A rotating arm device for film tank ceiling

Abstract

The present invention discloses a swivel arm device for a film tank ceiling, belonging to the technical field of oil and gas storage and transportation; the swivel arm device is used to be installed on the edge of the film tank ceiling, and the swivel arm end can be rotated according to the installation requirements to realize the function of opening and retracting the swivel arm; the swivel arm device includes: a swivel arm end and a fixed arm end; the end of the swivel arm end is rotatably connected to the front end of the fixed arm end through a swivel mechanism, and the end of the fixed arm end is fixedly connected to the outer ring beam of the ceiling; when the swivel arm end and the fixed arm end are in a retracted state or an open state, they are limited by a limiting mechanism. The present invention can realize the reservation of the construction space required around the film tank ceiling and the sealing of the ceiling after construction, facilitate the free movement of the hanging basket for the film tank wall construction up and down and circumferentially, optimize the construction measures, and improve the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas storage and transportation, and in particular to a rotating arm device for a membrane tank ceiling. Background Art

[0002] Natural gas is a mixture of hydrocarbons and non-hydrocarbon gases. In petroleum geology, it is generally referred to as oilfield gas and gasfield gas. It is an important fuel and chemical raw material. In recent years, with the rapid development of my country's industrial, civil, military and other fields, the demand for natural gas is gradually increasing. In order to meet the supply and demand requirements and ensure my country's energy security, a large number of LNG receiving stations with the function of storing and transporting natural gas are needed. LNG receiving stations include docks and tank areas, among which the tank area is the place where LNG is stored. The normal working environment is low temperature and normal pressure. The LNG storage tanks currently used in engineering can be divided into four categories according to their structure: single containment tanks, double containment tanks, full containment tanks and membrane tanks. Among them, membrane tanks can clearly separate the structure, insulation and airtightness, and effectively improve the performance of each part; and because of the design of the membrane concept, its volume has no theoretical limit value, and it is extremely beneficial to increase the storage capacity of a single tank, so it is one of the current research hotspots of LNG storage tanks.

[0003] Large-scale LNG membrane tanks use air pressure to lift the top to complete the capping operation. Air pressure lifting is a common method for capping large-scale LNG storage tanks. It means relying on buoyancy and lifting force to lift the tank arch and ceiling to the installation elevation position to facilitate subsequent welding operations. In actual construction, in order to prevent the arch and ceiling from damaging the membrane tank wall insulation layer and tank wall membrane board during the lifting process, the membrane tank wall insulation layer and tank wall membrane board should be installed after the top is lifted; since the installation of the tank wall insulation layer and tank wall membrane board requires the setting of an operating platform or the use of a construction hanging basket, a certain size margin must be left at the edge of the ceiling to ensure the normal installation of the tank wall insulation layer and membrane board, but theoretically, the ceiling and the tank wall membrane board must be sealed to prevent natural gas from overflowing upwards to the greatest extent. Therefore, finding a method that does not hinder the installation of the tank wall insulation board and the tank wall membrane, and does not affect the sealing effect of the membrane tank ceiling, is one of the problems that must be solved in the current membrane tank installation project.

[0004] Patent CN113863502A proposes a connection structure of steel columns and steel beams, which includes steel columns, steel beams, corbels and a shear sliding system. All components in the entire connection structure are connected to the shear sliding system, which can ensure the overall lateral movement of the steel beam, help release the large temperature stress caused by the excessive lateral length of the structure, and effectively reduce the amount of steel used in the structure, so that the entire structure remains stable in the longitudinal and lateral directions. However, this structure is limited by its structural characteristics, the overall adjustment range is small, manual size adjustment is difficult, and it is greatly affected by temperature and difficult to adapt to the temperature environment in the film tank, so it cannot be used in the tank body.

