Composite material gas cylinder winding forming process and winding tool

Abstract

The invention discloses a composite material gas cylinder winding forming process and a winding tool, and relates to the technical field of composite material gas cylinder manufacturing, the composite material gas cylinder winding forming process comprises the following steps: S1, a gas cylinder liner is connected with a winding machine through the winding tool; s2, gas for an airtight test is filled into the gas cylinder inner container through a through hole in the winding tool, and the airtight test is carried out on the gas cylinder inner container and the whole winding tool; s3, after the airtightness meets the requirement, a heating medium is filled into the gas cylinder inner container through the through hole, the temperature of the outer surface of the gas cylinder inner container reaches the pre-curing temperature, the pre-curing temperature ranges from 40 DEG C to 100 DEG C, and the filling pressure of the heating medium is smaller than the yield pressure of the gas cylinder inner container; s4, fiber winding is conducted on the gas cylinder inner container through a winding machine, and in the fiber winding process and before the gas cylinder inner container enters a curing oven after fiber winding is completed, the pre-curing temperature of the outer surface of the gas cylinder inner container is kept; and S5, the gas cylinder inner container obtained after fiber winding is completed is cured and shaped through a curing oven.

Description

Technical Field

[0001] The invention relates to the technical field of composite material gas cylinder manufacturing, in particular to a composite material gas cylinder winding molding process and winding tooling. Background Art

[0002] At present, the winding process of composite gas cylinders is divided into two types: wet winding and dry winding. Among them, the wet winding process is the most widely used, that is, the fiber dry yarn is impregnated with glue in a glue tank and then wound on the gas cylinder. This method has the advantages of low investment and simple technology, but it also has disadvantages such as difficult to control the glue content, difficult to discharge bubbles in the composite material layer, insufficient fiber wettability and fiber utilization rate; the dry winding process is less used, mainly because the dry winding fiber is prepreg carbon fiber, and the high-performance prepreg carbon fiber has low output, high cost, and high requirements for winding equipment. It is currently mainly used in the aerospace field. This method has the characteristics of high winding efficiency, good quality stability, and high cost. At present, it cannot be promoted in the civilian field due to the prepreg output and cost issues.

[0003] The existing winding molding process for composite gas cylinders is simple. Although it can meet the manufacturing requirements of composite gas cylinders, there are still problems such as the inability of excess glue between the gas cylinder liner and the composite material layer to seep out quickly, insufficient fiber wettability and fiber utilization rate, difficulty in controlling the glue content, and difficulty in discharging bubbles in the composite material layer resulting in a large porosity. Summary of the invention

[0004] The purpose of the present invention is to provide a composite material gas cylinder winding molding process and winding tooling to solve the problems existing in the above-mentioned related technologies, which can increase the excess glue seepage rate between the gas cylinder liner and the composite material layer, improve the fiber wettability and fiber utilization rate, and at the same time, can improve the bubble discharge efficiency in the composite material layer, reduce the porosity of the composite material gas cylinder, reduce the risk of composite material layer delamination, and can shorten the curing molding time and improve production efficiency.

[0005] To achieve the above object, the present invention provides the following solutions: The present invention provides a composite material gas cylinder winding molding process, comprising the following steps: Step S1, connecting the gas cylinder liner to a wrapping machine through a wrapping tool, wherein the wrapping tool is a hollow structure, and one end of the wrapping tool is open and the other end is closed, the open end of the wrapping tool can be detachably connected to the bottle mouth of the gas cylinder liner and communicated with the gas cylinder liner, the closed end of the wrapping tool can be connected to the wrapping machine, and the wrapping tool is provided with a through hole; Step S2, filling the gas for airtightness test into the gas cylinder liner through the through hole, and performing an airtightness test on the gas cylinder liner and the winding tooling as a whole; Step S3, after the air tightness meets the requirements, the heating medium is filled into the gas cylinder liner through the through hole, so that the outer surface temperature of the gas cylinder liner reaches the pre-curing temperature, the pre-curing temperature is 40° C.-100° C., and the filling pressure of the heating medium is less than the yield pressure of the gas cylinder liner; Step S4, performing fiber winding on the gas cylinder liner by the winding machine, and maintaining the outer surface of the gas cylinder liner at the pre-curing temperature during the fiber winding process and after the fiber winding is completed and before entering the curing furnace; Step S5, curing and shaping the cylinder liner after the fiber winding is completed in the curing furnace.

