Thin-walled butterfly tank liner and winding process thereof

Abstract

This application discloses a thin-walled butterfly-shaped tank liner and its winding process, belonging to the field of tank technology. The winding process of the composite material for the thin-walled butterfly-shaped tank liner uses a butterfly-shaped tank tooling, including embedding multiple pressure sensors in the thin-walled butterfly-shaped tank liner; the butterfly-shaped tank tooling clamps the thin-walled butterfly-shaped tank liner, and a pressure mechanism applies pressure to the interior of the thin-walled butterfly-shaped tank liner; the composite material is wound onto the thin-walled butterfly-shaped tank liner, and the pressure mechanism is controlled to adjust the pressure to the interior of the thin-walled butterfly-shaped tank liner according to the maximum pressure value among the pressures at different winding positions at any same time or during any same period in the winding process, so as to maintain a first dynamic balance between the external pressure exerted by the composite material on the thin-walled butterfly-shaped tank liner at at least part or the entire winding process and the internal pressure on the thin-walled butterfly-shaped tank liner; avoiding deformation or local stress concentration.

Description

Technical Field

[0001] This application belongs to the field of storage tank technology, specifically relating to a thin-walled butterfly-shaped storage tank liner and its winding process. Background Technology

[0002] A butterfly-shaped storage tank is a hollow storage device. During the production of a butterfly-shaped storage tank, carbon fiber bundles are wound around the outer side of the inner lining of the tank. A fiber preform structure is prepared through two-dimensional winding, and then thermosetting is used to form the storage tank.

[0003] Because the liner of a butterfly-shaped storage tank is a thin-walled structure, the traditional process of winding carbon fiber bundles can cause deformation of the liner due to the tension exerted by the composite material on it. This prevents further winding and the deformed liner does not meet the requirements for processing, severely impacting subsequent production. Furthermore, during the winding of the composite material on the outer side of the liner, variations in winding angle, speed, time, and the liner's thickness and shape can lead to localized deformation, resulting in micro-defects or localized stress concentrations. This makes it impossible to ensure a dynamic balance between the internal pressure of the liner and the external pressure exerted by the composite material, to maintain a good fit between the liner and the composite material, and to ensure that the composite material maintains balanced pressure with the liner at every winding point. Furthermore, during the thermosetting process, the change in the shrinkage strength of the carbon fiber applies external pressure to the already wound butterfly tank for the second time, which will further cause the container to become unstable and cause the butterfly tank to be damaged by pressure for the second time. Summary of the Invention

[0004] This application provides a thin-walled butterfly tank liner and its winding process to solve the above-mentioned technical problems that the winding composite material stage cannot ensure the dynamic balance between the internal pressure on the thin-walled butterfly tank liner and the external pressure applied by the composite material to the thin-walled butterfly tank liner; and that the high-temperature curing of the thin-walled butterfly tank liner after winding the composite material cannot ensure the dynamic balance between the internal pressure on the thin-walled butterfly tank liner and the external pressure applied by the composite material to the thin-walled butterfly tank liner.

[0005] The thickness of thin-walled butterfly tank liners is trending towards decreasing, with future alloy-material thin-walled butterfly tank liner thicknesses becoming even smaller to meet lightweight requirements. However, during the composite material winding process, the pressure exerted on the thin-walled butterfly tank liner by the composite material, as well as the increased pressure due to the shrinkage of the composite material during the high-temperature curing stage, can cause localized micro-deformation. This micro-deformation can further lead to localized defects within the thin-walled butterfly tank, especially during later use, making these defects vulnerable points and affecting the liner's service life. Therefore, the process method described in this application addresses the issue of micro-deformation, ensuring the thin-walled butterfly tank liner maintains dynamic equilibrium throughout the winding and curing processes, thereby strengthening the liner and extending its service life.

[0006] The technical solution adopted in this application is as follows:

[0007] A composite material winding process for a thin-walled butterfly-shaped storage tank liner, using a butterfly-shaped storage tank fixture, includes the following steps:

[0008] S1: Multiple pressure sensors are placed on the inner lining of the thin-walled butterfly tank along the winding path of the composite material;

[0009] S2: The butterfly-shaped storage tank fixture clamps the thin-walled butterfly-shaped storage tank liner and applies pressure to the interior of the thin-walled butterfly-shaped storage tank liner through the pressure mechanism of the butterfly-shaped storage tank fixture;

[0010] S3: The composite material is wound onto the outer circumference of the thin-walled butterfly tank liner according to a preset winding path. The pressure at different winding positions of the thin-walled butterfly tank liner is obtained in real time by a pressure sensor. The pressure mechanism is controlled to adjust the pressure inside the thin-walled butterfly tank liner according to the maximum pressure value among the pressures at different winding positions at any same time or at any same time period during the winding process. This is to maintain a first dynamic balance between the external pressure exerted by the composite material on the thin-walled butterfly tank liner at at least part or the entire winding process and the internal pressure on the thin-walled butterfly tank liner.