[0005] Patent CN215889232U proposes an assembled ceiling wall top interface trimming internal angle fitting, wherein the inner connecting plate is used to connect the original top surface and the wall surface; the outer connecting plate is divided into three parts, namely, a ceiling limiting part for limiting the position of the ceiling panel, a wall limiting part for limiting the position of the wall panel, and an outer arc-shaped connecting part for connecting the first two parts. The accessory also has multiple reinforcement parts, which can strengthen the connection strength between the outer arc-shaped connecting part and the inner arc-shaped connecting part, so it has a higher degree of support and better limiting function. However, due to the use of a large number of reinforcement structures, the structure results in a relatively fixed usage scenario of the accessory, which only has a limiting support function and cannot adjust its overall structure according to actual working conditions. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a rotating arm device for a film tank ceiling.

[0007] The invention discloses a rotating arm device for a film tank ceiling, comprising: a rotating arm end and a fixed arm end;

[0008] The end of the rotating arm end is rotatably connected to the front end of the fixed arm end through a rotating mechanism, and the end of the fixed arm end is fixedly connected to the outer ring beam of the ceiling; when the rotating arm end and the fixed arm end are in a retracted state or an open state, they are limited by a limiting mechanism.

[0009] As a further improvement of the present invention, the arm end includes an arm web and an arm upper wing plate and an arm lower wing plate welded and fixed to the arm web, and the overall structure is an inverted T-shaped structure. The length of the arm lower wing plate is longer than the arm upper wing plate; that is, the arm upper wing plate is located at the end of the arm end, and the position of the arm end corresponding to the arm upper wing plate is an I-shaped structure, and the remaining part is an inverted T-shaped structure, thereby ensuring the structural strength of the arm end.

[0010] As a further improvement of the present invention, the fixed arm end includes a fixed arm web and a fixed arm upper wing plate and a fixed arm lower wing plate welded and fixed to the fixed arm web, and the overall structure is an I-shaped structure. The lengths of the fixed arm upper wing plate and the fixed arm lower wing plate are the same and are both smaller than the length of the fixed arm web; further, the lengths of the fixed arm upper wing plate and the fixed arm lower wing plate are approximately half of the length of the fixed arm web.

[0011] As a further improvement of the present invention, the upper wing plate of the fixed arm and the lower wing plate of the fixed arm are located at the front end of the web plate of the fixed arm, the end of the web plate of the fixed arm is welded and fixed to the outer ring beam of the ceiling, the lower wing plate of the rotating arm extends to be aligned with the outer ring beam of the ceiling, and the lower wing plate of the rotating arm and the lower part of the outer ring beam of the ceiling are used for laying the ceiling board.

[0012] As a further improvement of the present invention, the slewing mechanism includes a rotating shaft assembly, the rotating shaft assembly includes a rotating shaft, and the rotating shaft passes through the upper wing plate of the rotating arm, the lower wing plate of the rotating arm, the upper wing plate of the fixed arm and the lower wing plate of the fixed arm and is fixed by fasteners.

[0013] As a further improvement of the present invention, the limiting mechanism includes a limiting plate and a limiting assembly;

[0014] A folding hole and an opening hole are provided on the upper wing plate of the rotating arm, and a limiting hole is provided on the upper wing plate of the fixed arm; when the two ends of the limiting plate are fixed to the folding hole and the limiting hole through the limiting assembly, the folding of the rotating arm end is achieved; when the two ends of the limiting plate are fixed to the opening hole and the limiting hole through the limiting assembly, the opening of the rotating arm end is achieved.

[0015] As a further improvement of the present invention, in the retracted state, the angle between the rotating arm end and the fixed arm is no more than 90°; in the extended state, the angle between the rotating arm end and the fixed arm is 180°.

[0016] As a further improvement of the present invention, the material of the rotating arm device can be selected from carbon steel or stainless steel according to the temperature, pressure and corrosion conditions in the tank body.

[0017] As a further improvement of the present invention, for different tank environments, the specific length of the rotating arm end can be adjusted according to the actual distance between the membrane tank wall and the ceiling, but considering the operating stability of the device, the length of the rotating arm end is not shorter than the length of the fixed arm end.