[0006] Preferably, the heating medium is hot steam, and step S3 specifically comprises the following steps: Step S301, after the air tightness meets the requirements, the inner liner of the gas cylinder is deflated to restore the internal pressure to normal; Step S302, filling the hot steam into the gas cylinder liner through the hot steam pipeline via the through hole, wherein the hot steam pipeline is provided with a pressure regulating mechanism, and the pressure regulating mechanism can regulate the pressure in the hot steam pipeline; Step S303: After stabilization, measure the outer surface temperature of the gas cylinder liner. If the outer surface temperature of the gas cylinder liner does not reach the pre-curing temperature, adjust the pressure in the hot steam pipeline through the pressure regulating mechanism, and repeat the pressure regulating operation until the outer surface of the gas cylinder liner reaches the pre-curing temperature.

[0007] Preferably, in step S302, the pressure regulating mechanism is a pressure regulator.

[0008] The present invention also provides a composite gas cylinder winding tooling, which is used for the above-mentioned composite gas cylinder winding molding process, including a connecting tube, one end of the connecting tube is open and the other end is closed, the open end of the connecting tube can be detachably connected to the bottle mouth of the gas cylinder liner, the closed end of the connecting tube can be connected to the winding machine, and the connecting tube is provided with a through hole.

[0009] Preferably, it also includes a sealing gasket, which is used to seal the position where the open end of the connecting pipe is connected to the bottle mouth of the gas cylinder liner.

[0010] Preferably, the open end of the connecting pipe can be threadedly connected to the bottle mouth of the gas cylinder liner.

[0011] Compared with the related art, the present invention has achieved the following technical effects: By using the composite material gas cylinder winding forming process provided by the present invention, the gas cylinder liner is connected to the winding machine through the winding tooling, and before the gas cylinder liner is subjected to fiber winding, the heating medium is filled into the gas cylinder liner through the through hole on the winding tooling, so that the outer surface temperature of the gas cylinder liner reaches the pre-curing temperature of 40°C-100°C, and during the fiber winding process and after the fiber winding is completed and before entering the curing furnace, the outer surface of the gas cylinder liner is kept at the pre-curing temperature. When the fibers impregnated with the glue are wound on the gas cylinder liner, the gas cylinder liner can heat the glue, thereby reducing the viscosity of the glue, which accelerates the curing of the gas cylinder liner and the curing furnace. Excess glue seeps out between the composite material layers, allowing the glue to infiltrate the fibers, improving the fiber wettability and fiber utilization rate. On the other hand, it accelerates the discharge of bubbles in the composite material layer, reduces the porosity of the composite material gas cylinder, and reduces the risk of composite material layer stratification. In addition, the operation of heating the cylinder liner to the pre-curing temperature in this process is equivalent to adding a pre-curing stage before the curing and molding stage of the composite material gas cylinder. In this pre-curing stage, the small molecular structure inside the glue in the composite material layer is heated to form a chain structure, which is convenient for forming a network structure during curing, shortening the curing time and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic diagram of a composite material gas cylinder winding process provided in Embodiment 1 of the present invention when the gas cylinder liner is not heated; Figure 2 This is a schematic diagram of heating the inner liner of a composite material gas cylinder in the winding molding process of the composite material gas cylinder provided in Example 1 of the present invention.

[0014] In the figure: 1-cylinder liner, 2-winding tooling, 3-through hole. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0016] The purpose of the present invention is to provide a composite material gas cylinder winding molding process and winding tooling to solve the problems existing in the related technology, which can increase the excess glue seepage rate between the gas cylinder liner and the composite material layer, improve the fiber wettability and fiber utilization rate, and at the same time, can improve the bubble discharge efficiency in the composite material layer, reduce the porosity of the composite material gas cylinder, reduce the risk of composite material layer delamination, and can shorten the curing molding time and improve production efficiency.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Embodiment 1 This embodiment provides a composite material gas cylinder winding molding process, including the following steps: Step S1, connecting the gas cylinder liner 1 to the wrapping machine through the wrapping tool 2, wherein the wrapping tool 2 is a hollow structure, and one end of the wrapping tool 2 is open and the other end is closed, the open end of the wrapping tool 2 can be detachably connected to the bottle mouth of the gas cylinder liner 1 and is connected to the gas cylinder liner 1, the closed end of the wrapping tool 2 can be connected to the wrapping machine, and a through hole 3 is provided on the wrapping tool 2.

