Forming production method of high-capacity hydrogen cylinder liner

Abstract

The invention discloses a forming production method of a high-capacity hydrogen cylinder inner container. The forming production method comprises the steps that a wafer serves as a base material and is formed into a second cup-shaped body blank after being stretched; the second cup-shaped body blank is spun to form a third cup-shaped body blank, and the length and the thickness of the third cup-shaped body blank meet the design requirements; the opening side of the third cup-shaped body blank is cut, so that the end face of the third cup-shaped body blank is smooth; cleaning the third cup-shaped body blank; the opening side of the third cup-shaped body blank is subjected to closing-in treatment to form the overall shape of the inner container; the end face of the inner container is flattened by cutting the end of the inner container at the closing position; liner heat treatment; and cleaning the inner container. The cup-shaped body blank is formed by taking the wafer as the base material through one or more times of stretching, the inner container is formed by combining the spinning and necking process, the operation of correcting the wall thickness through machining after the inner container is formed is canceled, the integrity of the inner container is kept, and the use safety is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydrogen cylinder production, in particular to a forming production method of a large-capacity hydrogen cylinder liner. BACKGROUND

[0002] Hydrogen energy is one of the energy sources that can be developed as a secondary clean energy. Hydrogen is in a liquid form at low temperature and high pressure, can be stored by using a high-pressure cylinder, and can be used as a power energy. However, the container for storing liquid hydrogen has higher requirements for safety.

[0003] In the production process of the existing hydrogen cylinder liner, an aluminum ingot is generally extruded into a cup-shaped body through a stamping device, for example, a "large-capacity hydrogen storage cylinder aluminum alloy liner stamping method and deep drawing die" disclosed in the invention patent with the publication number CN115382984A. The aluminum ingot is heated and formed into a cup-shaped body through multiple stamping. In order to control the thickness of the liner, a machining process is generally required in the later stage. This production method is prone to damage the integrity of the liner, especially in the production process of the liner of a large-capacity bottle, the liner produced by this production method has certain hydrogen storage safety hazards. SUMMARY

[0004] In order to improve the integrity in the forming process of the liner, the application provides a forming production method of a large-capacity hydrogen cylinder liner.

[0005] The forming production method of the large-capacity hydrogen cylinder liner provided by the application adopts the following technical scheme: A forming production method of a large-capacity hydrogen cylinder liner, comprising the following steps: Step 1, forming a second cup-shaped body blank by stretching a round sheet as a base material; Step 2, forming a third cup-shaped body blank by spinning the second cup-shaped body blank so that the length and thickness meet the design requirements; Step 3, cutting the opening side of the third cup-shaped body blank to make the end face flat; Step 4, cleaning the third cup-shaped body blank; Step 5, closing the opening side of the third cup-shaped body blank to form the overall shape of the liner; Step 6, cutting the head of the liner at the closing position to make the end face flat; Step 7, heat treating the liner; Step 8, cleaning the liner.

[0006] Preferably, step 1 comprises: Step 1-1, forming a first cup-shaped body blank by first stretching the round sheet; Step 1-2, tempering the first cup-shaped body blank; Step 1-3, the first cup-shaped body blank is stretched for the second time to increase the overall height and reduce the thickness to form a second cup-shaped body blank.

[0007] Preferably, in step 1-1, the disc is positioned between the first upper die and the first lower die, the first upper die has a first forming hole, the first lower die has a first displacement hole, the first punch is arranged in the first displacement hole of the first lower die, the first upper die is lowered and pushes the first lower die to be lowered, and at the same time, the first punch is raised to extrude the disc and make the disc gradually pass through the first forming hole to form the first cup-shaped body blank. In step 1-3, the opening side of the first cup-shaped body blank is placed on the second punch, the second upper die has a second forming hole, the second lower die has a second displacement hole, the second punch is arranged in the second displacement hole, the second upper die is lowered and the second punch is raised at the same time to extrude the first cup-shaped body blank and make the first cup-shaped body blank gradually pass through the second forming hole to form the second cup-shaped body blank, and the diameter of the second forming hole is smaller than that of the first forming hole.

