Apparatus, method for forming hydrogen tank, and method of assembling same

Abstract

There is provided an embodiment of a replacement core module for an injection mold for an injection molded hydrogen tank liner, the replacement core module including an upper replacement core and a lower replacement core configured to hold a seamless nozzle within the injection mold, and an induction heating unit configured to heat the upper replacement core and the lower replacement core, the injection mold comprises an upper mold plate and a lower mold plate, and wherein the seamless nozzle has a first temperature; the induction heating unit is configured to inductively heat the seamless nozzle to a second temperature.

Description

Technical Field

[0001] The present invention relates to an apparatus and method for forming a hydrogen tank and an assembly method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute known prior art.

[0003] The outer shell of a hydrogen tank for a hydrogen electric vehicle can be reinforced with a fiber-reinforced composite material with high specific strength and specific stiffness to withstand the internal pressure of the compressed gas, and a liner can be inserted into the hydrogen tank to seal the gas.

[0004] Furthermore, when the inner liner of a hydrogen tank is made of a plastic material such as a high-density polymer, a metal nozzle may be applied to connect an external valve to the hydrogen tank, and since the plastic liner and the metal nozzle are made of different materials, it may be difficult to achieve good adhesion at their interface.

[0005] Specifically, Figure 1 , Figure 2 As shown, in order to better seal the hydrogen at the interface between the plastic liner 2 and the aluminum nozzle 3 of the hydrogen tank 1 for a hydrogen-powered vehicle, a separate highly elastic O-ring or annular dedicated seals 4, 5 can be used on the hydrogen tank.

[0006] Here, since hydrogen molecules are very small, even if various types of highly elastic O-rings or special annular seals 4, 5 are used, hydrogen may still leak through the gap formed at the interface between the plastic liner 2 and the aluminum nozzle 3 under high pressure.

[0007] Furthermore, the annular dedicated seals 4, 5 are expensive, and since the annular dedicated seals 4, 5 must be assembled manually on the injection-molded plastic liner 2, excessive man-hours are required.

[0008] In order to solve the above technical problems, Figure 3 As shown, the plastic liner 11 and the seamless aluminum nozzle 10 can be bonded and formed to form an interface joint 12, so that hydrogen can be sealed at the interface.

[0009] like Figure 4A-4C As shown, the bonding and molding process can be: Figure 4A In the steps shown, the seamless aluminum nozzle 10 is placed in an oven 20 and heated to 170°C. Figure 4B In the step shown, the seamless aluminum nozzle 10 heated to 170°C is transported, and Figure 4C In the steps shown, the transported seamless aluminum nozzle 10 is inserted into the liner injection molding machine 21 to perform insert injection molding of the liner.

[0010] However, in the case of the above-mentioned injection molding method, the aluminum nozzle 10 may be cooled to a temperature lower than a desired temperature during the process of taking the seamless aluminum nozzle 10 out of the furnace 20 and inserting it into the liner injection molding machine 21 .

[0011] In particular, when the seamless aluminum nozzle 10 is injection molded with the liner at a temperature of about 160° C. or less, the bonding strength at the interface joint 12 may be reduced and the hydrogen tightness may be reduced.

[0012] Furthermore, in the case of the above-mentioned injection molding method, Figure 4B In the steps shown, workers may face the risk of safety accidents during the process of transporting the seamless aluminum nozzle 10 heated to 170°C.

[0013] also, Figure 4A The process of heating the nozzle, Figure 4B The process of transporting the heating nozzle, Figure 4C Inserting a heated nozzle into the process, for example, may excessively increase the total cycle time required to produce the product.

[0014] Furthermore, the seamless aluminum nozzle 10 can be produced in a variety of designs, and each time each design is molded, the replacement core needs to be replaced with a replacement core that matches the design.

[0015] For example, Figure 5 As shown, in order to perform insert injection of the A-type seamless nozzle on the injection mold and then perform insert injection of the B-type seamless nozzle, the injection work is stopped, the A-type upper and lower replacement cores are separated from the injection mold, the B-type upper and lower replacement cores are assembled into the injection mold, and the B-type seamless nozzle is inserted for injection. Therefore, it may take at least one hour to replace the replacement core, resulting in a decrease in productivity.

