Manufacturing mold of IV-type hydrogen storage tank

Abstract

The utility model provides a manufacturing mould of an IV type hydrogen gas storage tank, which comprises a mould and a transmission mechanism arranged below the mould, the mould comprises a left mould base and a right mould base which are symmetrically arranged, the left mould base and the right mould base respectively comprise an inner container concave mould with a smooth curved surface in the middle and bottle mouth concave moulds arranged at the two ends of the inner container concave mould, excess material female dies communicating with the outer side of the die are arranged at the two ends of the left die base and the two ends of the right die base correspondingly, a vertical stop groove and a transverse stop groove are formed in the outer side of the vertical limiting part, and a transverse stop groove is formed in the edge of the cambered surface limiting part. According to the utility model, the metal lining piece is fixed at a specified position through the fixed mounting rod, in the blow molding process, the metal lining piece is fixed at the bottle opening of the liner, and the bottle opening of the liner in a molten state is embedded into the vertical stop groove and the transverse stop groove through extrusion during mold closing, so that the metal lining piece is stably mounted, and meanwhile, the metal lining piece is fixed at a specified position. The sealing performance of the metal lining piece and the bottle opening of the inner container can be ensured; and compared with rotational molding and injection molding modes, the reliability is higher.

Description

Technical Field

[0001] The utility model relates to a manufacturing die for an IV type hydrogen gas storage tank, belonging to the technical field of gas storage device processing. Background Art

[0002] Hydrogen storage technology is key to the development of new energy vehicles. The development and application of traditional metal-lined Type III gas cylinders is becoming increasingly mature in my country. However, these cylinders suffer from significant drawbacks such as hydrogen embrittlement and poor fatigue performance, posing significant obstacles to their use as on-board hydrogen storage cylinders. The recent development of plastic-lined Type IV gas cylinders offers a viable approach for improving the hydrogen density, fatigue resistance, and hydrogen barrier properties of on-board gas cylinders. To improve overall rigidity, Type IV gas cylinders typically utilize metal neck technology at both ends of the plastic liner to facilitate liner fixation during the subsequent winding process. Due to the significant material differences between the metal neck and the plastic liner, the quality of the interface connection between the two becomes crucial for determining the cylinder's airtightness. Furthermore, during the cylinder's filling and deflation process, the plastic neck undergoes slight deformation, creating a gap between it and the metal neck, which can easily lead to hydrogen leakage and other problems, posing a significant safety hazard.

[0003] Existing Chinese patent CN 118254319 A is a rotational molding process for IV-type bottles containing valve seats. The application discloses a technical solution including "step S1: installing the valve seat in the rotational molding mold head of the rotational molding equipment; step S2: adding raw materials to the rotational molding mold of the rotational molding equipment, keeping the mold horizontal and turning on the vacuum equipment to evacuate; step S3: turning on the mold heating and mold rotation; step S4: after the heating is completed, cooling the mold and introducing protective gas, and performing demoulding; the mold heating is divided into three heating stages, including: the first heating stage: the mold temperature is 100°C to 140°C, the valve seat additional compensation temperature is 100°C to 140°C, and the heating time is 15 to 30 minutes; the second heating stage Heating: Mold temperature is 160°C to 200°C, valve seat additional compensation temperature is 40°C to 80°C, and heating time is 10 to 30 minutes; third stage heating: Mold temperature is 230°C to 260°C, and heating time is 5 to 15 minutes. "According to the process disclosed in the application, the heating phase alone takes a minimum of 30 minutes and a maximum of 75 minutes to produce a Type IV hydrogen storage tank by rotational molding. Although the rotational molding cradle can simultaneously install multiple rotational molding molds for rotational processing, this heating time alone and the demolding and cooling time still require a considerable amount of production time. The rotational molding process is time-consuming and not conducive to rapid mass production of products.

