A rotational molding device for a dome thickness variable hydrogen storage bottle plastic liner

Abstract

The application discloses a rotational moulding forming device for a plastic inner container of a hydrogen storage bottle with variable dome thickness, which comprises a supporting assembly, two supporting cylinders oppositely arranged in the axial direction and spaced apart, and rotating members rotatably connected to the two supporting cylinders; a forming assembly, two outer molds capable of simultaneously moving towards each other or moving away from each other, a mold outer cylinder inserted between the two outer molds, and a material mold connected in the outer molds, wherein the material mold comprises coaxially arranged inner and outer mold cores, rotating portions fixed to the left and right ends of the outer mold core, the rotating portions being connected to the outer mold, and a plurality of material throwing units arranged on the outer edges of the left and right ends of the inner mold core, wherein the material throwing unit comprises a material throwing pipe fixed to the outer edge of the inner mold core, one end of the material throwing pipe away from the inner mold core is fixed to the outer mold core, a closed forming cavity is formed among the outer edge of the outer mold core, the inner edges of the two outer molds and the inner edge of the mold outer cylinder, and the inner cavity of the material throwing pipe is in communication with the forming cavity; and the plastic inner container with different dome thicknesses can be processed by using the application.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage bottle plastic liner manufacturing technology, and in particular to a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness. Background Technology

[0002] With human development and the advancement of science and technology, the world continues to move towards energy conservation and emission reduction. Currently, Type IV hydrogen storage cylinders in China are still in the early stages of research and development. For Type IV hydrogen storage cylinders, the sealing performance of the cylinder mouth, the strength and lifespan of the overall structure, and the overall safety and reliability are all focal points of attention for many scholars. Among these, the molding process of the plastic liner is particularly important for the strength, lifespan, and safety and reliability of the overall structure. The thickness of the dome structure in the plastic liner is a significant factor affecting the strength and lifespan of the cylinder. When using existing molding equipment to process the plastic liner of hydrogen storage cylinders, only a single dome thickness can be produced, making it impossible to adjust the dome thickness of the plastic liner according to actual needs. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems existing in the preparation of plastic liners for hydrogen storage bottles in the above and / or prior art, the present invention is proposed.

[0005] The technical problem solved by this invention is the inability to adjust the dome thickness of the plastic inner liner according to actual needs.

[0006] Therefore, the purpose of this invention is to provide a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness. Through the structural arrangement of an axially movable mold and an outer mold, it can process plastic liners with different dome thicknesses, thus having a wider range of applications.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a rotational molding apparatus for a hydrogen storage cylinder plastic liner with variable dome thickness, comprising, The support assembly includes two support cylinders that are axially opposite to each other and spaced apart, and each support cylinder is rotatably connected to a rotating component. A molding assembly includes two outer molds that can face each other or move away from each other simultaneously. A mold outer cylinder is inserted between the two outer molds. The two outer molds are set between two support cylinders. A material mold is connected inside the outer mold. The material mold includes an inner mold core and an outer mold core arranged coaxially. Rotating parts are fixed at the left and right ends of the outer mold core. The rotating parts are connected to the outer molds. Several material ejection units are arranged on the outer edges of the left and right ends of the inner mold core. Each material ejection unit includes a material ejection tube fixed to the outer edge of the inner mold core. The end of the material ejection tube away from the inner mold core is fixedly connected to the outer mold core. A closed molding cavity is formed between the outer edge of the outer mold core, the inner edges of the two outer molds, and the inner edge of the mold outer cylinder. The inner cavity of the material ejection tube can communicate with the molding cavity.

[0008] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, wherein: the inner rings of the two outer molds are respectively threadedly connected to the outer rings of the two rotating parts, the rotating parts are provided with a first clutch, the inner ring of the support cylinder has a plurality of first snap-fit ​​grooves corresponding one-to-one with a plurality of pressure blocks of the first clutch, the pressure blocks of the first clutch can be snapped into the first snap-fit ​​grooves, and the two outer molds can move synchronously toward or away from each other.