[0008] Preferably, in step 1, the disc is positioned between the third upper die and the third lower die, the third upper die has a third forming hole and a fourth forming hole in the vertical direction, the third lower die has a third displacement hole, the third punch is arranged in the displacement hole of the third lower die, the third upper die is lowered and drives the third lower die to be lowered, and at the same time, the third punch is raised to extrude the disc and make the disc pass through the third forming hole to form the first cup-shaped body blank and pass through the fourth forming hole to form the second cup-shaped body blank, and the diameter of the fourth forming hole is smaller than that of the third forming hole; wherein, the third upper die is provided with a heating pipe at the outer edge of the third forming hole, and the heating pipe works to heat the first cup-shaped body blank formed during the process of the disc passing through the third forming hole.

[0009] Preferably, in step 1, the two surfaces of the disc are coated with stretching oil before stretching Preferably, in step 7, the heat treatment is a solid solution heat treatment, the disc material is an aluminum alloy, the heating temperature in the solid solution furnace is between 525±10℃, the temperature reaches 525℃, and the holding time is 120±15min, after the holding is completed, the inner container is transferred into the cooling water from the solid solution furnace, the transfer time from the furnace to the cooling water is not more than 10s, the cooling water temperature is between 15-45℃, and the cooling soaking time is not less than 10min.

[0010] Preferably, the solid solution furnace is of a lower opening structure, and the cooling water tank is arranged below the opening of the solid solution furnace when the inner container is cooled, and the inner container is directly lifted into the cooling water tank after being taken out of the solid solution furnace.

[0011] Preferably, the plurality of inner containers are installed into the stainless steel frame, the stainless steel frame is hoisted into the solution furnace as a whole, and the stainless steel frame is immersed into the cooling water tank as a whole when cooling; wherein, when the inner container is immersed into the cooling water tank, the bottle mouth is downwardly entered so that the cooling water can quickly enter the inner cavity of the inner container.

[0012] Preferably, the stainless steel frame comprises a plurality of limiting stations, and the limiting station comprises a U-shaped communication pipe; when the inner container is installed in the limiting station, the pressing plate is in contact with one end surface of the inner container opposite to the bottle mouth, one end of the communication pipe extends into the inner cavity from the opening of the inner container, and the other end of the communication pipe is always above the liquid level of the cooling water tank when the stainless steel frame is immersed into the cooling water tank.

[0013] Preferably, the one end of the communication pipe inserted into the inner container is not less than 1 / 2 of the height of the entire inner container, and the ratio of the pipe diameter of the communication pipe inserted into the inner container to the aperture diameter of the inner container bottle mouth is between 1:5 and 1:8.

[0014] In summary, the present application has at least one of the following beneficial technical effects: 1. By using a round sheet as a base material and adopting one or more stretching forming processes to form a cup-shaped body blank, and combining spinning and necking processes to form an inner container, the operation of machining and correcting the wall thickness of the inner container after forming is cancelled, the integrity of the inner container is maintained, and the use safety is improved. 2. By using a lower door type solution furnace structure for the solution treatment of the aluminum alloy material inner container, the inner container can be quickly water-cooled; the purpose of fast cooling is to freeze the single-phase solid solution, so as to avoid the early precipitation of solute atoms; at the same time, when the inner container is immersed into water, the bottle mouth is downwardly entered, and the communication pipe structure is combined to enable the inner and outer walls of the inner container to be simultaneously water-cooled, so as to reduce the excessive temperature difference between the inner and outer walls, thereby avoiding the imbalance of thermal stress, reducing the tensile stress caused by the outer shrinkage and inner expansion, and further improving the integrity of the inner container. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a process schematic diagram of the round sheet in the first stretching process in the first embodiment; Figure 2 It is a process schematic diagram of the cup-shaped body blank in the second stretching process in the first embodiment; Figure 3 It is a process process diagram of the cup-shaped body blank in the first embodiment; Figure 4 It is a process schematic diagram of the cup-shaped body blank formed by the round sheet in the second embodiment; Figure 5 It is a process schematic diagram of the spinning in the first embodiment; Figure 6 It is a process schematic diagram of the necking in the first embodiment; Figure 7Fig. 1 is a schematic diagram of the structure of the solution furnace in the solid solution treatment of Example 1; Figure 8 Fig. 2 is a schematic diagram of the position between the cooling water tank and the furnace body in Example 1; Figure 9 Fig. 3 is a front view of the furnace body in Example 1; Figure 10 Fig. 4 is a schematic diagram of the installation of the inner container in the stainless steel frame in Example 1; Figure 11 Fig. 5 is a schematic diagram of the cooling of the inner container in the cooling water tank in Example 1; Figure 12 Fig. 6 is a schematic diagram of the diameter ratio between the connecting pipe and the bottle mouth of the inner container in Example 1.

