High-capacity skid-mounted flexible storage device

Abstract

The utility model provides a large-capacity skid-mounted flexible storage device, which relates to the technical field of gas / liquid storage, and comprises a base and a telescopic frame, the top of the base is provided with a flexible tank, and the side wall surface of the flexible tank is respectively provided with a feed end and a discharge end; the telescopic frame is arranged at the top of the base, and the outer wall surface of the flexible tank is connected with the inner wall surface of the first telescopic frame; when the interior of the flexible tank is in an expansion state or a contraction state, the flexible tank drives the telescopic frame to do lifting motion in the direction perpendicular to the top of the base. The storage device can meet the requirements for gas / liquid storage with fluctuating capacity and skid-mounted installation of the flexible tank at the same time, and the effects of rapid arrangement, rapid transportation and rapid collection are achieved.

Description

Technical Field

[0001] This utility model relates to the field of gas / liquid storage technology, specifically to a large-capacity skid-mounted flexible storage device. Background Technology

[0002] Currently, metal tanks are generally used to store gas / liquid in the temporary storage of biomass biogas and in large-capacity skid-mounted storage of oil and natural gas. However, the use of metal tanks has the following disadvantages:

[0003] 1. The manufacturing cost is high due to the use of metal materials to manufacture the tank;

[0004] 2. During the transportation of metal cans, the number of metal cans that can be placed at the same time is small, which leads to increased transportation costs;

[0005] 3. When storing gas / liquid, production capacity may fluctuate due to natural conditions. The metal tanks used for storage need to be larger to prevent this, making it difficult to meet the requirements of both large volume and skid-mounted design.

[0006] To address the drawbacks of the aforementioned metal cans, a type of can that saves on transportation costs and storage space has emerged on the market: the flexible can. Due to its soft texture, the flexible can collapses and folds when not in use, significantly reducing the space it occupies and lowering transportation costs. However, when filling the flexible can with gas / liquid, because it lacks the rigidity of a metal can, it requires the use of a support frame. The erection of this frame necessitates external force, such as using a crane or forklift to lift the support structure around the flexible can before it can be deployed. This process not only increases the manpower and material resources required but also affects the efficiency of storing gas / liquid into the flexible can. Utility Model Content

[0007] This invention addresses the problem of simultaneously meeting the requirements for gas / liquid storage under fluctuating production capacity and the issue of skid-mounted installation in existing technologies. It provides a large-capacity skid-mounted flexible storage device that can simultaneously meet the requirements for gas / liquid storage under fluctuating production capacity and the skid-mounted installation of flexible tanks, achieving the effects of rapid deployment, rapid relocation, and rapid dismantling.

[0008] The technical solution adopted in this utility model is:

[0009] A high-capacity skid-mounted flexible storage device is provided, comprising:

[0010] The base has a flexible tank on top, with an inlet and an outlet on its side walls. A telescopic frame is located on top of the base, with the outer wall of the flexible tank connected to the inner wall of the telescopic frame. When the flexible tank is in an expanded or contracted state, it can drive the telescopic frame to move up and down in a direction perpendicular to the top of the base.

[0011] Optionally, the telescopic frame includes two telescopic frame units, which are stacked in a direction perpendicular to the top of the base, and the interior of each telescopic frame unit is connected to the outer wall of the flexible tank.

[0012] Optionally, the telescopic frame unit includes a first frame, a second frame, and a telescopic assembly, with the telescopic assembly positioned between the first and second frames. The telescopic assembly includes: a first fixed seat located at the top outer edge of the first frame, with a first adjusting rod hinged to the first fixed seat, and a first sliding rod hinged to the other end of the first adjusting rod; a first limiting block located at the top outer edge of the first frame, spaced apart from the first fixed seat, with a first limiting groove inside the first limiting block; a second fixed seat located at the bottom outer edge of the second frame, with a second adjusting rod hinged to the second fixed seat, and a second sliding rod hinged to the other end of the second adjusting rod; and a second limiting block located at the bottom outer edge of the second frame, spaced apart from the second fixed seat, with a second limiting groove inside the second limiting block; wherein the first sliding rod is slidably connected to the second limiting block via the second limiting groove, and the second sliding rod is slidably connected to the first limiting block via the first limiting groove; the first adjusting rod and the second adjusting rod are hinged together.

