Low-temperature LNG storage tank inner tank hanging basket suspension mechanism

Abstract

The utility model belongs to low temperature LNG storage tank machinery and electrical automation technical field provides a kind of low temperature LNG storage tank inner tank basket suspension mechanism, including connecting steel sheet, both ends of connecting steel sheet are fixedly connected with cover plate, cover plate one end outside is equipped with gyro wheel, cover plate both ends are equipped with bearing, the bearing is movably arranged in the cover plate, the outer surface of bearing is fixedly provided with steel pipe, the steel pipe is located in the inner chamber of cover plate, the bracket piece is fixedly installed on the cover plate upper end;The utility model is indirectly supported by gyro wheel-top reinforcing ring mode, converts basket load into axial pressure and bending moment of top reinforcing ring, reduces the local stress of inner tank wallboard, effectively prevents the instability deformation of wallboard due to direct suspension, and the overall device is simple to install, convenient to operate, and has good economy.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical and electrical automation technology of cryogenic LNG storage tanks, specifically a suspension mechanism for the inner tank basket of a cryogenic LNG storage tank. Background Technology

[0002] Cryogenic LNG (liquefied natural gas) storage tanks are large storage containers specifically designed for storing liquefied natural gas, typically used for LNG production, transportation, and terminal storage. Construction of cryogenic LNG storage tanks involves both internal and external tank work. Typically, the external tank lining is installed using a cat-head crane mounted on a track beam as a suspension point for an electric suspended platform. However, after the internal tank wall panels are installed, because the reinforcing rings of the wall panels are almost flush with the aluminum ceiling, openings must be made in the aluminum ceiling when using a conventional suspended platform for internal tank work. This makes it inconvenient to move the platform, increases the risks associated with platform installation and dismantling, and is detrimental to safety and risk management.

[0003] To address this, those skilled in the art have proposed a suspension mechanism for the inner tank basket of a cryogenic LNG storage tank, which is intended to be applied to the construction of the inner tank wall panels. This mechanism features simple installation, convenient operation, low operating costs, and reusability, thus offering good economic benefits. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a suspension mechanism for the inner tank basket of a cryogenic LNG storage tank, thereby resolving the issues raised in the background art.

[0005] A suspension mechanism for an inner tank basket of a cryogenic LNG storage tank includes a connecting steel plate, with a cover plate fixedly connected to both ends of the connecting steel plate. A roller is installed on the outer side of one end of the cover plate, and bearings are installed through both ends of the cover plate. The bearings are movably disposed in the cover plate, and a steel pipe is fixedly installed on the outer surface of the bearing. The steel pipe is located in the inner cavity of the cover plate, and a bracket is fixedly installed on the upper end of the cover plate.

[0006] Preferably, the two ends of the connecting steel plate are fixedly connected to the side of the cover plate, and the front, rear and lower ends of the cover plate are set as open. There are two sets of cover plates, located at the two ends of the connecting steel plate respectively.

[0007] Preferably, the rollers are located between the cover plate and the bracket, and are installed on the outside of the cover plate. Two sets of rollers are provided on each set of cover plates, for a total of four sets.

[0008] Preferably, the steel pipe rotates and rolls within the inner cavity of the cover plate under the action of external force via a bearing.

[0009] Preferably, the lower end of the bracket has a slot for installing the wire rope of the electric hoist.

[0010] Preferably, a top reinforcing ring is provided between the roller and the bracket, and the top reinforcing ring is a solid structure inside the cryogenic LNG storage tank; the top reinforcing ring is T-shaped, and the roller moves inside the top reinforcing ring;

[0011] An inner tank wall plate is welded to the outside of the top reinforcing ring. The inner tank wall plate is a solid structure inside the cryogenic LNG storage tank. The inner tank wall plate and the top reinforcing ring form an I-shaped structure.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention enables the suspended platform to move continuously along the circumference of the top reinforcing ring, achieving full-circumference construction of the inner wall of the storage tank. It eliminates the need for repeated disassembly and reassembly of traditional segmented suspension devices, effectively improving construction efficiency. Through the indirect load-bearing method of rollers and the top reinforcing ring, the load on the suspended platform is converted into axial pressure and bending moment on the top reinforcing ring, reducing localized stress on the inner tank wall and effectively preventing instability and deformation caused by direct suspension. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the main body of the suspended basket suspension mechanism of this utility model;

[0016] Figure 3 This is a side view of the overall structure of the present invention when it is installed inside a cryogenic LNG storage tank;

[0017] Figure 4 This invention relates to the inner tank wall panel and the top reinforcing ring.