[0011] S4: When the thin-walled butterfly tank liner with the composite material and the butterfly tank tooling are cured together according to the curing procedure, at least during the high-temperature curing section or the entire curing procedure, the pressure sensor acquires the pressure at different winding positions of the thin-walled butterfly tank liner in real time, and controls the pressure mechanism to adjust the pressure inside the thin-walled butterfly tank liner in real time according to the maximum pressure value at different winding positions at any same time or at any same time period in the curing procedure, so that the external pressure applied by the composite material to the thin-walled butterfly tank liner at different winding positions and the internal pressure on the thin-walled butterfly tank liner are maintained in a second dynamic balance.

[0012] The composite material winding process for the thin-walled butterfly-shaped tank liner of this application also has the following additional technical features:

[0013] In step S1, the winding path is a spiral winding along the inner lining of the thin-walled butterfly-shaped storage tank; or,

[0014] The winding path is as follows: circumferential winding at a preset winding angle along the first end section of the butterfly-shaped storage tank, transitioning to longitudinal spiral winding at a preset winding angle along the second end section; or...

[0015] The winding path is a longitudinal spiral winding at a preset winding angle along the first end section of the butterfly-shaped storage tank, transitioning to a circumferential winding at a preset winding angle along the second end section.

[0016] When the composite material is wound around the outside of the thin-walled butterfly tank liner along the winding path, an S-shaped winding is used at the position of the flange on the surface of the thin-walled butterfly tank liner.

[0017] It also includes step S5: discharging the gas inside the cured thin-walled butterfly tank liner to the outside through the exhaust port of the butterfly tank tooling.

[0018] This application also relates to a thin-walled butterfly-shaped storage tank liner, characterized in that it includes a liner body; a plurality of pressure sensors are arranged at intervals along the winding path on the outer arc surface of the liner body; a material inlet is provided on the liner body; and the pressure sensors are also arranged at the material inlet of the thin-walled butterfly-shaped storage tank liner.

[0019] The inner liner body has mounting slots for embedding the pressure sensor, and the mounting slots are spaced apart along the winding path.

[0020] This application also relates to a butterfly-shaped storage tank fixture, which includes a first clamping mechanism and a second clamping mechanism for clamping a thin-walled butterfly-shaped storage tank liner; a first end of the first clamping mechanism has a gas channel communicating with the thin-walled butterfly-shaped storage tank liner, and a pressure mechanism pressurizes the interior of the thin-walled butterfly-shaped storage tank liner through the gas channel. The first end of the first clamping mechanism can be inserted into and block the material inlet.

[0021] The first clamping mechanism includes a first clamping rod, a first clamping plate, and a connecting pipe connected sequentially along the clamping direction; the connecting pipe is inserted into the material inlet of the thin-walled butterfly-shaped storage tank liner, the first clamping plate corresponds to the outer surface of the thin-walled butterfly-shaped storage tank liner to block the material inlet, and the first clamping rod is connected to the pressure mechanism.

[0022] The first clamping rod has an air passage inside, and the first clamping plate has a flow hole inside. The air passage, the flow hole, and the interior of the connecting pipe are connected to form a gas channel.

[0023] The butterfly-shaped storage tank fixture also includes a pressure mechanism, which includes an air pump and a pressure detection element for detecting the air pump pressure; the air pump is connected to the gas channel through an air pipe.

[0024] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0025] 1. A composite material winding process for a thin-walled butterfly tank liner, employing a butterfly tank fixture. The butterfly tank fixture and pressure mechanism can apply pressure to the interior of the thin-walled butterfly tank liner, achieving a dynamic balance between the pressure exerted by the pressure mechanism on different winding positions within the thin-walled butterfly tank liner at any given moment or time interval during the winding process, and the external pressure exerted on the thin-walled butterfly tank liner by the tension of the externally wound composite material. To achieve real-time monitoring of pressure at different locations, multiple pressure sensors are installed on the thin-walled butterfly tank liner, embedded along the winding path of the composite material into the thin-walled butterfly tank liner, ensuring that the pressure sensors are in contact with the composite material wound outside the thin-walled butterfly tank liner. By using pressure sensors installed along the winding path, the internal pressure of the thin-walled butterfly tank liner is detected in real time. The controller controls the amount of gas delivered to the thin-walled butterfly tank liner through the butterfly tank tooling, thereby adjusting the internal pressure of the thin-walled butterfly tank liner. This ensures that the internal and external pressures of the thin-walled butterfly tank liner remain dynamically balanced at any given moment or time during the winding process, preventing deformation or localized stress concentration in the thin-walled butterfly tank liner during the winding or curing process of the composite material.

[0026] 2. In a preferred embodiment of this application, the butterfly-shaped storage tank tooling includes a first clamping mechanism and a second clamping mechanism for clamping the thin-walled butterfly-shaped storage tank liner; the first end of the first clamping mechanism has a gas channel communicating with the thin-walled butterfly-shaped storage tank liner, and the pressure mechanism pressurizes the interior of the thin-walled butterfly-shaped storage tank liner through the gas channel. After the first clamping mechanism and the second clamping mechanism clamp the thin-walled butterfly-shaped storage tank liner, the pressure mechanism pumps gas through the gas channel of the first clamping mechanism into the interior of the thin-walled butterfly-shaped storage tank liner. The pressure sensor detects the internal and external pressure difference in real time, and the controller controls the amount of gas pumped into the interior of the thin-walled butterfly-shaped storage tank liner by controlling the amount of gas pumped by the pressure mechanism to adjust the internal and external pressure difference in real time, so that the pressure difference value remains stable, and achieves dynamic balance between the internal and external pressures of the thin-walled butterfly-shaped storage tank liner at any same moment or at any same time period during the winding process.