[0013] Optionally, a winch is also provided on the top of the base, with a connecting rope wound inside the winch. The other end of the connecting rope goes around the top of the telescopic frame and connects to the top of the base.

[0014] Optionally, the top of the telescopic frame is provided with multiple guide pulleys, and the winch's cable passes through the surfaces of multiple guide pulleys simultaneously.

[0015] Optionally, a booster pump is connected to the feed end of the flexible tank. The booster pump is located at the top of the base, and a motor for driving the booster pump is located at the top of the base, so that the booster pump pumps the material into the interior of the flexible tank through the feed end of the flexible tank.

[0016] Optionally, the flexible tank is equipped with a connected pressure regulating valve group at the discharge end for regulating the pressure inside the flexible tank.

[0017] Optionally, an electrical control cabinet is also provided on the top of the base, and an alarm is provided on the outer top of the electrical control cabinet to serve as a warning when the pressure inside the flexible tank is too high.

[0018] Optionally, a gas detector is provided on the top of the telescopic frame, with the detection end of the gas detector facing the flexible tank, for detecting whether the flexible tank is leaking gas.

[0019] Optionally, the top of the telescopic frame is also provided with multiple limit bars.

[0020] The beneficial effects of this utility model are:

[0021] 1. By using flexible tanks to store gas / liquid, it is possible to adapt to the situation where production capacity fluctuates due to natural conditions. That is, flexible tanks can adapt to the storage of gas / liquids that fluctuate in production capacity due to natural factors without increasing volume, occupying too much space, or increasing transportation costs.

[0022] 2. During gas / liquid storage, the flexible tank is transported to a suitable location using a transport base. The gas / liquid is then introduced into the flexible tank through its inlet. During this process, the flexible tank gradually expands due to the introduced gas / liquid. As the gas / liquid continues to flow in, the expanding flexible tank moves the telescopic frame attached to its outer wall, moving upwards perpendicular to the top of the base. The telescopic frame gradually unfolds as it moves upwards. Once the gas / liquid is fully contained within the flexible tank, the telescopic frame provides support and limits the tank, preventing it from tilting or collapsing. The tank is then transported to another location before the gas / liquid is discharged. When gas / liquid needs to be discharged from the flexible tank, the discharge end of the flexible tank is connected. At this time, the flexible tank will tend to shrink due to the discharge of gas / liquid. During the shrinkage process, the telescopic frame will move along with the flexible tank in a downward direction perpendicular to the top of the base, that is, the telescopic frame will also shrink. During the shrinkage process, the telescopic frame can continuously support and limit the flexible tank. The entire flexible tank is easy to operate and highly efficient in terms of deployment, transportation and dismantling, meeting the requirements of skid-mounted design, and can simultaneously meet the requirements of large capacity for gas / liquid storage and easy deployment, transportation and dismantling of skid-mounted design. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the large-capacity skid-mounted flexible storage device disclosed in this utility model.

[0025] Figure 2 for Figure 1 Front view structural diagram;

[0026] Figure 3 for Figure 1 A schematic diagram of the side view structure;

[0027] Figure 4 for Figure 1 A top-view structural diagram;

[0028] Figure 5 This is a three-dimensional structural diagram of the telescopic structural unit;

[0029] Figure 6 This is a schematic diagram of the hinge structure of the first and second adjusting rods;

[0030] Figure 7 for Figure 1 A magnified view of a portion of point A in the middle.

