Manufacturing method and welding equipment of LNG (Liquefied Natural Gas) storage tank

Abstract

The invention discloses a manufacturing method of an LNG storage tank, the manufacturing method is used for manufacturing the LNG storage tank, the manufactured LNG storage tank comprises an inner lining layer and a shell layer, the outer side of the inner lining layer is coaxially sleeved with the shell layer, horn-shaped first through openings are formed in the axis positions of the two ends of the inner lining layer, and straight-barrel-shaped second through openings are formed in the axis positions of the two ends of the shell layer. According to the detachable and maintainable LNG storage tank, the shell layer and the lining layer which are separated are arranged and assembled with the mounting end and the reinforcing layer to form the detachable and maintainable LNG storage tank, and the problem that a gap exists between the lining and the shell layer, so that a combined structure is not firm is solved; the machining precision is improved in cooperation with welding equipment, the effect of facilitating assembly and later maintenance is achieved, the maintenance cost is greatly reduced, a protection structure is formed by a protection rod, an installation nut, a short shaft ring buckle and a cable piece, the structural connection strength of the shell layer is enhanced, the protection effect is provided, and the safety is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of storage tank processing, and in particular to an LNG storage tank and a manufacturing method thereof. Background Art

[0002] LNG storage tanks are containers for storing liquefied natural gas. The freezing point of liquefied natural gas is relatively low, so the cold preservation performance of LNG storage tanks is a key indicator. Existing LNG storage tanks generally include an inner shell cylinder and an outer shell cylinder, and a connecting support is provided between the inner shell cylinder and the outer shell cylinder, and the gap between the inner shell cylinder and the outer shell cylinder is filled with insulation material. In order to ensure safety and require high strength, the prior art also records a method for preparing the connecting support using a fiber winding (FW) method.

[0003] For example, the Chinese invention patent with application number 201910474971.2 discloses a method for manufacturing a storage tank, which is a method for manufacturing a storage tank by winding multiple layers of fibers impregnated with resin on the periphery of the inner liner, including: annularly winding the fibers impregnated with the resin to stack multiple annular layers; and spirally winding the fibers impregnated with resin in a manner that covers the annular layers to stack multiple spiral layers. When stacking multiple spiral layers, the temperature of the fibers impregnated with the resin is adjusted to be above 40°C and below 60°C. It can be seen from the description of the scheme and the drawings in the description that the inner liner and the outer shell layer in the scheme are both integrated structures.

[0004] In actual production, assembly is difficult, and gaps are likely to exist between the inner lining and the outer shell, which makes the inner lining and the outer shell not firm and prone to collision during transportation; if welding is used to integrate the above-mentioned outer shell structure, there is also the problem of inconvenience in later maintenance, which increases the maintenance cost; during use, due to the lack of protective mechanisms, there are safety hazards when the storage tank is hit or tipped over.

[0005] Therefore, it is necessary to invent LNG storage tanks and manufacturing methods thereof to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an LNG storage tank and a method for manufacturing the same, so as to solve the above-mentioned deficiencies mentioned in the background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a manufacturing method of an LNG storage tank, which is used for preparing an LNG storage tank, wherein the manufactured LNG storage tank comprises an inner lining layer and an outer shell layer, and the outer shell layer is coaxially sleeved on the outer side of the inner lining layer, a trumpet-shaped first opening is opened at the axial position of both ends of the inner lining layer, a straight-cylindrical second opening is opened at the axial position of both ends of the outer shell layer, and a mounting end is provided between the corresponding first opening and second opening, a threaded hole is opened at the axial center of the mounting end for connecting to a gas transmission pipeline, and a rubber gasket is provided on the outer side of the mounting end, a reinforcement layer is provided between the outer wall