Large low-temperature liquefied natural gas storage tank dome mounting device and method

Abstract

The invention provides a large low-temperature liquefied natural gas storage tank dome mounting device and method. The mounting device comprises a hoisting annular slide way assembly, an outer tooth rotating bearing, an inner and outer sliding direction track assembly, an annular slide way, a hoisting electric hoist and a splicing electric hoist. The outer tooth rotating bearing is installed above the storage tank, the inner and outer sliding direction rail assembly is connected with an outer bearing of the outer tooth rotating bearing, and the bottom of an inner bearing of the outer tooth rotating bearing is connected with the hoisting electric hoist. The hoisting annular slide way assembly is annularly arranged outside the outer tooth rotating bearing, the rotating motor provides power for rotation of the outer tooth rotating bearing, an outer bearing body of the outer tooth rotating bearing rotates around the axis of the outer bearing body, and the inner and outer sliding direction track assembly is arranged to move between the outer tooth rotating bearing and the hoisting annular slide way assembly in a reciprocating mode. The high-altitude splicing device can solve the problem of difficulty in high-altitude splicing of a large-mass dome part and the problem of splicing accuracy.

Description

Technical Field

[0001] The invention belongs to the field of liquefied gas storage, and in particular relates to a dome installation device and method for a large-scale cryogenic liquefied natural gas storage tank. Background Art

[0002] The dome of a liquefied natural gas tank is an important part of the tank structure, and its design must meet the special requirements of low temperature environment, air tightness, high strength and service life. Therefore, the splicing and installation of a large dome is one of the biggest difficulties in the assembly of natural gas tanks.

[0003] Due to the large size of the dome, it is usually manufactured in sections and then assembled on site. However, since the dome can reach a diameter of tens of meters and weigh hundreds of tons, it is difficult to accurately control the position and angle of the hoisting. At the same time, high-altitude operations are affected by the wind load environment, and the safety factor is difficult to guarantee. During the actual installation, multiple cranes work together, which increases the difficulty of installation and accuracy.

[0004] The pre-installation tools and methods available on the market divide the dome vertically into multiple pieces, and then weld them together for high-altitude ceiling installation. However, each spliced ​​part is heavy and long, making it difficult to install and operate. In addition, the stress and deformation of adjacent spliced ​​parts are likely to be the same, which makes the problem of superimposed stress in the assembled dome more prominent, ultimately causing problems such as dome deformation and unsealed storage tanks. Summary of the invention

[0005] In view of this, the present invention aims to provide a large-scale cryogenic liquefied natural gas storage tank dome installation device and method to solve at least one of the above problems.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0007] A large-scale cryogenic liquefied natural gas storage tank dome installation device, which includes a hoisting annular slideway assembly, an external gear rotary bearing, an inner and outer sliding track assembly, an annular slideway, a hoisting electric hoist and a splicing electric hoist;

[0008] The external gear rotary bearing is installed above the storage tank, the inner and outer sliding track assembly is connected to the outer bearing of the external gear rotary bearing, and the bottom of the inner bearing of the external gear rotary bearing is connected to the hoisting electric hoist;

[0009] The hoisting annular slideway assembly is arranged outside the external gear rotary bearing, the rotating motor provides power for the rotation of the external gear rotary bearing, the outer bearing of the external gear rotary bearing rotates around its axis, and the inner and outer sliding track assembly is arranged as a track for reciprocating movement between the external gear rotary bearing and the hoisting annular slideway assembly;

[0010] An annular slideway is installed on the inner and outer slide track assemblies, and the annular slideway is preset to be an arc track with the outer gear rotary bearing as the center;

[0011] The spliced ​​electric hoist is installed on the sliding motor and slides on the annular slideway through the sliding motor.

[0012] By coordinating the above components, dome installation in various scenarios and specifications can be completed. At the same time, it can meet the splicing and installation work of the dome parts pre-assembled into multiple small pieces, reducing the requirements for high-altitude operations.

[0013] Furthermore, the hoisting annular slide assembly includes at least two annular slides, and each annular slide is slidably connected to the inner and outer sliding track assemblies.

[0014] Setting up multiple circular slideways can ensure that the spliced ​​electric hoist is more stable during operation.

[0015] Furthermore, the inner and outer sliding track assembly includes at least two inner and outer sliding tracks, the front end of each inner and outer sliding track is connected to the outer bearing of the external gear rotating bearing; the middle and rear ends of the inner and outer sliding tracks are both slidably connected to different annular slideways.