[0004] There is also CN 114889038 A, a device and method for injection molding the liner of a Type IV gas cylinder. The application discloses a technical solution: "The metal head 8 includes a head section and an elliptical shoulder, the head section is provided with a thread 81, the upper side of the elliptical shoulder has a barb-shaped groove 82, and the lower side of the shoulder has a trapezoidal stepped groove 83. The elliptical shoulder is anodized or acid-treated and ultrasonically cleaned with water before injection molding to form a nano-scale microporous structure. During the injection molding process, the molten polymer enters the nano-scale micropores to produce an "anchor connection", which increases the bonding area and improves the bonding strength between the metal shoulder and the plastic." This application uses an injection molding method, and the mold structure design is complex. In the structural design of the metal shoulder, since the plastic is wrapped around the metal shoulder, The surface is sealed by increasing the contact area between the plastic and the metal. "The elliptical shoulder is anodized or acid-treated and ultrasonically cleaned with water before injection molding to form a nano-scale microporous structure." The metal shoulder needs to be pre-processed, and the consistency of this pre-processing cannot be guaranteed, that is, the tightness of the contact between the plastic and the metal shoulder cannot be actually guaranteed. In addition, the exhaust channel 12 of this application is arranged in the bottle body structure part, which is far away from the metal shoulder. The gas in the nano-scale micropores is very likely to remain in the gap during the injection molding process. When the molten plastic is filled into the metal shoulder, the probability of causing a cavity is also relatively increased, which is further reflected in the fact that the fit between the plastic and the metal shoulder will be affected.

[0005] Therefore, in view of the shortcomings of the existing technology, there is an urgent need for a mold for manufacturing a type IV hydrogen storage tank with fast production speed and better connection stability and reliability between the metal lining and the plastic liner. Summary of the Invention

[0006] Purpose of the invention: In view of the deficiencies in the prior art, the utility model provides a mold for manufacturing a type IV hydrogen storage tank, in which a metal lining is fixed at a specified position by a fixed mounting rod. During the blow molding process, the metal lining is fixed at the mouth of the inner liner bottle, and the mouth of the inner liner bottle in a molten state is embedded in the vertical stop groove and the horizontal stop groove through extrusion when the mold is closed. While achieving stable installation of the metal lining, the sealing between the metal lining and the mouth of the inner liner bottle can be ensured, so as to solve the problems mentioned in the above-mentioned background technology.

[0007] Technical solution: A mold for manufacturing a Type IV hydrogen storage tank, comprising a mold and a transmission mechanism mounted below the mold, characterized in that: the mold comprises a symmetrically arranged left mold base and a right mold base, the left mold base and the right mold base being simultaneously moved inward or outward by a transmission mechanism disposed below the mold, and further comprising a fixed mounting rod having a lower end fixedly connected to the transmission mechanism, the fixed mounting rod having metal liners at both ends, the fixed mounting rod being configured as a hollow structure with a side opening connected to an air blowing pipeline;

[0008] The left mold base and the right mold base each include an inner liner die with a smooth curved surface in the middle and bottle mouth dies provided at both ends of the inner liner die. Both ends of the left mold base and the right mold base are provided with residual material dies communicating with the outside of the mold. The inner wall of the inner liner die is provided with fine air holes communicating with the outside of the mold.

[0009] The metal lining part includes a vertical limiting part set in the gap with the bottle mouth die and an arc surface limiting part set in the gap with the inner liner die. A vertical stop groove and a horizontal stop groove are set on the outside of the vertical limiting part, and a horizontal stop groove is set on the edge of the arc surface limiting part.

[0010] The utility model fixes the metal lining part in a specified position by fixing the mounting rod, fixes the metal lining part at the mouth of the inner liner bottle during the blow molding process, and embeds the inner liner bottle mouth in a molten state into the vertical stop groove and the horizontal stop groove through the extrusion when the mold is closed, thereby achieving stable installation of the metal lining part and ensuring the sealing between the metal lining part and the mouth of the inner liner bottle; compared with rotational molding and injection molding, the utility model has higher reliability; during the blow molding process, air is discharged through fine pores without affecting the surface state of the molded inner liner, thereby improving the smoothness of demoulding; the residual material dies arranged at both ends of the left mold base and the right mold base can retain excess plastic in the residual material dies when the mold is closed, and the flow of plastic can be restricted by the extrusion when the mold is closed, thereby preventing residual material from adhering to the upper side of the mold, making it more convenient to clean the residual material.