of the inner lining layer and the inner wall of the outer shell layer, the outer shell layer comprises a sleeve and an arched upper cover and a lower cover, and the upper cover and the lower cover are respectively arranged on the top and the bottom of the sleeve, the upper cover is welded and fixed to the sleeve, and the lower cover and the sleeve are detachable and installable, and the sleeve A first limiting ring is welded on the outer side of both ends of the cylinder, a second limiting ring is welded on the outer side of one end of the upper cover and the lower cover close to the sleeve, and the corresponding first limiting ring is connected to the second limiting ring through a combined clamp, a third limiting ring is fixedly connected to the top end of the inner side of the sleeve, a fourth limiting ring is fixedly connected to the bottom end of the inner side of the upper cover, and the corresponding third limiting ring is bound by a clamp, and a uniformly distributed support seat is integrally provided on the outer side of the combined clamp, and a through hole is opened on the surface of the support seat, and a protective rod is commonly inserted into two through holes on the vertically opposite support seats, and threaded sections are provided at both ends of the outer side of the protective rod, and mounting nuts are threadedly connected to the outer side of the threaded section of the protective rod, and short shaft buckles are rotatably connected at the axis of both ends of the protective rod, and cable parts are diagonally penetrated between the multiple short shaft buckles, and the braided structure of the cable parts is in contact with the upper cover or the lower cover; The specific manufacturing process of LNG storage tanks is as follows: Step 1: Prepare and pre-process parts, use aluminum alloy plate to extrude and form an integral lining layer, and punch out circular and rectangular contours on the stainless steel plate according to the actual processing size, then perform multiple and progressive stamping deformation and punching operations on the circular contour of the cut stainless steel plate to punch out the shape of the upper cover and the lower cover, and perform roll deformation on the rectangular contour of the cut stainless steel plate to pre-form the shape of the sleeve, and then weld its interface parts, clean the solder after welding, and polish it for use; Step 2: Coaxially sleeve the first limiting rings at both ends of the outer side of the sleeve, coaxially sleeve the second limiting rings at the outer sides of the upper cover and the lower cover close to the sleeve, coaxially sleeve the third limiting ring at the top of the inner side of the sleeve, and use welding equipment to weld the above sleeve joints together, clean the solder after welding, and prepare a combined clamp that matches the combination of the first limiting ring and the second limiting ring, and a clamp that matches the combination of the third limiting ring and the fourth limiting ring; Step 3: Use welding equipment to weld the weld seams on the outer side of the upper cover and the sleeve. Before welding, use a clamping ring to fix the inner side of the combination of the third limiting ring and the fourth limiting ring. Then put the combination of the upper cover and the sleeve on the welding area of ​​the welding equipment. Use a welding gun to weld the connection between the first limiting ring and the second limiting ring. After welding, clean the solder and then remove it for installation. Step 4: Wind a reinforcement layer around the outer side of the inner lining layer, and then insert the two mounting ends into the two second openings of the upper cover and the lower cover respectively, insert the inner lining layer with the reinforcement layer into the combination of the upper cover and the sleeve, and then dock the lower cover at its bottom; Step 5: Clamp the combined clamps on the outer sides of the connection between the two first limiting rings and the second limiting rings respectively, and sleeve the rubber gasket on the inner side of the combined clamps. On the support seat between the two combined clamps, insert the protective rods in the two through holes in a vertically opposite manner, and tighten them with the mounting nuts at both ends, so that the protective rods can tightly combine the sleeve, the upper cover and the lower cover structure; Step 6: Weld ear plates in a circular array at the bottom of the lower cover to install the support legs and support the LNG storage tank; Step 7: Use cable parts to weave diagonally between multiple short shaft buckles to form a protective net structure, and use the protective net to contact and tighten with the upper cover or lower cover to enhance structural strength and external protection.

