JP2023085838A - Inner container manufacturing equipment and inner container manufacturing method - Google Patents

Abstract

To provide manufacturing equipment for inner containers and a manufacturing method for inner containers that can efficiently cool even large, complex-shaped inner containers and manufacture them in a short time.SOLUTION: Equipment for manufacturing inner containers used for liquid hydrogen containers, etc., for manufacturing inner containers derived from forming resin while rotating at least a cylindrical mold using a rotating device, and at least a mold heating section, an inner forming section, and a cooling section, the inner forming section has an oscillating device for oscillating the cylindrical mold in a horizontal direction while the mold is rotating.SELECTED DRAWING: Figure 1

Description

The present invention relates to an inner container manufacturing apparatus and an inner container manufacturing method for use in a liquid hydrogen container.
In particular, an inner container manufacturing apparatus suitably used for a liquid hydrogen container for filling liquid hydrogen for hydrogen engine fuel, and an efficient inner container manufacturing method using such an inner container manufacturing apparatus Regarding.

In recent years, various types of hydrogen fuel tanks for fuel cell vehicles have been proposed, and fiber reinforced plastics (FRP) have come to be used in order to reduce weight and increase strength.
That is, as a hydrogen fuel tank using such fiber-reinforced plastic, a hydrogen fuel tank in which the outer side of a metal inner or a plastic inner is reinforced with an aramid fiber-reinforced resin layer has been proposed (for example, Patent Document 1 reference).
More specifically, the aramid fiber-reinforced resin layer includes a hoop-wound layer in which aramid fibers are hoop-wound, a helical-wound layer in which aramid fibers are helically-wound, and/or an in-plane-wound layer in which aramid fibers are helically wound. and consists of
The thickness of the hoop wound layer is usually 50 to 75% of the thickness of the entire fiber-reinforced resin layer, thereby exhibiting sufficient strength against circumferential stress and sufficient strength against axial stress. expected to do so.

In addition, by forming a seamless and uniform rotating body structure, the impermeability to gas is improved, the mechanical strength is large, and the multi-layer thermoplastic resin structure for gas tanks such as hydrogen, which is excellent in light resistance and solvent resistance. has been proposed (see, for example, Patent Document 2).
More specifically, a multilayer resin layer containing at least an ethylene-vinyl alcohol copolymer-containing layer having a predetermined thickness, a predetermined density and a melt flow index, and a layer made of other thermoplastic resins is prepared by cassia ( It has been proposed to use a CACCIA (registered trademark) type twin-screw rotary molding machine or the like.
Japanese Patent Application Laid-Open No. 2002-340291 (Claims, FIG. 1, etc.) Japanese Patent No. 5121110 (Claims etc.)

However, in the manufacture of the liquid hydrogen container (hydrogen fuel tank) of Patent Document 1, there is a problem that no consideration or mention is made of an efficient method of manufacturing the inner (inner container) disposed inside. rice field.
That is, only the aspect of the aramid fiber reinforced resin layer formed around the inner container and the design fiber reinforced resin layer group are mentioned, and depending on the type of various automobiles, liquids such as large size and complicated shapes There is a problem that no consideration is given to the efficient production of the inner container used for the hydrogen container.

In fact, it has been considered to divide the inner container into halves, perform injection molding on each of them, and combine them to form a single inner container. There was a problem of lack of sexuality.
Furthermore, when the halved inner containers are joined by injection molding, it is necessary to take a long cooling time because dimensional stability with higher precision is required. Therefore, for example, even in the case of a liquid hydrogen container mounted on a small passenger car, it took eight hours or more to cool the inner container per inner container.

In addition, the thermoplastic resin structure of the rotating body of Patent Document 2 uses a plurality of types of predetermined resins, and in producing a predetermined container, specifically, Cassia (CACCIA (registered trademark)) type biaxial rotational molding machine was used.
Therefore, it was impossible to continuously manufacture the inner container from mounting the predetermined mold to removing the mold, and it was difficult to form the inner container in a short period of time.
Furthermore, in the case of a biaxial rotary molding machine, it is necessary to rotate the mold in two axial directions in the mold heating device in order to form a predetermined container.
As a result, the mold heating device becomes large, and a special transfer device or the like is required to bring the mold heating device closer to the mold, which complicates the structure of the mold heating section considerably. was also seen.

Therefore, the inventors of the present invention made an earnest effort to solve this problem, and as a result, produced an inner container derived from a forming resin while rotating a cylindrical mold using a rotating device. The inventors have found that even an inner container used for a liquid hydrogen container having a large size and a complicated shape can be formed very easily and in a short period of time, and have completed the present invention.
That is, according to the present invention, an inner container manufacturing apparatus capable of extremely rapidly and stably manufacturing an inner container used for a liquid hydrogen container, and an inner container manufacturing apparatus using such an inner container manufacturing apparatus. The object is to provide an efficient manufacturing method.

According to the present invention, there is provided an apparatus for manufacturing an inner container used for a liquid hydrogen container, which manufactures an inner container derived from a forming resin while rotating a cylindrical mold using a rotating device. A heating section, an inner molding section, and a cooling section are provided, and the inner molding section is provided with a rocker for rocking the cylindrical mold in the left-right direction while being rotated by a predetermined rotating device. There is provided an apparatus for manufacturing an inner container, characterized in that it is provided with an apparatus, which can solve the above-mentioned problems.
That is, by configuring the device so as to manufacture an inner container derived from the forming resin while rotating a cylindrical mold using a rotating device, a large size (for example, a maximum length of about 5 m and a maximum diameter of 5 m) can be obtained. large cylindrical shape with a wall thickness of about 5 to 100 mm) and a complex shape (for example, a container shape with an inlet and an outlet for liquid hydrogen at the front and back). , can be formed very easily and in a short time.

In constructing the inner container manufacturing apparatus of the present invention, it is preferable that at least one resin injection device for injecting molding resin into the cylindrical mold is provided in the inner molding section.
By providing the resin injection device in this way, it is possible to accurately inject the amount of forming resin necessary for molding the inner container into the rotating or non-rotating mold.