[0016] The information contained in this Background section is only for enhancement of understanding of the general background of the embodiments of the disclosure and should not be taken as an acknowledgment or any form of suggestion that this information constitutes known prior art. Summary of the invention

[0017] The present disclosure relates to an apparatus and method for forming a hydrogen tank and an assembly method thereof. Embodiments relate to an injection mold for a hydrogen tank liner, and specific embodiments relate to a replacement core module for an injection mold for a hydrogen tank and a coupling device thereof, wherein a plastic liner of the hydrogen tank is injection molded while heating a seamless aluminum nozzle to completely seal hydrogen at an interface between the plastic liner and the seamless aluminum nozzle.

[0018] The embodiments of the present disclosure can solve the problems arising in the prior art.

[0019] Embodiments of the present disclosure provide a replacement core module for an injection mold of a hydrogen tank, wherein a seamless aluminum nozzle inserted into the injection mold may be heated to a temperature of about 160° C. or higher by induction heating the replacement core.

[0020] In addition, an embodiment of the present disclosure provides a replacement core module coupling device for an injection mold of a hydrogen tank, which is used to combine or separate the replacement core module to easily replace the replacement core module including an upper replacement core and a lower replacement core and a seamless aluminum nozzle inserted therebetween.

[0021] According to an embodiment of the present invention, a replacement core module of an injection mold for a hydrogen tank liner may include an upper replacement core module and a lower replacement core module that hold a seamless nozzle inside the injection mold, and an induction heating unit configured as an induction heating insert sealless nozzle, wherein the hydrogen tank liner is injection molded by the seamless nozzle positioned in the injection mold through the replacement core module, and wherein the injection mold includes an upper mold plate and a lower mold plate.

[0022] The distance d between the induction heating unit and the inserted seamless nozzle may be about 10 to 15 mm.

[0023] The induction heating unit may heat the insert type seamless nozzle to a temperature of about 160° C. or higher.

[0024] The induction heating unit may arrange the coils in parallel.

[0025] The induction heating unit may arrange the coils into two or more parallel channels.

[0026] Two or more parallel channels can form a zigzag curve.

[0027] The coils of the induction heating unit may be arranged so that there is no change in the vector of the current flow.

[0028] When the temperature of the inserted seamless nozzle is about 160° C. or higher as measured through the induction heating inlet line to which the induction heating unit has been energized, the molding of the liner may begin with the injection of the resin.

[0029] A replacement core module connecting device for an injection mold of a hydrogen tank liner, wherein the hydrogen tank liner is injection molded by a seamless nozzle positioned in the injection mold through an upper replacement core and a lower replacement core, and wherein the injection mold includes an upper mold plate and a lower mold plate, and may include a horizontally movable pin and a vertically movable pin, wherein the horizontally movable pin is configured to be built into the lower replacement core and horizontally moved by a push rod on a bottom plate, and the vertically movable pin is configured to be built into the lower replacement core, vertically moved by the horizontally movable pin, and inserted into a connecting hole of the upper replacement core.

[0030] The driving inclined surface of the horizontal moving pin and the driven inclined surface of the vertical moving pin may correspond to each other to slide.

[0031] The vertically movable pin may be elastically supported by a compression spring.

[0032] The vertical moving pin can be radially embedded in the lower replacement core and can move radially along the lower replacement core.

[0033] A slot hole may be formed at a top end of the vertical moving pin.

[0034] The upper replacement core is provided with a built-in slit strip which radially penetrates the connection hole thereof.

[0035] When the slot of the vertical moving pin is inserted into the coupling hole, the slit bar can pass through the slot to fix the vertical moving pin.

[0036] The replacement core module and its connecting device of the injection mold for hydrogen tanks according to the embodiment of the present invention have practical effects, namely, they can improve the bonding strength between the plastic liner and the seamless aluminum nozzle interface, achieve better hydrogen sealing, and facilitate the replacement core, thereby significantly improving the work efficiency and production efficiency of injection molding.

[0037] The methods and apparatus of the embodiments of the present disclosure have other features and advantages that will be apparent from or set forth in more detail in the accompanying drawings, which are incorporated herein, and the following detailed description, which together serve to explain certain principles of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 and Figure 2 is a cross-sectional view for illustrating a nozzle portion of a hydrogen tank.

[0039] Figure 3 It is a cross-sectional view for showing the seamless nozzle portion of the hydrogen tank.