[0008] As a preferred embodiment of the present invention, the combined clamp is composed of two semi-ring clamps that are symmetrically distributed, and the inner side of the semi-ring clamps is provided with grooves that match the contours of the first limiting ring and the second limiting ring. Circular holes are penetrated on both sides of the two semi-ring clamps, and the first bolt is commonly connected to the two corresponding circular holes.

[0009] As a preferred solution of the present invention, the number of support seats on each semi-ring clamping plate is set to five, and the number of ear plates is set to four, the number interval of the cable parts when inserted through the short shaft ring buckle is five, and the protective net does not contact the ear plates.

[0010] The welding equipment for manufacturing LNG storage tanks is used for welding in step 2 and step 3 of the manufacturing method of LNG storage tanks as described above, and includes a welding chassis and a gantry, and the welding chassis and the gantry are fixedly assembled by screws, and both sides of the top of the welding chassis are fixedly connected with parallel first slide rails, and a platen is movably connected between the tops of the two first slide rails, and a hydraulic lift is installed on the top of the platen, and at least two frame groove plates are installed on the top placement platform of the hydraulic lift, and the inner side of the frame groove plate is provided with a supporting and driving mechanism, which is used to lift the parts to be welded and transmit them to realize self-rotation; A support plate fixedly connected to the platen is provided on one side of the hydraulic lift, a control box is installed on one side of the top of the welding chassis, the control box is electrically connected to the electrical components and is used to control the operation of the equipment, and a straightening mechanism is provided on the opposite side of the control box and the support plate, and the straightening mechanisms on both sides are respectively fitted and supported on the inner and outer sides of the parts to be welded, so as to accurately dock and horizontally straighten the parts to be welded, and a height adjustment mechanism is provided between the straightening mechanism and the control box or the support plate, so as to adjust the height of the straightening mechanisms on both sides so that the axis of the straightening mechanism is in line with the axis of the parts to be welded; A second slide rail is provided on the top of the gantry, and a crossbeam is movably connected to the second slide rail. A positioning mechanism is installed on one side of the crossbeam, and a welding gun body is installed on the front of the positioning mechanism. The positioning mechanism is used to adjust the lateral position, longitudinal height and welding angle of the welding gun body. A welding system is provided at the connecting end of the welding gun body.

[0011] As a preferred solution of the present invention, the supporting and driving mechanism includes two adjustment seats slidably connected in each frame slot plate, and the two adjustment seats in the same frame slot plate are symmetrically distributed, the inner side of the end of the adjustment seat is rotatably connected to a roller, the outer side wall of the adjustment seat is fixedly connected to a first driving motor at a position corresponding to the axis of the roller, and the output shafts of the multiple first driving motors are respectively connected to the multiple rollers in the same direction; A bidirectional screw rod is rotatably connected to the top end of the frame slot plate, and the bidirectional screw rod passes through two adjustment seats and is threadedly connected to the through hole. A torsion disc is provided at one end of the bidirectional screw rod.