Further, in constructing the inner container manufacturing apparatus of the present invention, the rotating device inserts a wheel into a groove provided on the surface of the cylindrical mold and rotates the wheel to rotate the cylindrical mold. It is preferable to have a rotation mechanism that allows the rotation.
By providing a predetermined rotating device in this manner, even with a simple configuration, the cylindrical mold can be rotated at a predetermined number of rotations with high accuracy.

In constructing the inner container manufacturing apparatus of the present invention, at least the mold heating section, the inner molding section, and the cooling section each include a mold expelling member for moving the cylindrical mold forward. is preferably provided.
In this way, by providing a predetermined mold expelling member, it is possible to transfer the cylindrical mold forward while accurately rotating it at a predetermined number of revolutions.

In constructing the apparatus for manufacturing the inner container of the present invention, in the cooling unit, the cylindrical mold is rotated by inserting wheels into the grooves provided on the surface of the cylindrical mold and rotating the wheels. It is preferable to have at least one mold cooling device for cooling while cooling.
Thus, by providing a predetermined mold cooling device, it is possible to efficiently cool the cylindrical mold even with a simple configuration.

Further, in constructing the inner container manufacturing apparatus of the present invention, it is preferable that the mold heating section is composed of a preheating section and a main heating section.
In this way, by using the mold heating unit with a predetermined configuration, the preheating unit preheats to a temperature close to the predetermined temperature, and the main heating unit heats the rotating predetermined mold more uniformly and It can be rapidly heated to a predetermined temperature.

Another aspect of the present invention is a method for manufacturing an inner container for use in a liquid hydrogen container, using an inner container manufacturing apparatus including at least a mold heating section, an inner molding section, and a cooling section. A method for manufacturing an inner container characterized by comprising the following steps (1) to (3).
(1) A step of heating a cylindrical mold in a mold heating section and setting it to a predetermined temperature while rotating it with a rotating device. (3) A step of rotating and cooling the cylindrical mold in the cooling section. By manufacturing the inner container derived from the forming resin while rotating it using a rotating device, even an inner container used for a liquid hydrogen container having a large size and a complicated shape can be produced in a very simple and short manner. can be formed in time.

In carrying out the method for manufacturing an inner container of the present invention, it is preferable that at least one or more resin injection devices are provided in the inner molding portion, and a fixed amount of forming resin is injected using the resin injection device. .
By injecting a fixed amount of the forming resin in this way, the amount of forming resin necessary for molding the inner container can be accurately injected into the mold.

FIG. 1 is a diagram for explaining an outline of an inner container manufacturing apparatus according to a first embodiment. FIGS. 2(a) and 2(b) are diagrams provided for explaining the mold heating section in the first embodiment. FIGS. 3(a) and 3(b) are diagrams for explaining the mold heating device in the mold heating section. FIGS. 4A to 4C are diagrams for explaining the conveying device and its operation in the first embodiment, respectively. FIGS. 5(a) and 5(b) are diagrams provided for explaining the inner molded portion in the first embodiment. 6(a) and 6(b) are diagrams for explaining the resin injection device in the inner molding portion. 7(a) to (d) are diagrams provided for explaining the cylindrical mold and the liquid hydrogen container, respectively. FIG. 8 is a flow diagram of a method for manufacturing an inner container according to the second embodiment.

[First embodiment]
The apparatus for manufacturing an inner container used for a liquid hydrogen container, which is the first embodiment, manufactures an inner container derived from a forming resin while rotating a cylindrical mold using a rotating device. A device comprising a mold heating section, an inner molding section, and a cooling section, and the inner molding section is provided with a rocking device for rocking the mold in the left-right direction while it is being rotated. The apparatus for manufacturing an inner container is characterized by:
Hereinafter, each part constituting the inner container manufacturing apparatus will be specifically described with reference to the drawings as appropriate.

1. Mold heating unit (1) overall configuration 1) Main components The mold heating unit is the portion indicated by A in the inner container manufacturing apparatus 1, as shown in FIG. , a portion for heating to a predetermined temperature.
That is, as shown in FIGS. 2(a) and 2(b), the mold heating unit includes, as the mold heating device 2, at least a predetermined frame 21 composed of a lower frame 21a and an upper frame 21b, and a rotating device 27. , a heating device 25 and a conveying device 23 are preferably included.

2) Specifically, a predetermined frame that holds various devices, a rotating device that rotates a cylindrical mold placed above it, and a heat source that is brought close to the cylindrical mold to heat the cylindrical mold. It is preferable to include a heating device, a conveying device that abuts against the cylindrical mold and pushes the mold toward the inner molding section, which will be described later.
The reason for this is that with such a configuration, a predetermined cylindrical mold can be heated in a rotating state or a non-rotating state, and the decrease in temperature of the mold can be suppressed. , is easier to transport to the next device.

3) Further, it is preferable that the mold heating section is composed of a preheating section and a main heating section.
The reason for this is that the mold heating unit includes not only the main heating unit but also the predetermined preheating unit, so that the predetermined cylindrical mold into which the molding resin is not charged can be heated to the predetermined temperature. (for example, 100 to 180° C. or less), it can be preheated in a rotating state or even in a non-rotating state.
Therefore, the main heating part can heat the rotating predetermined cylindrical mold more uniformly and quickly to a predetermined temperature (for example, 180 to 250 ° C.) higher than the preheating temperature, and in turn, the cylindrical mold It can prevent thermal damage to the mold and significantly improve the durability.

(2) Specific configuration 1) Rotating device In addition, as shown in FIG. As such, it preferably includes at least one rotating mechanism for rotating the cylindrical mold 14 .
The reason for this is that by configuring in this manner, the cylindrical mold 14 can be rotated with high accuracy while being heated, and in turn, the cylindrical mold 14 can be heated more uniformly to a predetermined temperature. .

In addition, although the number of rotating mechanisms can be changed as appropriate, in order to stably rotate the cylindrical mold, as shown in FIGS. It is more preferable to provide two in the left and right direction (horizontal direction) on the front side and two in the left and right direction (horizontal direction) on the back side toward D1 (hereinafter sometimes simply referred to as the traveling direction D1). preferable.
Further, since it is easy to maintain the parallelism of the cylindrical mold 14, it is preferable that the rotating mechanism is arranged at positions close to both ends of the cylindrical mold 14. More specifically, for example, , preferably within a range of 10 to 30 cm from both ends of the cylindrical mold 14 .