[0040] Figure 4A-4C is a schematic diagram for illustrating a process of inserting a seamless nozzle into an injection mold for a hydrogen tank.

[0041] Figure 5 is a partial cross-sectional view for illustrating the structure of an upper replacement core and a lower replacement core of a seamless nozzle insert of an injection mold for a hydrogen tank.

[0042] Figure 6 and Figure 7 is a view for illustrating a replacement core module of an injection mold for a hydrogen tank according to an embodiment of the present invention.

[0043] Figures 8 to 14 1 is a view for illustrating an experimental example of an induction heating unit of a replacement core module of an injection mold for a hydrogen tank according to an embodiment of the present invention.

[0044] Fig.15 and Fig.16 is a view showing an induction heating unit of a replacement core module of an injection mold for a hydrogen tank according to the present invention.

[0045] Figures 17 to 21 is a view showing a replacement core module coupling device of an injection mold for a hydrogen tank according to the present invention.

[0046] It is to be understood that the drawings are not necessarily drawn to scale, but rather represent various features illustrating the basic principles of the embodiments of the present disclosure in a somewhat simplified manner. The specific design features of the embodiments of the present disclosure included herein, including, for example, specific dimensions, directions, locations, and shapes, will be determined in part by the specific intended application and use environment.

[0047] In the drawings, like reference numerals refer to the same or equivalent parts of the embodiments of the present disclosure throughout the several figures of the drawing. DETAILED DESCRIPTION

[0048] Since the embodiments of the present disclosure can be variously changed, and the present disclosure can be implemented in a series of embodiments, specific embodiments will be shown and described in the accompanying drawings. However, this does not mean that the present disclosure is limited to specific embodiments, and it should be understood that the present disclosure includes all changes, equivalents and substitutions within the technology and scope of the present disclosure.

[0049] The terms "module" and "unit" used in the present disclosure are merely names for distinguishing components and should not be interpreted as assuming that the components have been physically or chemically separated or can be so separated.

[0050] Terms including ordinal numbers (such as "first" and "second") may be used to describe various components, but the components are not limited by these terms. The above terms are only used as names to distinguish one component from another, and the order between them can be determined by the context in their description rather than by these names.

[0051] The expression "and / or" is used to include all possible combinations of the plurality of items addressed. For example, "A and / or B" refers to all three possible combinations: "A", "B" and "A and B".

[0052] When it is said that a component is "coupled" or "connected" to another component, it means that the component may be directly coupled or connected to the other component, or there may be other components between them.

[0053] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. Expressions in the singular include the meaning of the plural form, unless they clearly indicate other meanings in the context. In the present disclosure, expressions such as "including" or "having" are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described herein, and should not be understood to exclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0054] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the meanings commonly understood by those of ordinary skill in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the present disclosure.

[0055] In addition, a unit, a control unit, a control device, or a controller is only a term widely used to name a device for controlling a certain function, and does not represent a general functional unit. For example, a device with these names may include a communication device that communicates with other controllers or sensors to control a certain function, a computer-readable recording medium that stores an operating system, logic instructions, input / output information, etc., and one or more processors that perform operations such as determination, calculation, decision-making, etc. required to control the function.

[0056] Meanwhile, the processor may include a semiconductor integrated circuit and / or an electronic device that performs at least one of comparison, determination, calculation, and decision making to perform a programmed function. For example, the processor may be any one or a combination of a computer, a microprocessor, a CPU, an ASIC, and an electronic circuit (e.g., a circuit and a logic circuit).

[0057] Examples of computer-readable recording media (or simply referred to as memories) may include all types of storage devices for storing data that can be read by a computer system. For example, they may include flash memory, hard disk, micro memory, card memory (such as a secure digital card (SD card) or an eXtream digital card (XD card)) and other memories, as well as random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), programmable ROM (PROM), electrically erasable PROM (EEPROM), magnetic random access memory (MRAM), magnetic disk, optical disk and other memories. At least one of the above.

[0058] Such a recording medium can be electrically connected to a processor, and the processor can load and write data from the recording medium. The recording medium and the processor can be integrated or physically separated.

[0059] Hereinafter, respective components in preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0060] Replacement core module

[0061] like Figure 6 As shown, the upper mold plate 42 and the lower mold plate 43 of the injection mold for the hydrogen tank according to the embodiment of the present invention can be vertically connected to each other, and the upper replacement core 50 and the lower replacement core 60 can be arranged between the upper and lower mold plates.