[0011] A truncated boss is provided at the connection between the upper end of the bottle mouth die and the residual material die. After the mold is closed, the truncated bosses on the left and right die bases abut against the fixed mounting rods, and the truncated bosses on both sides are combined to form a closed circular truncation surface.

[0012] By setting a truncation boss, during the mold closing process, the molten plastic is gradually gathered towards the fixed mounting rod, so that the plastic can gradually adhere to the surface of the metal lining part. When the mold is closed, the truncation boss abuts against the fixed mounting rod to cut off the molten plastic. At this time, the liner die and the bottle mouth die exert inward extrusion on the molten plastic to fill the material completely. At the same time, the gap between the metal liner and the liner die and the bottle mouth die constitutes a partial shoulder and a complete bottle mouth structure of the gas tank. The bottle body and the remaining shoulder structure are expanded and fit with the liner die through the blow molding process, and solidify after cooling to form a complete liner structure.

[0013] The fixed mounting rod includes a connecting rod and connecting sleeves provided with external threads at both ends of the connecting rod, the metal lining is threadedly connected to the connecting sleeve, and after the mold is closed, the truncated boss abuts against the outer side of the connecting sleeve;

[0014] The connecting rod includes an upper connecting rod and a lower connecting rod. The end of either the upper connecting rod or the lower connecting rod away from the connecting sleeve is provided with a plug-in groove, and the other end close to the plug-in groove is provided with a plug-in key matching the plug-in groove. The upper end of the connecting sleeve at the end of the upper connecting rod is provided with a process groove for cooperating with a rotating tool.

[0015] For double-bottle-mouth gas storage tanks, in order to facilitate the disassembly work after demolding, the fixed mounting frame is set as an upper and lower split structure, and the contact embedding connection method is adopted to realize quick installation and disassembly. The connecting sleeve is used at the end to install the metal lining part, which is convenient for fixing the metal lining part, and can reduce the diameter of the upper connecting rod and the lower connecting rod, further improving the convenience of installation and disassembly. Even if the upper connecting rod has a certain degree of wear due to long-term use, it will be slightly offset. During the mold closing process, the inward extrusion applied to the fixed connecting rod by cutting off the boss before the mold is fully closed can realize the automatic correction function; by setting the process groove, after the subsequent demolding is completed, it can be more convenient to use tools to unscrew it when the fixed mounting rod is taken out.

[0016] The left and right mold bases are provided with sunken flash material cutting areas at both ends located on the left and right sides of the bottle mouth die, the residual material die and the shoulder part of the inner liner die. The edges of the bottle mouth die, the residual material die and the shoulder part of the inner liner die are in the same plane as the edge of the bottle body part of the inner liner die.

[0017] In order to avoid excess material from not entering the residual material cavity during the mold closing process, a sunken flash material cutting area is set. When the molten plastic is cut off during mold closing, more residual material can enter the flash material cutting area, avoiding the situation where the mold cannot be completely closed during pressing. The edge parts of other structures are kept in the same plane to ensure that no material is squeezed out of the mold during mold closing, making the product surface smoother and improving product quality.

[0018] A positioning wedge groove is provided at the edge of the flash material cutting area, a positioning wedge block is fixedly arranged in any positioning wedge groove, the shape of the other positioning wedge groove matches the shape of the positioning wedge block, and the positioning wedge block is embedded in the other positioning wedge groove after the mold is closed.

[0019] In order to avoid the possible upward and downward displacement of the mold after mold closing, the positioning wedge block and the positioning wedge groove are coordinated to achieve self-guiding during the mold closing process and auxiliary positioning after the mold closing is completed, thereby ensuring the mold closing stability of the left mold base and the right mold base.

[0020] Cooling water pipes are provided inside the left mold base and the right mold base. Any of the cooling water pipes passes through the mold in which they are located and is connected to the external water channel. The cooling water pipes are provided in at least two layers along the thickness direction of the mold in which they are located, and the number of cooling water pipes increases from the outside to the inside.

[0021] Exhaust pipes are also provided inside the left mold base and the right mold base. Any of the exhaust pipes is connected to fine air holes and is connected to the outside of the mold through the exhaust pipe. The aperture size of the fine air holes is 02.mm~0.4mm.