[0018] In the picture:

[0019] 1. Connecting steel plate; 2. Cover plate; 3. Roller; 4. Bearing; 5. Steel pipe; 6. Bracket; 7. Top reinforcing ring; 8. Inner tank wall plate. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0021] As attached Figure 1 To be continued Figure 4 As shown:

[0022] Example: This utility model provides a suspension mechanism for the inner tank basket of a cryogenic LNG storage tank, including a connecting steel plate 1, with a cover plate 2 fixedly connected to both ends of the connecting steel plate 1. A roller 3 is installed on the outer side of one end of the cover plate 2, and bearings 4 are installed through both ends of the cover plate 2. The bearings 4 are movably installed in the cover plate 2, and a steel pipe 5 is fixedly installed on the outer surface of the bearings 4. The steel pipe 5 is located in the inner cavity of the cover plate 2, and a bracket 6 is fixedly installed on the upper end of the cover plate 2.

[0023] The connecting steel plate 1 is fixedly connected to the sides of the cover plate 2 at both ends. The front, rear, and lower ends of the cover plate 2 are designed to be open. There are two sets of cover plates 2, located at both ends of the connecting steel plate 1. The connecting steel plate 1 serves as a basic load-bearing component, fixing the two sets of cover plates 2 into an integral frame to ensure structural stability. The rigid connection between its two ends and the sides of the cover plate 2 can evenly transfer the load of the suspended basket to the top reinforcing ring 7, avoiding stress concentration at a single point. The cover plate 2 adopts an open design on the front, rear, and lower ends, forming a U-shaped groove structure, which not only provides rotation space for the internal bearing 4-steel pipe 5 assembly, but also enhances the resistance to lateral displacement through the fit between the opening and the top reinforcing ring 7.

[0024] Rollers 3 are located between the cover plate 2 and the bracket 6, and are installed on the outside of the cover plate 2. There are two sets of rollers 3 on each set of cover plates 2, for a total of four sets. The four sets of rollers 3 are installed on the outside of each set of cover plates 2 and roll along the T-shaped track inside the top reinforcing ring 7. This design converts the sliding friction of the suspended basket into rolling friction, significantly reducing the moving resistance, while distributing the load to the top reinforcing ring 7, avoiding direct action on the inner tank wall plate 8 and causing deformation.

[0025] The steel pipe 5 rotates and rolls within the inner cavity of the cover plate 2 under the action of external force via the bearing 4. That is, the steel pipe 5 is movably connected to the cover plate 2 via the bearing 4, and can rotate 360° within the inner cavity of the cover plate 2 under the action of external force, allowing the basket to flexibly turn in the horizontal direction to adapt to the construction requirements of the curved inner wall of the storage tank. At the same time, the precise fit of the bearing 4 can withstand radial loads, ensuring stable rotation.

[0026] The lower end of the bracket 6 has a slot for installing the wire rope of the electric suspended platform. The slot at the lower end of the bracket 6 is used to fix the wire rope of the electric suspended platform, and its upper end is rigidly connected to the cover plate 2, which transmits the tension of the wire rope to the cover plate 2-roller 3 system. The cantilever structure design of the bracket 6 can expand the effective working radius of the suspended platform suspension point and improve the construction coverage area.

[0027] A top reinforcing ring 7 is provided between the roller 3 and the bracket 6. The top reinforcing ring 7 is a solid structure inside the cryogenic LNG storage tank. The top reinforcing ring 7 is T-shaped, and the roller 3 moves inside the top reinforcing ring 7.

[0028] An inner tank wall plate 8 is welded to the outside of the top reinforcing ring 7. The inner tank wall plate 8 is a solid structure inside the cryogenic LNG storage tank, and it forms an I-shaped structure with the top reinforcing ring 7. The T-shaped section of the top reinforcing ring 7 is welded to the inner tank wall plate 8 to form an I-shaped structure. Its mechanical properties are similar to those of an I-beam. As the running track for the rollers 3, its smooth inner surface can reduce wear on the rollers 3 and extend their service life. The inner tank wall plate 8 and the top reinforcing ring 7 together form an integrated load-bearing system, distributing the load of the basket to the entire tank wall structure through the top reinforcing ring 7, thus avoiding local stress concentration.

[0029] As can be seen from the above, this device overcomes the drawback of requiring openings in the aluminum ceiling for conventional inner tank construction using suspended platforms. It employs a self-made suspension mechanism integrated into the top reinforcing ring 7, solving the problem of needing to open holes in the aluminum ceiling for conventional suspended platform use. By adjusting the single-rail trolley spacing at both ends of the suspension mechanism, it can easily accommodate various suspended platform sizes, meeting the construction needs of inner tanks and greatly improving the versatility and practicality of the construction method. Moving the suspended platform only requires moving this device within the top reinforcing ring 7; its principle is similar to using a cat-head crane as the platform's suspension point. This connector is not only easy to install but also ensures a stable and reliable connection between the trolley and the reinforcing ring, preventing safety issues such as loosening or detachment.

