Liquefied natural gas (LNG) storage tank guide chain lifting and inversing construction device and using method thereof

Abstract

The invention discloses an LNG storage tank guide chain lifting and upside-down construction device and a using method thereof.The LNG storage tank guide chain lifting and upside-down construction device comprises a working vertical rod, the working vertical rod is arranged on a fixing assembly, the fixing assembly is embedded in the working ground, a lifting plate is arranged at the top end of the working vertical rod, a lifting assembly is arranged on the lifting plate, an auxiliary assembly is arranged on the working vertical rod, and a transition assembly is arranged on the working vertical rod; the auxiliary assembly and the transition assembly are both connected with the lifting assembly. Through the movement of the moving disc on the moving track and the rotation function of the rotating disc, the position and the use direction of the LNG storage tank guide chain lifting upside-down construction device can be conveniently adjusted, so that the LNG storage tank guide chain lifting upside-down construction device adapts to different construction environments and requirements, the flexibility of the device is greatly improved, the application range of the device is greatly widened, and the LNG storage tank guide chain lifting upside-down construction device is clear in design structure and convenient to use. And the connection relationship among the components is clear, so that daily maintenance and operation are facilitated. Meanwhile, electrical elements are externally connected with a power supply and a control switch, so that control and management are easy, and normal use and efficient operation of the device are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of thermal pipelines, in particular to a LNG storage tank guide chain lifting and inverted installation construction device and a use method thereof. Background Art

[0002] LNG storage tank is a type of chemical storage tank. LNG stands for Liquefied Natural Gas in English, which means liquefied natural gas. Therefore, LNG storage tank is also called liquefied natural gas storage tank, which is specially used to store liquefied natural gas.

[0003] In the prior art, the processing and installation of LNG storage tanks mostly adopts traditional fastening devices, and then installs the bottom and top, which requires a large number of people to carry and assist in reinforcement, requires a lot of manpower and space, and has low work efficiency.

[0004] Therefore, it is necessary to propose an LNG tank guide chain lifting and inverted installation construction device and a use method thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a LNG storage tank guide chain lifting inverted installation construction device and a use method thereof. The device has a reasonable and compact structure, can adapt to different construction environments, and greatly improves the flexibility of the device.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an LNG tank guide chain lifting and inverted installation construction device, the LNG tank guide chain lifting and inverted installation construction device includes a working pole, the working pole is arranged on a fixed component, the fixed component is embedded in the working ground, a hanging plate is provided on the top of the working pole, a lifting component is provided on the hanging plate, an auxiliary component is provided on the working pole, and a transition component is provided on the working pole, and the auxiliary component and the transition component are both connected to the lifting component.

[0007] Furthermore, the fixed component includes a fixed chassis, which is embedded in the working bottom surface, a moving track is provided on the upper part of the fixed chassis, a moving disk is provided on the moving track, a rotating disk is provided on the moving disk, a moving motor is provided on one side of the rotating disk, the moving motor is connected to a moving gear, an auxiliary track chain is provided on the inner side of the moving track, the auxiliary track chain is connected to the moving gear, proximity switches are provided at both ends of the moving track, a monitoring probe is provided at one end of the moving track, and a monitoring signal receiving board is provided at the other end of the moving track.

[0008] Furthermore, the hanging plate is provided with a circular hanging hole.

[0009] Furthermore, the lifting assembly includes an electric hoist, one end of the electric hoist is connected to the hanging plate through a connecting chain, the other end of the electric hoist is connected to a lifting ear through a connecting chain, the lifting ear is arranged on the storage tank, a fastening circular plate is arranged at the lower part of the lifting ear, the fastening circular plate is sleeved on the storage tank, an auxiliary ball is arranged on the connecting chain at one end of the electric hoist, the auxiliary ball is connected to the auxiliary assembly, and a transition ball is arranged on the connecting chain at the other end of the electric hoist, the transition ball is connected to the transition assembly.

[0010] Furthermore, the working diameter of the auxiliary ball is larger than the working diameter of the transition ball.