[0016] Further, the hoisting annular slide assembly comprises a hoisting inner annular slide and a hoisting outer annular slide, and the hoisting inner annular slide is arranged between the external gear rotary bearing and the hoisting outer annular slide;

[0017] Each inner and outer sliding track includes at least two annular slideways, and at least one annular slideway is arranged between the outer gear rotary bearing and the hoisting inner annular slideway, and between the hoisting inner annular slideway and the hoisting outer annular slideway.

[0018] Setting up circular slideways at different positions can further improve the adaptability of the installation device, so that it can be installed regardless of the size of the dome. At the same time, it also increases the range of the operating trajectory of the spliced ​​electric hoist, thereby ensuring that the pre-spliced ​​dome part has enough space to avoid other existing structures during installation.

[0019] Furthermore, the external tooth rotary bearing includes an outer bearing and an inner bearing, the outer bearing is provided with a rack, the output shaft of the rotary motor is connected to the rotary gear, the rotary gear is meshed with the rack of the outer bearing, and the rotary motor provides rotational power for the external tooth rotary bearing.

[0020] The lowest-cost gear and rack matching structure is adopted to realize the rotation action with the external gear rotary bearing as the center.

[0021] Further, the inner-outer sliding track assembly comprises a plurality of inner-outer sliding tracks, a sliding rack is arranged on the inner track wall of the inner-outer sliding track, the inner-outer sliding motor is mounted on the inner-outer sliding mounting seat, the output shaft of the inner-outer sliding motor passes through the inner-outer sliding mounting seat and is connected to the sliding gear, and the sliding gear is meshed with the sliding rack;

[0022] The annular slide is installed on the inner and outer slide mounting seats. An annular slide groove is provided on the annular slide. An annular rack is installed in the annular slide groove. The guide wheel is meshed and connected with the annular rack. The guide wheel moves in the annular slide groove through the rotational power provided by the sliding motor.

[0023] The coordinated arrangement of the inner and outer sliding rails, the annular slideway and the hoisting annular slideway assembly can enable the splicing electric hoist to move in three directions to meet the requirements of pre-spliced ​​dome structures of different specifications.

[0024] Furthermore, it also includes a first connecting block and a second connecting block that are matched in pairs, wherein a first plug-in slot is provided at one side end of the first connecting block, and a second plug-in piece that is plug-matched with the first plug-in slot is installed at the corresponding side end of the second connecting block;

[0025] The first connecting block and the second connecting block are both provided with mounting threaded holes.

[0026] Furthermore, the first plug-in slot is a trapezoidal slot, the lower bottom of the trapezoidal slot is arranged on the surface of the first connecting block, and the upper bottom of the trapezoidal slot is arranged inside the first connecting block; the second connector is a trapezoidal block, and the lower bottom of the second plug-in block is located on the surface of the second connecting block.

[0027] The provision of the first connecting block and the second connecting block can make the pre-splicing process smoother and more accurate; the provision of the first plug-in slot and the second plug-in piece can also enable the motor and the operator to promptly understand whether the pre-splicing is in place, thereby meeting the accuracy and efficiency requirements of the splicing at the lowest cost.

[0028] Furthermore, the external gear rotary bearing and the hoisting annular track assembly are arranged in concentric circles.

[0029] Furthermore, a plurality of inner and outer sliding tracks are arranged with the outer gear rotary bearing as the center, and each of the inner and outer sliding tracks is provided with at least two annular slideways.

[0030] Furthermore, the hoisting inner annular slideway and the hoisting outer annular slideway are both assembled by splicing tracks.

[0031] A method for dome installation using a large cryogenic liquefied natural gas storage tank dome installation device, the specific method is as follows:

[0032] A central mounting support frame is set up at the center of the storage tank, an external gear rotary bearing is installed on the top of the central mounting support frame, and the central mounting support frame includes a hollow transport channel;

[0033] A mounting bracket is added inside and / or outside the storage tank, and the hoisting annular slideway assembly is mounted above the storage tank by the mounting bracket;

[0034] Divide the dome into a central part, a transition part and an outer edge part, and pre-join them;

[0035] The central part is lifted to high altitude by the hoisting electric hoist through the transport channel, and the transition part and the outer edge part are lifted to high altitude by other splicing electric hoists, and spliced ​​with other parts already in the air through the movable track of the splicing electric hoist until the entire dome is spliced.