The number of rotations of the cylindrical mold by the rotation device should be appropriately selected according to the size and thickness of the inner container, the type of resin used for forming the inner container, etc., but is usually 1 to 100 rpm. is preferably a value within the range of
The reason for this is that even if the rotation speed of the cylindrical mold is 1 rpm or less or exceeds 100 rpm, uneven heating may occur, and control of the rotation mechanism may become difficult. .
Therefore, it is more preferable to set the rotational speed of the cylindrical mold to a value within the range of 5 to 60 rpm, and more preferably to a value within the range of 10 to 40 rpm.

Furthermore, as shown in FIG. 7B, which will be described later, the groove 14a provided in the cylindrical mold is formed by combining two flanges 15 each having a diameter W2 larger than the diameter W1 of the cylindrical mold, and connecting them in parallel. It is preferable to form it as a gap when arranged.
Therefore, it is preferable to set the diameter W1 of the cylindrical mold to a value within the range of 20 to 500 cm, and to set the diameter W2 of the flange 15 to a value within the range of 21 to 530 cm.
Also, the depth W3 of the gap is preferably within the range of 0.5 to 15 cm, and the size of the gap, that is, the width W4 of the groove portion is preferably within the range of 0.5 to 20 cm.

However, when two flanges are combined, it is not necessary to arrange them completely parallel.In order to facilitate the insertion of the wheel, the ends of the two flanges should be aligned when viewed from the side of the cylindrical mold. It is also preferable to deform the gap so as to form an inverted V shape (inverted tapered shape).
More specifically, the ends of the two flanges are deformed so as to have an angle of 5 to 30° in the left-right direction with respect to the center line assumed in the center of the gap, and then arranged. is also preferred.

2) Heating device The type of heating device for the cylindrical mold is not particularly limited as long as it can heat the cylindrical mold to a predetermined temperature, but usually a flame burner (line burner), an electric It is preferable to include at least one of a heater, an induction heating device, and the like.
The reason for this is that the use of such a heating device can effectively prevent uneven heating in the cylindrical mold.

Therefore, in particular, as shown in FIG. 3A, a flame burner 25a (sometimes referred to as a line burner) radiates a stable flame by mixing fuel such as combustible gas or combustible oil with air and igniting it. There is.) is preferably provided.
The reason for this is that it is possible to heat a wide range of cylindrical molds to a predetermined temperature in a relatively short period of time by adjusting the amount of air supplied, the flow rate of fuel, and the like.
That is, it is more preferable to include at least one of a gas burner, an oil burner, a gas/oil co-firing burner, etc. as the flame burner 25a.

Moreover, as another aspect of the heating device, it is preferable to have an electric heater that uses electricity to emit Joule heat or far infrared rays.
The reason for this is that there are less restrictions on the location of installation, and not only is it easier to reduce the size and weight, but it is also environmentally friendly because the amount of carbon dioxide emissions can be limited.

Moreover, it is preferable to include at least one of a ceramic heater, a ribbon heater, a sheathed heater, and the like as the electric heater 25b.
For example, as shown in FIG. 3B, the ceramic heater as the electric heater 25b includes, from the rear, a blower 253, a hose 254, a hose connection port 251a, a rectifying plate member 255, and a discharge adjusting member 258 provided with a vent. , a far-infrared radiation heating element 259 , and a housing 251 .
The reason for this is that the far-infrared radiation heating element 259 has a thin belt-like conductive material as a substrate, the surface of which is thermally sprayed coated with a ceramic material, and when the substrate is energized, heat is generated and the ceramic material This is because far-infrared rays 260 can be radiated forward from the surface to achieve a predetermined heating temperature.
Therefore, each ceramic heater has a rectangular shape with an irradiation area of 250 x 250 mm2, and uses a three-phase, 200 V, 30 A rated power source to generate heat from 1 to 6 kW/piece. preferably.

The arrangement of the heating device is not particularly limited as long as it can heat the cylindrical mold to a predetermined temperature and does not interfere with the transfer. It is preferable to arrange a plurality of them along the longitudinal direction.
The reason for this is that with such an arrangement, the mold can be uniformly heated along the longitudinal direction, and the occurrence of uneven heating can be more effectively prevented.

That is, for example, as shown in FIGS. 2(a) and 2(b), the heating devices can be arranged in a range of 1 to 8 rows in the traveling direction D1 (see FIG. 1) below the mold heating device 2. , more preferably 2 to 6 rows, and even more preferably 3 to 5 rows.
Here, in the first embodiment, along the longitudinal direction of the cylindrical mold, gas-fueled line burners having slit-shaped flame radiation holes are arranged in three rows in the traveling direction D1. are placed.

3) Conveying device Further, the mold heating unit preferably has a conveying device for lifting the cylindrical mold upward from the rotating device and transferring it forward along the traveling direction D1.
Here, the form of the conveying device for cylindrical molds is also not particularly limited, but for example, as shown in FIGS. Preferably, an extension member is provided.
The reason for this is that the provision of the predetermined die ejecting member enables the cylindrical die to be rapidly and stably moved forward in a rotating state or a non-rotating state. This is because it can be transported.

More specifically, as shown in FIG. 4(a), the die ejecting member is lifted in the direction of symbol D2 by a cylinder 23a and is provided below the cylindrical die 14. It is preferable that the lifter 23b is inclined downward toward the traveling direction D1.
Therefore, with this configuration, the cylindrical mold 14 can be lifted from the wheels 27a only by the upper and lower sides of the lifter 23b, and can be transferred in the traveling direction D1 by rolling along the slope. can.
Therefore, even with such a simple configuration, the cylindrical mold can be transferred quickly and stably.