[0011] Furthermore, the auxiliary component includes an auxiliary seat, which is arranged on the working upright pole. The auxiliary seat is provided with an auxiliary spring, and the top of the auxiliary spring is provided with an auxiliary round bowl, which is connected to the auxiliary ball.

[0012] Furthermore, the transition assembly includes a transition rod, which is arranged on the working upright rod, a transition spring is sleeved on the transition rod, a transition groove is arranged on the top end of the transition rod, and the transition groove is connected to the transition ball.

[0013] The method for using the above-mentioned LNG tank guide chain lifting inverted installation construction device includes:

[0014] S1, calculate the load capacity of the electric hoist and determine the number of electric hoists to be used;

[0015] S2, determine the stability of the work pole according to actual production needs, and select a work pole with good stability performance;

[0016] S3, complete the welding of the storage tank and install ladders or other auxiliary devices according to actual production needs;

[0017] S4, connect the lifting lug to the electric hoist;

[0018] S5, expansion ring clips are arranged on both sides of the welding point between the lifting lug and the storage tank;

[0019] S6. Add a back bar expansion ring at the bottom of the tank;

[0020] S7, use a reinforcement tool to tightly connect the back bar expansion ring to the tank wall;

[0021] S8, welding the lifting lug and the back bar expansion ring;

[0022] S9, multiple electric hoists are used in parallel;

[0023] S10, the electric hoists can be started at the same time or used separately. The electric hoists are started to lift the tank wall.

[0024] Beneficial effects of the present invention:

[0025] The present invention can conveniently adjust the position and use direction of the LNG tank chain guide lifting and inverted installation construction device through the movement of the moving plate on the moving track and the rotation function of the rotating plate, so as to adapt to different construction environments and needs, greatly improving the flexibility and application scope of the device. The present invention has a clear design structure and a clear connection relationship between the various components, which is convenient for daily maintenance and operation. At the same time, the electrical components are all externally connected to the power supply and control switch, which is easy to control and manage, ensuring the normal use and efficient operation of the device. The design includes some complex mechanical and electrical components, but its overall structure is compact and comprehensive, which can significantly improve construction efficiency and safety. In the long run, it has high cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the fixing component in the present invention;

[0029] Figure 4 for Figure 2 A1 is a partial enlarged view;

[0030] Figure 5 for Figure 2 A2 is a partial enlarged view.

[0031] In the figure:

[0032] 1. Working pole; 2. Fixed assembly; 3. Hanging plate; 4. Lifting assembly; 5. Auxiliary assembly; 6. Transition assembly; 21. Fixed chassis; 22. Moving track; 23. Moving disk; 24. Rotating disk; 25. Moving motor; 26. Proximity switch; 27. Monitoring probe; 28. Monitoring signal receiving board; 41. Electric hoist; 42. Connecting chain; 43. Lifting ear; 44. Fastening round plate; 45. Auxiliary ball; 46. Transition ball; 51. Auxiliary seat; 52. Auxiliary spring; 53. Auxiliary round bowl; 61. Transition rod; 62. Transition spring; 63. Transition groove. DETAILED DESCRIPTION

[0033] The following detailed description is made of the LNG storage tank guide chain lifting and inverted installation construction device and the use method thereof of the present invention with reference to the accompanying drawings of the specification.

[0034] The present invention provides a technical solution: a LNG storage tank guide chain lifting inverted installation construction device, such as Figure 1-Figure 5As shown, the LNG storage tank guide chain lifting inverted construction device and the use method thereof, the LNG storage tank guide chain lifting inverted construction device, includes a working pole 1, the working pole 1 is arranged on a fixed component 2, the fixed component 2 is embedded in the working ground, the top of the working pole 1 is provided with a hanging plate 3, the hanging plate 3 is provided with a lifting component 4, the working pole 1 is provided with an auxiliary component 5, the working pole 1 is provided with a transition component 6, the auxiliary component 5 and the transition component 6 are both connected to the commission component. When using the present invention, it is necessary to connect them together according to the connection relationship of each component. The electrical components in the present invention are all externally connected to a power supply and a control switch to ensure the normal use of the present invention. The fixed component 2 in the present invention can be fixed, and can be moved and locked, which expands the use scope of the fixed component 2, further expands the working dimension of the lifting component 4, increases the use scope of the present invention, saves manpower, reduces the investment of manpower and material resources, and reduces the waste of resources.