[0018] As a further improvement of the present invention, when the suspended ceiling is being lifted by air pressure, the rotating arm end is in a retracted state; when the film tank wall around the suspended ceiling is processed, the hanging basket is retracted, the rotating arm end is switched from the retracted state to the open state, and the outer ceiling panel is laid, installed and sealed on the upper part.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The rotating arm device of the present invention can be specifically designed according to factors such as the shape and size of the film tank body on site, and can realize the reservation of the construction space required around the film tank ceiling and the sealing of the ceiling after construction, so as to facilitate the free movement of the hanging basket for the film tank wall construction up and down and circumferentially, optimize the construction measures, and improve the construction efficiency;

[0021] In addition, the rotating arm device of the present invention does not include a complex mechanism, and all transmission methods are realized through a simple mechanism, thereby greatly simplifying the manufacturing process of the device, improving the processing efficiency of the device and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the rotating arm device for the film tank ceiling disclosed in the present invention;

[0023] Figure 2 It is a top view of the rotating arm device for the film tank ceiling disclosed in the present invention in a retracted state;

[0024] Figure 3 It is a top view of the rotating arm device for the film tank ceiling disclosed by the present invention in an open state;

[0025] Figure 4 It is an axonometric view of the rotating arm device for the film tank ceiling disclosed in the present invention in a retracted state;

[0026] Figure 5 The isometric view of the rotating arm device for the membrane tank ceiling disclosed in the present invention in the open state.

[0027] In the figure:

[0028] 1. Swivel arm web; 2. Swivel arm upper wing plate; 3. Swivel arm lower wing plate; 4. Fixed arm web; 5. Fixed arm upper wing plate; 6. Fixed arm lower wing plate; 7. Limit plate; 8. Stowage hole; 9. Open hole; 10. Limit hole; 11. Limit assembly; 12. Rotating shaft assembly; 13. Ceiling outer ring beam; 14. Ceiling plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0031] like Figure 1 As shown, the present invention provides a swivel arm device for a film tank ceiling, which is used to be installed on the edge of the film tank ceiling and can be rotated according to installation requirements to realize the function of opening and retracting the swivel arm, thereby realizing the reservation of the construction space required around the film tank ceiling and the sealing of the ceiling after construction; it includes: a swivel arm end, a fixed arm end, a swivel mechanism and a limiting structure; wherein, the end of the swivel arm end of the present invention is rotatably connected to the front end of the fixed arm end through a swivel mechanism; the end of the fixed arm end is fixedly connected to the outer ring beam 13 of the ceiling; when the swivel arm end and the fixed arm end are in a retracted state or an open state, they are limited by the limiting mechanism.

[0032] Specific:

[0033] The arm end of the present invention includes an arm web 1, an arm upper wing plate 2 and an arm lower wing plate 3. The arm upper wing plate 2 is welded and fixed to the upper side of the arm web 1, and the arm lower wing plate 3 is welded and fixed to the lower side of the arm web 1. The length of the arm lower wing plate 3 is longer than the arm upper wing plate 2. Furthermore, the length of the arm upper wing plate 2 is only about one-fourth of the arm lower wing plate 3. The arm end is an inverted T-shaped structure as a whole. When performing supporting operations, the inverted T-shaped structure greatly enhances the bearing capacity of the arm end, and is reinforced by the I-shaped structure at the end, and has a very high ability to resist vertical bending deformation failure. The arm lower wing plate 3 extends to the end of the arm web 1, and plays a role in supporting and fastening the arm web 1. The inverted T-shaped structure can greatly enhance the bearing capacity of the arm end, thereby ensuring that the arm web 1 can withstand the weight of the ceiling plate 14 attached to the top in the open state. Two limiting holes are arranged on the upper wing plate 2 of the swing arm, namely, a folding hole 8 and an opening hole 9, which can respectively ensure that the opening and folding angles of the swing arm end meet the operating requirements. They mainly play two roles in the swing arm end. One is that they form an I-shaped reinforcement structure with the lower wing plate 3 of the swing arm below, which further strengthens the structural strength of the swing arm end; the other is to limit the rotation range of the swing arm end by means of the folding hole 8 and the opening hole 9, so as to prevent excessive displacement from affecting the strength and service life of the device structure.