Further, as shown in FIG. 4(b), the die ejecting member includes a lifter 23b positioned below the cylindrical die 14, which is moved up and down by a cylinder 23a, and the lifter 23b moves the cylindrical die 14 to the symbol D3. and a pressing mechanism 23c for pressing in the direction.
The reason for this is that by adopting such a configuration, the timing of lifting and the timing of pressing in the direction of symbol D3 can be shifted, and the cylindrical mold can be transferred more quickly, such as by keeping the cylindrical mold on standby in the lifted state. because it can

Further, as shown in FIG. 4(c), the die ejecting member sandwiches the cylindrical die 14 from the left and right at the upper position of the cylindrical die 14 and lifts it up, and also lifts it up in order to move in the direction of the symbol D4. Preferably, it consists of mechanism 23d.
The reason for this is that by configuring in this way, the cylindrical mold 14 can be transported while suspended at a predetermined height without rolling, and can be transported more stably.

In addition, as shown in FIG. 2(a), the mold heating unit is retracted from the transfer path when the cylindrical mold 14 is transferred, and is covered with a partition wall during heating, so that the inside and outside of the partition wall can be moved. It is preferable to have a shutter mechanism 29 that reduces heat transfer.
That is, the shutter mechanism 29 is provided with a heat insulating wall 29b that covers at least the side surface or the top surface of the cylindrical mold 14, and a shutter drive unit 29a that moves the heat insulating wall 29b up and down along the upper frame 21b. preferable.
This is because the cylindrical mold 14 can be prevented from being hindered in its transfer, and when the cylindrical mold 14 is heated, the temperature of the heated air around it can be effectively prevented from decreasing. This is because the molding of the inner container 16 can be performed more quickly.

2. Inner Molding Section (1) Overall Configuration As shown in FIG. 1, the inner molding section is a portion indicated by B section of the inner container manufacturing apparatus 1, and as an overall configuration, a cylindrical mold 14 is rotated. In this portion, the inner container 16 is molded while being swung in the lateral direction.
The inner molding section preferably includes at least an inner molding device 4 and a resin injection device 6 for quantitatively injecting a forming resin into the cylindrical mold 14. .
The reason for this is that the inner molding portion having such a configuration enables the desired inner container to be molded quickly and stably.
Therefore, the inner molding device 4 transports the cylindrical mold 14 to the next process at least at the stage where the predetermined frame 41 consisting of the lower frame 41a and the upper frame 41b, the swing device 42, and the inner container are molded. It is preferable that a conveying device 43 and a rotating device 47 are provided.

Further, the inner molding device 4 preferably includes a heating device (not shown) for heating the cylindrical mold 14 while rotating and rocking.
The reason for this is that by providing a heating device in the inner molding section as well, the temperature of the cylindrical mold 14 heated by the mold heating section can be maintained, and the inner container 16 can be molded more quickly. This is because it can be done
Therefore, when the mold heating section is composed of a preheating section and a main heating section, it is also preferable to configure the inner molding section as part of the main heating section or as the main heating section itself.

(2) Specific Configuration 1) Resin Injection Device It is preferable that the inner molding section includes at least one resin injection device for quantitatively injecting the forming resin into the cylindrical mold.
The reason for this is that by providing the resin injection device in this way, the amount of forming resin necessary for molding the inner container can be accurately and quantitatively injected into the rotating mold. It's for.
As a specific resin injection device, any device that can quantitatively supply the forming resin may be used, but a screw feeder, a rotary feeder, a table feeder, or the like is preferable.
The reason for this is that the injection amount of the forming resin can be adjusted more accurately and quickly.

Therefore, as an example, when using a screw feeder, as shown in FIG. It is preferable to comprise a screw 64 for conveying the forming resin 60 in a predetermined direction, a wall surface 66 and a motor 68 for rotating the screw 64 .
In addition, the resin injection device 6 is arranged in the direction of symbol D6 (see FIG. 6(b )), it is preferable to have a slide mechanism 61a.

Further, as shown in FIG. 6(b), if at least two or more resin injection devices 6 are provided, the inner container formed by two-color molding or the inner container formed by three-color molding can be sequentially or alternately molded. can be easily obtained by injecting different resins.
That is, in such a configuration, it is preferable to have a slide mechanism 61b for moving the resin injection device 6 in the direction of the symbol D7 in order to change the type of the forming resin 60 to be injected.
The reason for this is that with this configuration, for example, as shown in FIG. This is because it becomes easy to form a multilayer inner container composed of three layers 16c and 16c.
In addition, the first resin layer 16a, the second resin layer 16b, and the third resin layer 16c are arranged such that the melting point (in the case of non-crystalline resin, the softening point) becomes lower toward the inside. In addition, it is preferably formed using a forming resin which will be described later.

As for the type of forming resin, it is preferable to select according to the size and thickness of the inner container, the usage environment, etc. Generally, polyethylene, polypropylene, polymethylpentene, polyester, polyamide, polybutene and polyvinyl are used. At least one resin such as alcohol, polyvinyl chloride, polyurethane, polycarbonate, polyarylate, polyvinyl acetate, polystyrene, polyacryl, polyvinyl chloride, ABS, SBS, SIS (including partially crosslinked products thereof) is used. is preferred.
The reason for this is that the use of such a thermoplastic resin or partially cross-linked material makes it possible to stably form an inner container having less unevenness in thickness and excellent pressure resistance, mechanical resistance, and the like.

When the inner container has a multi-layer structure, it is preferable to use a plurality of forming resins having different melting points and softening points.
That is, for example, three forming resins (M1>M2>M3) having different melting points and softening points are prepared, and a resin layer derived from the forming resin (M1) having the largest values is first formed, and then By forming a resin layer derived from a forming resin (M2) with a medium value of and finally forming a resin layer derived from a forming resin (M3) with the lowest values, a uniform thickness is obtained. The inner container can have a three-layer structure.

2) Rotating device The rotating device 47 in the inner molding section is not particularly limited as long as it has a predetermined rotating mechanism capable of precisely rotating the cylindrical mold 14 .
However, as a preferred example, as shown in FIGS. 5(a) and 5(b), a rotating mechanism for rotating the cylindrical mold 14 by inserting wheels 47a into grooves 14a provided in the cylindrical mold 14. is preferably provided.
The reason for this is that by providing such a rotating mechanism, the cylindrical mold 14 can be accurately rotated at a predetermined number of revolutions even with a simple configuration.
Furthermore, by fitting the wheels 47a of the rotating device into the grooves 14a of the cylindrical mold 14, even when the cylindrical mold 14 is rocked in the left-right direction, the position of the mold 14 does not easily shift, and the predetermined This is because it can be held in place.