[0016] 10, wafer; 11, first cup-shaped body blank; 12, second cup-shaped body blank; 13, third cup-shaped body blank; 14, inner container; 141, inner cavity; 20, first upper die; 21, first forming hole; 30, first lower die; 31, first displacement hole; 40, first punch; 50, second upper die; 51, second forming hole; 60, second lower die; 61, second displacement hole; 70, second punch; 80, third upper die; 81, first die body; 811, third forming hole; 82, second die body; 821, fourth forming hole; 822, heating pipe; 83, third lower die; 831, third displacement hole; 84, connecting column; 90, third punch; 91, first top cylinder; 92, second top cylinder; 100, rotating shaft; 110, first spinning wheel; 120, rotating disc jaw; 121, second spinning wheel; 130, solid solution furnace; 131, furnace body; 132, cooling water tank; 133, moving trolley; 134, stainless steel frame; 1341, frame body; 1342, clamp; 1343, connecting pipe; 1344, limiting plate; 135, furnace door. DETAILED DESCRIPTION

[0017] The application will be further described below in conjunction with the drawings.

[0018] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustration only and do not indicate the only orientation of the application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Example One

[0020] A forming production method of a large-capacity hydrogen cylinder liner 14, comprising the following steps: Step 1-1, refer to Figure 1 As shown, the round sheet of aluminum alloy material is placed between the first upper die 20 and the first lower die 30 in the stretching machine as the stretching base material to perform the first stretching. Before the first stretching, a layer of stretching oil is uniformly brushed on both surfaces of the round sheet 10. After the first upper die 20 moves towards the first lower die 30, the two are in contact and then move downward synchronously. The first punch 40 is installed at the bottom of the stretching machine and connected to the driving member at the bottom. The first punch 40 is driven by the driving member to move towards the first lower die 30 and extrude the round sheet 10. The first upper die 20 has a first forming hole 21 in the middle. The first lower die 30 has a first displacement hole 31 in the middle. The first punch 40 extrudes the round sheet 10 through the first displacement hole 31 and gradually passes through the first forming hole 21. The round sheet 10 is extruded into a first cup-shaped body blank 11 by the outer peripheral wall of the first forming hole 21.

[0021] Step 1-2, the first cup-shaped body blank 11 is subjected to tempering treatment.

[0022] Step 1-3, the first cup-shaped body blank 11 is subjected to the second stretching. The first cup-shaped body blank 11 is placed on the second punch 70 of another stretching machine. The second upper die 50 moves towards the second lower die 60. The second punch 70 is arranged at the bottom of the stretching machine and is also driven by the driving member to rise and fall. The second upper die 50 has a second forming hole 51. The second lower die 60 has a second displacement hole 61. The diameter of the second forming hole 51 is smaller than that of the first forming hole 21.

[0023] During the second stretching, the second upper die 50 moves towards the second lower die 60. The second punch 70 moves towards the second upper die 50. After the first cup-shaped body blank 11 passes through the second forming hole 51, a second cup-shaped body blank 12 is formed.

[0024] In combination Figure 3 , the second cup-shaped body blank 12 has a greater height and a thinner wall thickness than the first cup-shaped body blank 11.

[0025] Step 2, refer to Figure 5The second cup-shaped body blank 12 is installed on the rotating shaft 100 of the spinning machine, and the tail top presses one end of the second cup-shaped body blank 12 and can rotate synchronously with the rotating shaft 100. During spinning, the first spinning wheel 110 abuts against the outer wall of the second cup-shaped body blank 12 and gradually moves away from the tail top side along the axial direction of the rotating shaft 100. The first spinning wheel 110 is provided with three circumferential distribution sets along the rotating shaft 100. After spinning, the second cup-shaped body blank 12 has a reduced wall thickness and an increased height to obtain the third cup-shaped body blank 13.

[0026] Step 3: The third cup-shaped body blank 13 is cut at the opening side on the machine tool to make the height meet the design requirements and the end face is flattened.

