Design and manufacturing construction method of anti-instability arc-shaped wall plate of liquid tank

Abstract

The invention provides a design and manufacturing construction method of an anti-instability arc-shaped wall plate of a liquid tank, and belongs to the technical field of marine industry. The design method of the anti-instability liquid tank arc-shaped wall plate comprises the steps that a simulation model of the anti-instability liquid tank arc-shaped wall plate is constructed firstly, then simulation evaluation is conducted on the bearing capacity of the constructed simulation model, the bearing capacity of the simulation model is analyzed, and the anti-instability liquid tank arc-shaped wall plate is an arc-shaped bulkhead with curvature instead of a flat bulkhead. The concave face of the arc-shaped bulkhead bears pressure, and the arc-shaped bulkhead is welded to a hull plate. The manufacturing construction method of the anti-instability arc-shaped wall plate of the liquid tank comprises a preliminary forming process and process, a subsequent welding process and process and a surface and overall treatment process and process. The problems that a traditional liquid tank wall plate structure is prone to losing stability, and additional weight needs to be increased when rigidity is increased are solved, the defects existing in traditional design are overcome, and the stability and safety in the taking process of liquid in a tank are improved.

Description

Technical Field

[0001] The invention relates to a design and manufacturing construction method of a liquid tank wall plate, in particular to a design and manufacturing construction method of an anti-instability liquid tank arc wall plate, and belongs to the technical field of marine industry. Background Art

[0002] The traditional liquid tank wall structure is usually a flat plate frame structure, and this design is widely used in hull manufacturing. However, this flat plate structure is easily affected by construction defects, especially concave defects, which leads to uneven wall strength, resulting in instability when the liquid is pumped, which in turn causes bad noise and may even pose a potential threat to the safety of the ship. In response to the above problems, the traditional solution is usually to thicken or reinforce the wall to improve its strength and stability. However, this method will increase the weight and complexity of the structure, resulting in the overall performance of the ship being affected, and increasing the workload and cost of construction. Therefore, it has become an urgent need to seek a new design that can improve the stability of the wall without increasing the structural burden and construction workload. Based on the above background, the present invention proposes a design and manufacturing construction method for an anti-instability liquid tank arc wall panel, which not only meets actual engineering needs, but also has important application value. Summary of the invention

[0003] In order to solve the problem that the traditional liquid tank wall panel structure is easy to become unstable and additional weight is needed to increase the rigidity, the present invention further proposes a design and manufacturing construction method of an anti-instability liquid tank arc wall panel, overcomes the defects of the traditional design, and improves the stability and safety of the liquid extraction process in the tank.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] A method for designing an arc-shaped wall plate for an anti-destabilization liquid tank comprises the following steps: firstly constructing a simulation model of the arc-shaped wall plate for an anti-destabilization liquid tank, then conducting a simulation evaluation on the load-bearing capacity of the constructed simulation model, and analyzing the load-bearing capacity to determine the arch height of the arc-shaped wall plate. The arc-shaped wall plate for an anti-destabilization liquid tank is an arc-shaped bulkhead with a curvature instead of a flat bulkhead, the concave surface of the arc-shaped bulkhead is under pressure, and the arc-shaped bulkhead is welded to a hull plate.

[0006] Furthermore, the load-bearing capacity simulation evaluation specifically includes: constructing a finite element model of the simulation model, going through a three-dimensional data transfer array planning, initial and boundary condition setting and load-bearing condition setting process, extracting the stress-strain history curve through a post-processing interface, and analyzing the load-bearing capacity for simulation evaluation.

[0007] A method for manufacturing and constructing an arc-shaped wall plate for an anti-destabilization liquid tank, wherein the arc-shaped wall plate for an anti-destabilization liquid tank is designed according to a design method for an arc-shaped wall plate for an anti-destabilization liquid tank, and the manufacturing and construction method is implemented by the following steps:

[0008] S1: Preliminary forming process and technology, austenitizing the material for preparing the arc-shaped wall plate of the anti-instability liquid tank, then accurately cutting the stainless steel plate, and after cutting, performing arc rolling on the stainless steel plate to form the required arc shape, and performing stress relief annealing and heat preservation after arc rolling;

[0009] S2: Subsequent welding process and technology, trimming the arc-shaped wall plate of the anti-instability liquid tank initially formed by arc rolling in S1 to ensure surface smoothness and flatness, then determining the installation position of the anti-instability liquid tank arc-shaped wall plate on the hull, fixing the anti-instability liquid tank arc-shaped wall plate at the predetermined installation position, cleaning the welding area, and welding the anti-instability liquid tank arc-shaped wall plate to the hull shell plate;

[0010] S3: Surface and overall treatment process and technology. Immediately after welding, the arc-shaped wall panels of the anti-instability liquid tank are subjected to stress relief heat treatment by local heat treatment, and then the welds are fully inspected to ensure that the welding quality meets the standards.