[0009] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, wherein: a plurality of locking blocks are arranged on the side of the rotating component corresponding to the outer mold, and a plurality of second locking grooves corresponding one-to-one with the locking blocks are arranged on the outer edge of the side of the outer mold corresponding to the rotating component, the locking blocks are locked in the corresponding second locking grooves, the rotating component is also provided with a second clutch, and a plurality of third locking grooves corresponding one-to-one with the plurality of pressure blocks on the second clutch are arranged on the rotating part.

[0010] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, it further includes: a pressure assembly disposed at the inner mold core, the pressure assembly including a pressure shell fixed to the inner side of the inner mold core, the pressure shell including a central connecting shell body, a plurality of outer connecting shell bodies arranged in the circumferential direction of the central connecting shell body, a plurality of partitions corresponding one-to-one with the outer connecting shell bodies fixed in the central connecting shell body, a first spring connected to one side of the partition opposite to the outer ring of the outer connecting shell body, a metal block slidably connected to the end of the first spring away from the partition body, the two ends of the pressure shell in the axial direction respectively being movably connected to pressure plates that are just slidably connected along the inner side of the inner mold core, a material cavity between the side of the two pressure plates away from each other and the inner edge of the inner mold core, the inner cavity of the material discharge pipe communicating with the material cavity, the two ends of the inner mold core in the axial direction respectively being fixed with mixing pipes for convenient introduction of gas and materials, when the metal block moves away from the partition, the pressure plate moves in the direction of the corresponding mixing pipe.

[0011] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, wherein: the left and right ends of the outer connecting shell body away from the central connecting shell body are respectively fixed with support sleeves, and support rods are slidably connected to the support sleeves, and the end of the support rod away from the outer connecting shell body is fixedly connected to the pressure plate.

[0012] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, wherein: air inlet pipes are respectively fixed at both ends of the outer connecting shell body, one end of the air inlet pipe close to the outer connecting shell body is connected to an air inlet one-way valve, a sliding sleeve is slidably connected to the air inlet pipe, a plurality of air inlet holes corresponding one-to-one with the sliding sleeve are arranged on the pressure plate, the sliding sleeve is connected to the corresponding pressure plate, and the material cavity is connected to the inner cavity of the sliding sleeve through the air inlet hole.

[0013] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, wherein: there is a ventilation channel between the inner ring of the rotating part, the inner ring of the outer mold core, the outer ring of the inner mold core and the outer ring of the air inlet pipe, and a plurality of air vents are arranged on the outer periphery of the inner mold core, and the ventilation channel is connected to the inner cavity of the outer connecting shell body through the air vents.

[0014] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, it further includes a shaking assembly, which includes two shaking actuators corresponding to two support cylinders. Each shaking actuator is connected to a telescopic rod that extends upward and can reciprocate linearly in the height direction. The upper end of the telescopic rod is fixedly connected to a shaking bracket, and a connecting bracket is fixedly connected to the support cylinder. The connecting bracket is hinged to the corresponding shaking bracket.

[0015] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, a fixed plate is fixedly connected between two connecting brackets, a drive motor is fixedly connected to the fixed plate, an output shaft is connected to both ends of the drive motor, a drive gear is connected to the output shaft, and a driven gear that meshes with the drive gear is fixedly connected to the outer ring of the rotating part.

[0016] As a preferred embodiment of the rotational molding device for the plastic inner liner of the hydrogen storage bottle with variable dome thickness in this invention, the material throwing unit further includes an opening and closing component slidably connected inside the material throwing tube. The opening and closing component includes a sliding tube slidably connected inside the material throwing tube. Several pushing steps are arranged on the outer periphery of the sliding tube. A connecting part is fixed at the center of the sliding tube. A sealing part is fixed at the end of the connecting part away from the inner mold core. An annular insertion groove is opened at the end of the material throwing tube away from the inner mold core. A second spring is inserted into the material throwing tube through the insertion groove. The pushing step abuts against one end of the second spring at one end facing the molding cavity. A guide hole is opened at the center of the end of the material throwing tube away from the inner mold core. The sealing part can slide along the guide hole. The sealing parts on both sides of the connecting part have sliding surfaces inclined towards the direction of the outer mold core. Two independent sliding ports are formed between the two sides of the connecting plate, the inner side of the sliding tube, and the sliding surfaces. When the sealing part passes through the guide hole and enters the molding cavity, the sliding port and the molding cavity are connected.