[0012] As a preferred embodiment of the present invention, the straightening mechanism includes a three-jaw chuck, and an L-shaped frame plate is fixedly connected to the output block of the three-jaw chuck by screws, a slot is provided at the end of the L-shaped frame plate, and an L-shaped extension plate is slidably connected in the slot, a plurality of evenly distributed first axial holes are provided on the surface of the L-shaped extension plate, and a second axial hole is provided at the end of the L-shaped frame plate, the second axial hole is coaxially docked with one of the first axial holes and is installed and limited by a second bolt.

[0013] As a preferred solution of the present invention, a bonding plate is detachably mounted on the L-shaped extension plate, and the bonding plates on both sides respectively match the inner and outer side walls of the parts to be welded.

[0014] As a preferred solution of the present invention, the height adjustment mechanism includes a fixed plate for installing a third slide rail, the fixed plate is installed on a control chassis or a support plate, a second drive motor is fixedly connected to the top of the fixed plate, and the output end of the second drive motor is transmission-connected to a threaded rod, an adjustment block is threadedly sleeved on the outer side of the threaded rod, a lifting plate is installed on the side of the adjustment block, and a three-jaw chuck is installed on the lifting plate.

[0015] As a preferred embodiment of the present invention, the positioning mechanism includes a longitudinal mounting beam plate, a fourth slide rail is fixedly connected to the front side of the cross beam, and the longitudinal mounting beam plate is slidably connected to the fourth slide rail, a fifth slide rail is fixedly connected to the front side of the longitudinal mounting beam plate, and a welding mechanism mounting plate is slidably connected to the fifth slide rail, and the welding gun body is rotatably mounted on the welding mechanism mounting plate, a driving motor is fixedly mounted on the welding mechanism mounting plate, and the output shaft of the driving motor drives the welding gun body and causes it to swing to adjust the inclination angle.

[0016] As a preferred solution of the present invention, hydraulic cylinders are arranged between the platen and the welding chassis, between the crossbeam and the gantry, between the longitudinal mounting beam plate and the crossbeam, and between the welding mechanism mounting plate and the longitudinal mounting beam plate, and the output ends of the plurality of hydraulic cylinders respectively drive the platen, the crossbeam, the longitudinal mounting beam plate and the welding mechanism mounting plate to move; A hydraulic mechanism for providing kinetic energy is provided at the connecting end of the hydraulic cylinder, and the hydraulic mechanism is electrically connected to the control box.

[0017] In the above technical solution, the technical effects and advantages provided by the present invention are: 1. By setting up a separate outer shell layer and inner lining layer and assembling them with the installation end and reinforcement layer to form a detachable and maintainable LNG storage tank, the problem of the gap between the inner lining and the outer shell layer causing the combined structure to be unstable is solved. In addition, the auxiliary installation of multiple limit rings and combined clamps and clamps is coordinated with welding equipment to improve the processing accuracy, achieve the effect of facilitating assembly and later maintenance, and greatly reduce the maintenance cost. The protective structure is composed of protective rods, mounting nuts, short shaft buckles and cable parts, and the structural connection strength of the outer shell layer is enhanced, and the protective effect is provided, so that the safety is greatly improved and it is easy to promote and use; 2. The outer shell layer is processed by the welding equipment provided by the present invention. According to the inner and outer diameters of the parts to be welded, the extension lengths of the L-shaped extension plates of the aligning mechanisms on both sides are adjusted respectively. The parts to be welded are installed between the aligning mechanisms on both sides, so that the aligning mechanisms on both sides can clamp the two sides of the parts to be welded, and the L-shaped extension plates on both sides and the bonding plates on the outer sides thereof are respectively located on the inner and outer sides of the parts to be welded, and multiple parts to be welded are precisely docked, so that the parts to be welded are horizontally aligned, and there will be no displacement or vibration between the parts to be welded, and the error caused by gravity or vibration during the welding process is reduced, so that the welding stability is greatly improved, and the parts to be welded are rotated in the torsion direction of the roller to realize self-rotation, so as to realize uniform and fully covered welding at the weld, ensure that the welding points move uniformly along the weld track, improve the welding quality, and the connection strength of the structure after welding is greatly improved compared with the prior art, and the appearance quality is good; 3. By rotating the torsion plate to rotate the bidirectional screw, the two adjustment seats on both sides are moved relative to each other, and the distance between the two rollers is changed, so that it is suitable for parts to be welded with different diameters. A height adjustment mechanism is provided between the alignment mechanism and the control chassis or the support plate, which is used to adjust the height of the alignment mechanism on both sides so that the axis of the alignment mechanism is in line with the axis of the parts to be welded, which is convenient for the production of LNG storage tanks with different diameters, improves the applicability of the equipment, and facilitates the processing and use of LNG storage tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 This is an exploded view of the assembly parts for processing LNG storage tanks from the first perspective of the present invention; Figure 2 This is an exploded view from a second perspective of the assembly parts for processing LNG storage tanks according to the present invention; Figure 3 This is an exploded view from a third perspective of the assembly parts for processing LNG storage tanks according to the present invention; Figure 4 This is an exploded view of the outer shell assembly accessories of the present invention from a first perspective; Figure 5 An exploded view of the outer shell assembly accessories of the present invention from a second perspective; Figure 6 This is a first perspective stereogram of the LNG storage tank (assembly) of the present invention; Figure 7 A second perspective view of the LNG storage tank (assembly) of the present invention; Figure 8 This is a front view of the LNG storage tank (assembly) of the present invention; Fig. 9 It is a top view of the LNG storage tank (assembly) of the present invention; Fig.10 It is a bottom view of the LNG storage tank (assembly) of the present invention; Fig.11 For the present invention Figure 6 A cutaway structural stereogram of the structure shown; Fig.12 For the present invention Figure 7 A cutaway structural stereogram of the structure shown; Fig.13 For the present invention Fig.12 a front view of the structure shown; Fig.14A first-view stereoscopic diagram of the overall structure of the welding equipment provided by the present invention; Fig.15 A second perspective stereoscopic view of the overall structure of the welding equipment provided by the present invention; Fig.16 A front view of the overall structure of the welding equipment provided by the present invention; Fig.17 A top view of the overall structure of the welding equipment provided by the present invention; Fig.18 It is a three-dimensional diagram of the assembly structure of the hydraulic lifter, frame slot plate, and supporting and driving mechanism of the present invention; Fig.19 It is a front view of the assembly structure of the hydraulic lifter, frame slot plate, and supporting and driving mechanism of the present invention; Fig. 20 It is a three-dimensional diagram of the assembly structure of the straightening mechanism and the height adjustment mechanism of the present invention.