[0027] 3. In a preferred embodiment of this application, the first end of the first clamping mechanism can be inserted into and block the material inlet. The first end can block the material inlet to prevent gas from leaking between the first section and the thin-walled butterfly tank liner, and can also allow gas to enter the gas channel in the first end of the first clamping mechanism through the pressure mechanism, and then enter the interior of the thin-walled butterfly tank liner through the gas channel, thereby regulating the internal air pressure of the thin-walled butterfly tank liner.

[0028] 4. In a preferred embodiment of this application, the thin-walled butterfly-shaped storage tank liner is placed in a curing oven and cured according to a curing procedure. The gas inside the cured thin-walled butterfly-shaped storage tank liner is then discharged to the outside through the vent of the butterfly-shaped storage tank fixture. Since the interior of the thin-walled butterfly-shaped storage tank liner is used to hold gases for special industrial applications, it is necessary to remove excess gas from the liner. Furthermore, after the thin-walled butterfly tank liner has cured, the butterfly tank fixture needs to be removed from the liner according to the process flow. Since the butterfly tank fixture applies internal force to the liner, when the fixture is removed, the material inlet on the liner is suddenly opened, and the gas inside the liner is rapidly ejected outward, creating a thrust on the outside air. Because forces are reciprocal, the outside air exerts a reaction force on the liner, which can easily cause it to fly out. Therefore, the remaining gas inside the liner needs to be discharged before removing the fixture.

[0029] 5. In a preferred embodiment of this application, the butterfly-shaped storage tank tooling further includes a pressure mechanism, which includes an air pump and a pressure detection element for detecting the air pump pressure; the air pump is connected to the gas channel via an air pipe. By pressurizing the interior of the butterfly-shaped storage tank liner through the pressure mechanism, the internal pressure at different winding positions of the butterfly-shaped storage tank liner during the winding process is equal to the external pressure exerted on the butterfly-shaped storage tank liner by the composite material at that location, achieving dynamic pressure balance at any equal moment or during any equal period of the winding process; similarly, dynamic pressure balance is maintained throughout the entire curing process, thereby ensuring that the butterfly-shaped storage tank liner is always in a stable pressure state without imbalance or deformation. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the assembly of the thin-walled butterfly tank liner and the butterfly tank tooling under one embodiment of the composite material winding process for the thin-walled butterfly tank liner of this application.

[0032] Figure 2 for Figure 1 Cross-sectional view;

[0033] Figure 3 This is a schematic diagram of the first clamping mechanism of the butterfly tank tooling under one embodiment of the composite material winding process for the inner lining of a thin-walled butterfly tank according to this application.

[0034] In the picture,

[0035] 1. Thin-walled butterfly-shaped storage tank lining;

[0036] 2. Butterfly-shaped storage tank fixture, 21. First clamping mechanism, 211. First clamping rod, 212. First clamping plate, 2121. Plate body, 2122. Connector, 213. Connecting pipe, 22. Second clamping mechanism, 221. Second clamping rod, 222. Second clamping plate;

[0037] 3. Pressure sensors;

[0038] 4. Pressure mechanism; 41. Air pump; 42. Pressure detection element;

[0039] 5 Composite material, 6 Gas passage, 7 Flange, 8 Exhaust channel, 9 Exhaust hole, 10 Sealing nut, 11 Material port, 12 Sealing gasket, 13 Mounting groove, 14 First gasket, 15 Second gasket, 16 Connection hole. Detailed Implementation

[0040] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0042] Furthermore, it should be understood that in the description of this application, the terms "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not 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 the present invention. In addition, in this application, terms such as pressure and pressure difference can be replaced with pressure intensity, pressure difference, etc., as understood by those skilled in the art.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0045] This application relates to a composite material winding process for a thin-walled butterfly-shaped tank liner, using a butterfly-shaped tank tooling, and the winding process includes the following steps:

[0046] S1: Multiple pressure sensors are placed on the inner lining of the thin-walled butterfly tank along the winding path of the composite material;

[0047] S2: The butterfly-shaped storage tank fixture clamps the thin-walled butterfly-shaped storage tank liner and applies pressure to the interior of the thin-walled butterfly-shaped storage tank liner through the pressure mechanism of the butterfly-shaped storage tank fixture;

[0048] S3: The composite material is wound onto the outer circumference of the thin-walled butterfly tank liner according to a preset winding path. The pressure at different winding positions of the thin-walled butterfly tank liner is obtained in real time by a pressure sensor. The pressure mechanism is controlled to adjust the pressure inside the thin-walled butterfly tank liner according to the maximum pressure value among the pressures at different winding positions at any same time or at any same time period during the winding process. This is to maintain a first dynamic balance between the external pressure exerted by the composite material on the thin-walled butterfly tank liner at at least part or the entire winding process and the internal pressure on the thin-walled butterfly tank liner.