[0062] In addition, an upper mounting plate 40 may be formed on the upper portion of the upper mold plate 42 , and a top rod 46 supported by a bottom plate 45 may be formed in a space formed by a spacer block 44 between the lower mold plate 43 and the lower mounting plate 41 .

[0063] Specifically, the insertion type seamless nozzle 100 may be inserted between the upper replacement core 50 and the lower replacement core 60 , and the induction heating unit 70 may be built in the lower replacement core 60 .

[0064] In addition, the replacement core module 80 may include an upper replacement core 50 , a lower replacement core 60 , seamless nozzles 100 of various designs inserted between the upper replacement core 50 and the lower replacement core 60 , and an induction heating unit 70 built into the lower replacement core 60 .

[0065] A replacement core module 80 may be prepared for each plug-in type seamless nozzle 100 and formed to be simply and easily replaceable in an injection mold.

[0066] Induction heating unit

[0067] The induction heating unit 70 may be Figure 7 As shown, the insert type seamless nozzle 100 is built into the lower replacement core 60 , and the lower replacement core 60 can be heated to a temperature of about 160° C. or higher by induction heating.

[0068] Here, the induction heating unit 70 may perform induction heating to uniformly heat the entire surface of the insertion type seamless nozzle 100, so the method of arranging the coils may be most important.

[0069] Specifically, the distance d between the induction heating unit 70 and the insertion type seamless nozzle 100 may preferably be 10 to 15 mm.

[0070] Depending on the arrangement of the coils, there may be great differences in the heating variation, tendency, etc. of the insertion type seamless nozzle 100 by the induction heating unit 70 built into the lower replacement core 60 .

[0071] The embodiments of the present invention can obtain a preferred arrangement structure of the coils of the induction heating unit 70 through experimental design.

[0072] Experimental Example 1

[0073] In Experimental Example 1, the coil 71 can be Figure 8 In the series arrangement shown, the distance between the coil channels is approximately 50 mm.

[0074] Analysis of the heating trend of the coil 71 arrangement shows that Figure 8 In region A, the magnetic field may be strengthened because the current direction of the output unit is significantly different from the current direction of the internal coil.

[0075] exist Figure 8 In region B, which is an unheated area, the magnetic field is canceled due to the change in the current direction vector (0° / 180°), so it may not be heated at all, while region C may be heated because the current direction vector does not change.

[0076] Experimental Example 2

[0077] In Experimental Example 2, the coil 71 can be Fig. 9 In the series arrangement shown, the distance between the coil channels is approximately 35 mm.

[0078] Analysis of the heating trend of the coil 71 arrangement shows that Fig. 9 In region A, the magnetic field may be enhanced because the current direction of the output unit is significantly different from that of the internal coil.

[0079] exist Fig. 9 In region B, which is an unheated area, the magnetic field is canceled due to the change in the current direction vector (0° / 180°), so it may not be heated at all. Specifically, this area may be wider than region B in Experimental Example 1, while region C may be heated due to the lack of change in the current direction vector.

[0080] Experimental Example 3

[0081] In Experimental Example 3, the coil 71 can be Fig.10 In the series arrangement shown, the distance between the coil channels is approximately 25 mm.

[0082] Analysis of the heating trend of the coil 71 arrangement shows that Fig.10 In region A, the magnetic field may be enhanced because the current direction of the output unit is significantly different from that of the internal coil.

[0083] exist Fig.10In region B, which is an unheated area, the magnetic field is canceled due to the change in the current direction vector (0° / 180°), so it may not be heated at all. Specifically, region B may be wider than region B in Experimental Example 1, and region C may be heated because the current direction vector does not change.

[0084] Experimental results of coil series arrangement

[0085] By analyzing the heating trend of the structure in which the coils 71 are arranged in series in Experimental Examples 1 to 3, it can be seen that in region A, the change in the direction of the current applied to the adjacent coil channels may be about 180°, and no induction heating will occur on the plane, such as Fig.11 shown.

[0086] Furthermore, in the region B which is the unheated region, as the distance between adjacent coil paths becomes shorter, the unheated region may increase.

[0087] Experimental Example 4

[0088] In Experimental Example 4, Fig.12 As shown, the coils 71 can be arranged in parallel, and the two parallel channels can be arranged side by side in a straight line.