[0022] In order to reduce the mold temperature and enable rapid heat exchange to solidify the molten plastic, a series of cooling water channels are arranged inside the mold in a crisscross pattern. The water channels close to the inner liner cavity are more densely distributed to improve the heat exchange efficiency. The remaining channels are used as auxiliary cooling for the mold. The number is relatively small, which saves mold opening costs while ensuring that the cooling effect meets the cooling and solidification requirements. The aperture size of the fine pores is limited to a certain range, which can not only achieve exhaust but also prevent plastic from entering the fine pores under the action of air pressure, causing blockage or uneven product surface.

[0023] The transmission mechanism includes a gear base that is transmission-connected to the drive device and is fixed in position. The middle portion of the gear base is fixedly connected to the connecting sleeve of the lower connecting rod, and driving gears are respectively provided near the middle position of both ends. The driving gears are transmission-connected to the output end of the drive device;

[0024] The invention also includes two rack transmission assemblies corresponding to the driving gears at both ends, each of the rack transmission assemblies including a first spur rack and a second spur rack arranged on opposite sides of the driving gear and meshing with the driving gear, one end of the first spur rack being fixedly connected to the left mold base via a first fixing rod, and the opposite end of the second spur rack being fixedly connected to the right mold base via a second fixing rod;

[0025] Guide holes are provided at both ends of the gear base, guide shafts are installed in the guide holes, and the guide shafts are located on both sides of the gear base and are respectively provided with guide rods fixedly connected to the left mold base and the right mold base.

[0026] The double gear transmission at the bottom ensures that the mold remains synchronized during the movement process. The setting of the guide structure ensures the consistency of direction during the movement of the mold, making the mold closing action more precise and further improving the production quality of the product.

[0027] Beneficial effects: The utility model fixes the metal lining at a specified position by a fixed mounting rod, fixes the metal lining at the mouth of the liner bottle during the blow molding process, and the molten mouth of the liner bottle is embedded in the vertical stop groove and the horizontal stop groove through the extrusion when the mold is closed, thereby achieving stable installation of the metal lining while ensuring the sealing between the metal lining and the mouth of the liner bottle; compared with rotational molding and injection molding, the reliability is higher; by setting a cut-off boss, during the closing process, the molten plastic is gradually gathered toward the fixed mounting rod, so that the plastic can gradually adhere to the surface of the metal lining, and when the mold is closed, the cut-off boss is abutted against the fixed mounting rod to cut off the molten plastic, and at this time the liner cavity mold and the bottle mouth cavity mold exert inward extrusion on the molten plastic to fill the material completely; when the blow molding is completed, the sealing of the bottle mouth part is also completed, and the IV type hydrogen storage tank liner structure with reliable sealing stability can be quickly produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of the mold of this utility model.

[0030] Figure 2 This is a schematic diagram of the right mold base structure of the utility model.

[0031] Figure 3 This is a partial schematic diagram of the installation structure of the right mold base and the metal lining component of the utility model.

[0032] Figure 4 It is a partial schematic diagram of the right mold base of the utility model.

[0033] Figure 5 This is a schematic diagram of the structure of the metal lining component of the utility model being installed on the connecting sleeve.

[0034] Figure 6 This is a structural schematic diagram of the utility model in which the fixed mounting rod is installed on the gear base.

[0035] Figure 7 This is a cross-sectional view of the connection between the upper connecting rod and the lower connecting rod of the present invention.

[0036] Figure 8 This is a top view of the fixed mounting rod of the utility model installed on the gear base structure.

[0037] Figure 9This is a schematic diagram of the layout of the cooling water pipe and exhaust pipe of the utility model.

[0038] Figure 10 It is a partial diagram of the transmission mechanism of the present utility model.

[0039] Figure 11 It is a partial diagram of the transmission mechanism of the present utility model. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] like Figures 1 to 4 As shown, a mold for manufacturing a Type IV hydrogen storage tank includes a mold and a transmission mechanism 3 installed below the mold. The mold includes a symmetrically arranged left mold base 1 and right mold base 2. The left mold base 1 and the right mold base 2 are simultaneously moved inward or outward by the transmission mechanism 3 installed below the mold. The mold also includes a fixed mounting rod 4 fixedly connected to the transmission mechanism 3 at its lower end. The fixed mounting rod 4 has metal linings 41 at both ends. The fixed mounting rod 4 is configured as a hollow structure with a side opening connected to the air blowing pipeline.