[0049] S4: When the thin-walled butterfly tank liner with the composite material and the butterfly tank tooling are cured together according to the curing procedure, at least during the high-temperature curing section or the entire curing procedure, the pressure sensor acquires the pressure at different winding positions of the thin-walled butterfly tank liner in real time, and controls the pressure mechanism to adjust the pressure inside the thin-walled butterfly tank liner in real time according to the maximum pressure value at different winding positions at any same time or at any same time period in the curing procedure, so that the external pressure applied by the composite material to the thin-walled butterfly tank liner at different winding positions and the internal pressure on the thin-walled butterfly tank liner are maintained in a second dynamic balance.

[0050] Before winding the composite material, the purpose of the pressure sensor is to acquire the pressure on the thin-walled butterfly tank liner at different winding positions in real time. Because the thin-walled butterfly tank liner has a similar elliptical structure, the pressure at different positions varies due to differences in winding angle, winding speed, and winding direction. Throughout the dynamic winding process, the pressure on the thin-walled butterfly tank liner is constantly changing in real time. This application addresses how to acquire the pressure on the thin-walled butterfly tank liner at different winding positions at any given moment or time interval during the winding process. The internal pressure and the external pressure exerted by the wound composite material on the thin-walled butterfly tank liner maintain a dynamic balance. Therefore, by setting multiple pressure sensors to detect the pressure value on the thin-walled butterfly tank liner at different locations in real time, the pressure mechanism in the butterfly tank tooling is further controlled to pump gas into the interior of the thin-walled butterfly tank liner in real time based on the obtained pressure value. This ensures that the internal and external pressures of the thin-walled butterfly tank liner are always in a stable pressure state and will not become unbalanced or even deformed.

[0051] It is worth noting that the internal pressure in the thin-walled butterfly tank liner is evenly distributed. Due to the different winding angles, winding times and winding directions of the composite material at different locations, the external forces on different locations outside the thin-walled butterfly tank liner are different. Therefore, in order to ensure that the thin-walled butterfly tank liner will not be affected by imbalance or even deformation under the action of maximum external force, it is necessary to determine the required inflation volume by comparing the maximum pressure value obtained by the pressure sensor and then control the pressure mechanism to pressurize the gas pumped into the interior of the thin-walled butterfly tank liner.

[0052] In step S1, there are various ways to arrange multiple pressure sensors on the thin-walled butterfly tank liner along the winding path of the composite material. For example, as a preferred embodiment, multiple pressure sensors can be attached to the outer surface of the thin-walled butterfly tank liner along the winding path.

[0053] As another implementation, multiple pressure sensors can be embedded in or attached to the outer circumferential surface of the thin-walled butterfly tank liner. When the pressure sensors are embedded in the thin-walled butterfly tank liner, micro-recessed mounting grooves can be formed on the outer surface of the liner, allowing the pressure sensors to be supported on the liner and in contact with the composite material for detecting the pressure applied to the composite material. It is worth noting that the micro-recessed mounting grooves should not affect the strength of the thin-walled butterfly tank liner to avoid it being unable to withstand high pressure. The pressure impact on the liner should be minimized to avoid deformation or defects during winding, curing, and subsequent use.

[0054] As a third implementation, multiple pressure sensors can be installed in the adhesive layer, which is located between the composite material and the thin-walled butterfly tank liner, so that the composite material can be in contact to detect the pressure exerted by the composite material on the thin-walled butterfly tank liner.

[0055] Composite materials possess excellent characteristics such as high strength, high modulus, high stiffness, excellent vibration damping, fatigue resistance, and corrosion resistance. The composite materials mentioned in this application can be single or mixed fibers with a thermosetting resin bonded to their surface. The single fibers with the thermosetting resin bonded to their surface are flowable at room temperature. Since the surface of the fiber bundle is impregnated with thermosetting resin, the surface of the fiber bundle is viscous and flowable. After winding and curing, the state changes to a solid structure due to high-temperature curing. Mixed fibers can be, but are not limited to, the following: carbon fiber, PBO fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber, etc.

[0056] In step S3, the pressure values ​​at different winding positions at any identical moment or at any identical time period during the winding process (where "any identical moment" can refer to a transient moment, such as the third second) can be obtained by measuring the pressure values ​​at the winding position using three pressure sensors. The pressure values ​​among these three sensors are compared, and the largest pressure value is selected. Based on this largest pressure value, the pressure mechanism is controlled to adjust the pressure inside the thin-walled butterfly tank liner, thereby achieving pressure balance between the inside and outside of the thin-walled butterfly tank liner at any identical moment or at any identical time period during the winding process. "Any identical time period" can be a time interval of several seconds, for example, by measuring the pressure value at the thin-walled butterfly tank liner within three seconds using, for example, three pressure sensors. The specific measurement method is similar to that described above and will not be elaborated further.