[0030] Example: The Shanghai LNG terminal expansion project is a major energy project and key engineering project in Shanghai, with a total receiving terminal construction scale of 6 million tons of LNG per year. The project is planned in one phase but implemented in stages. The first phase has a construction scale of 3 million tons of LNG per year, with a maximum gasification and external transmission capacity of 2.1 million cubic meters per hour, including four 220,000 cubic meter LNG storage tanks and supporting auxiliary facilities. The land area is approximately 52.49 hectares. It is planned to be completed in 2025. This tender section is for the construction of storage tanks No. 8 and No. 9 in the first phase. The construction of the inner tanks involves removing through-hole square iron and other operations, requiring the use of suspended platforms.

[0031] Process flow:

[0032] Suspended platform specifications and tooling positioning

[0033] Based on the operational requirements, accurately determine the dimensions and specifications of the required suspended platform. Using this as a basis, determine the length of the angle steel and precisely position the tooling.

[0034] Roller tooling component assembly

[0035] Bearings are installed at both ends of each group of steel pipes, and the roller components are machined on a lathe in the prefabrication yard. After completion, they are assembled with the cover plate, bearings and steel pipes to form a complete monorail trolley.

[0036] Suspension component assembly

[0037] Using the device in Embodiment 1, the two monorail trolleys are welded together by connecting steel plates and installed inside a pre-set top reinforcing ring so that they can roll smoothly.

[0038] Bracket installation

[0039] The bracket is fixed by precisely aligning it with the screw holes on the top of the monorail car, placing it on the top reinforcing ring and extending vertically to below the top reinforcing ring to form a suspended basket fixing frame; the two sets of brackets are installed with electric suspended basket wire ropes through the slots at the lower end and fixed to both ends of the suspended basket for easy lifting.

[0040] Because conventional suspended platforms are used for inner tank wall panel operations, a third-party inspection report is required for each relocation, which increases the cost of suspended platform inspection and labor. Furthermore, openings in the aluminum ceiling increase the risk of objects falling, posing numerous safety hazards and making subsequent safety management difficult. This is detrimental to both safety and cost control. This device utilizes a top reinforcing ring as a monorail track for the suspension mechanism, facilitating the use and relocation of the suspended platform. This fixture is simple to operate, easy to manage, and convenient to maintain, offering advantages such as low operating costs and excellent protective performance.

[0041] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., variations in the size, scale, structure, shape, and proportion of various elements, as well as parameter values, mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of this utility model. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0042] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A suspension mechanism for the inner tank basket of a cryogenic LNG storage tank, characterized in that: The system includes a connecting steel plate (1), with a cover plate (2) fixedly connected to both ends of the connecting steel plate (1). A roller (3) is installed on the outer side of one end of the cover plate (2). Bearings (4) are installed through both ends of the cover plate (2). The bearings (4) are movably installed in the cover plate (2). A steel pipe (5) is fixedly installed on the outer surface of the bearing (4). The steel pipe (5) is located in the inner cavity of the cover plate (2). A bracket (6) is fixedly installed on the upper end of the cover plate (2).

2. The suspension mechanism for the inner tank basket of a cryogenic LNG storage tank as described in claim 1, characterized in that: The two ends of the connecting steel plate (1) are fixedly connected to the side of the cover plate (2). The front, back and lower ends of the cover plate (2) are set as open. There are two sets of the cover plate (2), which are located at the two ends of the connecting steel plate (1).

3. The suspension mechanism for the inner tank basket of a cryogenic LNG storage tank as described in claim 2, characterized in that: The rollers (3) are located between the cover plate (2) and the bracket (6), and are installed on the outside of the cover plate (2). There are two sets of rollers (3) on each set of cover plates (2), for a total of four sets.

4. The suspension mechanism for the inner tank basket of a cryogenic LNG storage tank as described in claim 1, characterized in that: The steel pipe (5) rotates and rolls within the cavity of the cover plate (2) under the action of external force via the bearing (4).

5. The suspension mechanism for the inner tank basket of a cryogenic LNG storage tank as described in claim 1, characterized in that: The lower end of the bracket (6) is provided with a slot for installing the wire rope of the electric hoist.

6. The suspension mechanism for the inner tank basket of a cryogenic LNG storage tank as described in claim 1, characterized in that: A top reinforcing ring (7) is provided between the roller (3) and the bracket (6). The top reinforcing ring (7) is a solid structure inside the cryogenic LNG storage tank. The top reinforcing ring (7) is T-shaped, and the roller (3) moves inside the top reinforcing ring (7). An inner tank wall plate (8) is welded to the outside of the top reinforcing ring (7). The inner tank wall plate (8) is a solid structure inside the cryogenic LNG storage tank. The inner tank wall plate (8) and the top reinforcing ring (7) form an I-shaped structure.

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