Jacking device for disassembling and assembling large check valve and disassembling and assembling method

Abstract

The invention relates to the technical field of valve disassembly and assembly, and aims at providing a jacking device for disassembly and assembly of a large check valve, the jacking device comprises a plurality of jacking assemblies and an oil inlet system, and first connecting plates and second connecting plates in the jacking assemblies are installed on pipelines on the two sides of the check valve correspondingly; a plurality of hydraulic cylinder assemblies are installed between the first connecting plate and the second connecting plate and used for pushing the first connecting plate to be away from the second connecting plate and forcing pipelines on the two sides of the check valve to be separated, one ends of a plurality of oil feeding pipes in the oil inlet system communicate with the corresponding hydraulic cylinder assemblies, and a flow distributing and collecting valve is arranged between the other ends of the oil feeding pipes and the main oil inlet pipeline; a plurality of hydraulic cylinder assemblies are installed between the pipelines on the two sides of the check valve and used for separating the pipelines on the two sides of the check valve, so that maintenance workers can conveniently detach the check valve from the pipelines for maintenance or replacement. And through automatic adjustment of the flow distributing and collecting valve, the hydraulic cylinder assemblies are jacked synchronously, and the situation that the jacking device is stuck due to asynchronization is avoided.

Description

Technical Field

[0001] This invention relates to the field of valve disassembly and assembly technology, and more specifically, to a jacking device and disassembly and assembly method for large check valves. Background Technology

[0002] In large industrial pipeline systems (such as main steam pipelines, water pipelines, and oil and gas pipelines in thermal power generation, petrochemical, and water conservancy projects), check valves, as key fluid control components, are usually rigidly connected between two pipeline sections via flanges. Their core function is to achieve unidirectional flow control by relying on the pressure difference of the medium, preventing backflow of the medium from causing equipment damage, system pressure fluctuations, and other safety hazards.

[0003] However, for large check valves with a nominal diameter exceeding 1 meter and a weight of several tons, their disassembly and assembly operations have long faced significant technical bottlenecks: Structural limitations make separation difficult: Because the check valve is fastened to the pipelines on both sides by multiple sets of high-strength bolts, after long-term operation, the flange surface is prone to adhesion due to factors such as media erosion, temperature stress, and corrosion, and the bolts may also seize up. It is difficult to overcome the static friction of the connection surface to achieve separation by relying solely on manpower or conventional lifting equipment.

[0004] Traditional tools have poor applicability: Existing jacks and other lifting tools are mostly designed for single-point force application. When used on large pipelines, they can easily cause local deformation of the pipeline. Furthermore, it is difficult to control the synchronization of multiple sets of tools, which may lead to pipe flange misalignment, damage to the sealing surface, or even jamming or damage to the lifting device due to uneven force application.

[0005] Low operational efficiency and safety: Traditional disassembly and assembly methods require the removal of a large number of bolts and forced prying, which is not only time-consuming and labor-intensive (a single operation often takes several days), but also poses safety risks such as sudden displacement of pipelines and tool slippage. It requires extremely high skills from operators and is prone to causing secondary damage to the check valve body and pipelines.

[0006] Therefore, in response to the pain points of "difficult separation, easy damage, and low efficiency" in the disassembly and assembly of large check valves, there is an urgent need for a special lifting device that can achieve smooth separation of pipelines through structural design, providing safe and efficient technical support for the maintenance and replacement of check valves. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention provides a lifting device and a disassembly and assembly method for large check valves, so as to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a lifting device for disassembling and assembling large check valves, comprising: Several lifting components, including a first connecting plate, a second connecting plate, and several hydraulic cylinder assemblies, are provided. The first and second connecting plates are respectively installed on the pipes on both sides of the check valve. The hydraulic cylinder assemblies are installed between the first and second connecting plates to push the first connecting plate away from the second connecting plate, thereby forcing the pipes on both sides of the check valve to separate. The oil inlet system includes a main oil inlet pipe and several oil delivery pipes. One end of each oil delivery pipe is connected to a corresponding hydraulic cylinder assembly, and the other end is connected to the main oil inlet pipe by a flow divider and combiner valve, which is used to deliver the oil in the main oil inlet pipe to each hydraulic cylinder assembly, so that the several hydraulic cylinder assemblies are lifted synchronously.

[0009] By adopting the above technical solution, several hydraulic cylinder assemblies are installed between the pipes on both sides of the check valve to separate the pipes on both sides of the check valve, so that maintenance workers can easily remove the check valve from the pipes for maintenance or replacement; through the automatic adjustment of the diversion and combination valve, the several hydraulic cylinder assemblies are lifted synchronously to avoid the lifting device from jamming due to asynchrony.