[0057] The pressure mechanism controls the pressure adjustment of the interior of the thin-walled butterfly tank liner by controlling the maximum pressure value among the pressures it receives. The pressure adjustment process may involve not only pressurization but also depressurization. This is because the thin-walled butterfly tank liner has a base pressure in the early stage of winding, but as the temperature rises, the internal gas pressure will also change. The contribution of this change to the pressure of the thin-walled butterfly tank liner is uncertain. Therefore, it may be slightly higher than the external pressure, so depressurization may be necessary. Thus, it is necessary to adaptively adjust the internal and external pressures of the thin-walled butterfly tank liner according to the measured pressure value.

[0058] A first dynamic balance is maintained between the external pressure exerted by the composite material on the thin-walled butterfly tank liner at different winding positions during at least part or the entire winding process and the internal pressure experienced by the thin-walled butterfly tank liner. This balance can be achieved by detecting pressure at least partially in areas where curvature changes during winding, or by detecting pressure just before winding is completed, as the final stage of winding is when the entire thin-walled butterfly tank liner experiences the greatest external force. Specifically, the balance can be achieved at least certain times during the entire winding process, without being limited by this embodiment. Alternatively, the first dynamic balance can be achieved by real-time detection of the internal and external pressure values ​​of the thin-walled butterfly tank liner throughout the entire winding process.

[0059] The first dynamic equilibrium can be set within a pressure range where the internal and external pressure difference on the thin-walled butterfly tank liner is not enough to cause microscopic defects (e.g., micron-level cracks) to the liner and / or composite material at room temperature or before curing; or even set to less than 0.30-0.85 times the aforementioned pressure range, thereby reserving sufficient safety threshold.

[0060] In step S4, when the thin-walled butterfly tank liner and the butterfly tank tooling with the composite material wound together are cured according to the curing procedure, the thin-walled butterfly tank liner and the butterfly tank tooling with the composite material wound together can be placed in a curing oven for curing. The curing process may include a heating phase, a high-temperature curing phase, a heat preservation phase, or a cooling phase. During the curing process, the pressure of the thin-walled butterfly tank liner is adjusted at least during the high-temperature curing phase throughout the entire curing period. At any given moment, such as a certain second, or at any given time period, such as within a few seconds; for example, at the third second, pressure is detected at different winding positions of the thin-walled butterfly tank liner using three pressure sensors to obtain the maximum pressure value among the three pressure values. The pressure of the thin-walled butterfly tank liner is adjusted according to this maximum pressure value. The pressure adjustment can be either increasing or decreasing the pressure. The purpose is to ensure that the external pressure applied to the thin-walled butterfly tank liner by the composite material at any given moment or at different winding positions during the winding process is in a second dynamic balance with the internal pressure experienced by the thin-walled butterfly tank liner.

[0061] When the thin-walled butterfly-shaped tank liner made of wound composite material and the butterfly-shaped tank tooling are placed together in a curing oven for curing according to the curing procedure, the composite material shrinks due to the high temperature, putting pressure on the thin-walled butterfly-shaped tank liner. This increases the external pressure on the thin-walled butterfly-shaped tank liner. Due to differences in winding angle, winding direction, and fiber thickness, the shrinkage intensity of the composite material 5 varies during the curing process, resulting in different external pressures at different locations of the thin-walled butterfly-shaped tank liner 1. This can lead to deformation or localized stress concentration, causing defects. Therefore, during the curing stage, the pressure of the thin-walled butterfly-shaped tank liner at different winding positions is acquired in real time using pressure sensors. Based on the highest pressure value measured in real time, the air pressure pumped into the interior of the thin-walled butterfly-shaped tank liner by the pressure mechanism is controlled in real time, so that the pressure between the interior and exterior of the thin-walled butterfly-shaped tank liner remains in a second dynamic balance at any given moment or time during the winding process.

[0062] The second dynamic equilibrium can be set within the pressure range during the curing process such that the internal and external pressure difference experienced by the thin-walled butterfly tank liner does not cause microscopic defects (e.g., micron-level cracks) to the liner and / or composite material; or even set to less than 0.25-0.75 times the aforementioned pressure range, thereby reserving sufficient safety threshold.

[0063] Achieving a second dynamic steady-state equilibrium helps to create a dynamic stress-strain balance between the liner and the composite material at the microscopic level, and significantly reduces the occurrence of micro-defects or local stress concentrations during the winding and / or curing processes. This results in a butterfly-shaped gas cylinder with good overall stress performance, improves the fit between the liner and the carbon fiber composite layer, and enhances its long-term service life.

[0064] In a preferred embodiment, in step S2, the winding path can be selected from any of the following embodiments:

[0065] In one preferred embodiment, the winding path is a spiral winding along the inner lining 1 of the thin-walled butterfly-shaped storage tank;

[0066] In another preferred embodiment, the winding path is a circumferential winding along the first end section of the butterfly-shaped tank at a preset winding angle, transitioning to a longitudinal spiral winding at a preset winding angle along the second end section; the thin-walled butterfly-shaped tank liner 1 can be an integral structure; it can also be a three-section connected structure, wherein the thin-walled butterfly-shaped tank liner 1 includes a first end section, a cylinder section, and a second end section connected in sequence; in this embodiment, as... Figure 1 As shown, the thin-walled butterfly-shaped tank liner 1 includes a first end cap section, a cylindrical section, and a second end cap section connected sequentially from top to bottom; the first end cap section and the second end cap section are configured as a structure symmetrical about the cylindrical section as the center, and the composite material 5 passes through the first end cap section and is wound circumferentially through the cylindrical section at a preset angle, then transitions to the position of the second end cap section and is wound in a longitudinal spiral manner.