[0044] The left mold base 1 and the right mold base 2 each include an inner liner die 5 with a smooth curved surface in the middle and bottle mouth dies 6 provided at both ends of the inner liner die 5. Both ends of the left mold base 1 and the right mold base 2 are provided with residual material dies 7 that communicate with the outside of the mold. The inner wall of the inner liner die 5 is provided with fine air holes 8 that communicate with the outside of the mold.

[0045] The metal lining member 41 includes a vertical stopper 411 provided with a gap between the bottle mouth die 6 and a curved stopper 412 provided with a gap between the inner liner die 5. A vertical stopper groove 413 and a horizontal stopper groove 414 are provided on the outer side of the vertical stopper 411, and a horizontal stopper groove 414 is provided on the edge of the curved stopper 412. Alternatively, an annular groove and a vertical groove similar to those of the vertical stopper 411 can be provided on the curved surface of the curved stopper 412 to achieve vertical and horizontal stops.

[0046] The utility model fixes the metal lining part 41 at a specified position by fixing the mounting rod 4. During the blow molding process, the metal lining part 41 is fixed to the mouth of the inner liner bottle, and the mouth of the inner liner bottle in a molten state is embedded in the vertical stop groove 413 and the horizontal stop groove 414 through the extrusion when the mold is closed. While achieving stable installation of the metal lining part 41, the sealing between the metal lining part 41 and the mouth of the inner liner bottle can be ensured; compared with rotational molding and injection molding, the reliability is higher; during the blow molding process, air is discharged through the fine air holes 8 without affecting the surface state of the molded inner liner, thereby improving the smoothness of demoulding; the residual material die 7 set at both ends of the left mold base 1 and the right mold base 2 can retain excess plastic in the residual material die 7 when the mold is closed, and the flow of plastic can be restricted by the extrusion of the mold closing, thereby preventing residual material from adhering to the upper side of the mold, making it more convenient to clean the residual material.

[0047] A truncated boss 9 is provided at the connection between the upper end of the bottle mouth die 6 and the residual material die 7. After the mold is closed, the truncated boss 9 on the left mold base 1 and the right mold base 2 abut against the fixed mounting rod 4, and the truncated bosses 9 on both sides are combined to form a closed circular cross-section surface.

[0048] By setting the truncation boss 9, during the mold closing process, the molten plastic is gradually gathered toward the fixed mounting rod 4, so that the plastic can gradually adhere to the surface of the metal lining part 41. When the mold is closed, the truncation boss 9 abuts against the fixed mounting rod 4 to cut off the molten plastic. At this time, the liner die 5 and the bottle mouth die 6 exert inward extrusion on the molten plastic to fill the material completely. At the same time, the gap between the metal lining part 41 and the liner die 5 and the bottle mouth die 6 constitutes a partial shoulder and a complete bottle mouth structure of the gas tank. The bottle body and the remaining shoulder structure are expanded and fit with the liner die 5 through the blow molding process, and solidify after cooling to form a complete liner structure.

[0049] like Figures 5 to 8As shown, the fixed mounting rod 4 includes a connecting rod and connecting sleeves 42 provided at both ends of the connecting rod and provided with external threads. The metal lining 41 is threadedly connected to the connecting sleeve 42. After the mold is closed, the truncated boss 9 abuts against the outer side of the connecting sleeve 42.

[0050] The connecting rod includes an upper connecting rod 43 and a lower connecting rod 44. Any one of the upper connecting rod 43 and the lower connecting rod 44 is provided with a plug-in groove 45 at the end away from the connecting sleeve 42, and the other end close to the plug-in groove 45 is provided with a plug-in key 46 matching the plug-in groove 45. The upper end of the connecting sleeve 42 at the end of the upper connecting rod 43 is provided with a process groove 47 for cooperating with a rotating tool.