[0036] The above installation method can not only meet the splicing requirements of the dome bracket, but also break the traditional idea that the original pre-assembled dome part is too heavy and it is inconvenient to re-assemble it, and reduce the performance requirements for the lifting equipment. At the same time, it is more in line with the pre-spliced ​​structure divided according to the shape of the dome structure, making the components of the assembly process more flexible. After installation, the dome is disassembled into three parts to share the stress generation points, reducing the impact of excessive stress concentration on the quality of the assembled dome.

[0037] Furthermore, a plurality of internal mounting support frames are arranged inside the storage tank, and a plurality of external mounting support frames are arranged outside the storage tank, and the internal mounting support frames can pass through the holes in the pre-joined parts of the dome;

[0038] Divide the structure distribution according to the pre-joined parts of the dome, set the position of the internal installation support frame to avoid interference when hoisting the pre-joined parts of the dome;

[0039] Each inner and outer sliding track includes at least two annular slideways, at least one annular slideway is arranged between the outer gear rotary bearing and the hoisting inner annular slideway, and between the hoisting inner annular slideway and the hoisting outer annular slideway, and at least one spliced ​​electric hoist is arranged on the annular slideway to slide with it;

[0040] Through the displacement of the splicing electric hoist on the annular slide, the transition part and the central part are first hoisted and spliced ​​and pre-welded, and then the outer edge part is hoisted to a high altitude and assembled with the pre-spliced ​​part.

[0041] It can effectively measure the influence of the installation device on the lifting trajectory of different pre-assembled parts during the splicing process, and can quickly assemble components in different parts.

[0042] Furthermore, the first connection block or the second connection block is installed on the ends of the pre-joined central part, transition part and outer edge part on the ground;

[0043] A first connection block is installed on one side of the outer end of the central part, and a second connection block is installed on the same side of the position where the transition part and the central part are spliced;

[0044] A first connection block is installed on one side of the position where the transition part and the outer edge part are spliced, and a second connection block is installed on the same side of the position where the outer edge part and the transition part are spliced;

[0045] The second plug-in connector on the second connecting block is gradually inserted into the first plug-in slot by sliding the spliced ​​electric hoist on the annular slideway;

[0046] A current sensor is provided to control the sliding motor to stop. When the second connector is completely inserted into the first connector slot, the current sensor detects the change in current value and controls the sliding motor to stop. At this time, the assembly of the two pre-joined parts is completed.

[0047] The pre-assembled splicing electric hoist is released after the pre-welding is completed, and the released splicing electric hoist continues to hoist other parts to be spliced.

[0048] The first connecting block and the second connecting block are cleverly used to allow the motor to automatically stop after the splicing is completed, thereby improving the automation level of the entire installation device and method and further ensuring the accuracy of the splicing.

[0049] Furthermore, the central part is the middle part of the dome; the transition part is the middle part of the dome, the middle part is divided into a plurality of pre-joined middle part blocks, and the projection of each middle part block is a rectangle; the outer edge part is the outer edge part of the dome, the outer edge part is divided into a plurality of pre-joined outer edge part blocks, and the projection of each outer edge part block is a trapezoid.

[0050] The dome is divided into three parts according to its external structural features, and different segmentation shapes are set when each part needs to be further segmented, so that the accuracy is improved during splicing due to the characteristics of different parts.

[0051] Furthermore, the area of ​​the central part is set to account for 10% of the total area of ​​the dome, the area of ​​the transition part is set to account for 40% of the total area of ​​the dome, and the area of ​​the outer edge part is set to account for 50% of the total area of ​​the dome;

[0052] Total dome area: A 总 =πR 2

[0053] Center area: A 中心 =10%A 总

[0054] Transition area: A 过度 =40%A 总

[0055] Outer edge area: A 外缘 =50%A 总

[0056] Calculation of the outer radius of the center ring:

[0057] Calculation of outer radius of transition ring:

[0058] The radii of the three different parts are calculated by the above formula;

[0059] Set the area of ​​each block according to different parts, and set the area of ​​the central part as a whole block;

[0060] If the radius of the transition area is less than 10 meters, each small area of ​​the transition area is set to 4-8 square meters. If the radius of the transition area is greater than 10 meters, each small area of ​​the transition area is set to 8-12 square meters.

[0061] If the radius of the outer edge is less than 15 meters, each small piece of the outer edge is set to 15-20 square meters. If the radius of the outer edge is greater than 15 meters, each small piece of the outer edge is set to 30-40 square meters.