[0089] By analyzing the heating trend of the coil 71 parallel arrangement structure, it can be seen that Fig.12 Region A is the heating area, where the current direction vector may not change, and region B is the heating area, where heating may occur due to the increased magnetic field density due to the curved shape of the coil.

[0090] Region C is an unheated region and may not heat due to magnetic field cancellation caused by the change in current direction vector (0° / 180°).

[0091] Experimental Example 5

[0092] In Experimental Example 5, Fig.13 As shown, the coils 71 may be arranged in parallel, with two parallel channels forming a zigzag curve.

[0093] Analysis of the heating trend of the coil 71 parallel arrangement structure shows that: Fig.13 In the figure, region A is the heating area, and since only a single current flows, the vector may not change; and region B is the heating area, and since only a single current flows, the vector may not change.

[0094] Fig.13 In region C, which is the heating region, the magnetic field may be enhanced because the vector of the current direction does not change (0° / 0°).

[0095] Regions A, B, and C are all heated to a uniform temperature with no heating variation, so it can be considered that the arrangement of coil 71 is ideal.

[0096] Experimental Example 6

[0097] In Experimental Example 6, Fig.14 As shown, the coils 71 may be arranged in parallel and form a coil channel in the center.

[0098] The heating trend of the coil 71 parallel arrangement structure is analyzed, and it can be seen that Fig.14 In region A, which is the heating area, the current direction vector does not change and the magnetic field may be enhanced; in region B, since the current direction vector does not change (0° / 0°), the magnetic field may be enhanced.

[0099] exist Fig.14 In region C serving as the heating area, the change in the current direction vector (0° / 90°) may lead to an enhanced magnetic field. In region D serving as the local heating area, there may be both an enhanced magnetic field due to the change in the current direction vector (0° / 0°) and a cancelled magnetic field due to the change in the current direction vector (0° / 180°).

[0100] Experimental results of coils arranged in parallel

[0101] In Experimental Example 4, Fig.12 As shown, since the heated area and the unheated area can coexist, there may be differences in heating. In Experimental Example 6, as shown in Fig.14 As shown, since heated areas and localized heating areas can coexist, there may also be differences in heating.

[0102] Specifically, in Experimental Example 5, Fig.13 As shown, all areas are heated and the heated areas are heated to a uniform temperature without variation.

[0103] In summary, Experimental Example 5 can be regarded as an ideal example of the arrangement of the coil 71 of the induction heating unit 70 .

[0104] Induction Heating Process

[0105] like Fig.15 As shown, when the induction heating inlet pipeline 90 is energized in a state where the upper mold plate 42 and the lower mold plate 43 are closed, as the induction heating unit 70 is energized, the induction heating of the coil 71 begins, and the temperature of the inserted seamless nozzle 100 being heated can be measured by the induction heating inlet pipeline 90 connected to the temperature sensor (not shown).

[0106] In addition, when the insertion type seamless nozzle 100 is heated to a temperature of about 160° C. by the induction heating of the induction heating unit 70, as shown in FIG. Fig.16 As shown, while maintaining the induction heating temperature of the induction heating unit 70, resin can be injected through the space between the upper mold plate 42 and the lower mold plate 43 and the space between the upper replacement core 50 and the lower replacement core 60 to form a liner injection molded product 110 for a hydrogen tank.

[0107] Replacement core module connection device

[0108] like Figure 6 As shown, the replacement core module 80 may include an upper replacement core 50 and a lower replacement core 60 connected to each other and an insertable seamless nozzle 100; insertable seamless nozzles of various designs can be inserted into the replacement core module 80; and the replacement core module 80 can be replaced when the upper template 42 and the lower template 43 are closed.

[0109] Here, if Fig.17 As shown, the distance between the upper replacement core 50 and the lower replacement core 60 may be 3t to 4t, ie, the thickness of the liner injection molded product 110 for the hydrogen tank.

[0110] like Fig.17 As shown, in the replacement core module connecting device, when the four horizontal moving pins 61 move forward in the horizontal direction through the four top rods 46 of the bottom plate 45, the four vertical moving pins 63 can move radially along the lower replacement core 60 and be inserted into the connecting hole 51 of the upper replacement core 50.