[0017] Compared with the prior art, this invention has the following technical effects: In the initial state, before molding, the position of the outer mold is adjusted according to the required thickness of the dome on the left and right sides, causing the first clutch to activate. The pressure block on the first clutch engages in the first locking groove, connecting the support cylinder and the mold, restricting the movement of the mold, causing the rotating component to rotate, which in turn drives the outer mold to rotate. The outer mold rotates under the action of the rotating part, controlling the direction of movement of the outer mold, causing the outer mold to rotate in the required direction. When the gap between the inner edge of the outer mold and the outer edge of the outer mold core reaches the required distance, the rotating component stops rotating; the first clutch stops activating, the pressure block on the first clutch leaves the first locking groove, the mold disengages from the support cylinder, the second clutch activates, the pressure block on the second clutch inserts into the corresponding third locking groove, the rotating component connects to the mold, and gas and plastic granules are introduced into the material cavity through the mixing pipe, filling the material cavity with plastic granules. The process begins by stopping the flow of plastic granules into the cavity, causing the rotating component to rotate and the mold to spin. A portion of the high-pressure gas blows the plastic granules into the ejector tube. The one-way valve for air intake opens, and another portion of the gas enters the pressure housing through the sliding sleeve and air intake pipe, pushing the pressure plate towards the cavity and further pressurizing the plastic granules. A metal block slides within the pressure housing, and the centrifugal force of the metal block further pressurizes the pressure plate, compressing the plastic granules. Simultaneously, gas is introduced into the pressure housing through the ventilation channel and further into the outer connecting housing through the vent. The ejector tube moves towards the molding cavity, the sealing part leaves the guide hole, and the plastic granules are ejected into the molding cavity. Gas supply stops, the feeding process ends, the second spring resets, and the sealing part moves back to the guide hole position, sealing the end where the ejector tube connects to the outer mold core, improving molding reliability. This invention assists in completing rotational molding. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0020] Figure 3 This is a partial three-dimensional structural diagram of the present invention.

[0021] Figure 4 for Figure 3 A magnified view of a section at point B in the middle.

[0022] Figure 5 This is a diagram showing the internal structure of the pressurization component in this invention.

[0023] Figure 6 for Figure 5 A magnified view of a section at point C.

[0024] Figure 7 Internal structure diagram of the material throwing unit in this invention.

[0025] Figure 8 This is a top view of the present invention.

[0026] Figure 9 for Figure 8 The view at point DD.

[0027] Figure 10 This is a three-dimensional structural diagram of the mold in this invention.

[0028] In the diagram, 100 is the rocking assembly, 101 is the rocking driver, 102 is the connecting bracket, 103 is the telescopic rod, 104 is the rocking bracket, 105 is the drive gear, 106 is the output shaft, 107 is the drive motor, 108 is the fixing plate, 200 is the support assembly, 201 is the support cylinder, 201a is the first locking groove, 202 is the rotating part, 202a is the locking block, 203 is the driven gear, 204 is the first clutch, 205 is the second clutch, 300 is the molding assembly, 301 is the outer mold, 301a is the second locking groove, 302 is the mold outer cylinder, 303 is the material mold, 303a is the outer mold core, 303a-1 is the rotating part, 303a-1a is the third locking groove, 303b is the inner mold core, 3 03b-1 Material cavity, 303b-2 Mixing pipe, 304 Discharge unit, 304a Discharge pipe, 304b Opening and closing part, 304b-1 Sealing part, 304b-2 Connecting part, 304b-3 Sliding pipe, 304b-4 Sliding port, 304b-5 Sliding surface, 400 Pressurization assembly, 401 Pressurization housing, 401a Center connecting housing body, 401b Outer connecting housing body, 402 Pressurization plate, 403 Support sleeve, 404 Sliding sleeve, 405 Air inlet pipe, 406 Support rod, 407 Air inlet check valve, 408 First spring, 409 Metal block, 410 Support ring, 410a Air inlet, X Forming cavity, S Ventilation channel. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1 Reference Figure 1 and Figure 2 This embodiment provides a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness, which can process plastic liners with different dome thicknesses according to actual needs.