[0062] The area is divided according to the characteristics of different parts to better meet the characteristic requirements of dome parts with different curvatures.

[0063] Compared with the prior art, the large-scale cryogenic liquefied natural gas storage tank dome installation device and method created by the present invention has the following advantages:

[0064] The dome installation device can meet the installation requirements of domes of different large specifications, and can also adapt to the installation environment requirements of above-ground or underground storage tanks; the installation device of the present invention can be used regardless of being above-ground or underground.

[0065] The installation method of the dome divides the dome into three parts according to its shape, and stipulates and requires the division of each part, which reduces the weight of the dome part each time it is hoisted to high altitude. At the same time, combined with the installation device, the efficiency and accuracy of high-altitude splicing are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0067] Figure 1 A schematic diagram of the regional division of a large cryogenic liquefied natural gas storage tank dome according to an embodiment of the present invention;

[0068] Figure 2A schematic diagram of the coordination between a large-scale cryogenic liquefied natural gas storage tank dome installation device and the storage tank position according to an embodiment of the present invention;

[0069] Figure 3 A schematic top view of a dome installation device for a large cryogenic liquefied natural gas storage tank according to an embodiment of the present invention;

[0070] Figure 4 A schematic diagram of the cooperation between the external gear rotary bearing and the rotary motor according to an embodiment of the present invention;

[0071] Figure 5 A schematic diagram of the coordinated installation of the inner and outer sliding track components and the annular slideway according to an embodiment of the present invention;

[0072] Figure 6 A schematic structural diagram of the first connecting block and the second connecting block described in an embodiment of the present invention.

[0073] Description of reference numerals:

[0074] 1. Dome; 2. Rectangular dome area; 3. Trapezoidal dome area; 4. Central dome area; 51. External mounting support frame; 52. Internal mounting support frame; 53. Central mounting support frame; 6. Hoisting annular slide assembly; 61. Hoisting inner annular slide; 62. Hoisting outer annular slide; 7. External gear rotary bearing; 71. Bearing outer gear; 8. Internal and external sliding track assembly; 81. Internal and external sliding track; 82. Internal and external sliding mounting seat; 83. Internal and external sliding motor; 9. Annular slide; 91. Annular slide groove; 10. Rotating motor; 101. Rotating gear; 11. First connecting block; 111. First plug-in slot; 12. Second connecting block; 121. Second plug-in piece; 13. Tank wall. DETAILED DESCRIPTION

[0075] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0076] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0077] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0078] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0079] A large-scale cryogenic liquefied natural gas storage tank dome 1 installation device, which includes a hoisting annular slideway assembly 6, an external gear rotary bearing 7, an inner and outer sliding track 81 assembly 8, an annular slideway 9, a hoisting electric hoist and a splicing electric hoist;

[0080] The external gear rotary bearing 7 is installed above the storage tank, the inner and outer sliding rail 81 assembly 8 is connected to the outer bearing of the external gear rotary bearing 7, and the bottom of the inner bearing of the external gear rotary bearing 7 is connected to the hoisting electric hoist;

[0081] The hoisting annular slideway assembly 6 is arranged outside the external gear rotary bearing 7, the rotating motor 10 provides power for the rotation of the external gear rotary bearing 7, the outer bearing of the external gear rotary bearing 7 rotates around its axis, and the inner and outer sliding track 81 assembly 8 is set as a track for reciprocating movement between the external gear rotary bearing 7 and the hoisting annular slideway assembly 6;

[0082] The hoisting annular slide assembly 6 includes at least two annular slides, each of which is slidably connected to the inner and outer sliding rail 81 assembly 8.

[0083] Furthermore, the hoisting annular slide assembly 6 includes an inner hoisting annular slide 61 and an outer hoisting annular slide 62, and the inner hoisting annular slide 61 is arranged between the external gear rotary bearing 7 and the outer hoisting annular slide 62; and the number of the inner hoisting annular slides 61 and the number of the outer hoisting annular slides 62 can be determined according to the number of dome blocks that need to be spliced; if the number of electric hoists that need to be spliced ​​is large, more structural hoisting annular slides are set.

[0084] Each inner and outer sliding track 81 includes at least two annular slideways 9, and at least one annular slideway 9 is arranged between the outer gear rotary bearing 7 and the hoisting inner annular slideway 61, and between the hoisting inner annular slideway 61 and the hoisting outer annular slideway 62. It is ensured that each spliced ​​electric hoist is installed on an annular slideway 9.