[0031] Figure label:

[0032] 1-Base, 10-Limiting frame;

[0033] 2-Flexible tank, 20-Infeed end, 201-Infeed pipe, 21-Outlet end, 210-Outlet pipe, 22-Drainage end, 220-Drainage pipe;

[0034] 3-Telescopic frame, 30-Telescopic frame unit, 31-Limiting rod, 301-First frame, 302-Second frame, 303-First fixed seat, 304-Second fixed seat, 305-First adjusting rod, 3050-First sliding rod, 306-Second adjusting rod, 3060-Second sliding rod, 307-First limiting block, 3070-First limiting groove, 308-Second limiting block, 3080-Second limiting groove;

[0035] 4-Winder, 40-Connecting rope, 41-Guide pulley;

[0036] 5 - Electrical control cabinet; 50 - Alarm device;

[0037] 6-Motor, 7-Booster pump, 8-Gas detector;

[0038] 9-Pressure regulating valve assembly, 90-Self-operated pressure regulating valve, 91-Pressure gauge, 92-Pressure sensor. Detailed Implementation

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0041] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0042] Example 1

[0043] Please see Figure 1-7 As shown, this embodiment discloses a large-capacity skid-mounted flexible storage device, including a base 1 and a flexible tank 2 disposed on the top of the base 1. The flexible tank 2 is specifically made of reinforced thermoplastic composite material, and both the inner and outer layers are made of corrosion-resistant and wear-resistant polyolefin material. Compared with the metal material used, it can achieve a weight reduction of about 30%, and the pressure bearing range is 1 to 2.5 MPa. In addition, the flexible tank 2 can effectively reduce the vibration and noise that occur during the loading of gas / liquid, and improve the environmental performance and user comfort of the base 1 and the flexible tank 2 in the overall use. In this embodiment, the top of the base 1 has a ring-shaped limiting frame 10 with a certain height. The limiting frame 10 surrounds the bottom part of the flexible can 2. When the flexible can 2 is not filled with gas / liquid, the flexible can 2 is like a deflated balloon piled up on the top of the base 1. The limiting frame 10 limits the flexible can 2 to prevent it from flowing to one side and shifting to the outside of the base 1, thereby causing damage to the flexible can 2 during transportation or use. Thus, the limiting frame 10 is used to limit and protect the flexible can 2 in a contracted state.

[0044] The flexible tank 2 is provided with an inlet end 20 and an outlet end 21 on the side wall of the tank body. The inlet end 20 is used to introduce gas / liquid into the interior of the flexible tank 2. Specifically, the inlet end 20 includes an inlet port opened on the side wall of the flexible tank 2 and an inlet pipe 201 connected to the inlet port, so that gas / liquid enters the interior of the flexible tank 2 through the inlet pipe 201 and the inlet port for filling. The outlet end 21 is used to discharge gas / liquid from the interior of the flexible tank 2. Specifically, the outlet end 21 includes an outlet port opened on the side wall of the flexible tank 2 and an outlet pipe 210 connected to the outlet port, so that the gas / liquid loaded in the flexible tank 2 can be discharged through the outlet port and the outlet pipe 210. In practical use, various connecting parts can be added to the feed pipe 201 at the feed end 20 to achieve better results. These include, but are not limited to, one-way valves, electric explosion-proof ball valves, and filters. One-way valves prevent backflow of gas / liquid within the flexible tank 2. Electric explosion-proof ball valves are suitable for flammable and explosive gases / liquids such as oil and natural gas, preventing safety accidents. Filters filter the gas / liquid, removing some impurities and preventing excessive impurities from entering the flexible tank 2. Furthermore, a drain end 22 can be installed on the outer wall of the tank. Specifically, the drain end 22 consists of a drain port on the outer wall of the tank and a drain pipe 220 connected to the drain port. A manual drain valve is installed on the drain pipe 220, allowing the discharge of accumulated waste from the flexible tank 2. It should be noted that because the material of the flexible tank 2 is more flexible than that of a metal tank, the feed pipe 201, discharge pipe 210, and drain pipe 220 connected to the flexible tank 2 need to be connected by a limiting frame 10. That is, the limiting frame 10 has three connecting holes, which correspond to the feed port, discharge port, and drain port respectively. The feed pipe 201 is connected to the feed port through one of the connecting holes, the discharge pipe 210 is connected to the discharge port through the second connecting hole, and the drain pipe 220 is connected to the drain port through the third connecting hole. The limiting frame 10 is used to fix and limit the feed pipe 201, discharge pipe 210, and drain pipe 220 to prevent them from moving around with the flexible tank 2 and causing air / material leakage.