Further, it is preferable that the contents of the rotating device are basically the same as those already explained in the rotating device in the mold heating section. It is also preferable to make it different from the number of revolutions in the part.
More specifically, it is also preferable to make the number of rotations of the cylindrical mold by the rotating device lower than the number of rotations in the mold heating section, so that the inner layer having a predetermined thickness can be molded more reliably.
Therefore, for example, the rotation speed of the cylindrical mold by the rotating device in the inner molding section is preferably within the range of 0.5 to 100 rpm, more preferably within the range of 3 to 60 rpm, and more preferably 5 to 40 rpm. is more preferably within the range of

3) Heating device The type of heating device is not particularly limited as long as it can heat the cylindrical mold to a predetermined temperature, but usually flame burners (line burners), electric heaters, induction heating devices, etc. is preferably configured to include at least one of
Moreover, it is preferable that the heating device is fixed to a later-described swing frame so as to operate in accordance with the swing of the cylindrical mold.
The reason for this is that by configuring in this way, the movement of the cylindrical mold and the heating device can be synchronized, and the occurrence of uneven heating can be prevented more effectively.
Regarding the content of the heating device, it is preferable that the content of the heating device is basically the same as that of the heating device in the mold heating section, but it is also preferable that the content of the heating device is changed in accordance with the various inner container modes. .

4) Rocking device The rocking device is a device that repeatedly rocks the cylindrical mold in the left-right direction while rotating it, and has a uniform thickness while preventing aggregation and unevenness of the formed resin. This is a device for making an inner container used for a liquid hydrogen container.
Here, the left-right direction is the direction in which the cylindrical mold is tilted so that it is tilted at a predetermined angle with respect to the horizontal direction when viewed in the traveling direction D1 (see FIG. 1).

Therefore, as shown in FIG. 5(a), a preferred example of the rocking device 42 includes a rotating shaft 42a arranged on the lower frame 41a and a seesaw-type rocker with the rotating shaft 42a as a fulcrum along the traveling direction D1. It is preferable to provide a swinging frame 42b that swings freely and a swinging member that swings the swinging frame 42b.
The reason for this is that by providing such a swinging member, the cylindrical mold can be smoothly swung, and in addition, it is possible to effectively prevent the occurrence of unevenness in thickness during molding of the inner container. This is because

Further, the swinging member is not particularly limited as long as it is a member that can swing left and right with respect to the traveling direction D1. , and preferably includes a configuration for converting rotary motion or linear motion of the actuator into swing motion by a link or the like.
This is because, by configuring in this way, even with a simple configuration, it is possible to swing more stably.

That is, as an example, as shown in FIG. 5A, the swinging member includes a fixed frame 42c that supports the rotating shaft 42a, a fan-shaped guide 42d that spreads from the rotating shaft 42a toward the lower side of the swinging frame 42b, It is preferable that the swing roller 42e is in contact with the circular arc portion of the fan-shaped guide 42d at the lower position.
This is because the later-described swing speed and swing angle θ can be more easily adjusted by setting the rotation angle and rotation speed of the swing roller 42e.

The rocking time is preferably determined in consideration of the type of forming resin, the thickness of the inner container, the heating temperature of the cylindrical mold, the rotational speed of the cylindrical mold, etc., but it is usually 30 to 600 seconds. is preferably in the range of
The reason for this is that by setting such a swinging time, it is possible to more effectively prevent the occurrence of thickness unevenness and the like in the molding of the inner container.
Therefore, the rocking time is more preferably in the range of 45 to 300 seconds, more preferably in the range of 60 to 120 seconds.
The rocking motion of the cylindrical mold in the rocking device may be performed continuously or non-continuously at intervals of a predetermined time.

The rocking speed is preferably determined in consideration of the type of resin to be formed, the thickness of the inner container, the heating temperature of the cylindrical mold, the number of revolutions of the cylindrical mold, etc. Usually, it is 2 per 60 seconds. It is preferably in the range of 12 times, more preferably in the range of 3 to 10 times, even more preferably in the range of 4 to 8 times.
The reason for this is that by setting the rocking speed to such a speed, it is possible to more effectively prevent the occurrence of thickness unevenness and the like in the molding of the inner container.

As shown in FIG. 5(b), the swing angle θ is not particularly limited as long as the forming resin is uniformly dispersed. Assuming that the tilt angle from the horizontal state is the swing angle θ, the swing angle θ is preferably in the range of 5 to 60°.
The reason for this is that such an angle makes it possible to more effectively prevent the occurrence of thickness unevenness and the like in the molding of the inner container.
Therefore, the swing angle θ is more preferably in the range of 10 to 45°, more preferably in the range of 15 to 30°.

Also, the swing angle θ (see FIG. 5(b)) may be always constant, but it is also preferable to set it to a different angle for each swing.
That is, it is also preferable that the rocking angle is relatively large at the stage of injecting the forming resin, and the rocking angle θ is gradually decreased.
The reason for this is that it is possible to more effectively prevent the occurrence of unevenness in thickness when molding the inner container.
Therefore, it is preferable to change the swing angle θ in 2 to 10 steps, more preferably in 3 to 8 steps, and even more preferably in 4 to 6 steps.

5) Conveying device As shown in Figs. 5(a) and 5(b), it is preferable that the inner molding section is also provided with a conveying device 43 similar to the mold heating section.
That is, it is preferable to provide a predetermined mold ejecting member as the conveying device 43, as shown in FIGS. 4(a) to 4(c).
The reason for this is that, by providing a predetermined mold expelling member in this manner, the cylindrical mold can be transferred forward while being accurately rotated at a predetermined number of revolutions.
The details of the conveying device may be basically the same as those already explained for the conveying device in the mold heating section, but may be different.

Moreover, as shown in FIG. 5(a), it is preferable that the inner molding section is also provided with a shutter mechanism 49 like the mold heating section.
That is, the shutter mechanism 49 is provided with a heat insulating wall 49b that covers at least the side surface or the top surface of the cylindrical mold 14, and a shutter drive unit 49a that moves the heat insulating wall 49b up and down along the upper frame 41b. preferable.
The reason for this is that the cylindrical mold 14 can be prevented from being hindered in its transfer, and during heating, the temperature of the surrounding heated air can be effectively prevented from decreasing, which in turn facilitates the molding of the inner container 16 in the inner molding section. , because it can be done more quickly.
The contents of the shutter mechanism 49 may be basically the same as those already explained in the shutter mechanism in the mold heating section, but may be different.