[0019] Step S2, filling the gas for airtightness test, such as compressed air, into the gas cylinder liner 1 through the through hole 3, and performing an airtightness test on the gas cylinder liner 1 and the winding tooling 2 as a whole.

[0020] Step S3, after the airtightness meets the requirements, the heating medium is filled into the cylinder liner 1 through the through hole 3, so that the outer surface temperature of the cylinder liner 1 reaches the pre-curing temperature, the pre-curing temperature is 40°C-100°C, and the filling pressure of the heating medium is less than the yield pressure of the cylinder liner 1; specifically, the state of the cylinder liner 1 and the winding tool 2 before and after the heating medium is filled is as follows Figure 1-Figure 2 As shown, Figure 2 The middle shaded portion indicates the hot area formed by the direct contact of the gas cylinder liner 1 and the interior of the winding tooling 2 with the heating medium.

[0021] Step S4, performing fiber winding on the gas cylinder liner 1 by a winding machine, and maintaining the outer surface of the gas cylinder liner 1 at a pre-curing temperature during the fiber winding process and after the fiber winding is completed and before entering the curing furnace.

[0022] Step S5, curing and shaping the gas cylinder liner 1 after the fiber winding is completed in a curing furnace.

[0023] It should be noted that, in this process, a heating medium is charged into the cylinder liner 1 so that the outer surface of the cylinder liner 1 reaches and maintains the pre-curing temperature. When the fiber impregnated with the glue is wound on the cylinder liner 1, the cylinder liner 1 can heat the glue, thereby reducing the viscosity of the glue. On the one hand, it accelerates the leakage of excess glue between the cylinder liner 1 and the composite material layer, so that the glue infiltrates the fiber, improves the fiber wettability and fiber utilization rate, and on the other hand, it accelerates the discharge of bubbles in the composite material layer, reduces the porosity of the composite gas cylinder, and reduces the risk of delamination of the composite material layer. In addition, the operation of heating the cylinder liner 1 to the pre-curing temperature in this process is equivalent to adding a pre-curing stage before the curing molding stage of the composite gas cylinder. In this pre-curing stage, the small molecular structure inside the glue in the composite material layer is heated to form a chain structure, which is convenient for forming a network structure during curing, shortening the curing molding time and improving production efficiency. This process is suitable for dry winding molding, semi-dry winding molding and wet winding molding. This process is suitable for plastic liners and metal liners.

[0024] As a possible example, the heating medium is hot steam, and step S3 specifically includes the following steps: Step S301: After the air tightness meets the requirements, the inner liner 1 of the gas cylinder is deflated to restore the internal pressure to normal.

[0025] Step S302, filling hot steam into the gas cylinder liner 1 through the hot steam pipe via the through hole 3, wherein the hot steam pipe is provided with a pressure regulating mechanism, which can regulate the pressure in the hot steam pipe.

[0026] Step S303, after stabilization (i.e., it is necessary to wait for the pressure in the gas cylinder liner 1 to stabilize, and the stabilization time is usually 3min-5min), measure the outer surface temperature of the gas cylinder liner 1. If the outer surface temperature of the gas cylinder liner 1 does not reach the pre-curing temperature, adjust the pressure in the hot steam pipeline through the pressure regulating mechanism, and repeat the pressure regulating operation until the outer surface of the gas cylinder liner 1 reaches the pre-curing temperature.

[0027] Furthermore, in step S302 , the pressure regulating mechanism is a pressure regulator, which has the functions of maintaining pressure and displaying pressure, so as to facilitate controlling the outer surface temperature of the gas cylinder liner 1 .

[0028] It should be noted that during the fiber winding process and after the fiber winding is completed and before entering the curing furnace, it is necessary to ensure that the hot steam pipeline is unobstructed and maintain the pressure inside the gas cylinder liner 1 so that the outer surface of the gas cylinder liner 1 maintains the pre-curing temperature; the outer surface temperature of the plastic liner and the metal liner needs to be adjusted according to the different materials, and the temperature can be controlled by adjusting the pressure of the hot steam filled in.