[0011] Furthermore, the austenitizing condition in S1 is to keep the temperature at 1200° C. for 4 hours.

[0012] Furthermore, the temperature of the stress relief annealing treatment in S1 is 650° C., and the insulation time is 36 hours.

[0013] Furthermore, the welding method described in S2 is GMAW welding, and the welding voltage and current of the GMAW welding are 20V and 160A respectively.

[0014] Furthermore, the stress relief heat treatment in S3 is performed at a temperature of 200° C. to 250° C. and a heat preservation time of 4 hours.

[0015] Furthermore, the comprehensive inspection method described in S3 includes visual inspection, magnetic particle inspection and ultrasonic inspection.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention improves the stability and safety of the liquid extraction and pumping process in the tank by designing an anti-instability liquid tank arc wall structure, while avoiding the addition of additional heavy objects such as ring ribs, simplifying the manufacturing process, and significantly reducing costs.

[0018] 2. The anti-instability liquid tank arc wall plate structure designed by the present invention has an average instability pressure doubled compared with a traditional flat plate frame liquid tank of the same weight, and no instability occurs within the design pressure range of the liquid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a cross-sectional view of an embodiment of a liquid tank formed by an arc-shaped wall plate of an anti-instability liquid tank of the present invention;

[0020] Figure 2 It is a schematic diagram of the test results of the bearing capacity of the arc-shaped wall panel structure of the anti-instability liquid tank of the present invention.

[0021] In the figure: 1. arc-shaped top cover plate of anti-instability liquid tank; 2. arc-shaped longitudinal wall plate of anti-instability liquid tank; 3. arc-shaped reinforcement ribs of top cover plate; 4. arc-shaped reinforcement ribs of longitudinal wall plate; 5. hull plate; 6. top cover plate of traditional flat plate frame type liquid tank; 7. longitudinal wall plate of traditional flat plate frame type liquid tank. DETAILED DESCRIPTION

[0022] Specific implementation method 1: Combination Figure 1 and Figure 2 This embodiment is described. The design method of the arc wall plate of the anti-destabilization liquid tank described in this embodiment first constructs a simulation model of the arc wall plate of the anti-destabilization liquid tank. Specifically, the three-dimensional solid structure of the arc wall plate of the anti-destabilization liquid tank can be constructed by using three-dimensional modeling software, and then the load-bearing capacity of the constructed simulation model is simulated and evaluated to analyze its load-bearing capacity. The load-bearing capacity simulation evaluation specifically includes: constructing a finite element model of the simulation model, going through the three-dimensional data transmission array planning, initial and boundary condition setting and load-bearing condition setting process, extracting the stress-strain history curve through the post-processing interface, and analyzing the load-bearing capacity for simulation evaluation. Specifically, the finite element simulation software can be used, combined with the three-dimensional solid structure of the arc wall plate of the anti-destabilization liquid tank, to simulate and evaluate its load-bearing capacity, which mainly includes the processes of three-dimensional data transmission array planning, initial and boundary condition setting, load-bearing condition setting, etc., extracting the stress-strain history curve through the post-processing interface, and analyzing its load-bearing capacity. Through simulation calculation and comparative analysis of the relationship between the span length, arch height and other parameters of different arc wall plates and the load-bearing stability, the arch height of the arc wall plate is determined in combination with the space layout restrictions of the tank area.

[0023] The arc-shaped wall plate of the anti-instability liquid tank is an arc-shaped bulkhead with curvature instead of a flat bulkhead. The concave surface of the arc-shaped bulkhead bears pressure. An arc-shaped bulkhead with a certain curvature is used instead of a flat bulkhead. The concave surface of the arc-shaped bulkhead bears pressure to increase the instability resistance. The arc-shaped bulkhead is welded to the hull plate, and the bulkhead and the shell are connected by welding. Preferably, when used in actual engineering, the ratio of 100mm to 2300mm span length of the wall plate and 6500mm curvature radius is taken, and the stability and safety are high.