[0010] The invention is further configured such that the hydraulic cylinder assembly has a hollow structure with a through hole, and a guide rod is provided in the through hole. The top end of the guide rod is connected to the first connecting plate, and the bottom end is slidably connected to the second connecting plate along its moving direction, for guiding the hydraulic cylinder assembly.

[0011] The invention is further configured such that a guide sleeve is installed on the second connecting plate, the bottom end of the guide rod slides inside the guide sleeve, and the hydraulic cylinder assembly is installed on the guide sleeve.

[0012] The present invention is further configured such that the hydraulic cylinder assembly includes: The cylinder block has a through hole for the guide rod to pass through, and an oil chamber with one end open is formed on the cylinder block, which divides the cylinder block into an inner cylinder block and an outer cylinder block. The piston and piston rod are integrally formed. The piston rod has a through hole for the guide rod to pass through. The piston is annular and is slidably disposed in the oil chamber. The inner and outer ring walls of the piston are slidably engaged with the inner and outer cylinder bodies, respectively. The piston rod can extend out of the oil chamber from the open end of the oil chamber.

[0013] The invention is further configured such that a limiting member is connected to the internal thread of the oil cavity, and a guide hole is provided on the limiting member for the piston rod to pass through.

[0014] The invention is further configured such that a spring is installed inside the oil chamber, the spring is sleeved outside the piston rod, and the two ends of the spring abut against the limiting member and the piston, respectively.

[0015] The invention is further configured such that an oil inlet pipe communicating with the oil chamber is also installed on the cylinder block.

[0016] The invention is further configured such that both the first connecting plate and the second connecting plate are bolted to a flange pre-installed on the pipe.

[0017] The present invention is further configured such that the oil delivery pipe includes a main oil delivery pipe and several branch oil delivery pipes. The main oil delivery pipe is connected to the main oil inlet pipe through a diversion and combination valve. One end of each of the several branch oil delivery pipes is connected to a corresponding hydraulic cylinder assembly, and the other end is connected to the main oil delivery pipe through a diversion and combination valve.

[0018] Based on the aforementioned lifting device for disassembling and assembling large check valves, a method for disassembling and assembling large check valves is also provided, including: S1: Install the lifting device: Install the first connecting plate and the second connecting plate on the pipe flanges on both sides of the check valve, and the hydraulic cylinder assembly is located between the first connecting plate and the second connecting plate; S2: Connect the oil circuit system: Connect the main oil inlet pipe to the oil tank and oil pump, connect several main oil delivery pipes to the main oil inlet pipe through the diversion and combination valve, and connect one end of several branch oil delivery pipes to the corresponding main oil delivery pipes and the other end to the corresponding hydraulic cylinder assembly. S3: Separation Pipeline: Oil is supplied to the hydraulic cylinder assembly through the main inlet pipeline, main delivery pipeline and branch delivery pipeline. The hydraulic cylinder assembly is pushed upward, forcing the two pipelines to separate and exposing the check valve. S4: Repair or disassemble the check valve.

[0019] Compared with the prior art, the present invention provides a lifting device and a method for disassembling and assembling large check valves, which has the following advantages: 1. Install several hydraulic cylinder assemblies between the pipes on both sides of the check valve to separate the pipes on both sides of the check valve, so that maintenance workers can easily remove the check valve from the pipes for maintenance or replacement.

[0020] 2. The flow divider valve automatically adjusts the hydraulic cylinder components to lift them synchronously, preventing the lifting device from jamming due to asynchrony.

[0021] 3. The hydraulic cylinder assembly is designed with a hollow internal structure and has a guide rod inside for guidance. When the hydraulic cylinder assembly is lifted upward, it can be limited by the guide rod to prevent lateral displacement and jamming. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of a lifting device for disassembling and assembling large check valves; Figure 2 A schematic diagram of the overall structure of a lifting device for disassembling and assembling large check valves; Figure 3 This is a cross-sectional schematic diagram of the hydraulic cylinder assembly; Figure 4This is a schematic diagram of the exploded structure of the lifting assembly.