[0111] Here, the replacement core module coupling device may be designed to couple the upper replacement core 50 with the lower replacement core 60 by inserting the four vertical movement pins 63 into the coupling holes 51 of the upper replacement core 50 while the four horizontal movement pins 61 move forward in the horizontal direction.

[0112] More specifically, if Fig.18 As shown, when the core replacement module connecting device drives the push rod 46 to move the horizontal moving pin 61 forward, the driving inclined surface 62 can slide along the driven inclined surface 64, thereby pushing the vertical moving pin 63 upward.

[0113] Here, in the replacement core module coupling device, four vertical moving pins 63 may be provided in the lower replacement core 60 in the radial direction and may be designed to move in the radial direction.

[0114] Specifically, the four vertical moving pins 63 may be vertically and elastically movable under the support of the compression springs 66 , and may be designed to compress the compression springs 66 when vertically moved by the horizontal moving pins 61 .

[0115] When the vertical moving pin 63 vertically and elastically moves and extends out of the outer surface of the lower replacement core 60 to be inserted into the coupling hole 51 of the upper replacement core 50 , the slit rod 55 may pass through the slot hole 65 of the vertical moving pin 63 .

[0116] In other words, when the vertical moving pin 63 moves vertically and elastically and the slot 65 is inserted into the connecting hole 51 of the upper replacement core 50, the magnetic force of the first driving unit 52 built into the upper replacement core 50 can act on the slit rod 55 through the slot 65 and pull the slit rod through the slot 65.

[0117] The first driving unit 52 may be an electromagnet unit, and may be designed to drive the slit rod 55 by generating an attractive force to pull the slit rod 55 or a repulsive force to push it.

[0118] In this way, when the slit rod 55 passes through the slot hole 65 and supports the vertical moving pin 63, even if the horizontal moving pin 61 is removed, the vertical moving pin 63 can continue to be inserted into the connecting hole 51 of the upper replacement core 50 despite the compression elastic force of the compression spring 66.

[0119] like Fig.19 As shown, in the replacement core module coupling device, when the slit rod 55 moves backward and escapes from the slot hole 65 , the vertical moving pin 63 can be vertically moved by the compression elastic force of the compression spring 66 .

[0120] Here, the driven slope 64 of the vertical moving pin 63 may press the driving slope 62 downward, so that the driving slope 62 may move the horizontal moving pin 61 backward while sliding along the driven slope 64 .

[0121] In addition, if Fig. 20 As shown, in the replacement core module coupling device, the second driving unit 53 can drive the slit rod 55 to move along the slot hole 65 .

[0122] The second driving unit 53 may be a hydraulic cylinder or a pneumatic cylinder, and the rod of the hydraulic cylinder or the pneumatic cylinder may be connected to the slit rod 55 to move the slit rod forward and backward.

[0123] At the same time, for the process of replacing the replacement core module, such as Fig.21 As shown, since the horizontal moving pin 61 can cause the vertical moving pin 63 to move vertically, the slit rod 55 of the first driving unit 52 and the second driving unit 53 can continue to be inserted into the connecting hole 51 of the upper replacement core 50 through the slot 65, so that the upper replacement core 50 and the lower replacement core 60 of the replacement core module 80 can be connected to each other.

[0124] The upper replacement core 50 and the lower replacement core 60 of the replacement core module 80 to be replaced can be connected to each other by the vertical moving pin 63 as described above, and after the replacement core module installed on the injection mold is simply removed from the injection mold using the lifting unit, another replacement core module can be easily inserted into the injection mold using the lifting unit.

[0125] Here, if Fig.19 As shown, when the slit rod 55 of the replacement core module 80 inserted into the injection mold moves backward and separates from the slot hole 65, the upper replacement core 50 and the lower replacement core 60 can be separated as the vertical moving pin 63 comes out of the coupling hole 51 of the upper replacement core 50. In this state, the injection mold can be opened to start molding work.

[0126] Therefore, according to an embodiment of the present disclosure, the replacement core module 80 may be replaced without stopping the injection work or disassembling the injection mold, thereby improving the work efficiency and productivity of the injection molding.

[0127] The preferred embodiments of the present disclosure have been reviewed, and it is obvious to those skilled in the art that the present disclosure may be implemented in other specific forms in addition to the above embodiments. Therefore, the above embodiments should be regarded as illustrative rather than restrictive, and the present disclosure is not limited to the description, but may be modified within the scope of the appended claims and their equivalents.