[0020] Description of reference numerals: Inner lining layer-01; outer shell layer-02; mounting end-03; reinforcement layer-04; combined clamp-05; clamp-06; protection rod-07; mounting nut-08; short shaft buckle-09; cable piece-010; ear plate-011; Sleeve-021; upper cover-022; lower cover-023; first limiting ring-024; second limiting ring-025; third limiting ring-026; fourth limiting ring-027; Support seat-051; half ring clamp-052; first bolt-053; Welding chassis-1; gantry-2; first slide rail-3; cart-4; hydraulic lift-5; frame slot plate-6; supporting and driving mechanism-7; welding gun body-8; support plate-9; control box-10; straightening mechanism-11; height adjustment mechanism-12; second slide rail-13; crossbeam-14; position adjustment mechanism-15; Adjusting seat-71; roller-72; first driving motor-73; bidirectional screw rod-74; Three-jaw chuck-111; L-shaped frame plate-112; clamping groove-113; L-shaped extension plate-114; first shaft hole-115; second bolt-116; The third slide rail 121; the fixing plate 122; the second driving motor 123; the threaded rod 124; the adjusting block 125; the lifting plate 126; Longitudinal mounting beam plate-151; fourth slide rail-152; fifth slide rail-153; mounting plate-154. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The present invention provides Figure 1-20 The manufacturing method of the LNG storage tank shown is used to prepare the LNG storage tank. The manufactured LNG storage tank includes an inner lining layer 01 and an outer shell layer 02. The outer shell layer 02 is coaxially sleeved on the outer side of the inner lining layer 01. The inner lining layer 01 is provided with a trumpet-shaped first opening at the axial center position at both ends. The outer shell layer 02 is provided with a straight-cylindrical second opening at the axial center position at both ends. A mounting end 03 is provided between the corresponding first opening and the second opening. A threaded hole is provided at the axial center of the mounting end 03 for connecting to a gas pipeline. When installing the gas pipeline, pay attention to the connection strength to avoid excessive pressure. There is a hidden danger of gas leakage or even explosion, and a sealing ring is provided at the connection between the gas transmission pipeline and the installation end 03. A rubber gasket is provided on the outside of the installation end 03 to seal the inner lining layer 01 and the outer shell layer 02 to prevent gas leakage. A reinforcing layer 04 is provided between the outer wall of the inner lining layer 01 and the inner wall of the outer shell layer 02. The outer shell layer 02 includes a sleeve 021 and an arched upper cover 022 and a lower cover 023. The upper cover 022 and the lower cover 023 are respectively arranged on the top and bottom of the sleeve 021. The upper cover 022 is fixed to the sleeve 021 by welding, and the lower cover 023 and the sleeve 021 can be Disassembly and installation, the outer sides of both ends of the sleeve 021 are welded with a first limiting ring 024, the outer sides of the upper cover 022 and the lower cover 023 close to the sleeve 021 are welded with a second limiting ring 025, the corresponding first limiting ring 024 and the second limiting ring 025 are connected by a combined clamp 05, the top end of the inner side of the sleeve 021 is fixedly connected with a third limiting ring 026, the inner bottom end of the upper cover 022 is fixedly connected with a fourth limiting ring 027, the corresponding third limiting ring 026 and the fourth limiting ring 027 are bound by a clamp 06, the clamp 06 is made of plastic material, and the combined clamp 05 is connected with the second limiting ring 025. The outer side of the hoop 05 is integrally provided with evenly distributed support seats 051, and the surface of the support seats 051 is provided with through holes, and the two through holes on the vertically opposite support seats 051 are commonly plugged with a protective rod 07, and a sponge layer can be added to the outer side of the protective rod 07, and threaded sections are provided at both ends of the outer side of the protective rod 07, and the outer side of the threaded section of the protective rod 07 is threadedly connected with a mounting nut 08, and short shaft buckles 09 are rotatably connected at the axis of both ends of the protective rod 07, and a plurality of short shaft buckles 09 are diagonally penetrated with cable parts 010, and the braided structure of the cable parts 010 is in contact with the upper cover 022 or the lower cover 023; The specific manufacturing process of LNG storage tanks is as follows: Step 1: Prepare and pre-process parts, use aluminum alloy plate to extrude and form an integral inner lining layer 01, and punch out a circular outline and a rectangular outline on the stainless steel plate according to the actual processing size, then perform multiple and progressive stamping deformation and punching operations on the circular outline of the cut stainless steel plate to punch out the shapes of the upper cover 022 and the lower cover 023, and perform roller deformation on the rectangular outline of the cut stainless steel plate to pre-form the shape of the sleeve 021, and then weld its interface parts, clean the solder after welding, and polish it for use; Step 2: Coaxially sleeve the first limiting ring 024 at both ends of the outer side of the sleeve 021, coaxially sleeve the second limiting ring 025 on the outer side of the upper cover 022 and the lower cover 023 close to the sleeve 021, coaxially sleeve the third limiting ring 026 on the inner top of the sleeve 021, weld and combine the above sleeve joints using welding equipment, clean the solder after welding, and prepare a combined clamp 05 that matches the combination of the first limiting ring 024 and the second limiting ring 025, and a clamp 06 that matches the combination of the third limiting ring 026 and the fourth limiting ring 027; Step 3: Use welding equipment to weld the weld seam on the outer side of the upper cover 022 and the sleeve 021. Before welding, use the clamping ring 06 to fix it on the inner side of the combination of the third limiting ring 026 and the fourth limiting ring 027. Then put the combination of the upper cover 022 and the sleeve 021 on the welding area of ​​the welding equipment. Use a welding gun to weld the connection between the first limiting ring 024 and the second limiting ring 025. After welding, clean the solder and then remove it for installation. Step 4: Wind the reinforcement layer 04 around the outer side of the inner lining layer 01, and then insert the two mounting ends 03 into the two second openings of the upper cover 022 and the lower cover 023 respectively, insert the inner lining layer 01 with the reinforcement layer 04 into the combination of the upper cover 022 and the sleeve 021, and then dock the lower cover 023 at its bottom; Step 5: Clamp the combined clamp 05 on the outer side of the connection between the two first limiting rings 024 and the second limiting rings 025, and sleeve the rubber gasket on the inner side of the combined clamp 05. On the support seat 051 between the two combined clamps 05, insert the protective rod 07 in the two through holes in a vertically opposite manner, and tighten it with the mounting nuts 08 at both ends, so that the protective rod 07 can tightly combine the sleeve 021, the upper cover 022 and the lower cover 023 structure; Step 6: Welding ear plates 011 in a circular array at the bottom of the lower cover 023 to install support legs and support the LNG storage tank; Step 7: Use the cable member 010 to weave diagonally between the multiple short shaft buckles 09 to form a protective net structure, and use the protective net to contact and tighten with the upper cover 022 or the lower cover 023 to enhance the structural strength and external protection.