[0027] Step 4: The third cup-shaped body blank 13 is cleaned to remove dirt and impurities on the surface.

[0028] Step 5, refer to Figure 6 The third cup-shaped body blank 13 is clamped to the rotating jaw of the machine tool spindle with the opening side facing outward. The high-temperature spray gun is turned on to heat the opening part. The machine tool spindle rotates to drive the third cup-shaped body blank 13 to rotate. The second spinning wheel 121 gradually extrudes the outer wall of the opening side to realize closing and form the overall shape of the inner container 14.

[0029] Step 6: The inner container 14 is cut at the closing position by the machine tool to make the end face of the opening side flat.

[0030] Step 7, combined Figure 7 to Figure 11 The formed inner container 14 is subjected to heat treatment, which is solid solution treatment. A plurality of inner containers 14 are first installed on a stainless steel frame 134. The stainless steel frame 134 includes a frame body 1341, and the frame body 1341 has a plurality of limiting stations. Each limiting station can install and limit one inner container 14. The limiting station has a plurality of clamps 1342 arranged in the vertical direction and a U-shaped communication pipe 1343 fixed to the frame body 1341.

[0031] When fixing the inner container 14, the inner container 14 is inserted into the communication pipe 1343 from the opening position, so that one end of the communication pipe 1343 is placed in the inner cavity 141 of the inner container 14. Then, the inner container 14 is moved and the bottom is abutted against the limiting plate 1344 on the frame body 1341 to limit the travel of one side of the inner container 14. Finally, the clamp 1342 holds the inner container 14 so that the entire inner container 14 is connected to the frame body 1341.

[0032] The solid solution treatment adopts a solid solution furnace 130. In the embodiment, the solid solution furnace 130 includes a furnace body 131, the furnace body 131 is of a lower opening type, two furnace doors 135 are arranged on the two sides of the opening of the furnace body 131, the two furnace doors 135 are driven by driving members to move on tracks to move towards each other or away from each other, when the two furnace doors 135 move towards each other and abut against each other, the opening of the furnace body 131 can be closed to realize furnace closing.

[0033] A cooling water tank 132 is arranged below the opening of the furnace body 131, a moving trolley 133 is arranged on one side of the cooling water tank 132, during the solid solution treatment, the stainless steel frame 134 is first hoisted by a truss to the moving trolley 133, the moving trolley 133 is slid to below the opening of the furnace body 131, the two furnace doors 135 are opened, the entire stainless steel frame 134 is hoisted into the furnace body 131 by the electric hoist of the solid solution furnace 130, and the furnace doors 135 are closed for heating treatment.

[0034] During the heating treatment, the heating temperature is between 525±10 ℃, after the temperature reaches 525 ℃, the temperature is maintained, the holding time is 120±15 min. After the holding is completed, the furnace doors 135 are opened, the entire stainless steel frame 134 is hoisted into the cooling water tank 132, when the inner container 14 enters the water, the opening side faces the cooling water tank 132, the inner and outer walls of the inner container 14 can be synchronously contacted with the cooling water under the action of the communication pipe 1343 to perform cooling, the transfer time from the furnace to the cooling water is not more than 10 s, the cooling water temperature is between 15-45 ℃, and the cooling soaking time is not less than 10 min. At the solid solution temperature, the second phase (such as Mg2Si, CuAl2) of the aluminum alloy is completely dissolved into the aluminum matrix to form a uniform supersaturated solid solution, if the cooling speed is too slow, the solute atoms (Mg, Cu, etc.) in the supersaturated solid solution will be precipitated in advance during the cooling process to form coarse second phase particles, these coarse particles precipitated in advance will cause that uniform fine strengthening phases cannot be formed during subsequent aging treatment, which directly reduces the final strength and hardness of the material, and loses the significance of the solid solution treatment. Therefore, in the embodiment, the lower opening structure of the furnace body 131 can reduce the process time of the inner container 14 transferred to the cooling water tank 132, and the inner container 14 can enter the cooling water as soon as possible to achieve the effect of the solid solution treatment.

[0035] In combination Figure 12 , the height H1: H2 at which the communication pipe 1343 is inserted into the inner cavity 141 is greater than 1 / 2, the aperture ratio of the pipe diameter φ2 of the communication pipe 1343 to the aperture φ1 of the bottle opening of the inner container 14 is between 1:5 and 1:8, and the other end of the communication pipe 1343 is always arranged on the liquid surface of the cooling water tank 132.