[0024] like Figure 1As shown, a cross-sectional view of an embodiment of a liquid tank composed of an anti-destabilization liquid tank arc-shaped wall plate, the liquid tank comprises a cabin space composed of two hull plates, one anti-destabilization liquid tank arc-shaped longitudinal wall plate and one anti-destabilization liquid tank arc-shaped top cover plate, the anti-destabilization liquid tank arc-shaped longitudinal wall plate and the anti-destabilization liquid tank arc-shaped top cover plate are welded to the hull plates. The anti-destabilization liquid tank arc-shaped longitudinal wall plate and the anti-destabilization liquid tank arc-shaped top cover plate are welded to each other.

[0025] The concave surfaces of the arc-shaped longitudinal wall plate and the arc-shaped top cover plate of the anti-instability liquid tank face the inner side of the liquid tank body space, so as to withstand the pressure of the liquid in the liquid tank.

[0026] A method for manufacturing and constructing an arc-shaped wall plate for an anti-destabilization liquid tank, wherein the arc-shaped wall plate for an anti-destabilization liquid tank is designed according to the design method for an anti-destabilization liquid tank arc-shaped wall plate, and the manufacturing and constructing method is implemented by the following steps:

[0027] S1: Preliminary forming process and technology, the material for preparing the arc-shaped wall panel of the anti-instability liquid tank is austenitized. Preferably, the austenitization condition is to keep warm at 1200℃ for 4h to completely austenitize. Then the stainless steel sheet is precisely cut, and after cutting, the stainless steel sheet is subjected to arc rolling to form the required arc shape, and stress relief annealing is performed after arc rolling and insulation. Preferably, the temperature of the stress relief annealing treatment is 650℃, and the insulation time is 36h to reduce the risk of deformation during welding. Preferably, the material of the arc-shaped wall panel is stainless steel, but it is not limited to stainless steel. Different steels can be selected according to different requirements such as the use environment of the liquid tank and the stored liquid.

[0028] S2: Subsequent welding processing flow and technology, trimming the arc-shaped wall panels of the anti-instability liquid tank that were initially formed by arc rolling in S1, the trimming includes removing processing marks, grinding edges, etc., to ensure surface finish and flatness. Afterwards, the installation position of the arc-shaped wall panels of the anti-instability liquid tank is determined on the hull, the arc-shaped wall panels of the anti-instability liquid tank are fixed at the predetermined installation position, the welding area is cleaned, and the arc-shaped wall panels of the anti-instability liquid tank are welded to the hull plate. The welding method is GMAW welding, and the welding voltage of the GMAW welding is 20V and the current is 160A. The welding efficiency is high, the degree of automation is high, the welding quality is high, and the universality is good.

[0029] S3: Surface and overall treatment process and technology. Immediately after welding, the arc-shaped wall plate of the anti-instability tank is subjected to stress relief heat treatment by means of local heat treatment such as attaching a heating plate. Preferably, the temperature of the stress relief heat treatment is 200℃~250℃, and the holding time is 4 hours to reduce welding residual stress. After that, the weld is fully inspected. Preferably, the comprehensive inspection method includes visual inspection, magnetic particle inspection and ultrasonic inspection. The weld is fully inspected to ensure that the welding quality meets the standards.

[0030] Specifically, the anti-instability liquid tank curved wall panel is realized from design to manufacturing and construction through the following steps:

[0031] Step 1: Use 3D modeling software to construct the 3D solid structure of the anti-instability tank curved wall plate, and use a curved bulkhead with a certain curvature instead of a flat bulkhead, where the concave surface of the curved wall plate bears pressure to increase instability resistance. The bulkhead and the shell are connected by welding.

[0032] Step 2: Using finite element simulation software, combined with the three-dimensional solid structure of the curved wall panel of the anti-instability liquid tank involved in step 1, a simulation evaluation is carried out on its bearing capacity, which mainly includes the planning of three-dimensional data transfer array, setting of initial and boundary conditions, setting of bearing conditions, etc. The stress-strain history curve is extracted through the post-processing interface to analyze its bearing capacity.

[0033] Step 3: Preliminary forming process and technology, keep the material at 1200℃ for 4h to completely austenitize. Use CNC cutting machine to accurately cut the stainless steel plate according to the drawing size. Use three-roller rolling machine to roll the stainless steel plate to form the required arc shape. After rolling, stress relief annealing treatment is carried out at 650℃ and kept for 36h to reduce the risk of deformation during welding.

[0034] Step 4: Subsequent welding process and technology, make necessary finishing to the arc-formed wall panels, such as removing processing marks, grinding edges, etc., to ensure surface finish and flatness. Determine the installation position of the wall panels on the hull, and use clamps or positioning devices to fix the wall panels in the predetermined position. Clean the welding area and remove impurities such as oil and rust. Preheat at 250℃ to prevent weld cracking, and use GMAW welding for welding. The welding process is 20V voltage and 160A current.