[0029] Embodiment 2 The present embodiment provides a composite gas cylinder winding tooling, which is used for the above-mentioned composite gas cylinder winding molding process, including a connecting pipe, one end of the connecting pipe is open and the other end is closed, the open end of the connecting pipe can be threadedly connected to the bottle mouth of the gas cylinder liner 1, the closed end of the connecting pipe can be connected to the winding machine, and a through hole 3 is provided on the connecting pipe.

[0030] In this embodiment, a sealing gasket is also included, which is used to seal the position where the open end of the connecting pipe is connected to the bottle mouth of the gas cylinder liner 1 to ensure the sealing performance of the connection.

[0031] In summary, the present invention has the following advantages: First, the present invention can increase the excess glue seepage rate between the gas cylinder liner 1 and the composite material layer during fiber winding, increase the bubble discharge efficiency in the composite material, and reduce the porosity of the composite material gas cylinder.

[0032] Secondly, the present invention solves the problems of difficulty in discharging bubbles and uneven curing inside and outside of thick-walled composite materials during the curing process of composite material gas cylinders.

[0033] Thirdly, the present invention solves the problem that it is difficult to control the glue content during fiber winding, especially the glue content between the gas cylinder liner 1 and the composite material layer cannot be controlled.

[0034] Fourthly, the present invention solves the problems of delamination of composite material layers and insufficient fiber utilization rate caused by insufficient glue dipping when dry yarn fibers pass through the glue tank.

[0035] Fifth, the present invention can shorten the curing and molding time of the composite material gas cylinder and improve production efficiency.

[0036] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A composite material gas cylinder winding process, characterized in that: The following steps are involved: Step S1, connecting the gas cylinder liner to a wrapping machine through a wrapping tool, wherein the wrapping tool is a hollow structure, and one end of the wrapping tool is open and the other end is closed, the open end of the wrapping tool can be detachably connected to the bottle mouth of the gas cylinder liner and communicated with the gas cylinder liner, the closed end of the wrapping tool can be connected to the wrapping machine, and the wrapping tool is provided with a through hole; Step S2, filling the gas for airtightness test into the gas cylinder liner through the through hole, and performing an airtightness test on the gas cylinder liner and the winding tooling as a whole; Step S3, after the air tightness meets the requirements, the heating medium is filled into the gas cylinder liner through the through hole, so that the outer surface temperature of the gas cylinder liner reaches the pre-curing temperature, the pre-curing temperature is 40° C.-100° C., and the filling pressure of the heating medium is less than the yield pressure of the gas cylinder liner; Step S4, performing fiber winding on the gas cylinder liner by the winding machine, and maintaining the outer surface of the gas cylinder liner at the pre-curing temperature during the fiber winding process and after the fiber winding is completed and before entering the curing furnace; Step S5, curing and shaping the cylinder liner after the fiber winding is completed in the curing furnace; The heating medium is hot steam, and step S3 specifically includes the following steps: Step S301, after the air tightness meets the requirements, the inner liner of the gas cylinder is deflated to restore the internal pressure to normal; Step S302, filling the hot steam into the gas cylinder liner through the hot steam pipeline via the through hole, wherein the hot steam pipeline is provided with a pressure regulating mechanism, and the pressure regulating mechanism can regulate the pressure in the hot steam pipeline; Step S303: After stabilization, measure the outer surface temperature of the gas cylinder liner. If the outer surface temperature of the gas cylinder liner does not reach the pre-curing temperature, adjust the pressure in the hot steam pipeline through the pressure regulating mechanism, and repeat the pressure regulating operation until the outer surface of the gas cylinder liner reaches the pre-curing temperature.

2. The composite material gas cylinder winding molding process according to claim 1 is characterized in that: In the step S302, the pressure regulating mechanism is a pressure regulator.

3. A composite material gas cylinder winding tool, used in the composite material gas cylinder winding molding process according to any one of claims 1-2, characterized in that: It includes a connecting pipe, one end of which is open and the other end is closed. The open end of the connecting pipe can be detachably connected to the bottle mouth of the gas cylinder liner, the closed end of the connecting pipe can be connected to the winding machine, and a through hole is provided on the connecting pipe.

4. The composite material gas cylinder wrapping tool according to claim 3 is characterized in that: It also includes a sealing gasket, which is used to seal the position where the open end of the connecting pipe is connected to the bottle mouth of the gas cylinder liner.

5. The composite material gas cylinder wrapping tool according to claim 3 is characterized in that: The open end of the connecting pipe can be threadedly connected to the bottle mouth of the gas cylinder liner.

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