[0085] An annular slideway 9 is installed on the inner and outer slide rail 81 assembly 8, and the annular slideway 9 is preset to be an arc track with the outer gear rotary bearing 7 as the center;

[0086] The spliced ​​electric hoist is installed on the sliding motor and slides on the annular slideway 9 through the sliding motor.

[0087] By coordinating and setting the above components, the installation of the dome 1 in various scenes and specifications can be completed, and at the same time, the splicing and installation work of the dome 1 parts pre-assembled into multiple small pieces can be met, reducing the requirements for high-altitude operations.

[0088] The inner and outer sliding rail 81 assembly 8 includes at least two inner and outer sliding rails 81, and the front end of each inner and outer sliding rail 81 is connected to the outer bearing of the external gear rotary bearing 7; the middle and rear ends of the inner and outer sliding rails 81 are slidably connected to different annular slideways.

[0089] The inner and outer sliding rail 81 assembly 8 comprises a plurality of inner and outer sliding rails 81, a sliding rack is arranged on the inner rail wall of the inner and outer sliding rail 81, an inner and outer sliding motor 83 is mounted on an inner and outer sliding mounting seat 82, an output shaft of the inner and outer sliding motor 83 passes through the inner and outer sliding mounting seat 82 and is connected to a sliding gear, and the sliding gear is meshed with the sliding rack;

[0090] The annular slide 9 is installed on the inner and outer slide mounting seats 82. An annular slide groove 91 is opened on the annular slide 9. An annular rack is installed in the annular slide groove 91. The guide wheel is meshed and connected with the annular rack. The guide wheel moves in the annular slide groove 91 through the rotational power provided by the sliding motor.

[0091] The coordinated arrangement of the inner and outer slide rails 81, the annular slideway 9 and the hoisting annular slideway assembly 6 can enable the splicing electric hoist to move in three directions, meeting the requirements of pre-spliced ​​dome 1 structures of different specifications.

[0092] The external tooth rotary bearing 7 includes an outer bearing and an inner bearing, the outer bearing is provided with a rack, the output shaft of the rotary motor 10 is connected to the rotary gear 101, the rotary gear 101 is meshed with the rack of the outer bearing, and the rotary motor 10 provides rotational power for the external tooth rotary bearing 7.

[0093] The first connecting block 11 and the second connecting block 12 are matched in pairs. The first connecting block 11 has a first plug-in slot 111 at one side end, and the second connecting block 12 has a second plug-in connector 121 that is plug-matched with the first plug-in slot 111 installed at the corresponding side end.

[0094] The first connecting block 11 and the second connecting block 12 are both provided with mounting threaded holes.

[0095] The first plug-in slot 111 is a trapezoidal slot, the lower bottom of which is arranged on the surface of the first connecting block 11, and the upper bottom of which is arranged inside the first connecting block 11; the second connector 121 is a trapezoidal block, and the lower bottom of the second plug-in block is located on the surface of the second connecting block 12.

[0096] The arrangement of the first connecting block 11 and the second connecting block 12 can make the pre-splicing process smoother and more accurate; the arrangement of the first plug-in slot 111 and the second plug-in piece 121 can also enable the motor and the operator to promptly understand whether the pre-splicing is in place, thereby meeting the accuracy and efficiency requirements of the splicing at the lowest cost.

[0097] The external gear rotary bearing 7 and the hoisting annular track assembly are arranged in concentric circles.

[0098] A plurality of inner and outer sliding tracks 81 are arranged with the external gear rotary bearing 7 as the center, and each inner and outer sliding track 81 is provided with at least two annular slideways 9 .

[0099] The hoisting inner annular slideway 61 and the hoisting outer annular slideway 62 are both assembled by splicing tracks.

[0100] The spliced ​​rails can meet the requirements of fast loading and unloading, and can be reused in the dome 1 installation of other tanks.

[0101] The method for installing the dome 1 using the large cryogenic liquefied natural gas storage tank dome 1 installation device is as follows:

[0102] A central mounting support frame 53 is set up at the center of the storage tank, an external gear rotary bearing 7 is installed on the top of the central mounting support frame 53, and the central mounting support frame 53 includes a hollow transport channel;

[0103] A mounting bracket is added inside and / or outside the storage tank, and the hoisting annular slideway assembly 6 is mounted above the storage tank by the mounting bracket; the one installed inside the storage tank is the internal mounting support frame 52, and the one installed outside the storage tank is the external mounting support frame 51. A plurality of internal mounting support frames 52 are arranged inside the storage tank, and a plurality of external mounting support frames 51 are arranged outside the storage tank, and the internal mounting support frames 52 can pass through the holes in the pre-joined parts of the dome 1;

[0104] According to the structural distribution of the pre-joined parts of the dome 1, the position of the internal mounting support frame 52 is set to avoid interference when hoisting the pre-joined parts of the dome 1.