[0035] Specifically, the fixed component 2 described in this embodiment includes a fixed chassis 21, which is embedded in the working bottom surface. A moving track 22 is provided on the upper part of the fixed chassis 21, a moving disk 23 is provided on the moving track 22, a rotating disk 24 is provided on the moving disk 23, a moving motor 25 is provided on one side of the rotating disk 24, and the moving motor 25 is connected to a moving gear. An auxiliary track chain is provided on the inner side of the moving track 22, and the auxiliary track chain is connected to the moving gear. Proximity switches 26 are provided at both ends of the moving track 22, a monitoring probe 27 is provided at one end of the moving track 22, and a monitoring signal receiving board 28 is provided at the other end of the moving track 22. In this embodiment, the moving disk 23 can move along the moving track 22, and the moving motor 25 is started to drive the moving gear to rotate on the auxiliary track chain, driving the moving disk 23 to move along the moving track 22. The rotating disk 24 can be rotated to adjust the use direction of the present invention and increase the use scope of the present invention. The monitoring probe 27 can transmit a signal to the monitoring signal receiving board to ensure the stability of the moving disk 23 when it moves along the moving track 22. When the moving disk 23 is out of the moving track 22, the monitoring signal receiving board 28 cannot receive the signal sent by the monitoring probe 27, prompting the staff that the present invention has a fault. The proximity switches 26 at both ends of the moving track 22 prevent the moving disk 23 from excessive movement to ensure the safety of the present invention.

[0036] Specifically, the lifting assembly 4 of this embodiment includes an electric hoist 41, one end of the electric hoist 41 is connected to the hanging plate 3 through a connecting chain 42, and the other end of the electric hoist 41 is connected to a lifting lug 43 through the connecting chain 42. The lifting lug 43 is arranged on the storage tank, and a fastening circular plate 44 is arranged at the lower part of the lifting lug 43. The fastening circular plate 44 is sleeved on the storage tank. An auxiliary ball 45 is arranged on the connecting chain 42 at one end of the electric hoist 41, and the auxiliary ball 45 is connected to the auxiliary assembly 5. A transition ball 46 is arranged on the connecting chain 42 at the other end of the electric hoist 41, and the transition ball 46 is connected to the transition assembly 6. The hanging plate 3 is provided with a circular lifting hole. The working diameter of the auxiliary ball 45 is greater than the working diameter of the transition ball 46. The auxiliary assembly 5 includes an auxiliary seat 51, which is arranged on the working upright 1, and an auxiliary spring 52 is arranged on the auxiliary seat 51. An auxiliary round bowl 53 is arranged on the top of the auxiliary spring 52, and the auxiliary round bowl 53 is connected to the auxiliary ball 45. The transition assembly 6 includes a transition rod 61, which is arranged on the working upright pole 1, and a transition spring 62 is sleeved on the transition rod 61. A transition groove 63 is arranged on the top of the transition rod 61, and the transition groove 63 is connected to the transition ball 46. In this embodiment, after the electric hoist 41 is started, the auxiliary ball 45 will be close to the auxiliary round bowl 53, and the auxiliary spring 52 will shrink when receiving the pressure of the auxiliary ball 45, and will absorb part of the pulling force of the electric hoist 41 on the hanging plate 3. At the same time, the transition ball 46 will move along the transition groove 63 to ensure that the lifting direction of the electric hoist 41 on the storage tank is correct, and the working efficiency of the present invention is ensured. At the same time, the transition rod 61 is a retractable rod, which is combined with the transition spring 62 to form a simple damping, which can reduce the pulling force of the electric hoist 41 on the working upright pole 1 and extend the service life of the present invention.