[0034] The fixed arm end of the present invention is the connecting part between the rotating arm end and the outer ring beam of the ceiling, and is welded by the fixed arm upper wing plate 5, the fixed arm web plate 4 and the fixed arm lower wing plate 6; since the fixed arm end is shorter than the rotating arm end and mainly plays a connecting role, the structural strength requirements are relatively high. In order to ensure that no failure occurs during actual operation, the fixed arm end adopts an I-shaped structure, which can maximize the structural strength in the vertical direction. Among them, the fixed arm upper wing plate 5 and the fixed arm lower wing plate 6 are the same size, which is about half of the fixed arm web plate 4, so as to leave a certain size margin to ensure that there is no interference with the ceiling. In order to realize the limiting function and match the function of the rotating arm upper wing plate 2, a limiting hole 10 is provided on the fixed arm upper wing plate 5, and the hole position is mainly used to fix and constrain the upper limiting plate 7.

[0035] The slewing mechanism of the present invention includes a rotating shaft assembly 12, which includes a rotating shaft, a shaft sleeve and a fastening nut, the shaft sleeve is sleeved on the rotating shaft, and the rotating shaft passes through the upper wing plate 2 of the rotating arm, the lower wing plate 3 of the rotating arm, the upper wing plate 5 of the fixed arm and the lower wing plate 6 of the fixed arm and is fixed by a fastening nut; the limiting mechanism includes a limiting plate 7 and a limiting assembly 11, and the limiting assembly 11 includes a limiting bolt and a limiting nut for fixing the limiting plate; when the two ends of the limiting plate 7 are fixed to the folding hole 8 and the limiting hole 10 by the limiting assembly, the folding of the rotating arm end is realized; when the two ends of the limiting plate 7 are fixed to the opening hole 9 and the limiting hole 10 by the limiting assembly, the opening of the rotating arm end is realized, thereby ensuring that the rotating arm device does not collide and interfere with the ceiling when folded, and does not cause excessive displacement that affects the structural strength when opened. When the ceiling is in use, the limit plate 7 connects the retracting hole 8 of the upper wing plate 2 of the rotating arm with the limit hole 10 of the upper wing plate 5 of the fixed arm, so that the rotating arm is retracted at a fixed angle. At this time, the state of the rotating arm device is as follows: Figure 2 As shown, sufficient space for the construction of the hanging basket is reserved to prevent interference with the subsequent processing and installation of the film tank wall around the ceiling; when the film tank wall around the ceiling is processed, the hanging basket is folded, the connection hole position of the limit plate is changed, and the opening hole 9 of the upper wing plate 2 of the rotating arm is connected with the limit hole 10 of the upper wing plate 5 of the fixed arm, so that the rotating arm device is fully unfolded. At this time, the state of the rotating arm device is as shown in FIG. Figure 3 As shown, the outer ceiling board 14 is laid, installed and sealed on the upper part. Under the fixing action of the rotating arm device, the ceiling and the tank wall are in a relatively stable state, which greatly avoids the vibration generated when laying the ceiling board from damaging the ceiling and the installed tank wall.

[0036] In actual working conditions, the weight of the outer ceiling board will increase with the increase of the inner diameter of the tank body. Therefore, in order to ensure that the swivel arm device can withstand a large load, in addition to selecting a material with higher strength, it is also necessary to enhance its structural strength as much as possible. Therefore, in addition to the reinforcement form adopted in the swivel arm end and the fixed arm end, the device also extends the length of the swivel arm lower wing plate 3 inward to make it flush with the fixed arm lower wing plate 6, and uses the swivel arm lower wing plate 3 to reinforce the overall structure. Figure 4 , Figure 5 It is an axonometric diagram of the swivel arm device after reinforcement; it can be seen from the figure that when the swivel arm device is folded, the lower wing plate 3 of the swivel arm is folded horizontally, and there is no reinforcement effect at this time; when the swivel arm device is opened, the lower wing plate 3 of the swivel arm and the lower wing plate 6 of the fixed arm partially overlap, and at this time the lower wing plate 3 of the swivel arm and the top limit plate 7 jointly provide a reinforcement effect of structural strength, but due to the surface contact method, the upper surface of the lower wing plate 3 of the swivel arm and the lower surface of the lower wing plate 6 of the fixed arm are smoothed to reduce the damage caused by friction.