[0051] For double-bottle-mouth gas storage tanks, in order to facilitate the disassembly work after demolding, the fixed mounting frame is set as an upper and lower split structure, and a contact embedding connection method is adopted to achieve quick installation and disassembly. The end is connected with a connecting sleeve 42 for the installation of the metal lining part 41, which is convenient for fixing the metal lining part 41, and can reduce the diameter of the upper connecting rod 43 and the lower connecting rod 44, further improving the convenience of installation and disassembly. Even if a certain amount of wear is caused by long-term use, the upper connecting rod will be slightly offset. During the mold closing process, the inward extrusion applied to the fixed connecting rod by cutting off the boss 9 before the mold is fully closed can realize the automatic correction function; by setting the process groove 47, after the subsequent demolding is completed, it can be more convenient to use tools to unscrew it when the fixed mounting rod 4 is taken out.

[0052] Both ends of the left mold base 1 and the right mold base 2 are located on the left and right sides of the bottle shoulder parts of the bottle mouth die 6, the residual material die 7 and the inner liner die 5, and sunken flash material cutting areas 10 are provided. The edges of the bottle shoulder parts of the bottle mouth die 6, the residual material die 7 and the inner liner die 5 are in the same plane as the edge of the bottle body part of the inner liner die 5.

[0053] In order to avoid excess material from not entering the residual material die 7 during the mold closing process, a sunken flash material cutting area 10 is set. When the molten plastic is cut off during mold closing, more residual material can enter the flash material cutting area 10, avoiding the situation where the mold cannot be completely closed during mold pressing. The edge parts of other structures are kept in the same plane to ensure that no material is squeezed out of the mold during mold closing, making the product surface smoother and improving product quality.

[0054] A positioning wedge groove 101 is provided at the edge of the flash material cutting area 10. A positioning wedge block 102 is fixedly installed in any positioning wedge groove 101. The shape of the other positioning wedge groove 101 matches the shape of the positioning wedge block 102. After the mold is closed, the positioning wedge block 102 is embedded in the other positioning wedge groove 101.

[0055] In order to avoid the possible upward and downward displacement of the mold after mold closing, the positioning wedge block 102 and the positioning wedge groove 101 cooperate to achieve self-guiding during the mold closing process and auxiliary positioning after the mold closing is completed, thereby ensuring the mold closing stability of the left mold base 1 and the right mold base 2.

[0056] like Figure 9 As shown, cooling water pipes 103 are provided inside the left mold base 1 and the right mold base 2. Any cooling water pipe 103 passes through the mold in which it is located and is connected to the external water channel. The cooling water pipes 103 are provided in at least two layers along the thickness direction of the mold in which they are located, and the number of cooling water pipes 103 increases from the outside to the inside.

[0057] Exhaust pipes are also provided inside the left mold base 1 and the right mold base 2. Any of the exhaust pipes 104 is connected to the fine air hole 8 and is connected to the outside of the mold through the exhaust pipe 104. The aperture of the fine air hole 8 is 0.3 mm.

[0058] In order to lower the mold temperature and enable rapid heat exchange to solidify the molten plastic into shape, cooling water channels are arranged in a crisscross pattern inside the mold, and the water channels close to the inner liner die 5 are more densely distributed to improve the heat exchange efficiency. The rest are used as auxiliary cooling for the mold, and the number is relatively small, which saves mold opening costs while ensuring that the cooling effect meets the cooling and solidification requirements; the aperture size of the fine pores 8 is limited to a certain range, which can not only achieve exhaust but also avoid the plastic entering the fine pores 8 under the action of air pressure, causing blockage or an uneven product surface.

[0059] like Figure 10 and 11 As shown, the transmission mechanism 3 includes a gear base 31 that is transmission-connected to the drive device and fixed in position. The middle portion of the gear base 31 is fixedly connected to the connecting sleeve 42 of the lower connecting rod 44, and driving gears 32 are respectively provided near the middle position at both ends. The driving gears 32 are transmission-connected to the output end of the drive device;

[0060] The invention also includes two rack transmission assemblies corresponding to the drive gears 32 at both ends. Each of the rack transmission assemblies includes a first spur rack 33 and a second spur rack 34 arranged on both sides of the drive gear 32 and meshing with the drive gear 32. One end of the first spur rack 33 is fixedly connected to the left mold base 1 via a first fixing rod 35, and the opposite end of the second spur rack 34 is fixedly connected to the right mold base 2 via a second fixing rod 36.