[0037] The method for using the LNG storage tank guide chain lifting inverted installation construction device includes S1, calculating the load force of the electric hoist 41 and determining the number of electric hoists 41 to be used;

[0038] S2, judging the stability of the working pole 1 according to actual production requirements, and selecting a working pole 1 with good stability performance;

[0039] S3, complete the welding of the storage tank and install ladders or other auxiliary devices according to actual production needs;

[0040] S4, connecting the lifting lug 43 to the electric hoist 41;

[0041] S5, setting expansion ring clips on both sides of the welding point between the lifting ear 43 and the storage tank;

[0042] S6. Add a back bar expansion ring at the bottom of the tank;

[0043] S7, use a reinforcement tool to tightly connect the back bar expansion ring to the tank wall;

[0044] S8, welding the lifting lug 43 to the back bar expansion ring;

[0045] S9, multiple electric hoists 41 are used in parallel;

[0046] S10, the electric hoists 41 can be started simultaneously or used alone, and the electric hoists 41 are started to lift the tank wall.

[0047] In this embodiment, the load capacity of the electric hoist 41 is calculated by using 60 electric hoists 41, which are evenly distributed in the storage tank. The lifting capacity of each electric hoist 41 is 20T, and 80% of the maximum lifting weight of each electric hoist 41 is calculated as 60*20*80%=960 tons. The maximum weight of the storage tank is 903.621 tons, which is within the bearing range of the electric hoist 41 and can be used safely.

[0048] In the selection and stability check of the working column in this embodiment, the external force on the working column is axial pressure. The stability of the working column is an important factor related to construction safety. Since the traction of the radial and transverse pulls balances the horizontal component Nl×sinθ of the flat angle of the electric hoist 41, the working column is approximately considered to be subjected to only vertical pressure. Therefore, the force calculation of the working column is simplified to the stability calculation of a compression rod with one end fixed and one end free in material mechanics. The stability of the compression rod depends on the slenderness ratio λ and critical stress Fcr of the compression rod. When the slenderness ratio is very large, the critical stress is the main form of failure of the compression rod.

[0049] Critical stress calculation:

[0050] Fcr=π2EI / (μL)2

[0051] μ is the length coefficient, which is related to the constraint conditions of the compression rod. For a compression rod with one end fixed and the other end free, μ is 2; L is the length of the compression rod, which is related to the lifting height of the electric hoist 41 and the height of each circle of wall panels. Here, 4 meters is taken; E is the elastic modulus, and the elastic modulus of carbon steel is 210×109N / m2; I is the minimum moment of inertia of the compression rod section, and the minimum moment of inertia of the pipe is calculated as I=π(D4-d4) / 64

[0052] To ensure the stability of the column, F≥μw×Fcr must be satisfied, where μw is the safety factor, which is 3 to 5, and F is the vertical component of the force on the column. F=Nl×cosθ=〔ΣG / (nxcosθ)〕×cosθ=ΣG / n=6458Kg.

[0053] The following table is an example of critical stress data for steel pipes

[0054]

[0055] according to Figure 1 As shown, the selection of 219*7 seamless steel pipe as the column far exceeds the requirements. In summary, the inverted installation of the electric hoist 41 is feasible.

[0056] In this embodiment, the expansion ring clips are arranged on both sides of each lifting ear 43. This part is the position with the maximum force. The other expansion ring clips are arranged at the expansion ring joint position. Therefore, the position is the position where the expansion ring is weakly stressed, and the expansion ring clips are set to strengthen it. The expansion ring clips are made of 16mm Q345R steel plates, and no less than 140 are set. The maximum weight of the tank is about 903.621 tons, and each clip bears about 6.454 tons, which is converted to MPa of about 645.4MPa, which is lower than the upper limit of the tensile strength of the Q345R steel plate. In summary, the use of the clips meets the conditions. The expansion ring uses 25A I-beams. Since the expansion ring is not the main force-bearing component, it is mainly for the top roundness of the tank body to ensure the roundness, so no calculation is required.