[0105] like Figure 1 As shown, the dome 1 is divided into a central part, a transition part and an outer edge part, and pre-assembled; that is, the central part can be a whole pre-assembled component, while the transition part and the outer edge part need to be further divided into a plurality of blocks and pre-assembled, that is, each block is assembled with horizontal rods and vertical rods. This part of the work is completed on the ground, that is, the pre-assembled parts are formed, waiting for the final assembly to be completed in the air.

[0106] The central part is lifted to high altitude by the hoisting electric hoist through the transport channel. At this time, the hoisting electric hoist stops moving and continues to provide lifting force to the central part to ensure the subsequent assembly of other parts.

[0107] The transition part and the outer edge part are lifted to high altitude by other splicing electric hoists, and spliced ​​with other parts already in high altitude through the movable track of the splicing electric hoist until the whole dome 1 is spliced.

[0108] Since there is interference from the installation support frame when lifting the transition part and the outer edge part, it is necessary to avoid it through the moving trajectory of the electric hoist, and the splicing with the central part is connected through the bracket holes around the transport channel;

[0109] Each inner and outer sliding track 81 includes at least two annular slideways 9, at least one annular slideway 9 is arranged between the external gear rotary bearing 7 and the hoisting inner annular slideway 61, and between the hoisting inner annular slideway 61 and the hoisting outer annular slideway 62, and at least one spliced ​​electric hoist is arranged on the annular slideway 9 to slide with it;

[0110] Through the displacement of the splicing electric hoist on the annular slideway 9, the transition part and the central part are first hoisted and spliced ​​and pre-welded, and then the outer edge part is hoisted to high altitude and assembled with the pre-spliced ​​part. Finally, detailed welding work is performed to ensure that all domes 1 are accurately spliced ​​and there are no leftover points.

[0111] In order to improve the efficiency and accuracy of high-altitude splicing:

[0112] Install the first connection block 11 or the second connection block 12 on the ends of the pre-joined central part, transition part and outer edge part on the ground;

[0113] A first connection block 11 is installed on one side of the outer end of the central part, and a second connection block 12 is installed on the same side of the position where the transition part and the central part are spliced;

[0114] A first connection block 11 is installed on one side of the position where the transition part and the outer edge part are spliced, and a second connection block 12 is installed on the same side of the position where the outer edge part and the transition part are spliced;

[0115] The second plug-in connector 121 on the second connecting block 12 is gradually inserted into the first plug-in slot 111 by sliding the spliced ​​electric hoist on the annular slideway 9;

[0116] A current sensor is provided to control the sliding motor to stop. When the second connector 121 completely enters the first connector slot 111, the current sensor detects the change in current value and controls the sliding motor to stop. At this time, the assembly of the two pre-joined parts is completed.

[0117] The pre-assembled splicing electric hoist is released after the pre-welding is completed, and the released splicing electric hoist continues to hoist other parts to be spliced.

[0118] The first connecting block 11 and the second connecting block 12 are cleverly used to allow the motor to automatically stop after the splicing is completed, thereby improving the automation level of the entire installation device and method and further ensuring the accuracy of the splicing.

[0119] The central part is the middle part of the dome 1; the transition part is the middle part of the dome 1, which is divided into a plurality of pre-joined middle part blocks, and the projection of each middle part block is a rectangle; the outer edge part is the outer edge part of the dome 1, which is divided into a plurality of pre-joined outer edge part blocks, and the projection of each outer edge part block is a trapezoid.

[0120] Central part: from the center point to a certain radius r 2 , which is usually the part with the least curvature of the dome.

[0121] Transition part: from r 2 to r 3 , which is the middle transition area, has moderate curvature, and the block shape is usually a long strip.

[0122] Outer edge: from r 3 To R, the outer area of ​​the dome, the block shape is trapezoidal.

[0123] The dome is divided into three parts according to its external structural features, and different segmentation shapes are set when each part needs to be further segmented, so that the accuracy is improved during splicing due to the characteristics of different parts.