[0023] In the diagram: 1. Lifting assembly; 2. Oil inlet system; 3. First connecting plate; 4. Second connecting plate; 5. Hydraulic cylinder assembly; 501. Cylinder body; 501A. Inner cylinder body; 501B. Outer cylinder body; 502. Piston; 503. Piston rod; 504. Oil chamber; 505. Limiting component; 506. Spring; 507. Oil inlet pipe; 6. Main oil inlet pipe; 7. Oil delivery pipe; 701. Main oil delivery pipe; 702. Branch oil delivery pipe; 8. Diverter valve; 9. Guide rod; 10. Guide sleeve. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0027] A lifting device for disassembling and assembling a large check valve includes several sets of lifting components 1 and an oil inlet system 2. The lifting components 1 include a first connecting plate 3, a second connecting plate 4, and several hydraulic cylinder assemblies 5. The first connecting plate 3 and the second connecting plate 4 are respectively installed on the pipes on both sides of the check valve. The hydraulic cylinder assemblies 5 are installed between the first connecting plate 3 and the second connecting plate 4 to push the first connecting plate 3 away from the second connecting plate 4, forcing the pipes on both sides of the check valve to separate. The oil inlet system 2 includes a main oil inlet pipe 6 and several oil delivery pipes 7, one end of which is connected to a corresponding hydraulic cylinder assembly 5. The main oil inlet pipe 6 is connected to the main oil inlet pipe 6 at one end and a flow divider / combiner valve 8 at the other end. The flow divider / combiner valve 8 is used to transport the oil in the main oil inlet pipe 6 to each hydraulic cylinder assembly 5, so that several hydraulic cylinder assemblies 5 are lifted synchronously. The first connecting plate 3 and the second connecting plate 4 are both connected to the flanges pre-installed on the pipeline by bolts. The oil delivery pipe 7 includes a main oil delivery pipe 701 and several branch oil delivery pipes 702. The main oil delivery pipe 701 is connected to the main oil inlet pipe 6 through the flow divider / combiner valve 8. One end of the several branch oil delivery pipes 702 is connected to the corresponding hydraulic cylinder assembly 5, and the other end is connected to the main oil delivery pipe 701 through the flow divider / combiner valve 8.

[0028] In practical applications, the oil inlet system 2 enables several hydraulic cylinder assemblies 5 to be simultaneously inlet oil and lifted, forcing the first connecting plate 3 away from the second connecting plate 4, thereby making the pipes on both sides of the check valve move away from each other, making it convenient for maintenance personnel to repair or replace the check valve.

[0029] In this embodiment, the hydraulic cylinder assembly 5 is a hollow structure with a through hole, and a guide rod 9 is provided in the through hole. The top end of the guide rod 9 is connected to the first connecting plate 3, and the bottom end is slidably connected to the second connecting plate 4 along its moving direction to guide the hydraulic cylinder assembly 5. A guide sleeve 10 is installed on the second connecting plate 4, and the bottom end of the guide rod 9 is slidably located in the guide sleeve 10. The hydraulic cylinder assembly 5 is installed on the guide sleeve 10.

[0030] The hydraulic cylinder assembly 5 includes a cylinder body 501 and an integrally formed piston 502 and piston rod 503. The cylinder body 501 has a through hole for the guide rod 9 to pass through, and an oil chamber 504 with one open end is formed on the cylinder body 501, dividing the cylinder body 501 into an inner cylinder body 501A and an outer cylinder body 501B. The piston rod 503 has a through hole for the guide rod 9 to pass through. The piston 502 is annular and slidably disposed within the oil chamber 504. The inner and outer annular walls of the piston 502 are respectively connected to the inner cylinder body 501A. 01A and the outer cylinder 501B are in sliding fit. The piston rod 503 can extend from the open end of the oil chamber 504 to the outside of the oil chamber 504. The oil chamber 504 is threadedly connected to a limiting member 505. The limiting member 505 has a guide hole for the piston rod 503 to pass through. A spring 506 is also installed in the oil chamber 504. The spring 506 is sleeved on the outside of the piston rod 503, and the two ends of the spring 506 abut against the limiting member 505 and the piston 502 respectively. The cylinder 501 is also equipped with an oil inlet pipe 507 that communicates with the oil chamber 504.

[0031] In a specific application, the oil inlet pipe 507 injects oil into the oil chamber 504, pushing the piston 502 to move within the oil chamber 504, thereby pushing the piston rod 503 to extend outward and pushing the first connecting plate 3 away from the second connecting plate 4. During this process, the guide rod 9 is set in the through hole inside the cylinder body 501 and the piston rod 503 to guide the hydraulic cylinder assembly 5.