[0061] The gear base 31 is provided with guide holes 37 at both ends, and guide shafts 38 are installed in the guide holes 37. The guide shafts 38 are located on both sides of the gear base 31 and are respectively provided with guide rods 39 fixedly connected to the left mold base 1 and the right mold base 2.

[0062] The double gear transmission at the bottom ensures that the mold remains synchronized during the movement process. The setting of the guide structure ensures the consistency of direction during the movement of the mold, making the mold closing action more precise and further improving the production quality of the product.

[0063] The manufacturing process of the mold for the Type IV hydrogen storage tank includes the following steps:

[0064] Step 1: Unloading and mold closing

[0065] The cylindrical molten plastic liner raw material is squeezed downward by a discharge device arranged just above the fixed mounting rod 4, so that the fixed mounting rod 4 is inserted into the hollow portion of the cylindrical plastic liner raw material until the lower end of the plastic liner raw material completely covers the connecting sleeve 42 of the lower connecting rod 44. The transmission mechanism 3 is then activated to move the left mold base 1 and the right mold base 2 closer together until the left mold base 1 and the right mold base 2 come into contact, and the positioning wedge 102 is inserted into the positioning wedge groove 101.

[0066] Step 2: Blow molding

[0067] After the mold is closed, the gas flows through the fixed mounting rod 4 through the blowing pipe and is filled into the mold. The molten plastic liner raw material is filled with gas until it fits the inner wall of the liner cavity mold 5. After being cooled by the left mold base 1 and the right mold base 2, it is cooled and solidified.

[0068] Step 3: Edge grinding

[0069] After the cooling and solidification stage, the mold is opened to take out the solidified Type IV hydrogen gas storage tank, and the excess plastic produced by the side seam extrusion during the mold closing process is trimmed and polished to make the surface roughness of the Type IV hydrogen gas storage tank less than or equal to 1.6 microns.

[0070] During the mold closing process of step 1, when the left mold base 1 and the right mold base 2 are squeezed with the plastic liner raw material, inward pressure is generated, causing the plastic liner raw material to gradually adhere to the surface of the metal lining 41 as the left mold base 1 and the right mold base 2 move until the mold closing is completed. The molten plastic liner raw material is squeezed through the mold and filled into the vertical stop groove 413 and the horizontal stop groove 414.

[0071] The gas pressure of the gas introduced into the mold in step 2 is 0.8 MPa;

[0072] The temperature of the left mold base 1 and the right mold base 2 is maintained at 30°C by controlling the flow rate of the cooling water pipe 103. During the application optimization process, multiple cooling experiments can be conducted to observe the structural state of the bottle body after solidification and molding, and the lowest temperature can be tested while ensuring that the bottle body structure is not affected, so as to accelerate the solidification time, shorten the overall manufacturing time, and improve production efficiency.

[0073] After 3 minutes of mold closing, the cooling and solidification are completed, and the mold is opened to proceed to step 3.

[0074] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0075] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mold for manufacturing a type IV hydrogen storage tank, comprising a mold and a transmission mechanism (3) installed below the mold, characterized in that: The mold comprises a symmetrically arranged left mold base (1) and a right mold base (2), wherein the left mold base (1) and the right mold base (2) are simultaneously moved inward or outward by a transmission mechanism (3) arranged below the mold, and further comprises a fixed mounting rod (4) whose lower end is fixedly connected to the transmission mechanism (3), wherein both ends of the fixed mounting rod (4) are respectively provided with metal lining members (41), and the fixed mounting rod (4) is arranged as a hollow structure with a side opening, which is communicated with an air blowing pipeline; The left mold base (1) and the right mold base (2) both include an inner liner die (5) with a smooth curved surface in the middle and bottle mouth dies (6) arranged at both ends of the inner liner die (5); both ends of the left mold base (1) and the right mold base (2) are provided with residual material dies (7) communicating with the outside of the mold; the inner wall of the inner liner die (5) is provided with fine air holes (8) communicating with the outside of the mold; The metal lining member (41) comprises a vertical limiting portion (411) provided with a gap between the vertical limiting portion (411) and the bottle mouth die (6), and a curved surface limiting portion (412) provided with a gap between the vertical limiting portion (411) and the inner liner die (5). A vertical stop groove (413) and a horizontal stop groove (414) are provided on the outer side of the vertical limiting portion (411), and a horizontal stop groove (414) is provided on the edge of the curved surface limiting portion (412).