[0023] As a specific implementation structure of the combined clamp 05 in the present invention: The combined clamp 05 is composed of two symmetrically distributed semi-ring clamps 052. A groove matching the contours of the first limiting ring 024 and the second limiting ring 025 is provided on the inner side of the semi-ring clamps 052. Circular holes are penetrated on both sides of the two semi-ring clamps 052. The first bolts 053 are connected to the corresponding two circular holes. After installation, the outer shell layer 02 forms an integral wrapping layer structure. Further, in the above technical solution, the number of support seats 051 on each half-ring clamp plate 052 is set to five, the number of ear plates 011 is set to four, the number of cable members 010 inserted from the short shaft ring buckle 09 is five, and the protective net does not contact the ear plates 011. For details, refer to the attached Figure 6-10 shown.

[0024] The welding equipment for manufacturing LNG storage tanks is used for welding in step 2 and step 3 of the manufacturing method of LNG storage tanks as mentioned above, and includes a welding chassis 1 and a gantry 2, the welding chassis 1 and the gantry 2 are fixedly assembled by screws, and both sides of the top of the welding chassis 1 are fixedly connected with parallel first slide rails 3, and a trolley 4 is movably connected between the tops of the two first slide rails 3, and a hydraulic hoist 5 is installed on the top of the trolley 4. At least two frame groove plates 6 are installed on the top placement platform of the hydraulic hoist 5, and a supporting and driving mechanism 7 is provided on the inner side of the frame groove plate 6, which is used to lift the parts to be welded and drive them to realize self-rotation, and the welding point of the welding gun corresponds to a fulcrum of the weld, and then the self-rotation of the parts to be welded can be used to realize uniform and full coverage welding at the weld; A support plate 9 fixedly connected to the platen 4 is provided on one side of the hydraulic lift 5, and a control box 10 is installed on one side of the top of the welding chassis 1. The control box 10 is electrically connected to the electrical components and is used to control the operation of the equipment. A straightening mechanism 11 is provided on the opposite side of the control box 10 and the support plate 9. The straightening mechanisms 11 on both sides are respectively supported on the inner and outer sides of the parts to be welded, and are used to accurately dock and horizontally straighten the parts to be welded, ensure that the welding points move evenly along the weld trajectory, and improve the welding quality. A height adjustment mechanism 12 is provided between the straightening mechanism 11 and the control box 10 or the support plate 9, and is used to adjust the height of the straightening mechanisms 11 on both sides, so that the axis of the straightening mechanism 11 is in line with the axis of the parts to be welded, which is convenient for producing LNG storage tanks of different diameters and improves the applicability of the equipment; A second slide rail 13 is provided on the top of the gantry 2, and a crossbeam 14 is movably connected to the second slide rail 13. A positioning mechanism 15 is installed on one side of the crossbeam 14. A welding gun body 8 is installed on the front of the positioning mechanism 15. The positioning mechanism 15 is used to adjust the lateral position, longitudinal height and welding angle of the welding gun body 8. A welding system is provided at the connecting end of the welding gun body 8. The cooperation mode of the welding system and the welding gun body 8 adopts the conventional operation of the existing welding machine.

[0025] As a specific implementation structure of the supporting and driving mechanism 7 in the present invention: The supporting and driving mechanism 7 includes two adjusting seats 71 slidably connected in each frame slot plate 6. The two adjusting seats 71 in the same frame slot plate 6 are symmetrically distributed. The inner side of the end of the adjusting seat 71 is rotatably connected with a roller 72. The outer wall of the adjusting seat 71 is fixedly connected with a first driving motor 73 at the axial position corresponding to the roller 72. The output shafts of the plurality of first driving motors 73 are respectively connected to the plurality of rollers 72 in the same direction. A Teflon layer is provided on the outer side of the roller 72, and a frosted layer is provided on the surface of the Teflon layer to increase the friction between the roller 72 and the component to be welded. Under the same direction drive, the component to be welded rotates in the torsion direction of the roller 72. A bidirectional screw rod 74 is rotatably connected to the top of the frame slot plate 6. The bidirectional screw rod 74 passes through the two adjustment seats 71 and is threadedly connected to the through hole. A torsion disk is provided on one side end of the bidirectional screw rod 74. The torsion disk is rotated to rotate the bidirectional screw rod 74, so that the two adjustment seats 71 on both sides change their relative positions and the distance between the two rollers 72 is changed, so that it is suitable for use with parts to be welded of different diameters and the stability of the parts to be welded is improved when they are placed.

[0026] As a specific implementation structure of the straightening mechanism 11 in the present invention: The alignment mechanism 11 includes a three-jaw chuck 111, an L-shaped frame plate 112 is fixedly connected to the output block of the three-jaw chuck 111 by screws, a card slot 113 is provided at the end of the L-shaped frame plate 112, an L-shaped extension plate 114 is slidably connected in the card slot 113, a plurality of evenly distributed first axial holes 115 are opened on the surface of the L-shaped extension plate 114, a second axial hole is opened at the end of the L-shaped frame plate 112, the second axial hole is coaxially connected to one of the first axial holes 115 and is installed and limited by a second bolt 116, according to the part to be welded According to the inner and outer diameter dimensions of the parts, the extension lengths of the L-shaped extension plates 114 of the squaring mechanisms 11 on both sides are adjusted respectively, and after limiting the position with the second bolts 116, the parts to be welded are installed between the squaring mechanisms 11 on both sides, and the L-shaped extension plates 114 on both sides and the fitting plates on their outer sides are respectively located on the inner and outer sides of the parts to be welded. When squaring and accurately docking are performed, the output block is made to expand outward or contract inward with the L-shaped extension plate 114 by adjusting the rotating rod of the three-jaw chuck 111 until multiple parts to be welded are accurately docked.

[0027] Furthermore, in the above technical solution, a bonding plate is detachably installed on the L-shaped extension plate 114, and the bonding plates on both sides respectively match the inner and outer side walls of the parts to be welded, so that the parts to be welded can be better docked, and after they are restrained and limited, there will be no displacement or vibration between the parts to be welded, thereby reducing the error caused by gravity or vibration during the welding process.

[0028] As a specific implementation structure of the height adjustment mechanism 12 in the present invention: The height adjustment mechanism 12 includes a fixed plate 122 on which a third slide rail 121 is installed. The fixed plate 122 is installed on the control chassis 10 or the support plate 9. A second drive motor 123 is fixedly connected to the top of the fixed plate 122. The output end of the second drive motor 123 is connected to a threaded rod 124 for transmission. An adjusting block 125 is threadedly sleeved on the outer side of the threaded rod 124. A lifting plate 126 is installed on the side of the adjusting block 125. The three-jaw chuck 111 is installed on the lifting plate 126. When it is necessary to adjust the height of the aligning mechanism 11 on both sides, the second drive motor 123 is controlled to work according to actual needs so that its output end transmits the threaded rod 124. The adjusting block 125 itself is restricted by fitting and can only move in the vertical direction. Under the traction of the threaded rod 124, the adjusting block 125 is lifted and lowered with the lifting plate 126, so that the position height of the aligning mechanism 11 changes, and the three-jaw chucks 111 on both sides are adjusted to the same height, that is, they are coaxially distributed, so as to facilitate the docking and limiting of the straight cylindrical parts to be welded.