[0035] Step 5: Surface and overall treatment process and technology. Immediately after welding, place the wall panel in a holding furnace and keep it at 200℃~250℃ for 4 hours to perform stress relief heat treatment to reduce welding residual stress. Use visual inspection (VT), magnetic particle inspection (MT) and ultrasonic inspection (UT) and other methods to conduct a comprehensive inspection of the weld to ensure that the welding quality meets the standards.

[0036] like Figure 2 The figure shows a schematic diagram of the test results of the bearing capacity of the arc-shaped wall panel structure of the anti-instability liquid tank of the present invention. The left side of the figure shows the arc-shaped wall panel liquid tank, and the right side of the figure shows the flat plate frame liquid tank. A full-scale arc-shaped wall panel liquid tank model was built, and a pump pressure relief test simulating the liquid extraction condition inside the liquid tank was carried out to test the stress and deformation of the arc-shaped wall panel. The test results were compared with the simulation calculation results to verify that the arc-shaped wall panel does not become unstable within the design pressure range. MN is the minimum value of the simulated stress, and MX is the maximum value of the simulated stress. After testing, the arc-shaped wall panel structure of the anti-instability liquid tank designed by the present invention has an average instability pressure that is about 1 times higher than that of a traditional flat plate frame liquid tank of the same weight, and does not become unstable within the design pressure range of the liquid tank.

[0037] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for designing an arc-shaped wall plate for an anti-instability liquid tank, characterized in that: First, a simulation model of the curved wall plate of the anti-instability liquid tank is constructed, and then a simulation evaluation is performed on the bearing capacity of the constructed simulation model. The bearing capacity is analyzed to determine the arch height of the curved wall plate. The curved wall plate of the anti-instability liquid tank is a curved bulkhead with curvature instead of a flat bulkhead. The concave surface of the curved bulkhead is under pressure, and the curved bulkhead is welded to the hull plate.

2. The design method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 1 is characterized by: The load-bearing capacity simulation evaluation specifically includes: constructing a finite element model of the simulation model, going through a three-dimensional data transfer array planning, initial and boundary condition setting and load-bearing condition setting process, extracting stress-strain history curves through a post-processing interface, and analyzing the load-bearing capacity for simulation evaluation.

3. A method for manufacturing and constructing an arc-shaped wall plate for an anti-instability liquid tank, characterized in that: The anti-destabilization liquid tank arc-shaped wall plate is designed according to the design method of the anti-destabilization liquid tank arc-shaped wall plate according to claim 1 or 2, and the manufacturing and construction method is realized by the following steps: S1: Preliminary forming process and technology, austenitizing the material for preparing the arc-shaped wall plate of the anti-instability liquid tank, then accurately cutting the stainless steel plate, and after cutting, performing arc rolling on the stainless steel plate to form the required arc shape, and performing stress relief annealing and heat preservation after arc rolling; S2: Subsequent welding process and technology, trimming the arc-shaped wall plate of the anti-instability liquid tank initially formed by arc rolling in S1 to ensure surface smoothness and flatness, then determining the installation position of the anti-instability liquid tank arc-shaped wall plate on the hull, fixing the anti-instability liquid tank arc-shaped wall plate at the predetermined installation position, cleaning the welding area, and welding the anti-instability liquid tank arc-shaped wall plate to the hull shell plate; S3: Surface and overall treatment process and technology. Immediately after welding, the arc-shaped wall panels of the anti-instability liquid tank are subjected to stress relief heat treatment by local heat treatment, and then the welds are fully inspected to ensure that the welding quality meets the standards.

4. The manufacturing and construction method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 3 is characterized by: The austenitizing conditions described in S1 are to maintain the temperature at 1200°C for 4 hours.

5. The manufacturing and construction method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 3 is characterized by: The temperature of the stress relief annealing treatment in S1 is 650° C., and the insulation time is 36 hours.

6. The manufacturing and construction method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 3 is characterized by: The welding method described in S2 is GMAW welding, and the welding voltage and current of the GMAW welding are 20V and 160A respectively.

7. The manufacturing and construction method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 3 is characterized by: The temperature of the stress relief heat treatment in S3 is 200° C. to 250° C., and the heat preservation time is 4 hours.

8. The manufacturing and construction method of the arc-shaped wall plate of the anti-instability liquid tank according to claim 3 is characterized by: The comprehensive inspection methods described in S3 include visual inspection, magnetic particle inspection and ultrasonic inspection.

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