[0057] When assembling the storage tank, the lifting and inverted installation method is adopted, that is, the bottom plate is assembled first, and then the longitudinal weld of the 13th band wall plate (the top circle) is assembled, and the top plate is assembled (the temporary support in the center of the top plate is installed first). After the top plate is welded, the railings, platforms and other accessories on the top plate are installed. According to this method, the 12th band to the 1st band wall plate are welded in sequence, and finally the bottom plate and the wall plate are welded. After completion, the door openings on the remaining 1st and 2nd band wall plates, as well as the tank ladder are installed. After all the wall panels are installed, the lifting device is removed. After all the welding work is completed and passed the inspection, the water filling test and the positive and negative pressure test are carried out. Ensure the accuracy of the storage tank installation.

[0058] The maximum weight of the tank is about 903.621t, and the lifting height is no more than 2.5 meters each time. 60 lifting masts are evenly distributed on the concentric circles about 500mm away from the tank wall inside each tank. The masts are provided with lifting lugs 43, bases and ribs. 60 electric hoists (20T) are fixed on the upper end of the upright column of the pole. The pole is made of medium 219*7 steel pipe and is about 4.8m high. The lower end of each circle of the tank wall is reinforced with a back bar expansion ring, which is made of 25A I-beam arc rolling. The back bar expansion ring is fixed to the tank wall with a gantry fixture. The lifting lug 43 is welded on the back bar expansion ring below the electric hoist 41. The electric hoist 41 lifts the lifting lug 43 through the control device, and transmits the force to the back bar expansion ring and the tank wall to achieve the purpose of lifting the tank wall. The manual hoist can be lifted synchronously or separately.

[0059] When the electric hoist 41 is lifted, it should be commanded uniformly and lifted synchronously. Every time it is lifted about 500mm, it should be stopped to check whether the electric hoist 41 is synchronized and whether the force is evenly applied. If it is synchronized or the force is evenly applied, it can continue to lift. If the electric hoist 41 is lifted differently and the force is uneven, the lagging electric hoist 41 should be controlled and adjusted separately to make it have the same lifting height and the same force state as other electric hoists 41 to avoid accidents. After adjustment, it can be lifted simultaneously again.

[0060] The working columns should be symmetrically distributed, and the distance from the tank wall should be such that the fall chain and the lifting lug are basically on a vertical line. The column installation must be guaranteed to be vertical. If there is a gap in contact with the tank bottom, a thin steel plate can be used for leveling and welded firmly. Two diagonal braces are installed at the 3 / 4 height of the column. The diagonal braces are made of ∠75×7 angle steel. The angle between the diagonal braces and the angle between the diagonal braces and the tank bottom are preferably 45°. Use steel wire ropes to tighten the two symmetrical columns.

[0061] The back bar expansion ring is made in several sections according to the size of the tank. When installing the back bar, use four 16t jacks to tighten the back bar at the position where the back bar is roughly divided into four equal parts, so that it is close to the tank wall, and then use a gantry clamp to fix the back bar and the tank wall together. The four positions where the back bar is tightened with jacks should avoid the inverted columns. The curvature of the back bar after molding should be consistent with the curvature of the inner wall of the tank.

[0062] 60 electric hoists 41 are connected to a control cabinet together, and the power lines from each switch to the hoist are of the same length and wire diameter to avoid inconsistent current loss caused by different lengths and wire diameters, which affects the lifting of the hoist. The control cabinet uses AC contactors of uniform specifications to ensure that each contactor starts normally and works synchronously. Due to the inevitable differences in the synchronization of the motors of the electric hoists 41, it is necessary to install a fine-tuning circuit for a single hoist while lifting the lifting device as a whole, so as to adjust the lifting speed of individual hoists in time, so that the entire lifting system can maintain relatively stable operation and ensure lifting safety.

[0063] The above description is only used to illustrate some principles of the present invention. This specification is not intended to limit the present invention to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

[0064] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art.