[0029] As a specific implementation structure of the positioning mechanism 15 in the present invention: The positioning mechanism 15 includes a longitudinal mounting beam plate 151, a fourth slide rail 152 is fixedly connected to the front of the cross beam 14, the longitudinal mounting beam plate 151 is slidably connected to the fourth slide rail 152, a fifth slide rail 153 is fixedly connected to the front of the longitudinal mounting beam plate 151, a welding mechanism mounting plate 154 is slidably connected to the fifth slide rail 153, the welding gun body 8 is rotatably mounted on the welding mechanism mounting plate 154, a driving motor is fixedly mounted on the welding mechanism mounting plate 154, the driving motor output shaft drives the welding gun body 8 and swings it to adjust the inclination angle, the driving motor cooperates with the welding gun body 8 to swing and adjust the inclination angle of the welding gun body 8, which can not only achieve better fit and facilitate contact with the welding point position of the weld, but also reciprocate and periodically swing during welding, which can achieve the effect of fish scale welding and improve the connection strength of the structure after welding.

[0030] Furthermore, in the above technical solution, hydraulic cylinders are provided between the platen 4 and the welding chassis 1, between the crossbeam 14 and the gantry 2, between the longitudinal mounting beam plate 151 and the crossbeam 14, and between the welding mechanism mounting plate 154 and the longitudinal mounting beam plate 151, and the output ends of the plurality of hydraulic cylinders respectively drive the platen 4, the crossbeam 14, the longitudinal mounting beam plate 151 and the welding mechanism mounting plate 154 to move; The connecting end of the hydraulic cylinder is provided with a hydraulic mechanism for providing kinetic energy, and the hydraulic mechanism is electrically connected to the control box 10 .

[0031] The welding equipment provided by the present invention is used for processing the welded parts to produce LNG storage tanks: Place two or more parts to be welded on the support and drive mechanism 7 at the top of the hydraulic lift 5, adjust the height of the hydraulic lift 5 and the position of the trolley 4, use the height adjustment mechanism 12 to change the position height of the straightening mechanism 11, and adjust the three-jaw chucks 111 on both sides to the same height, that is, to make them coaxially distributed, so as to facilitate the butt-jointing and positioning of the straight cylindrical parts to be welded; According to the inner and outer diameters of the parts to be welded, the extension lengths of the L-shaped extension plates 114 of the aligning mechanisms 11 on both sides are adjusted respectively, and after being limited by the second bolts 116, the parts to be welded are installed between the aligning mechanisms 11 on both sides, so that the aligning mechanisms 11 on both sides can clamp the two sides of the parts to be welded, and the L-shaped extension plates 114 on both sides and the bonding plates on the outside thereof are respectively located on the inside and outside of the parts to be welded. When aligning and accurately docking, the output block is made to expand outward or contract inward with the L-shaped extension plates 114 by adjusting the rotating rod of the three-jaw chuck 111 until a plurality of parts to be welded are accurately docked, so that the parts to be welded are horizontally aligned, and no displacement or vibration occurs between the parts to be welded, thereby reducing the error caused by gravity or vibration during welding, and greatly improving the welding stability; During welding, the positioning mechanism 15 is used to make the welding point of the welding gun body 8 correspond to a fulcrum of the weld, and multiple rollers 72 are used to hold up the parts to be welded. When multiple driving motors are driven in the same direction, the parts to be welded are rotated in the torsion direction of the rollers 72 to achieve self-rotation, so that uniform and full coverage welding can be achieved at the weld, ensuring that the welding point moves evenly along the weld trajectory, improving the welding quality, and coordinating with the welding gun body 8 to swing and adjust the inclination angle of the welding gun body 8 during welding, not only can better fit be achieved, but also convenient contact with the welding point position of the weld, and further reciprocating and periodic swings occur during welding, which can achieve the effect of fish scale welding and improve the connection strength of the structure after welding.