[0067] In another preferred embodiment, the winding path involves longitudinal spiral winding at a preset winding angle along the first end section of the butterfly-shaped storage tank, transitioning to circumferential winding at a preset winding angle along the second end section. In this embodiment, a method similar to... Figure 1 The winding method shown is the opposite of the method, that is, the first end cap section is longitudinally spirally wound at a preset winding angle through the cylinder section, and then the second end cap section is circumferentially wound at a preset winding angle.

[0068] The preset angle required for winding needs to be adjusted according to actual needs. The design of the winding angle of the traditional unequal-hole butterfly storage box can be based on the fact that the geometric parameters of the winding product have been determined. The winding ability of the unequal-hole considers the friction coefficient and the length of the cylinder, and finally achieves a fiber winding trajectory with a continuous change in winding angle and a stable yarn drop point trajectory.

[0069] When the composite material 5 is wound around the outside of the thin-walled butterfly tank liner 1 along the winding path, an S-shaped winding is performed on the surface of the thin-walled butterfly tank liner 1 at the position corresponding to the flange 7. The purpose of performing the S-shaped winding at the flange 7 is to form a reinforcing layer.

[0070] The winding process of the composite material 5 of the thin-walled butterfly tank liner 1 also includes step S5: the curing oven discharges the gas inside the cured thin-walled butterfly tank liner 1 to the outside through the exhaust port 9 of the butterfly tank tooling 2.

[0071] After curing, the sealing nut 10 is opened, and the vent hole 9 is connected to the outside. Then, the gas inside the thin-walled butterfly tank liner 1 enters the vent channel 8 through the gas channel 6, and the gas is discharged to the outside after passing through the vent hole 9 along the vent channel 8.

[0072] After the thin-walled butterfly-shaped storage tank liner has cured, the butterfly-shaped storage tank fixture needs to be removed from the liner according to the process flow. Because the butterfly-shaped storage tank fixture applies internal force to the liner, when the fixture is removed, the material inlet on the liner is suddenly opened, and the gas inside the liner is rapidly ejected outward, creating a thrust on the outside air. Since forces are reciprocal, the outside air exerts a reaction force on the liner, which can easily cause it to fly out. Therefore, the remaining gas inside the liner needs to be discharged before removing the fixture.

[0073] This application also relates to a butterfly-shaped storage tank fixture 2, which includes a first clamping mechanism 21 and a second clamping mechanism 22 for clamping a thin-walled butterfly-shaped storage tank liner 1; the first end of the first clamping mechanism 21 has a gas channel 6 communicating with the thin-walled butterfly-shaped storage tank liner 1, and the pressure mechanism 4 pressurizes the interior of the thin-walled butterfly-shaped storage tank liner 1 through the gas channel 6; the first end of the first clamping mechanism 21 can be inserted into and block the material port 11 described below.

[0074] The thin-walled butterfly-shaped storage tank liner 1 has a material inlet 11; the pressure sensor 3 is also installed at the material inlet 11 of the thin-walled butterfly-shaped storage tank liner 1. A sealing gasket 12 is provided on the outside of the material inlet 11. The sealing gasket 12 is located between the first clamping plate 212 and the material inlet 11. The sealing gasket 12 is sleeved on the outside of the material inlet 11 to enhance the sealing between the material inlet 11 and the first clamping plate 212 and prevent gas from leaking from between the material inlet 11 and the first clamping plate 212.

[0075] The connecting pipe 213 of the first clamping mechanism 21 is inserted into the material port 11. The first clamping plate 212 of the first clamping mechanism 21 abuts against the outer wall of the thin-walled butterfly-shaped storage tank liner 1 to seal the material port 11. The first clamping rod 211 of the first clamping mechanism 21 is located on the outside of the thin-walled butterfly-shaped storage tank liner 1 and is connected to the pressure mechanism 4. The first base supports the first clamping rod 211, the first clamping plate 212 and the connecting pipe 213.

[0076] By setting the material inlet 11 as described below, the first clamping mechanism 21 is connected to the thin-walled butterfly tank liner 1, and the gas channel 6 is connected to the thin-walled butterfly tank liner 1. The pressure mechanism 4 can directly pump the gas into the interior of the butterfly tank through the gas channel 6.