Claims

1. LNG tank chain lifting and inverted installation construction device, characterized by: The invention comprises a working pole (1), wherein the working pole (1) is arranged on a fixing component (2), the fixing component (2) is embedded in a working ground, a hanging plate (3) is arranged on the top of the working pole (1), a lifting component (4) is arranged on the hanging plate (3), an auxiliary component (5) is arranged on the working pole (1), a transition component (6) is arranged on the working pole (1), and the auxiliary component (5) and the transition component (6) are both connected to the lifting component.

2. The LNG tank chain guide lifting and inverted installation construction device according to claim 1 is characterized in that: The fixed assembly (2) comprises a fixed chassis (21), the fixed chassis (21) is embedded in the working bottom surface, a moving track (22) is provided on the upper part of the fixed chassis (21), a moving disk (23) is provided on the moving track (22), a rotating disk (24) is provided on the moving disk (23), a moving motor (25) is provided on one side of the rotating disk (24), the moving motor (25) is connected to a moving gear, an auxiliary track chain is provided on the inner side of the moving track (22), the auxiliary track chain is connected to the moving gear, proximity switches (26) are provided at both ends of the moving track (22), a monitoring probe (27) is provided at one end of the moving track (22), and a monitoring signal receiving board (28) is provided at the other end of the moving track (22).

3. The LNG tank chain guide lifting and inverted installation construction device according to claim 1 is characterized in that: The hanging plate (3) is provided with a circular hanging hole.

4. The LNG tank chain guide lifting and inverted installation construction device according to claim 1 is characterized in that: The lifting assembly (4) comprises an electric hoist (41), one end of the electric hoist (41) is connected to the hanging plate (3) via a connecting chain (42), the other end of the electric hoist (41) is connected to a lifting lug (43) via a connecting chain (42), the lifting lug (43) is arranged on the storage tank, a fastening circular plate (44) is arranged at the lower part of the lifting lug (43), the fastening circular plate (44) is sleeved on the storage tank, an auxiliary ball (45) is arranged on the connecting chain (42) at one end of the electric hoist (41), the auxiliary ball (45) is connected to the auxiliary assembly (5), and a transition ball (46) is arranged on the connecting chain (42) at the other end of the electric hoist (41), the transition ball (46) is connected to the transition assembly (6).

5. The LNG tank chain guide lifting and inverted installation construction device according to claim 4 is characterized in that: The working diameter of the auxiliary ball (45) is larger than the working diameter of the transition ball (46).

6. The LNG tank chain guide lifting and inverted installation construction device according to claim 1 is characterized by: The auxiliary assembly (5) comprises an auxiliary seat (51), the auxiliary seat (51) is arranged on the working upright pole (1), an auxiliary spring (52) is arranged on the auxiliary seat (51), an auxiliary round bowl (53) is arranged on the top of the auxiliary spring (52), and the auxiliary round bowl (53) is connected to the auxiliary ball (45).

7. The LNG tank chain guide lifting and inverted installation construction device according to claim 1 is characterized by: The transition assembly (6) comprises a transition rod (61), the transition rod (61) is arranged on the working upright rod (1), a transition spring (62) is sleeved on the transition rod (61), a transition groove (63) is arranged at the top end of the transition rod (61), and the transition groove (63) is connected to the transition ball (46).

8. The method for using the LNG tank chain guide lifting and inverted installation construction device according to any one of claims 1 to 7, characterized in that: include S1, calculating the load capacity of the electric hoist (41) and determining the number of electric hoists (41) to be used; S2, judging the stability of the working pole (1) according to actual production requirements, and selecting a working pole (1) with good stability performance; S3, complete the welding of the storage tank and install ladders or other auxiliary devices according to actual production needs; S4, connecting the lifting lug (43) to the electric hoist (41); S5, setting expansion ring clips on both sides of the welding point between the lifting lug (43) and the storage tank; S6. Add a back bar expansion ring at the bottom of the tank; S7, use a reinforcement tool to tightly connect the back bar expansion ring to the tank wall; S8, welding the lifting lug (43) to the back bar expansion ring; S9, multiple electric hoists (41) are used in parallel; S10, the electric hoist (41) can be started simultaneously or used alone, and the electric hoist (41) is started to lift the tank wall.

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