[0036] According to the size of the bottle opening, it is ensured that the water inlet and the exhaust do not interfere with each other, and the following is a reference table of the pipe diameter of the communication pipe selected according to the aperture of the bottle opening: If the aperture ratio is less than 1:5, the water inlet is affected, and if the aperture ratio is greater than 1:8, the exhaust speed is insufficient, the high-temperature gas in the inner cavity 141 cannot be discharged in time, and the cooling effect may be affected due to the residual local air blockage.

[0037] After the solid solution treatment is completed, the stainless steel frame is lifted from the cooling water tank 132, gently placed on a small trolley, and pushed into the aging furnace. The furnace temperature is 180±10℃, and the aging holding time is ≥480±60min. After aging, the inner liner 14 is naturally cooled in the air.

[0038] Step 8: The inner liner 14 is finally cleaned by spraying. After cleaning, the entire inner liner 14 is manufactured and produced. Example Two

[0039] A large-capacity hydrogen cylinder liner forming production method, which is different from example one in that the round sheet 10 is directly formed into a second cup-shaped body blank 12 by one stretching. For details, see Figure 4 The round sheet 10 is placed between the third upper die 80 and the third lower die 83. The third upper die 80 includes a first die body 81, a second die body 82, and a connecting column 84 connecting the first die body 81 and the second die body 82. The first die body 81 has a third forming hole 811, and the second die body 82 has a fourth forming hole 821. The aperture of the third forming hole 811 is smaller than that of the fourth forming hole 821, and the first die body 81 is placed above the second die body 82. The third lower die 83 has a third displacement hole 831.

[0040] During stretching, the third upper die 80 moves towards the third lower die 83 and then moves down synchronously. The third punch 90 is placed at the bottom of the stretching machine. The third punch 90 includes a first top cylinder 91 and a second top cylinder 92. The second top cylinder 92 can extend and retract relative to the first top cylinder 91, and the second top cylinder 92 can independently extend and retract. When the third upper die 80 moves down synchronously with the third lower die 83, the second top cylinder 92 extends through the third displacement hole 831 and extrudes the round sheet 10 to gradually pass through the third forming hole 811 to form the first cup-shaped body blank 11. The third upper die 80 continues to move down, and at this time, the second top cylinder 92 extends relative to the first top cylinder 91 to extrude the first cup-shaped body blank 11 to gradually pass through the second forming hole 51 to form the second cup-shaped body blank 12.

[0041] During the process of the round sheet 10 gradually passing through the third forming hole 811, a heating pipe 822 is arranged in the second die body 82. The heating pipe 822 is a heating coil pipe. The heating pipe 822 works to heat the second die body 82 and then heat the first cup-shaped body blank 11, which facilitates the formation of the second cup-shaped body blank 12.

[0042] Compared with the multi-stage stretching forming process, this embodiment uses one-stage stretching process, which improves the forming efficiency.

[0043] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A method for molding and manufacturing a large-capacity hydrogen cylinder liner, characterized in that, Includes the following steps: Step 1: The circular piece (10) is stretched and formed into a second cup-shaped blank (12). Step 2: The second cup-shaped blank (12) is spun and formed into a third cup-shaped blank (13) so that its length and thickness meet the design requirements; Step 3: Make a cut on the open side of the third cup-shaped blank (13) to make its end face flat; Step 4: Clean the third cup-shaped blank (13); Step 5: The opening side of the third cup-shaped blank (13) is closed to form the overall shape of the inner liner (14); Step 6: Cut the end of the inner liner (14) at the closing point to make its end face flat; Step 7: Heat treatment of the inner liner (14); Step 8: Clean the inner liner (14).

2. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 1, characterized in that, Step 1 includes: Step 1-1: The circular piece (10) is stretched and formed into the first cup-shaped blank (11). Steps 1-2: The first cup-shaped blank (11) is tempered; Steps 1-3: The first cup-shaped blank (11) is stretched a second time to increase the overall height and reduce the thickness to form the second cup-shaped blank (12).

3. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 2, characterized in that, In step 1-1, the disc (10) is positioned between the first upper mold (20) and the first lower mold (30). The first upper mold (20) has a first forming hole (21), and the first lower mold (30) has a first clearance hole (31). The first punch (40) is set in the first clearance hole (31) of the first lower mold (30). The first upper mold (20) moves downward and pushes the first lower mold (30) downward. At the same time, the first punch (40) moves upward and squeezes the disc (10) so that the disc (10) gradually passes through the first forming hole (21) to form the first cup-shaped blank (11). In steps 1-3, the opening side of the first cup-shaped blank (11) is placed on the second punch (70). The second upper die (50) has a second forming hole (51), and the second lower die (60) has a second clearance hole (61). The second punch (70) is placed in the second clearance hole (61). The second upper die (50) moves downward and the second punch (70) moves upward, while simultaneously squeezing the first cup-shaped blank (11) and causing the first cup-shaped blank (11) to gradually pass through the second forming hole (51) to form the second cup-shaped blank (12). The diameter of the second forming hole (51) is smaller than the diameter of the first forming hole (21).

4. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 1, characterized in that, In step 1, the disc (10) is positioned between the third upper die (80) and the third lower die (83). The third upper die (80) has a third forming hole (811) and a fourth forming hole (821) in the vertical direction. The third lower die (83) has a third clearance hole (831). The third punch (90) is set in the clearance hole of the third lower die (83). The third upper die (80) moves downward and drives the third lower die (83) downward. At the same time, the third punch (90) moves upward and squeezes the disc (10) so that the disc (10) passes through The first cup-shaped blank (11) is formed after the third forming hole (811), and the second cup-shaped blank (12) is formed after passing through the fourth forming hole (821). The diameter of the fourth forming hole (821) is smaller than that of the third forming hole (811). The third upper mold (80) is provided with a heating tube (822) at the outer edge of the third forming hole (811). When the disc (10) passes through the third forming hole (811), the heating tube (822) heats the first cup-shaped blank (11) formed.

5. The molding and production method of the inner liner of a large-capacity hydrogen cylinder according to claim 1 or 4, characterized in that, Before stretching in step 1, stretching oil is applied to both sides of the disc (10).

6. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 1, characterized in that, In step 7, the heat treatment is solution heat treatment. The material of the disc (10) is aluminum alloy. The heating temperature in the solution furnace (130) is between 525±10℃. After the temperature reaches 525℃, it is kept warm for 120±15min. After the heat preservation is completed, the inner liner (14) is transferred to the cooling water after it comes out of the solution furnace (130). The transfer time from the furnace to the cooling water is no more than 10s. The cooling water temperature is between 15-45℃. The cooling soaking time is no less than 10min.

7. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 6, characterized in that, The solution furnace (130) has a bottom-opening structure. When the inner liner (14) is cooled after being taken out of the furnace, the cooling water tank (132) is placed below the opening of the solution furnace (130). After the inner liner (14) comes out of the solution furnace (130), it is directly hoisted into the cooling water tank (132).

8. The molding and production method of the inner liner of a large-capacity hydrogen cylinder according to claim 6, characterized in that, Multiple inner liner (14) are installed smoothly into the stainless steel frame (134). The stainless steel frame (134) is hoisted into the solution furnace (130) as a whole. During cooling, the stainless steel frame (134) is completely immersed in the cooling water tank (132). When the inner liner (14) is immersed in the cooling water tank (132), the bottle mouth is facing down so that the cooling water can quickly enter the inner cavity (141) of the inner liner (14).

9. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 8, characterized in that, The stainless steel frame (134) includes multiple limiting stations, each of which includes a U-shaped connecting pipe (1343). When the inner liner (14) is installed at the limiting station, the pressure plate abuts against one end face of the inner liner (14) opposite to the bottle opening. One end of the connecting pipe (1343) extends from the opening of the inner liner (14) into the inner cavity (141). After the stainless steel frame (134) is submerged in the cooling water tank (132), the other end of the connecting pipe (1343) is always above the liquid surface of the cooling water tank (132).

10. The molding and production method of the large-capacity hydrogen cylinder liner according to claim 9, characterized in that, The end of the connecting tube (1343) inserted into the inner liner (14) is no less than 1 / 2 of the height of the entire inner liner (14), and the ratio of the diameter of the connecting tube (1343) inserted into the inner liner (14) to the diameter of the bottle mouth of the inner liner (14) is between 1:5 and 1:8.

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