3. Cooling Section (1) Overall Configuration As shown in FIG. 1, the cooling section is a section indicated by C section of the inner container manufacturing apparatus 1, and the inner container 16 is formed through the inner forming section. This is a portion where the inner container 16 is sufficiently solidified by cooling the cylindrical mold 14 in a state to a predetermined temperature while rotating.
That is, in the cooling unit, at least a mold cooling device 8 that cools the cylindrical mold 14 while rotating by inserting wheels into grooves provided on the surface of the cylindrical mold 14 and rotating the wheels It is preferable to have one.

Specifically, the mold cooling device includes at least a predetermined frame that holds various devices, a rotating device that rotates the cylindrical mold, a cooling device, and a conveying device that conveys the cylindrical mold to the next process. , is preferably included.
This is because the inner container molded in the inner molding section can be cooled quickly and stably, and the inner container can be easily taken out to the outside.
Therefore, it is more preferable that the cooling section is divided into a plurality of sections and a die cooling device is provided for each section.
The reason for this is that the cylindrical mold can be cooled in stages, and the retention of the cylindrical mold that occurs when the cooling time in the cooling section is longer than the molding time in the inner molding section can be effectively prevented. It's for.

(2) Concrete Configuration Moreover, as shown in FIG. 1, it is preferable that the cooling device for the cylindrical mold is basically an air-cooling device that accompanies rotation.
The reason for this is that if the temperature of the cylindrical mold is lowered at an excessive speed, so-called sink marks and internal strain are likely to occur in the inner container, resulting in a significant decrease in dimensional stability. This is because there are cases where
Moreover, by providing a plurality of air-cooling stages accompanied by rotation and transporting between them by means of a transporting device, it becomes easy to appropriately adjust the time required until the inner container is molded.

However, it is also preferable to attach various cooling devices (spraying, immersion, mist, etc.) to cool the cylindrical mold stepwise so as to obtain an arbitrary temperature profile.
That is, although not shown, the cooling part is sealed, and an air current for air cooling is flowed by a fan or the like, or water or alcohol is sprayed, immersed in them, or in the presence of mist or the like. In addition, it is also preferable to place while rotating.
By providing a conveying device for conveying to the next process, a desired inner container can be quickly and stably molded and taken out to the outside.

Further, as the rotating device in the cooling section, it is preferable to have basically the same content as the rotating device in the mold heating section, but it is also preferable to adopt a different aspect.
For example, the rotation speed is preferably 5 to 80% of the rotation speed of the rotating device in the mold heating section.
The reason for this is that the number of rotations can be adjusted based on the state of solidification of the inner container in the cooling section, and the occurrence of thickness unevenness and the like can be prevented more effectively.
Therefore, the rotation speed is more preferably 10 to 60%, more preferably 20 to 40%, of the rotation speed of the rotating device in the mold heating section.

4. Mold Mounting Portion The mold mounting portion indicated by A′ in FIG. 1 is a portion for mounting the cylindrical mold 14 on a predetermined position of the frame prior to preparation for starting the manufacturing apparatus. , can be regarded as part of the mold heating section (A section).
The type of cylindrical mold used for molding the inner container of the liquid hydrogen container is not particularly limited, and cylindrical molds made of known materials such as iron, copper, iron alloys, castings, etc. If so, any of them can be suitably used.
Various modes can be used for the cylindrical mold to be mounted at a predetermined location. A cylindrical mold 14 is preferably provided.

5. Demolding Section The demolding section indicated by C′ in FIG. C section).
That is, as shown in the cylindrical mold 14 having the configuration shown in FIG. 7(a), the hatch 14c provided at the end is opened to remove the inner container 16 from the cylindrical mold 14 and can be taken out.

At that time, it is preferable to place the cylindrical mold 14 on the upper side of the predetermined base 12 shown in FIG.
The reason for this is that by placing an empty cylindrical mold 14 on the upper side of a predetermined frame 12 with wheels, it is transferred as a carriage to the mold mounting portion indicated by A' in FIG. This is because the cylindrical mold 14 can be quickly supplied by using it as the predetermined mount 10 in the mounting section.

6. Fiber-reinforced resin layer forming unit (1) content The fiber-reinforced resin layer forming unit for the inner container is the next step following the inner container manufacturing apparatus, and can be included in the inner container manufacturing apparatus.
That is, a fiber-reinforced resin layer formed by mixing a resin material such as epoxy resin or phenol resin and at least one of fiber such as glass fiber or carbon fiber is formed on the outer side of the inner container. It is also preferred to include a forming portion.

The fiber-reinforced resin layer preferably has a configuration in which finely cut fibers are mixed with resin and cured, or a configuration in which fibers arranged in the same direction are impregnated with resin and cured. .
The reason for this is that such a configuration enables the inner container to have a higher strength.
Furthermore, as shown in FIG. 7(d), a fiber reinforced resin layer 17a can be formed on the outer side of the molded inner container 16. For example, the liquid hydrogen container 17 has a complicated inner wall with a convex portion 16d inside. This is because it becomes easier to manufacture the

(2) Thickness The thickness of the fiber-reinforced resin layer is preferably determined in consideration of the size and shape of the inner container, the pressure of the liquefied hydrogen to be filled, etc., but is usually within the range of 1 to 50 mm. is preferably the value of
The reason for this is that the strength of the inner container can be further improved without excessively increasing the weight.
Therefore, it is more preferable to set the thickness of the fiber-reinforced resin layer to a value within the range of 5 to 40 mm, and more preferably to a value within the range of 10 to 30 mm.

(3) Winding method In forming the fiber-reinforced resin layer, the carbon fiber is swept. , preferably a combination of these.
The reason for this is that the strength of the inner container can be effectively improved without excessively increasing the weight.