[0124] Furthermore, the area of ​​the central part is set to account for 10% of the total area of ​​the dome, the area of ​​the transition part is set to account for 40% of the total area of ​​the dome, and the area of ​​the outer edge part is set to account for 50% of the total area of ​​the dome;

[0125] Total dome area: A 总 =πR 2

[0126] Center area: A 中心 =10%A 总

[0127] Transition area: A 过度 =40%A 总

[0128] Outer edge area: A 外缘 =50%A 总

[0129] Calculation of the outer radius of the center ring:

[0130] Calculation of outer radius of transition ring:

[0131] The radii of the three different parts are calculated by the above formula;

[0132] Set the area of ​​each block according to different parts, and set the area of ​​the central part as a whole block;

[0133] If the radius of the transition area is less than 10 meters, each small area of ​​the transition area is set to 4-8 square meters. If the radius of the transition area is greater than 10 meters, each small area of ​​the transition area is set to 8-12 square meters.

[0134] If the radius of the outer edge is less than 15 meters, each small piece of the outer edge is set to 15-20 square meters. If the radius of the outer edge is greater than 15 meters, each small piece of the outer edge is set to 30-40 square meters.

[0135] For details, please refer to one of the examples for calculation:

[0136] For example, the dome diameter D = 30m, R = 15m;

[0137] Total dome area: A 总 =πR 2 =π*15 2 =706.86m 2

[0138] Center area: A 中心 =10%A 总 =70.69m 2

[0139] Transition area: A 过度 =40%A 总 =282.74m 2

[0140] Outer edge area: A 外缘 =50%A 总 =353.43m 2

[0141]

[0142]

[0143] Center: r 1 = 0m to r 2 =4.74m;

[0144] Transition area: r 2 =4.74m to r 3 =9.49m;

[0145] Outer edge: r 3 =9.49m to R=15m

[0146] The area of ​​the center is 1 block;

[0147] The area of ​​the transition part is

[0148]

[0149] The area of ​​the outer edge is

[0150]

[0151] In this way, the number of blocks that each divided part needs to be divided into and the number of blocks that need to be spliced ​​can be calculated, and the number of electric hoists can be set based on this number to meet the needs of high-altitude splicing.

[0152] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-scale cryogenic liquefied natural gas storage tank dome installation device, characterized in that: It includes a hoisting annular slideway assembly, an external gear rotary bearing, an inner and outer sliding track assembly, an annular slideway, a hoisting electric hoist and a spliced ​​electric hoist; The external gear rotary bearing is installed above the storage tank, the inner and outer sliding track assembly is connected to the outer bearing of the external gear rotary bearing, and the bottom of the inner bearing of the external gear rotary bearing is connected to the hoisting electric hoist; The hoisting annular slideway assembly is arranged outside the external gear rotary bearing, the rotating motor provides power for the rotation of the external gear rotary bearing, the outer bearing of the external gear rotary bearing rotates around its axis, and the inner and outer sliding track assembly is arranged as a track for reciprocating movement between the external gear rotary bearing and the hoisting annular slideway assembly; An annular slideway is installed on the inner and outer slide track assemblies, and the annular slideway is preset to be an arc track with the outer gear rotary bearing as the center; The spliced ​​electric hoist is installed on the sliding motor and slides on the annular slideway through the sliding motor.

2. A large-scale cryogenic liquefied natural gas storage tank dome installation device according to claim 1, characterized in that: The hoisting annular slide assembly comprises an inner hoisting annular slide and an outer hoisting annular slide, wherein the inner hoisting annular slide is arranged between the external gear rotary bearing and the outer hoisting annular slide; Each inner and outer sliding track includes at least two annular slideways, and at least one annular slideway is arranged between the outer gear rotary bearing and the hoisting inner annular slideway, and between the hoisting inner annular slideway and the hoisting outer annular slideway.

3. A large-scale cryogenic liquefied natural gas storage tank dome installation device according to claim 1, characterized in that: The inner and outer sliding track assembly comprises at least two inner and outer sliding tracks, the front end of each inner and outer sliding track is connected to the outer bearing of the external gear rotary bearing; the middle and rear ends of the inner and outer sliding tracks are both slidably connected to different annular slideways.