[0045] A telescopic frame 3 is provided on the top of the base 1. The telescopic frame 3 can move up and down in a direction perpendicular to the top of the base 1. Specifically, the telescopic frame 3 is located on top of the limiting frame 10, and the flexible tank 2 is located inside the telescopic frame 3. The outer wall of the flexible tank 2 is connected to the inner wall of the telescopic frame 3. That is, during the filling expansion and degassing contraction process of the flexible tank 2, it can drive the telescopic frame 3 to move up and down. The telescopic frame 3 is mainly used to support and limit the flexible tank 2. The telescopic frame 3 disclosed in this embodiment includes two telescopic frame units 30. The two telescopic frame units 30 are arranged overlappingly in a direction perpendicular to the top of the base 1. For the entire telescopic frame 3 to be divided into two overlapping telescopic frame units 30, the two telescopic frame units 30 can provide more limiting and supporting parts for the tank wall of the flexible tank 2 during the filling and expansion process. This can prevent the flexible tank 2 from shaking during transportation due to the lack of support and limiting parts in the middle of the tank wall after filling. This is especially true for flexible tank 2 filled with liquid, which can easily lead to damage to the flexible tank 2.

[0046] Regarding the two telescopic frame units 30 described above, the lowermost telescopic frame unit 30 will be used for explanation. The telescopic frame unit 30 includes a first frame 301, a second frame 302, and a telescopic assembly. The first frame 301 is located at the top of the limiting frame 10, and its inner diameter is substantially the same as the inner diameter of the limiting frame 10. The second frame 302 is located at the top of the first frame 301, and the first frame 301 and the second frame 302 are connected by the telescopic assembly. That is, the second frame 302 can move up and down relative to the top of the first frame 301 via the telescopic assembly. Specifically, the telescopic assembly includes a first fixed seat 303, a first adjusting rod 305, a first sliding rod 3050, and a first limiting block 307 disposed on the end face of the first frame 301 facing the second frame 302, and also includes a second fixed seat 304, a second adjusting rod 306, a second sliding rod 3060, and a second limiting block 308 disposed on the end face of the second frame 302 facing the first frame 301. One end of the first adjusting rod 305 is hinged to the first fixed seat 303, allowing the first adjusting rod 305 to rotate about the hinge point between itself and the first fixed seat 303. A first sliding rod 3050 is hinged to the other end of the first adjusting rod 305. The first sliding rod 3050 is slidably connected to the second limiting block 308. Specifically, the sliding connection is achieved by creating a second limiting groove 3080 on the end face of the second limiting block 308 facing the first frame 301, allowing the first sliding rod 3050 to slidably connect to the second limiting block 308 located on the outer bottom of the second frame 302 via the second limiting groove 3080. Similarly, one end of the second adjusting rod 306 is hinged to the second fixed seat 304, and the other end of the second adjusting rod 306 is hinged to the second sliding rod 3060. The second sliding rod 3060 is slidably connected to the first limiting block 307 via the first limiting groove 3070 of the first limiting block 307. Thus, the first adjusting rod 305 and the second adjusting rod 306 form a cross-distributed structure. The first adjusting rod 305 and the second adjusting rod 306 are hinged to each other.In actual use, as the flexible tank 2 expands due to the filling of gas / liquid, the flexible tank 2 moves the second frame 302. This movement of the second frame 302, in turn, moves the second adjusting rod 306 via the second fixed seat 304. The second adjusting rod 306 rotates along its hinge point with the second fixed seat 304. During this rotation, the second adjusting rod 306 moves the second sliding rod 3060, which slides within the first limiting groove 3070 of the first limiting block 307. Furthermore, as the flexible tank 2 moves the second frame 302, the second limiting block 308 at the bottom of the second frame 302 also moves. With the second limiting block 308 moving, the length of the first adjusting rod 305 remains fixed, and one end of the first adjusting rod 305 is hinged to the first sliding rod 3050. The first sliding rod 3050 is slidably connected to the second limiting block 308 through the second limiting groove 3080, which achieves the effect of the second limiting block 308 driving the first adjusting rod 305 to rotate. At the same time, the second adjusting rod 306 will also drive the first adjusting rod 305 to rotate through the hinge with the first adjusting rod 305, thereby realizing the effect of unfolding the second frame 302 from the first frame 301 through the telescopic component and supporting and limiting the tank body of the flexible tank 2.