7. Operation The operation of the manufacturing apparatus when forming the inner container used for the liquid hydrogen container configured as described above will be described in detail in the second embodiment with reference to the flow chart of FIG. to explain.
However, according to the inner container (single-layer structure) manufacturing apparatus of the first embodiment, the manufacturing operation in the manufacturing process is continuous, and the mold heating section, the inner molding section, the cooling section, etc. Considering the required time and its relationship, it has become possible to significantly reduce the manufacturing time per container to about 1/8 to 1/10 compared to conventional inner container manufacturing equipment. .
Moreover, according to the method for manufacturing the inner container with the multilayer structure in the first embodiment, although the inner molding takes extra time, it is still less per unit than the conventional method for manufacturing the inner container with the multilayer structure. manufacturing time can be significantly shortened to about 1/10 to 1/20.

8. Inspection Unit It is preferable to provide an inspection unit to inspect the appearance, dimensions, internal volume, pressure resistance, etc. of the inner container after the inner container is taken out from the inside.
That is, it is preferable to visually inspect the appearance of the inner container to evaluate and confirm whether uniformity is maintained.
Moreover, it is preferable to actually measure each dimension and internal volume of the inner container, and evaluate and confirm whether or not each value is within a predetermined range.
Furthermore, the pressure resistance of the inner container is set to a liquid temperature within the range of 50 to 60 ° C., and a tester or the like is used to adjust the gauge pressure within the range of 20 to 40 MPa and pour water, assuming that there is no leakage. , it is preferable to evaluate and confirm whether or not it is within the specification standards.

[Second embodiment]
Used for a liquid hydrogen container using an inner container manufacturing apparatus according to the second embodiment, which includes at least a mold heating section, an inner molding section, and a cooling section. A method for manufacturing an inner container, characterized by comprising the following steps (1) to (3).
(1) A step of heating a cylindrical mold in a mold heating section and setting it to a predetermined temperature while rotating it with a rotating device. (3) A step of rotating and cooling the cylindrical mold in the cooling section to mold the inner container derived from the resin injected by the resin injection device while rocking. Each step constituting the method will be specifically described with reference to the drawings as appropriate.

1. Mold Preparing Step The mold preparing step is a step of preparing a predetermined cylindrical mold before carrying out the step (1), as shown in step S1 in FIG.
Then, it is preferable to mount a predetermined cylindrical mold 14 on the upper portion of the predetermined base 10 using a predetermined jig at the mold mounting portion indicated by A' in FIG.
More specifically, it is preferable to use a crane, chain block, air hoist, jack, robot, or the like as the predetermined jig.
The reason for this is that the cylindrical mold 14 can be quickly and easily mounted on the upper part of the predetermined mount 10 .

2. Step (1) (heating step of cylindrical mold)
In step (1), as shown in step S2 in FIG. 8, the cylindrical mold is heated in the mold heating unit, and the cylindrical mold is heated to a predetermined temperature while being rotated by a predetermined rotating device. This is a heating step (which may also include a preheating step).
That is, using a flame burner (line burner), an electric heater, or the like as a predetermined heating device 25, the inner surface temperature of the cylindrical mold is heated to a range of 180 to 250° C., depending on the type and melting point of the forming resin. It is preferable to heat in the range of 190 to 245°C, more preferably in the range of 200 to 240°C.

In addition, when the mold heating unit is configured by using both the main heating unit and the preheating unit, the inner surface temperature of the cylindrical mold during main heating is in the range of 180 to 250 ° C. is preferably adjusted to
On the other hand, when performing the preheating step by the preheating unit before the main heating, the inner surface temperature of the cylindrical mold at that time is preferably adjusted to a range of 100 to less than 180 ° C., 120 to It is more preferable to adjust the temperature in the range of 160°C, and more preferably in the range of 130 to 150°C.

3. Step (2) (inner molding step)
In the step (2), as shown in steps S3 to S4 in FIG. 8, the cylindrical mold is rotated in the inner molding section and is rotated horizontally, that is, at a predetermined angle with respect to the horizontal direction. This is a step of molding the inner container derived from the molding resin while repeating the operation of tilting the end portion up and down so as to form a so-called rocking motion.
Therefore, in the inner molding section, it can be said that the molding of the inner container derived from the forming resin in the step (2) is simultaneously carried out while rotating the cylindrical mold by means of a predetermined rotating device.
At this time, it is preferable to mold the inner container in a state in which the surface temperature is set to a predetermined temperature by heating the cylindrical mold with a heating device while rotating the cylindrical mold.
Furthermore, it is also possible to sequentially supply a plurality of forming resins using a plurality of resin injection devices to perform inner molding of a multi-layer structure.
In molding the inner container, as a total efficient mode, the time of step (2) should be set to a predetermined time, which should be substantially the same as the total cooling time of step (3), which will be described later. preferable.

4. Step (3) (cooling step)
Step (3) is a step of cooling the cylindrical mold to a predetermined temperature while rotating it in the cooling unit, as shown in step S5 in FIG.
That is, for example, in the inner molding section, it is preferable to carry out the step (3) while rotating the cylindrical mold with a predetermined rotating device, followed by air cooling.
In forming the inner container, as a total efficient mode, the time of the step (3) should be set to a predetermined time, which should be substantially the same as the total time of the cooling time of the above-described step (2). preferable.
Further, when the cooling unit is divided into a plurality of sections along the traveling direction D1 (see FIG. 1), it is preferable to proceed to the next section in a predetermined time divided by the number of divided sections.
Therefore, for example, when the cooling section is divided into five sections as shown in FIG. 1, it is preferable that the time for advancing one section in the cooling section is ⅕ of the predetermined time.
The reason for this is that even if the cooling time is longer than the predetermined time, the cylindrical mold conveyed from the previous process can be received without staying, and one inner container can be used. This is because it is possible to effectively prevent the manufacturing time from becoming long.

5. Step (4) (Step of removing the inner container)
Step (4), as shown in step S6 in FIG. 8, is a step of demolding the inner container from the inside of the cylindrical mold cooled to a predetermined temperature in the demolding section and taking it out to the outside. .
That is, it is preferable to open the hatch of the cylindrical mold, remove the inner container from the mold, take it out, and mount it on a predetermined frame so that it can be easily handled.