[0032] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an LNG storage tank, for preparing an LNG storage tank, wherein the manufactured LNG storage tank comprises an inner lining layer (01) and an outer shell layer (02), wherein the outer shell layer (02) is coaxially sleeved on the outer side of the inner lining layer (01), wherein both ends of the inner lining layer (01) are provided with a trumpet-shaped first opening at the axial center position, and both ends of the outer shell layer (02) are provided with a straight-cylindrical second opening at the axial center position, and a mounting end (03) is provided between the corresponding first opening and the second opening, wherein the mounting end (03) is provided with a threaded hole at the axial center for connecting to a gas transmission pipeline, and a rubber gasket is provided on the outer side of the mounting end (03), and a reinforcement layer (04) is provided between the outer wall of the inner lining layer (01) and the inner wall of the outer shell layer (02), wherein: The outer shell layer (02) comprises a sleeve (021) and an arched upper cover (022) and a lower cover (023), wherein the upper cover (022) and the lower cover (023) are respectively arranged at the top and the bottom of the sleeve (021), the upper cover (022) and the sleeve (021) are welded and fixed, and the lower cover (023) and the sleeve (021) are detachably installed, first limiting rings (024) are welded to the outer sides of both ends of the sleeve (021), second limiting rings (025) are welded to the outer sides of the ends of the upper cover (022) and the lower cover (023) close to the sleeve (021), and the corresponding first limiting rings (024) and the second limiting rings (025) are connected via a combined clamp (05), the inner top end of the sleeve (021) is fixedly connected to a third limiting ring (026), and the inner bottom end of the upper cover (022) is fixedly connected to a third limiting ring (026). A fourth limiting ring (027) is fixedly connected, and the corresponding third limiting ring (026) and the fourth limiting ring (027) are bound by a clamping ring (06); the outer side of the combined clamping hoop (05) is integrally provided with evenly distributed support seats (051), and the surface of the support seats (051) is provided with through holes, and a protective rod (07) is inserted into two through holes on the vertically opposite support seats (051), and threaded sections are provided at both ends of the outer side of the protective rod (07), and the outer side of the threaded section of the protective rod (07) is threadedly connected with a mounting nut (08), and short shaft buckles (09) are rotatably connected at the axis of the two ends of the protective rod (07), and cable parts (010) are inserted diagonally between the plurality of short shaft buckles (09), and the braided structure of the cable parts (010) is in contact with the upper cover (022) or the lower cover (023); The specific manufacturing process of LNG storage tanks is as follows: Step 1: Prepare and pre-process parts, use aluminum alloy plate to extrude and form an integral lining layer (01), and punch out a circular contour and a rectangular contour on the stainless steel plate according to the actual processing size, then perform multiple and progressive stamping deformation and punching operations on the circular contour of the cut stainless steel plate to punch out the shapes of the upper cover (022) and the lower cover (023), and perform roller deformation on the rectangular contour of the cut stainless steel plate to pre-form the shape of the sleeve (021), and then weld the interface parts, clean the solder after welding, and polish it for use; Step 2: coaxially sleeve the first limiting ring (024) at both ends of the outer side of the sleeve (021), coaxially sleeve the second limiting ring (025) at the outer side of one end of the upper cover (022) and the lower cover (023) close to the sleeve (021), and coaxially sleeve the third limiting ring (026) at the top of the inner side of the sleeve (021), and weld the above-mentioned sleeve joints together using welding equipment, clean the solder after welding, and prepare a combined clamp (05) that matches the combination of the first limiting ring (024) and the second limiting ring (025), and a clamp (06) that matches the combination of the third limiting ring (026) and the fourth limiting ring (027); Step 3: Use welding equipment to weld the weld seam on the outside of the upper cover (022) and the sleeve (021), and before welding, use a clamping ring (06) to fix it on the inside of the combination of the third limiting ring (026) and the fourth limiting ring (027), then put the combination of the upper cover (022) and the sleeve (021) on the welding area of ​​the welding equipment, use a welding gun to weld the connection between the first limiting ring (024) and the second limiting ring (025), clean the solder after welding, and then remove it for installation; Step 4: Winding a reinforcement layer (04) around the outer side of the inner lining layer (01), and then inserting the two mounting ends (03) into the two second openings of the upper cover (022) and the lower cover (023) respectively, inserting the inner lining layer (01) provided with the reinforcement layer (04) into the combination of the upper cover (022) and the sleeve (021), and then docking the lower cover (023) at its bottom; Step 5: The combined clamps (05) are respectively clamped on the outer sides of the connection points between the two first limiting rings (024) and the second limiting rings (025), and the rubber gaskets are sleeved on the inner sides of the combined clamps (05). On the support seat (051) between the two combined clamps (05), the protection rod (07) is inserted into the two through holes in a vertically opposite manner, and the mounting nuts (08) at both ends are tightened, so that the protection rod (07) is tightly combined with the sleeve (021), the upper cover (022) and the lower cover (023) structure; Step 6: Welding ear plates (011) in a circular array at the bottom of the lower cover (023) to install support legs and support the LNG storage tank; Step 7: Use the cable member (010) to weave diagonally between the plurality of short shaft buckles (09) to form a protective net structure, and use the protective net to contact and tighten with the upper cover (022) or the lower cover (023) to enhance the structural strength and external protection.

2. The method for manufacturing an LNG storage tank according to claim 1, characterized in that: The combined clamp (05) is composed of two symmetrically distributed semi-ring clamps (052), and a groove matching the contours of the first limiting ring (024) and the second limiting ring (025) is provided on the inner side of the semi-ring clamps (052). Circular holes are penetrated on both sides of the two semi-ring clamps (052), and the first bolts (053) are commonly connected in the corresponding two circular holes.

3. The method for manufacturing an LNG storage tank according to claim 2, characterized in that: The number of support seats (051) on each of the semi-ring clamping plates (052) is set to five, and the number of ear plates (011) is set to four, the number interval of the cable member (010) when it is inserted through the short shaft buckle (09) is five, and the protective net does not contact the ear plates (011).

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