[0037] Furthermore, the material of the rotating arm device can be selected from carbon steel or stainless steel according to the temperature, pressure and corrosion conditions in the tank body.

[0038] Furthermore, for different tank environments, the specific length of the rotating arm end can be adjusted according to the actual distance between the membrane tank wall and the ceiling, but considering the operating stability of the device, the length of the rotating arm end is not shorter than the length of the fixed arm end.

[0039] The advantages of the present invention are:

[0040] The rotating arm device of the present invention can be specifically designed according to factors such as the shape and size of the film tank body on site, and can realize the reservation of construction space required around the film tank ceiling and the sealing of the ceiling after construction, so as to facilitate the free up and down and circumferential movement of the hanging basket for the construction of the film tank wall, optimize the construction measures, and improve the construction efficiency; in addition, the rotating arm device of the present invention does not include a complex mechanism, and all transmission methods are realized by a simple mechanism, thereby greatly simplifying the manufacturing process of the device, improving the processing efficiency of the device and reducing the production cost.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotating arm device for a film tank ceiling, characterized in that: include: Swivel arm end and fixed arm end; The end of the rotating arm end is rotatably connected to the front end of the fixed arm end through a slewing mechanism, and the end of the fixed arm end is fixedly connected to the outer ring beam of the ceiling; when the rotating arm end and the fixed arm end are in a retracted state or an open state, they are limited by a limiting mechanism; The arm end comprises an arm web, an arm upper wing plate and an arm lower wing plate welded and fixed to the arm web, and the whole is an inverted T-shaped structure, and the length of the arm lower wing plate is longer than that of the arm upper wing plate.

2. The rotating arm device according to claim 1, characterized in that: The fixed arm end includes a fixed arm web and a fixed arm upper wing plate and a fixed arm lower wing plate welded and fixed to the fixed arm web, and the overall structure is an I-shaped structure. The lengths of the fixed arm upper wing plate and the fixed arm lower wing plate are consistent and both are smaller than the length of the fixed arm web.

3. The rotating arm device according to claim 2, characterized in that: The upper wing plate of the fixed arm and the lower wing plate of the fixed arm are located at the front end of the web plate of the fixed arm, the end of the web plate of the fixed arm is welded and fixed to the outer ring beam of the ceiling, the lower wing plate of the rotating arm extends to be aligned with the outer ring beam of the ceiling, and the lower wing plate of the rotating arm and the lower part of the outer ring beam of the ceiling are used for laying the ceiling board.

4. The rotating arm device according to claim 2, characterized in that: The slewing mechanism comprises a rotating shaft assembly, and the rotating shaft assembly comprises a rotating shaft, and the rotating shaft passes through an upper wing plate of a rotating arm, a lower wing plate of a rotating arm, an upper wing plate of a fixed arm, and a lower wing plate of a fixed arm and is fixed by a fastener.

5. The rotating arm device according to claim 2, characterized in that: The limiting mechanism includes a limiting plate and a limiting component; A folding hole and an opening hole are provided on the upper wing plate of the rotating arm, and a limiting hole is provided on the upper wing plate of the fixed arm; when the two ends of the limiting plate are fixed to the folding hole and the limiting hole through the limiting assembly, the folding of the rotating arm end is achieved; when the two ends of the limiting plate are fixed to the opening hole and the limiting hole through the limiting assembly, the opening of the rotating arm end is achieved.

6. The rotating arm device according to claim 5, characterized in that: In the retracted state, the angle between the rotating arm end and the fixed arm is no more than 90°; in the extended state, the angle between the rotating arm end and the fixed arm is 180°.

7. The rotating arm device according to claim 1, characterized in that: The rotating arm device is made of carbon steel or stainless steel.

8. The rotating arm device according to claim 1, characterized in that: The length of the rotating arm end is not shorter than the length of the fixed arm end.

9. The rotating arm device according to claim 1, characterized in that: When the ceiling is being lifted by air pressure, the arm end is in a retracted state; when the film tank wall around the ceiling is processed, the hanging basket is retracted, the arm end is switched from the retracted state to the open state, and the outer ceiling panels are laid, installed and sealed on the upper part.

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