[0047] A winch 4 is also provided on the top of the base 1. A connecting rope 40 is wound inside the winch 4. The other end of the connecting rope 40 passes around the top of the telescopic frame 3 and connects to the top of the base 1 from the other side of the telescopic frame 3. That is, after the flexible tank 2 has finished filling and expanding, the winch 4 can press the telescopic frame 3 by winding the connecting rope 40, thereby limiting the flexible tank 2 and the telescopic frame 3 and preventing the flexible tank 2 from shifting during expansion and contraction. A guide pulley 41 is provided on the top of the telescopic frame 3 so that the connecting rope 40 changes direction after passing through the guide pulley 41. The guide pulley 41 can prevent the connecting rope 40 from being worn down due to repeated friction with the top of the telescopic frame 3 and thus prevent it from breaking. In addition, when the gas / liquid in the flexible tank 2 needs to be discharged, the winch 4 can press the telescopic frame 3 by winding the rope, which can assist the telescopic frame 3 in contracting and also help the flexible tank 2 discharge the gas / liquid inside.

[0048] Example 2

[0049] This embodiment is a further optimization based on Embodiment 1. Specifically, a motor 6, a booster pump 7, a pressure regulating valve assembly 9, and an electrical control cabinet 5 are also provided on the top of the base 1. The electrical control cabinet 5 contains a control module that can control the working status of the motor 6 and the pressure regulating valve assembly 9. The motor 6 controls the operation of the booster pump 7, which is connected to the feed end 20 of the flexible tank 2, i.e., the booster pump 7 is connected to the feed pipe 201. The negative pressure suction of the booster pump 7 pumps the material into the interior of the flexible tank 2 through the feed pipe 201. It is worth noting that the material here refers to gaseous / liquid material. The pressure regulating valve assembly 9 includes a self-operated pressure regulating valve 90 and a pressure gauge 91. The pressure regulating valve can automatically adjust the valve opening by sensing the pressure change of the measured medium, thereby maintaining the pressure before or after the valve within a preset range. The pressure gauge 91 can display the pressure inside the flexible tank 2 in real time. The pressure regulating valve is connected to the outlet of the flexible tank 2 through one of the through holes of the limiting frame 10, and the other end of the pressure regulating valve is connected to the discharge pipe 210. The pressure gauge 91 is located between the pressure regulating valve and the discharge pipe 210. When the pressure inside the flexible tank 2 becomes abnormal, the pressure gauge 91 indicates a change. A pressure sensor 92 is installed on the tank wall of the discharge pipe 210, and an alarm 50 is installed on the top of the electrical control cabinet 5. Both the pressure sensor 92 and the alarm 50 are electrically connected to the control module inside the electrical control cabinet 5. When the flexible tank 2 is filled with gas / liquid, according to the preset pressure value, after the pressure inside the flexible tank 2 reaches the preset value, the pressure sensor 92 transmits the signal to the control module inside the electrical control cabinet 5, causing the control module to stop the booster pump 7. After the flexible tank 2 is filled with gas / liquid, and during transportation, if the pressure value detected in the flexible tank 2 exceeds the standard, the pressure sensor 92 will transmit a signal to the electrical control cabinet 5, which will trigger the alarm 50 to sound, reminding the user to pay attention and adjust the pressure.