[0128] The foregoing descriptions of specific exemplary embodiments of the present disclosure are for purposes of description and illustration. They are not intended to be exhaustive or to limit the present disclosure to the precise form disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The exemplary embodiments are selected and described to explain certain principles of the embodiments of the present disclosure and their practical applications, so that other persons skilled in the art can make and utilize various exemplary embodiments of the present disclosure and various alternatives and modifications thereof. The scope of the present disclosure is intended to be defined by the appended claims and their equivalents.

Claims

1. A replacement core module for an injection mold of an injection-molded hydrogen tank liner, the replacement core module comprising: an upper replacement core and a lower replacement core configured to hold a seamless nozzle within an injection mold, wherein the injection mold includes an upper mold plate and a lower mold plate, and the seamless nozzle has a first temperature; and An induction heating unit is configured to induction heat the seamless nozzle to a second temperature. 2 . The replacement core module according to claim 1 , wherein a distance between the induction heating unit and the seamless nozzle is 10 to 15 mm. The replacement core module according to claim 1 , wherein the second temperature is 160° C. or higher.

4. The replacement core module of claim 3 , wherein in a state where the seamless nozzle is at a second temperature, wherein the second temperature is measured by an induction heating inlet line configured to supply power to the induction heating unit, the liner is configured to be molded by a resin injected through a space between the upper mold plate and the lower mold plate and a space between the upper replacement core and the lower replacement core. The replacement core module of claim 1 , wherein the induction heating unit comprises coils arranged in parallel. 6 . The replacement core module according to claim 5 , wherein the coil of the induction heating unit is arranged so that a vector of current flow does not change. 7 . The replacement core module of claim 1 , wherein the induction heating unit comprises coils arranged in two or more parallel channels.

8. The replacement core module of claim 7, wherein the two or more parallel channels form a zigzag curve.

9. A replacement core module coupling device for an injection mold for a hydrogen tank liner, the hydrogen tank liner being injection molded by a seamless nozzle positioned in the injection mold through an upper replacement core and a lower replacement core, wherein the injection mold comprises an upper mold plate and a lower mold plate, the replacement core module coupling device comprising: A horizontal moving pin configured to be built into the lower replacement core and to be horizontally moved by a push rod on the bottom plate; and A vertical moving pin is configured to be built into the lower replacement core, vertically moved by the horizontal moving pin, and inserted into the coupling hole of the upper replacement core. 10 . The replacement core module coupling device according to claim 9 , wherein the driving inclined surface of the horizontal moving pin and the driven inclined surface of the vertical moving pin slide corresponding to each other. 11 . The replacement core module coupling device according to claim 9 , wherein the vertical moving pin is elastically supported by a compression spring. 12 . The replacement core module coupling device according to claim 9 , wherein the vertical moving pin is radially embedded in the lower replacement core and moves in the radial direction of the lower replacement core.

13. The replacement core module coupling device according to claim 9, wherein a slot hole is provided at a top of the vertical moving pin. 14 . The replacement core module coupling device according to claim 13 , wherein the upper replacement core has a built-in slit rod passing through the coupling hole in a radial direction. 15 . The replacement core module coupling device according to claim 14 , wherein in a state in which the slot hole of the vertical moving pin is inserted into the coupling hole, the built-in slit rod passes through the slot hole to fix the vertical moving pin.

16. A method for forming a hydrogen tank liner, the method comprising the steps of: positioning a seamless nozzle within an injection mold including an upper mold plate and a lower mold plate using a replacement core module, the replacement core module including an upper replacement core and a lower replacement core that retain the seamless nozzle within the injection mold; and The seamless nozzle is inductively heated from a first temperature to a second temperature using an induction heating unit of the replacement core module. 17 . The method according to claim 16 , wherein the distance between the induction heating unit and the seamless nozzle is 10 to 15 mm.

18. The method of claim 16, wherein the second temperature is 160°C or higher.

19. The method according to claim 18, further comprising: After the seamless nozzle is inductively heated to the second temperature, resin is injected through the space between the upper mold plate and the lower mold plate and the space between the upper replacement core and the lower replacement core to start molding a liner injection molded product.

20. The method of claim 16, wherein the induction heating unit comprises coils arranged in parallel.

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