4. A large-scale cryogenic liquefied natural gas storage tank dome installation device according to claim 1, characterized in that: The inner and outer sliding track assembly comprises a plurality of inner and outer sliding tracks, a sliding rack is arranged on the inner track wall of the inner and outer sliding track, an inner and outer sliding motor is mounted on an inner and outer sliding mounting seat, an output shaft of the inner and outer sliding motor passes through the inner and outer sliding mounting seat and is connected to a sliding gear, and the sliding gear is meshed with the sliding rack; The annular slide is installed on the inner and outer slide mounting seats. An annular slide groove is provided on the annular slide. An annular rack is installed in the annular slide groove. The guide wheel is meshed and connected with the annular rack. The guide wheel moves in the annular slide groove through the rotational power provided by the sliding motor.

5. A large-scale cryogenic liquefied natural gas storage tank dome installation device according to claim 1, characterized in that: It also includes a first connecting block and a second connecting block that are matched in pairs, wherein a first plug-in slot is provided at one side end of the first connecting block, and a second plug-in piece that is plug-matched with the first plug-in slot is installed at a corresponding side end of the second connecting block; The first connecting block and the second connecting block are both provided with mounting threaded holes.

6. A large-scale cryogenic liquefied natural gas storage tank dome installation device according to claim 5, characterized in that: The first plug-in slot is a trapezoidal slot, the lower bottom of which is arranged on the surface of the first connecting block, and the upper bottom of which is arranged inside the first connecting block; the second connector is a trapezoidal block, and the lower bottom of the second plug-in block is located on the surface of the second connecting block.

7. A method for dome installation using a large cryogenic liquefied natural gas storage tank dome installation device according to claim 1, characterized in that: A central mounting support frame is set up at the center of the storage tank, an external gear rotary bearing is installed on the top of the central mounting support frame, and the central mounting support frame includes a hollow transport channel; A mounting bracket is added inside and / or outside the storage tank, and the hoisting annular slideway assembly is mounted above the storage tank by the mounting bracket; Divide the dome into a central part, a transition part and an outer edge part, and pre-join them; The central part is lifted to high altitude by the hoisting electric hoist through the transport channel, and the transition part and the outer edge part are lifted to high altitude by other splicing electric hoists, and spliced ​​with other parts already in the air through the movable track of the splicing electric hoist until the entire dome is spliced.

8. A method for installing a large cryogenic liquefied natural gas storage tank dome according to claim 7, characterized in that: A plurality of internal mounting support frames are arranged inside the storage tank, and a plurality of external mounting support frames are arranged outside the storage tank, wherein the internal mounting support frames can pass through the holes in the pre-joined parts of the dome; Divide the structure distribution according to the pre-joined parts of the dome, set the position of the internal installation support frame to avoid interference when hoisting the pre-joined parts of the dome; Each inner and outer sliding track includes at least two annular slideways, at least one annular slideway is arranged between the outer gear rotary bearing and the hoisting inner annular slideway, and between the hoisting inner annular slideway and the hoisting outer annular slideway, and at least one spliced ​​electric hoist is arranged on the annular slideway to slide with it; Through the displacement of the splicing electric hoist on the annular slide, the transition part and the central part are first hoisted and spliced ​​and pre-welded, and then the outer edge part is hoisted to a high altitude and assembled with the pre-spliced ​​part.

9. A method for installing a large cryogenic liquefied natural gas storage tank dome according to claim 7 or 8, characterized in that: Install the first connection block or the second connection block on the ends of the pre-joined central part, transition part and outer edge part on the ground; A first connection block is installed on one side of the outer end of the central part, and a second connection block is installed on the same side of the position where the transition part and the central part are spliced; A first connection block is installed on one side of the position where the transition part and the outer edge part are spliced, and a second connection block is installed on the same side of the position where the outer edge part and the transition part are spliced; The second plug-in connector on the second connecting block is gradually inserted into the first plug-in slot by sliding the spliced ​​electric hoist on the annular slideway; A current sensor is provided to control the sliding motor to stop. When the second connector is completely inserted into the first connector slot, the current sensor detects the change in current value and controls the sliding motor to stop. At this time, the assembly of the two pre-joined parts is completed. The pre-assembled splicing electric hoist is released after the pre-welding is completed, and the released splicing electric hoist continues to hoist other parts to be spliced.

10. A method for installing a large cryogenic liquefied natural gas storage tank dome according to claim 7, characterized in that: The central part is the middle part of the dome; the transition part is the middle part of the dome, the middle part is divided into a plurality of pre-joined middle part blocks, and the projection of each middle part block is a rectangle; the outer edge part is the outer edge part of the dome, the outer edge part is divided into a plurality of pre-joined outer edge part blocks, and the projection of each outer edge part block is a trapezoid.

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