2. The mold for manufacturing a type IV hydrogen storage tank according to claim 1, characterized in that: A truncation boss (9) is provided at the connection between the upper end of the bottle mouth die (6) and the residual material die (7); after the molds are closed, the truncation boss (9) on the left mold base (1) and the right mold base (2) abut against the fixed mounting rod (4), and the truncation bosses (9) on both sides are combined to form a closed circular truncation surface.

3. The mold for manufacturing a type IV hydrogen storage tank according to claim 2, characterized in that: The fixed mounting rod (4) comprises a connecting rod and connecting sleeves (42) provided at both ends of the connecting rod and provided with external threads, the metal lining (41) is threadedly connected to the connecting sleeve (42), and after the mold is closed, the truncated boss (9) abuts against the outer side surface of the connecting sleeve (42); The connecting rod comprises an upper connecting rod (43) and a lower connecting rod (44), wherein an end of either the upper connecting rod (43) or the lower connecting rod (44) away from the connecting sleeve (42) is provided with a plug-in groove (45), and an end of the other connecting rod close to the plug-in groove (45) is provided with a plug-in key (46) matching the plug-in groove (45), and an upper end of the connecting sleeve (42) at the end of the upper connecting rod (43) is provided with a process groove (47) for matching a rotating tool.

4. The mold for manufacturing a type IV hydrogen storage tank according to claim 1, characterized in that: Both ends of the left mold base (1) and the right mold base (2) are provided with sunken flash material cutting areas (10) on the left and right sides of the bottle mouth die (6), the residual material die (7) and the bottle shoulder of the liner die (5). The edges of the bottle mouth die (6), the residual material die (7) and the bottle shoulder of the liner die (5) are in the same plane as the edge of the bottle body of the liner die (5).

5. The mold for manufacturing a type IV hydrogen storage tank according to claim 4, characterized in that: A positioning wedge groove (101) is provided at the edge of the flash material cutting area (10), a positioning wedge block (102) is fixedly provided in any positioning wedge groove (101), the shape of the other positioning wedge groove (101) matches the shape of the positioning wedge block (102), and the positioning wedge block (102) is embedded in the other positioning wedge groove (101) after the mold is closed.

6. The mold for manufacturing a Type IV hydrogen storage tank according to claim 1, characterized in that: Cooling water pipes (103) are provided inside the left mold base (1) and the right mold base (2), and any of the cooling water pipes (103) passes through the mold and is connected to an external water channel. The cooling water pipes (103) are provided in at least two layers along the thickness direction of the mold, and the number of the cooling water pipes (103) increases from the outside to the inside. An exhaust pipe is also provided inside the left mold base (1) and the right mold base (2), and any of the exhaust pipes is connected to a fine air hole (8) and is connected to the outside of the mold through the exhaust pipe. The aperture of the fine air hole (8) is 0.2 mm to 0.4 mm.

7. The mold for manufacturing a Type IV hydrogen storage tank according to claim 1, characterized in that: The transmission mechanism (3) includes a gear base (31) that is transmission-connected to the driving device and fixed in position. The middle of the gear base (31) is fixedly connected to the connecting sleeve (42) of the lower connecting rod (44). Drive gears (32) are respectively provided near the middle of both ends. The drive gears (32) are transmission-connected to the output end of the driving device. It also includes two rack transmission assemblies corresponding to the driving gears (32) at both ends, and any of the rack transmission assemblies includes a first straight rack (33) and a second straight rack (34) arranged on both sides of the driving gear (32) and meshing with the driving gear (32), one end of the first straight rack (33) is fixedly connected to the left mold base (1) through a first fixing rod (35), and the opposite end of the second straight rack (34) is fixedly connected to the right mold base (2) through a second fixing rod (36); Guide holes (37) are provided at both ends of the gear base (31), guide shafts (38) are installed in the guide holes (37), and the guide shafts (38) are located on both sides of the gear base (31) and are respectively provided with guide rods (39) fixedly connected to the left mold base (1) and the right mold base (2).

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