[0032] Based on the aforementioned lifting device for disassembling and assembling large check valves, a method for disassembling and assembling large check valves using the lifting device is also provided, comprising: S1: Install the lifting device: Install the first connecting plate and the second connecting plate on the pipe flanges on both sides of the check valve, and the hydraulic cylinder assembly is located between the first connecting plate and the second connecting plate, and remove the bolts on the flange between the check valve and the pipe; S2: Connect the oil circuit system: Connect the main oil inlet pipe to the oil tank and oil pump, connect several main oil delivery pipes to the main oil inlet pipe through the diversion and combination valve, and connect one end of several branch oil delivery pipes to the corresponding main oil delivery pipes and the other end to the corresponding hydraulic cylinder assembly. S3: Separation Pipeline: Oil is supplied to the hydraulic cylinder assembly through the main inlet pipeline, main delivery pipeline and branch delivery pipeline. The hydraulic cylinder assembly is pushed upward, forcing the two pipelines to separate and exposing the check valve. S4: Repair or disassemble the check valve.

[0033] In all the solutions mentioned above, although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A jacking device for disassembling and assembling large check valves, characterized in that it includes: Several lifting components, including a first connecting plate, a second connecting plate, and several hydraulic cylinder assemblies, are provided. The first and second connecting plates are respectively installed on the pipes on both sides of the check valve. The hydraulic cylinder assemblies are installed between the first and second connecting plates to push the first connecting plate away from the second connecting plate, thereby forcing the pipes on both sides of the check valve to separate. The oil inlet system includes a main oil inlet pipe and several oil delivery pipes. One end of each oil delivery pipe is connected to a corresponding hydraulic cylinder assembly, and the other end is connected to the main oil inlet pipe by a flow divider and combiner valve, which is used to deliver the oil in the main oil inlet pipe to each hydraulic cylinder assembly, so that the several hydraulic cylinder assemblies are lifted synchronously.

2. The jacking device for dismounting a large check valve according to claim 1, wherein The hydraulic cylinder assembly has a hollow structure with a through hole and a guide rod inside the through hole. The top end of the guide rod is connected to the first connecting plate, and the bottom end is slidably connected to the second connecting plate along its moving direction, for guiding the hydraulic cylinder assembly.

3. The jacking device for dismounting a large check valve according to claim 2, wherein The hydraulic cylinder assembly includes: The cylinder block has a through hole for the guide rod to pass through, and an oil chamber with one end open is formed on the cylinder block, which divides the cylinder block into an inner cylinder block and an outer cylinder block. An oil inlet pipe communicating with the oil chamber is also installed on the cylinder block. The piston and piston rod are integrally formed. The piston rod has a through hole for the guide rod to pass through. The piston is annular and is slidably disposed in the oil chamber. The inner and outer ring walls of the piston are slidably engaged with the inner and outer cylinder bodies, respectively. The piston rod can extend out of the oil chamber from the open end of the oil chamber.

4. The jacking device for dismounting a large check valve according to claim 3, wherein The oil cavity is internally threaded with a limiting component, and the limiting component has a guide hole for the piston rod to pass through.

5. The jacking device for dismounting a large check valve according to claim 4, wherein A spring is also installed inside the oil chamber. The spring is sleeved outside the piston rod, and the two ends of the spring abut against the limiting member and the piston, respectively.

6. The jacking device for dismounting a large check valve according to claim 1, wherein The oil delivery pipe includes a main oil delivery pipe and several branch oil delivery pipes. The main oil delivery pipe is connected to the main oil inlet pipe through a diversion and combination valve. One end of each branch oil delivery pipe is connected to a corresponding hydraulic cylinder assembly, and the other end is connected to the main oil delivery pipe through a diversion and combination valve.

7. The jacking device for disassembling and assembling a large check valve according to claim 2, characterized in that, A guide sleeve is installed on the second connecting plate, the bottom end of the guide rod slides inside the guide sleeve, and the hydraulic cylinder assembly is installed on the guide sleeve.

8. A method for disassembling and assembling a large check valve using a jacking device according to any one of claims 1-6, characterized in that, include: S1: Install the lifting device: Install the first connecting plate and the second connecting plate on the pipe flanges on both sides of the check valve, and the hydraulic cylinder assembly is located between the first connecting plate and the second connecting plate; S2: Connect the oil circuit system: Connect the main oil inlet pipe to the oil tank and oil pump, connect several main oil delivery pipes to the main oil inlet pipe through the diversion and combination valve, and connect one end of several branch oil delivery pipes to the corresponding main oil delivery pipes and the other end to the corresponding hydraulic cylinder assembly. S3: Separation Pipeline: Oil is supplied to the hydraulic cylinder assembly through the main inlet pipeline, main delivery pipeline and branch delivery pipeline. The hydraulic cylinder assembly is pushed upward, forcing the two pipelines to separate and exposing the check valve. S4: Repair or disassemble the check valve.

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