is arranged on both sides of the turbine cylinder 5, so that the turbine cylinder 5 is located in the space between the two columns and forms a symmetrical support structure. The hydraulic jacking assembly 2 is arranged on the upper end of the support column 1 to provide vertical jacking force and serve as an intermediate force transmission component. The support beam 3 is supported on both sides of the hydraulic jacking assembly. 2. The top of the structure spans across the turbine cylinder 5, allowing it to bear the concentrated load from the suspension assembly 4 in a spanning arrangement. The suspension assembly 4 is mounted on the support beam 3 and connected to the lifting lugs of the turbine cylinder 5, forming a force path from the turbine cylinder 5 through the suspension assembly 4 to the support beam 3. The support beam 3 is driven to rise by the hydraulic lifting assembly 2, so that the turbine cylinder 5 is lifted by the suspension assembly 4 and detached from the front bearing housing, thereby completing the disassembly and maintenance of the front bearing housing without removing the turbine cylinder 5.

[0022] In this embodiment, during the process, the weight of the turbine cylinder 5 is sequentially transferred to the ground via the hanging assembly 4, the support beam 3, the hydraulic lifting assembly 2, and the support column 1, forming a continuous and stable load-bearing system. This makes the lifting process smooth and controllable, avoiding additional disturbances to the turbine body.

[0023] In another embodiment, namely embodiment two, based on embodiment one, such as... Figure 1 and Figure 2 As shown, the supporting beam 3 is a composite beam structure formed by connecting at least two H-beams. Specifically, two 300*150mm H-beams are selected and welded together to form an integral structure. During welding, the webs of the two H-beams are parallel and the flanges are aligned, so that the two H-beams are arranged side by side in the transverse direction and connected by welding to form an integral load-bearing component. During installation, the flanges of the supporting beam 3 are installed on the supporting column 1 and the web is set vertically, so that the load is supported by the flanges and the supporting column 1 in surface contact, thereby improving the stability of the support and reducing local compressive stress.

[0024] In this embodiment, the suspension assembly 4 includes an adjustable lifting ring 41 and a connecting support 42. One end of the adjustable lifting ring 41 is connected to the lifting lug of the turbine cylinder 5, and the other end is installed on the supporting beam 3 through the connecting support 42. The adjustable lifting ring 41 is U-shaped with threads at both ends and is slidably connected to the connecting support 42 through nuts for adjusting the suspension length. The adjustable lifting ring 41 is made of 20mm diameter round steel bent into shape, which can achieve length adjustment while ensuring strength. The connecting support 42 is π-shaped and is snapped onto the supporting beam 3 through the π-shaped structure. The two roots at the bottom of the π-shape are respectively connected to the two ends of the U-shaped adjustable lifting ring 41. The connecting support 42 is formed by welding a 12mm thick steel plate, which makes the connection of the suspension assembly 4 on the supporting beam 3 more stable and allows for position adjustment along the beam direction.

[0025] In this embodiment, as Figure 1 As shown, the support column 1 includes a support steel pipe 11 in the middle and support plates 12 at the upper and lower ends of the support steel pipe 11. The upper support plate 12 is used to support the hydraulic lifting assembly 2, and the lower support plate 12 is used to support the ground. The support steel pipe 11 is a steel pipe with a diameter of 325mm and a thickness of 12mm. The upper and lower support plates 12 are steel plates with a thickness of 10mm and a diameter of 600*600mm. The support steel pipe 11 and the support plate 12 are welded and fixed to each other to form an integral load-bearing structure, thereby improving the overall rigidity and load-bearing capacity of the support column 1.

[0026] In this embodiment, the hydraulic jacking component 2 is a hydraulic jack. A modified 10t hydraulic jack is selected. Specifically, its bottom is fixedly connected to the support column 1, and its jacking rod is connected to the support beam 3, so that the jacking force can be stably transmitted to the support beam 3, realizing the smooth lifting of the turbine cylinder 5, and ensuring that the overall structure is subjected to uniform force during the jacking process.

[0027] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

[0028] Although one or more exemplary embodiments of this disclosure have been described with reference to the accompanying drawings, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims.

[0029] The foregoing description is merely illustrative of this disclosure, and modifications may be made to the invention in light of the above detailed description. The terminology used in the appended claims should not be construed as limiting the invention to the specific embodiments disclosed in the specification. Rather, the scope of the invention will be fully defined by the appended claims, which will be interpreted according to established principles of claim interpretation.

Claims

1. A cylinder lifting device for turbine maintenance, characterized in that, Includes a support column (1), a hydraulic lifting assembly (2), a support beam (3), and a suspension assembly (4) for connecting to the lifting lugs of the turbine cylinder (5); The supporting columns (1) are located on both sides of the turbine cylinder (5); The hydraulic lifting assembly (2) is installed at the upper end of the support column (1); The supporting beam (3) is mounted on the top of the hydraulic lifting components (2) on both sides and spans the turbine cylinder (5); The suspension assembly (4) is mounted on the support beam (3) and connected to the lifting lug of the turbine cylinder (5); The support beam (3) is driven to rise by the hydraulic lifting assembly (2), so that the turbine cylinder (5) is lifted by the hoisting assembly (4) and separated from the front bearing housing, thereby completing the disassembly and maintenance of the front bearing housing without removing the turbine cylinder (5).

2. The cylinder lifting device for turbine maintenance according to claim 1, characterized in that: The supporting beam (3) is a composite beam structure formed by connecting at least two H-beams.

3. A cylinder lifting device for turbine maintenance according to claim 2, characterized in that: During welding, the webs of the two H-beams are parallel and the flanges are aligned for welding; during installation, the flanges of the supporting beam (3) are installed on the supporting column (1) and the webs are set vertically.

4. A cylinder lifting device for turbine maintenance according to claim 1, characterized in that: The suspension assembly (4) includes an adjustable lifting ring (41) and a connecting support (42). One end of the adjustable lifting ring (41) is connected to the lifting lug of the turbine cylinder (5), and the other end is installed on the support beam (3) through the connecting support (42).

5. A cylinder lifting device for turbine maintenance according to claim 4, characterized in that: The adjustable lifting ring (41) is U-shaped with threads at both ends. It is slidably connected to the connecting support (42) via nuts and is used to adjust the hanging length.

6. A cylinder lifting device for turbine maintenance according to claim 5, characterized in that: The connecting support (42) is π-shaped. The connecting support (42) is snapped onto the supporting beam (3) through the π-shaped structure, and the two ends of the U-shaped adjustable lifting ring (41) are respectively connected through the two root parts at the bottom of the π-shape.

7. A cylinder lifting device for turbine maintenance according to claim 1, characterized in that: The supporting column (1) includes a supporting steel pipe (11) in the middle and supporting plates (12) at the upper and lower ends of the supporting steel pipe (11). The upper supporting plate (12) is used to support the hydraulic lifting assembly (2), and the lower supporting plate (12) is used to contact the ground for support. The supporting steel pipe (11) and the supporting plate (12) are welded and fixed to each other to form an integral load-bearing structure.

8. A cylinder lifting device for turbine maintenance according to claim 1, characterized in that: The hydraulic lifting assembly (2) is a hydraulic jack, the bottom of which is fixedly connected to the support column (1), and the top rod on it is connected to the support beam (3).

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