[0033] A rotational molding apparatus for a plastic inner liner of a hydrogen storage cylinder with variable dome thickness includes a support assembly 200, which includes two support cylinders 201 that are axially opposite to each other and spaced apart. Rotating components 202 are rotatably connected to both support cylinders 201. A molding assembly 300 is connected between the two support cylinders 201.

[0034] The molding component 300 includes two outer molds 301 that can simultaneously face each other or move away from each other. A mold outer cylinder 302 is inserted between the two outer molds 301. The two outer molds 301 are disposed between two support cylinders 201. A material mold 303 is connected inside the outer molds 301. The material mold 303 includes an inner mold core 303b and an outer mold core 303a arranged coaxially. Rotating parts 303a-1 are fixed at the left and right ends of the outer mold core 303a, respectively. The rotating parts 303a-1 and the outer molds 301 are connected. The inner mold core 303b has several ejector units 304 arranged on the outer edges of its left and right ends. Each ejector unit 304 includes an ejector tube 304a fixed to the outer edge of the inner mold core 303b. The end of the ejector tube 304a away from the inner mold core 303b is fixedly connected to the outer mold core 303a. A closed molding cavity X is formed between the outer edge of the outer mold core 303a, the inner edges of the two outer molds 301, and the inner edge of the outer mold cylinder 302. The inner cavity of the ejector tube 304a can communicate with the molding cavity X.

[0035] Specifically, the inner rings of the two outer molds 301 are threadedly connected to the outer rings of the two rotating parts 303a-1, respectively. The rotating parts 303a-1 are equipped with a first clutch 204. The inner ring of the support cylinder 201 has several first engaging slots 201a that correspond one-to-one with several pressing blocks of the first clutch 204. The pressing blocks of the first clutch 204 can engage in the first engaging slots 201a. The two outer molds 301 can move synchronously towards or away from each other. The rotating parts 202 are corresponding to each other. A number of locking blocks 202a are arranged on one side of the outer mold 301. A number of second locking grooves 301a corresponding to the locking blocks 202a are arranged on the outer edge of the outer mold 301 relative to the rotating part 202. The locking blocks 202a are locked in the corresponding second locking grooves 301a. The rotating part 202 is also provided with a second clutch 205. A number of third locking grooves 303a-1a corresponding to the pressure blocks on the second clutch 205 are arranged on the rotating part 303a-1.

[0036] In the initial state, before molding, the position of the outer mold 301 is adjusted according to the thickness of the dome and end cap of the plastic inner liner, causing the first clutch 204 to activate. The pressure block on the first clutch 204 is engaged in the first locking groove 201a. The support cylinder 201 is connected to the material mold 303, restricting the movement of the material mold 303, causing the rotating part 202 to rotate, which in turn drives the outer mold 301 to rotate. The outer mold 301 rotates under the action of the rotating part 303a-1, controlling the rotation direction of the rotating part 202 to adjust the movement direction of the outer mold 301, so that the outer mold 301 rotates in the required direction. When the gap between the inner edge of the outer mold 301 and the outer edge of the outer mold core 303a reaches the required distance, the rotating part 202 stops rotating to assist in the processing of plastic inner liners with different dome thicknesses. The first clutch 204 stops operating, the pressure block on the first clutch 204 leaves the first locking groove 201a, and the material mold 303 disengages from the support cylinder 201.

[0037] Specifically, a fixed plate 108 is fixedly connected between the two connecting brackets 102, a drive motor 107 is fixedly connected to the fixed plate 108, an output shaft 106 is connected to both ends of the drive motor 107, a drive gear 105 is connected to the output shaft 106, and a driven gear 203 that meshes with the drive gear 105 is fixedly connected to the outer ring of the rotating part 202.