[0050] A gas detector 8 is installed at the top of the telescopic frame 3. The gas detector 8 is electrically connected to the control module in the electrical control cabinet 5. The gas detector 8 is an instrument for detecting gas concentration. The detection end of the gas detector 8 faces the flexible tank 2 to detect whether there is a natural gas leak in the flexible tank 2. Multiple limiting rods are installed at the top of the telescopic frame 3. Specifically, the multiple limiting rods are installed on the inner wall of the second frame 302 at the top. The multiple limiting rods can limit the top of the flexible tank 2 within the telescopic frame 3. That is, during the expansion process, the top of the flexible tank 2 will be held in place by the limiting rods. In addition, the flexible tank 2 holding the limiting rods can better drive the telescopic frame 3 to extend and retract. In this embodiment, the gas detector 8 is installed at the top of one of the limiting rods, and the detection end of the gas detector 8 faces the flexible tank 2 to detect gas.

[0051] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large-capacity skid-mounted flexible storage device, characterized in that, include: The base has a flexible tank on its top, and the side wall of the flexible tank has an inlet end and an outlet end respectively; A telescopic frame is disposed on top of the base, and the outer wall of the flexible tank is connected to the inner wall of the telescopic frame. When the interior of the flexible tank is in an expanded or contracted state, the flexible tank can drive the telescopic frame to move up and down in a direction perpendicular to the top of the base.

2. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, The telescopic frame includes at least two telescopic frame units, which are arranged overlappingly along the top direction perpendicular to the base, and the interior of each of the two telescopic frame units is connected to the outer wall of the flexible tank.

3. The large-capacity skid-mounted flexible storage device according to claim 2, characterized in that, Each of the telescopic frame units includes a first frame, a second frame, and a telescopic component, wherein the telescopic component is disposed between the first frame and the second frame.

4. The large-capacity skid-mounted flexible storage device according to claim 3, characterized in that, The telescopic component includes: A first fixed seat is located on the outer top of the first frame. The first fixed seat is hinged to a first adjusting rod, and the other end of the first adjusting rod is hinged to a first sliding rod. The first limiting block is located on the outer top of the first frame and is spaced apart from the first fixed seat. The first limiting block has a first limiting groove inside. The second fixing seat is located at the outer bottom of the second frame. The second fixing seat is hinged to the second adjusting rod, and the other end of the second adjusting rod is hinged to the second sliding rod. The second limiting block is located at the outer bottom of the second frame and is spaced apart from the second fixed seat. The second limiting block has a second limiting groove inside. The first slide rod is slidably connected to the second limiting block through the second limiting groove, and the second slide rod is slidably connected to the first limiting block through the first limiting groove; the first adjusting rod and the second adjusting rod are hinged together.

5. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, The base is also equipped with a winch at the top, and a connecting rope is wound inside the winch. The other end of the connecting rope goes around the top of the telescopic frame and connects to the top of the base.

6. The large-capacity skid-mounted flexible storage device according to claim 5, characterized in that, The top of the telescopic frame is provided with multiple guide pulleys, and the connecting rope of the winch passes through the surfaces of multiple guide pulleys simultaneously.

7. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, The flexible tank is equipped with a pressure regulating valve group at the discharge end for regulating the pressure inside the flexible tank.

8. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, The base is also equipped with an electrical control cabinet on top, and an alarm is installed on the outer top of the electrical control cabinet to serve as a warning when the pressure inside the flexible tank is too high.

9. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, A gas detector is installed at the top of the telescopic frame, with the detection end of the gas detector facing the flexible tank, for detecting whether the flexible tank is leaking gas.

10. The large-capacity skid-mounted flexible storage device according to claim 1, characterized in that, The top of the telescopic frame is also equipped with multiple limiting rods.

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