6. Other step 1 (step of forming fiber reinforced resin layer)
Further, it is preferable to carry out the step of forming the fiber reinforced resin layer as a post-process after performing the steps (1) to (4).
That is, as shown in step S7 in FIG. 8, as another step 1, it is preferable to perform a step of forming a fiber-reinforced resin layer on the outside of the inner container.

For example, the inner container is impregnated with epoxy resin by a filament winding molding method (FW method), and carbon fiber is wound in a pattern combining helical winding and hoop winding to obtain an uncured carbon fiber plastic. form a layer.
Next, it is preferable to form the fiber-reinforced resin layer by heat-treating the inner container on which the carbon fiber plastic layer is formed to cure the carbon fiber plastic layer.
The reason for this is that by carrying out in this way, the inner container can be made lighter and more durable.

7. Other process 2 (reuse process)
Further, as shown in step S8 in FIG. 8, after the inner container is taken out from the inside, the used cylindrical mold is placed on the predetermined frame 12 in the demolding section so as to be reused repeatedly. It is preferable to transfer to the mold mounting section and move to the mold preparation step.
That is, after removing the inner container from the inside of the cylindrical mold, the used cylindrical mold is preferably reused at least 2 to 10 times.
Therefore, it is preferable to repeat the cleaning process, the repairing process, and the process of applying a releasing agent to the inside of the cylindrical mold during the process.

8. Other process 3 (inspection process)
Next, although not shown, it is preferable to carry out another step 3 to inspect the appearance, dimensions, internal volume, pressure resistance, etc. of the inner container after removing the inner container from the inside.
That is, it is preferable to inspect whether or not the inner container conforms to the predetermined specifications by performing a 100% inspection or a random inspection.
Further, according to the method of manufacturing the inner container of the second embodiment, the cylindrical mold is rotated using the rotating device to manufacture the inner container derived from the forming resin. It has been found that even an inner container used for a liquid hydrogen container having a complicated shape can be formed very easily and in a short time (approximately 30 to 60 minutes/piece).

Therefore, according to the method for manufacturing the inner container (single-layer structure) of the second embodiment, the manufacturing time for each container is reduced to about 1/8 to 1/10 of the conventional method for manufacturing the inner container. can be significantly shortened.
Moreover, according to the method for manufacturing the inner container of the second embodiment, in the case of the inner container having a multilayer structure, it takes extra time for inner molding, but it is compared with the conventional method for manufacturing an inner container having a multilayer structure. Even so, the manufacturing time per piece can be further shortened to about 1/10 to 1/20.

According to the apparatus for manufacturing the inner container used for the liquid hydrogen container and the method for manufacturing such an inner container according to the present invention, the cylindrical mold is rotated and periodically or irregularly shaken using the rotating device. By manufacturing an inner container derived from a fixed amount of forming resin while moving, even an inner container used for a liquid hydrogen container with a large size and a complicated shape can be manufactured very simply and in a short time. became able to form.

In addition, by appropriately increasing the types of forming resins that are supplied in fixed amounts, even a multi-layered inner container can be formed very easily and in a short period of time.
That is, the inner container of the present invention is suitable for large and complicated liquid hydrogen containers mounted on various automobiles (including not only passenger cars but also trucks, buses, etc.) And it has become possible to manufacture with high precision.

Furthermore, the inner container of the present invention can be used for various applications other than liquid hydrogen containers, such as large storage tanks such as various liquid storage tanks, box-shaped storage containers, and hulls such as boats and kayaks. There is expected.

1: Inner container manufacturing device 2: Mold heating device 4: Inner molding device 6: Resin injection device 8: Mold cooling device 10: Predetermined base 12: Predetermined base 14: Cylindrical mold 16: Inner container 17: Liquid Hydrogen containers 21, 41: Predetermined frames 23, 43: Conveying device 25: Heating devices 27, 47: Rotating device 42: Rocking device A part: Mold heating part A' part: Mold mounting part B part: Inner molding part Part C: Cooling part C' part: Demolding part D1: Moving direction of cylindrical mold θ: Swing angle

Claims (8)

A manufacturing apparatus for an inner container used for a liquid hydrogen container, which manufactures an inner container derived from a forming resin while rotating a cylindrical mold using a rotating device,
comprising at least a mold heating section, an inner molding section, and a cooling section;
An apparatus for manufacturing an inner container, wherein the inner molding unit is provided with a swinging device for swinging the cylindrical mold in the left-right direction while being rotated by the rotating device. 2. The apparatus for manufacturing an inner container according to claim 1, wherein the inner molding section is provided with at least one resin injection device for injecting the forming resin into the cylindrical mold. The rotating device is characterized by comprising a rotating mechanism that rotates the cylindrical mold by inserting a wheel into a groove provided on the surface of the cylindrical mold and rotating the wheel. The apparatus for manufacturing an inner container according to claim 1 or 2. 4. The mold heating section, the inner molding section, and the cooling section, each of which has a mold expelling member for moving the cylindrical mold forward. The apparatus for manufacturing an inner container according to any one of 1 to 3. At least one mold cooling device for rotating and cooling the cylindrical mold by inserting wheels into grooves provided on the surface of the cylindrical mold in the cooling unit and rotating the wheels. 5. The apparatus for manufacturing an inner container according to any one of claims 1 to 4, characterized by comprising: The apparatus for manufacturing an inner container according to any one of claims 1 to 5, wherein the mold heating section comprises a preheating section and a main heating section. A method for manufacturing an inner container used for a liquid hydrogen container, using an inner container manufacturing apparatus having at least a mold heating section, an inner molding section, and a cooling section, comprising the following steps (1) to (3): ). A method for manufacturing an inner container, characterized by having
(1) A step of heating a cylindrical mold in the mold heating unit to a predetermined temperature while rotating it with a rotating device (2) Rotating the cylindrical mold in the inner molding unit, Step (3): Molding the inner container derived from the injected molding resin while rocking it in the horizontal direction; (3) Cooling the cylindrical mold while rotating it in the cooling unit; 8. The method of manufacturing an inner container according to claim 7, wherein at least one or more resin injection devices are provided in the inner molding portion, and the resin injection device is used to inject a fixed amount of the forming resin. .

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