[0077] The first clamping mechanism 21 includes a first clamping rod 211, a first clamping plate 212, and a connecting pipe 213 connected sequentially along the clamping direction. One end of the first clamping rod 211 is connected to one end of the first clamping plate 212, and the connecting pipe 213 is connected to the other end of the first clamping plate 212. An air passage is provided on the side of the first clamping rod 211 facing the connecting pipe 213. A flow hole is opened inside the first clamping plate 212, and the flow hole passes through the first clamping plate 212. The connecting pipe 213 is a hollow tubular structure. The air passage, the flow hole, and the interior of the connecting pipe 213 communicate to form a gas channel 6. In use, the connecting pipe 213 is inserted into the material inlet 11 of the thin-walled butterfly-shaped storage tank liner 1, as described below, and the first clamping plate 212 is in contact with the outer surface of the thin-walled butterfly-shaped storage tank liner 1. The pressure mechanism 4 is connected to the gas channel 6 of the first clamping rod 211. Gas enters the interior of the thin-walled butterfly tank liner 1 after passing through the gas channel 6 and the connecting pipe 213, so that the pressure mechanism pumps gas into the interior of the thin-walled butterfly tank liner 1.

[0078] The first clamping rod 211 is also supported on a horizontal surface such as the ground or a workbench by the first base.

[0079] The side of the first clamping plate 212 connected to the first clamping rod 211 is perpendicular to the extension direction of the first clamping plate 212. The side of the first clamping plate 212 away from the first clamping rod 211 has an arc-shaped groove. The arc surface of the arc-shaped groove is adapted to the shape of the outer arc surface of the thin-walled butterfly-shaped storage tank liner 1 so as to attach the first clamping plate 212 to the outer surface of the thin-walled butterfly-shaped storage tank liner 1.

[0080] The second clamping mechanism 22 includes a second clamping rod 221 and a second clamping plate 222 connected sequentially along the clamping direction. The second clamping rod 221 is supported on a horizontal surface such as the ground or a workbench by a second base. The first clamping plate 212 and the second clamping plate 222 have the same structure, and the first clamping plate 212 and the second clamping plate 222 symmetrically clamp the outer peripheral surface of the thin-walled butterfly-shaped storage tank liner 1.

[0081] The connection method between the first clamping rod 211 and the first clamping plate 212 is not limited to this embodiment, and any of the following methods can be used:

[0082] Implementation method 1: The first clamping rod 211 and the first clamping plate 212 are fixedly connected as an integrated structure. An air passage is opened inside the first clamping rod 211, and a connecting hole is opened inside the first clamping plate 212. The air passage, the connecting hole and the connecting pipe 213 are connected to form a gas channel 6.

[0083] Implementation Method 2: The first clamping rod 211 and the first clamping plate 212 are detachably connected. The first clamping plate 212 includes a plate body 2121 and a connector 2122 connected together; the plate body 2121 is fixedly connected to the connecting pipe 213; the connector 2122 has a fixed end and a connecting end, the connecting end is provided with an external thread, the fixed end is perpendicularly connected to the plate body 2121, the plate body 2121 has a first connecting hole opened along the axial direction inside, the connector 2122 has a second connecting hole opened along the axial direction inside, the first connecting hole and the second connecting hole communicate to form a flow hole, the flow hole communicates with the air passage of the first clamping rod 211 and the interior of the connecting pipe 213 to form a gas channel 6, so that gas enters the thin-walled butterfly-shaped storage tank liner 1 through the gas channel 6.

[0084] The first end of the first clamping rod 211 has an internal thread on its air passage that mates with the connecting end. The detachable connection between the first clamping rod 211 and the first clamping plate 212 is achieved through the interaction between the external thread of the connecting end and the internal thread of the first end of the first clamping rod 211.

[0085] A first washer 14 is also connected between the first end of the first clamping rod 211 and the first clamping plate 212 to increase the sealing of the connection between the first end of the first clamping rod 211 and the first clamping plate 212, and to prevent gas from leaking through the gap between the gas channel 6 at the first end of the first clamping rod 211 and the first clamping plate 212.

[0086] A flange 7 is also provided on the outside of the connection end; the flange 7 has an exhaust channel 8 inside, and an exhaust hole 9 communicating with the exhaust channel 8 on the end face of the flange 7. The end of the exhaust channel 8 away from the exhaust hole 9 is connected to the gas passage 6. Under normal circumstances, the exhaust hole 9 is sealed with a sealing nut 10. When pressure relief is required, the sealing nut 10 is opened, and the gas enters the exhaust channel 8 through the gas passage 6. The gas then flows along the exhaust channel 8 through the exhaust hole 9 and is discharged to the outside.

[0087] A second washer 15 is provided between the vent hole 9 and the sealing nut 10 to improve the airtightness at the contact point between the first clamping plate 212 and the thin-walled butterfly tank liner 1, thereby further improving the stability of the internal pressure of the thin-walled butterfly tank liner 1 during the carbon fiber winding process.

[0088] The butterfly-shaped tank liner tooling also includes a pressure mechanism 4, which includes an air pump 41 and a pressure detection element 42 for detecting the pressure of the air pump 41. The air outlet of the air pump 41 is connected to an air pipe, which is connected to the gas channel 6. The pressure detection element 42 can be a pressure sensor 3 or a pressure gauge, used to detect or display the pressure value in the air pipe, and to determine whether there is a leak or insufficient air pressure in the air pipe based on the pressure value, ensuring that the internal air pressure of the thin-walled butterfly tank liner 1 meets the requirements. In conjunction with multiple pressure sensors 3 distributed along the winding path in the thin-walled butterfly tank liner 1, it ensures that the internal air pressure and external air pressure of the thin-walled butterfly tank liner 1 are kept in a stable state, realizing a dynamic balance between the internal pressure on the thin-walled butterfly tank liner 1 and the external pressure applied to the thin-walled butterfly tank liner 1 by the composite material 5.

[0089] This application also relates to a thin-walled butterfly-shaped storage tank liner, including a liner body; a plurality of pressure sensors 3 are arranged at intervals along the winding path on the outer arc surface of the liner body; a material inlet 11 is provided on the liner body; the pressure sensors 3 are also arranged at the material inlet of the thin-walled butterfly-shaped storage tank liner 1.

[0090] In a preferred embodiment, the inner liner body is provided with mounting grooves 13 for embedding the pressure sensor 3, and the mounting grooves 13 are distributed at intervals along the winding path.

[0091] The mounting groove 13 is adapted to the shape of the pressure sensor 3. The height of the mounting groove 13 needs to be such that after the pressure sensor 3 is installed in the mounting groove 13, the outer surface of the pressure sensor 3 can just contact the composite material 5. The purpose of this setting is that during the winding process of the composite material 5, the composite material 5 contacts the pressure sensor 3, and the pressure sensor 3 monitors the tension of the composite material 5 in real time, and obtains the pressure difference between the inside and outside of the thin-walled butterfly tank liner 1. This allows for precise control of the amount of air pump 41 filling the thin-walled butterfly tank liner 1, ensuring the first dynamic balance between the internal pressure on the thin-walled butterfly tank liner 1 at different winding positions and the external pressure applied by the composite material 5 to the thin-walled butterfly tank liner 1.

[0092] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0093] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0094] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A composite material winding process for a thin-walled butterfly-shaped storage tank liner, implemented using a butterfly-shaped storage tank tooling, characterized in that, The winding process includes the following steps: S1: Multiple pressure sensors are placed on the inner lining of the thin-walled butterfly tank along the winding path of the composite material; S2: The butterfly-shaped storage tank fixture clamps the thin-walled butterfly-shaped storage tank liner and applies pressure to the interior of the thin-walled butterfly-shaped storage tank liner through the pressure mechanism of the butterfly-shaped storage tank fixture; S3: The composite material is wound onto the outer circumference of the thin-walled butterfly tank liner according to a preset winding path. The pressure at different winding positions of the thin-walled butterfly tank liner is obtained in real time by a pressure sensor. The pressure mechanism is controlled to adjust the pressure inside the thin-walled butterfly tank liner according to the maximum pressure value among the pressures at different winding positions at any same time or at any same time period during the winding process. This is to maintain a first dynamic balance between the external pressure exerted by the composite material on the thin-walled butterfly tank liner at at least part or the entire winding process and the internal pressure on the thin-walled butterfly tank liner. S4: When the thin-walled butterfly tank liner with the composite material and the butterfly tank tooling are cured together according to the curing procedure, at least during the high-temperature curing section or the entire curing procedure, the pressure sensor acquires the pressure at different winding positions of the thin-walled butterfly tank liner in real time, and controls the pressure mechanism to adjust the pressure inside the thin-walled butterfly tank liner in real time according to the maximum pressure value at different winding positions at any same time or at any same time period in the curing procedure, so that the external pressure applied by the composite material to the thin-walled butterfly tank liner at different winding positions and the internal pressure on the thin-walled butterfly tank liner are maintained in a second dynamic balance.

2. The composite material winding process for a thin-walled butterfly-shaped storage tank liner as described in claim 1, characterized in that, In step S1, the winding path is a spiral winding along the inner lining of the thin-walled butterfly-shaped storage tank; or, The winding path is as follows: circumferential winding at a preset winding angle along the first end section of the butterfly-shaped storage tank, transitioning to longitudinal spiral winding at a preset winding angle along the second end section; or... The winding path is a longitudinal spiral winding at a preset winding angle along the first end section of the butterfly-shaped storage tank, transitioning to a circumferential winding at a preset winding angle along the second end section.

3. The composite material winding process for a thin-walled butterfly-shaped storage tank liner as described in claim 1, characterized in that, When the composite material is wound around the outside of the thin-walled butterfly tank liner along the winding path, an S-shaped winding is used at the position of the flange on the surface of the thin-walled butterfly tank liner.

4. The composite material winding process for a thin-walled butterfly-shaped storage tank liner as described in claim 1, characterized in that, It also includes step S5, in which the gas inside the cured thin-walled butterfly tank liner is discharged to the outside through the exhaust port of the butterfly tank tooling.

5. A thin-walled butterfly-shaped tank liner, used in the composite material winding process for the thin-walled butterfly-shaped tank liner as described in any one of claims 1-4, characterized in that, It includes an inner liner body; multiple pressure sensors are spaced along the winding path on the outer arc surface of the inner liner body; a material inlet is opened on the inner liner body; the pressure sensors are also arranged at the material inlet of the thin-walled butterfly-shaped storage tank liner.

6. The thin-walled butterfly-shaped storage tank liner as described in claim 5, characterized in that, The inner liner body has mounting slots for embedding the pressure sensor, and the mounting slots are spaced apart along the winding path.

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