[0038] When the rotating part 202 needs to rotate, the drive motor 107 is activated, the output shaft 106 rotates, the output shaft 106 drives the drive gear 105 to rotate, the drive gear 105 drives the rotating part 202 to rotate via the driven gear 203, thereby controlling the direction of the drive motor 107 and adjusting the direction of rotation of the rotating part 202; when the drive motor 107 stops, the rotating part 202 stops rotating.

[0039] Both the first clutch 204 and the second clutch 205 are existing technologies, and their specific structures are not shown. One end of the mixing pipe 303b-2, away from the inner mold core 303b, passes through a rotatable pipe, and the other end of the pipe is rotatably connected to a tee pipe. When the second clutch 205 is activated, the pressure block on the second clutch 205 inserts into the corresponding third locking groove 303a-1a (e.g., ...). Figure 9 As shown), the rotating part 202 is connected to the mold 303; gas and plastic granules are introduced into the pipe through the three-way pipe. The plastic granules fill the material cavity 303b-1. When the introduction of plastic granules stops, the drive motor 107 is activated, causing the rotating part 202 to rotate and the mold 303 to rotate. The plastic granules are thrown into the molding cavity X through the throwing pipe 304a, thus realizing the feeding of plastic granules.

[0040] Example 2 Reference Figures 3-6 and Figures 8-10This embodiment provides a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness. This embodiment is based on the previous embodiment and can further assist the plastic particles in being pressed into the molding cavity X.

[0041] Specifically, it also includes a pressure assembly 400 disposed at the inner mold core 303b. The pressure assembly 400 includes a support ring 410 fixed inside the inner mold core 303b. A pressure housing 401 is fixedly connected inside the support ring 410. The pressure housing 401 includes a central connecting housing body 401a. Several outer connecting housing bodies 401b are arranged in the circumferential direction of the central connecting housing body 401a. Several partitions corresponding one-to-one with the outer connecting housing bodies 401b are fixed inside the central connecting housing body 401a. A first spring 408 is connected to one side of the partition relative to the outer ring of the outer connecting housing body 401b. The end of the first spring 408 away from the partition is connected to... A metal block 409 is slidably connected within the outer connecting housing body 401b. Pressure plates 402 are movably connected to both ends of the pressure housing 401 in the axial direction, sliding along the inner side of the support ring 410. A material cavity 303b-1 is formed between the side of the two pressure plates 402 that is far apart from each other and the inner edge of the inner mold core 303b. The inner cavity of the discharge pipe 304a communicates with the material cavity 303b-1. Mixing pipes 303b-2 for facilitating the introduction of gas and materials are fixed to both ends of the inner mold core 303b in the axial direction. When the metal block 409 moves away from the partition, the pressure plates 402 move in the direction corresponding to the mixing pipes 303b-2. Support sleeves 403 are fixed to the left and right ends of the outer housing body 401b, away from the center connecting housing body 401a. Support rods 406 are slidably connected to the support sleeves 403. The end of the support rod 406 away from the outer connecting housing body 401b is fixedly connected to the pressure plate 402. Inlet pipes 405 are also fixed to the left and right ends of the outer connecting housing body 401b. An intake check valve 407 is connected to the end of the intake pipe 405 close to the outer connecting housing body 401b. This is prior art, and its specific structure is not shown. The intake check valve 407 ensures that gas can only be delivered from the intake pipe 405 into the pressure housing 401, and gas inside the pressure housing 401 cannot be... The material is fed into the air inlet pipe 405. A sliding sleeve 404 is slidably connected to the air inlet pipe 405. Several air inlets corresponding to the sliding sleeve 404 are arranged on the pressure plate 402. The sliding sleeve 404 is connected to the corresponding pressure plate 402. The material cavity 303b-1 is connected to the inner cavity of the sliding sleeve 404 through the air inlet. There is a ventilation channel S between the inner ring of the rotating part 303a-1, the inner ring of the outer mold core 303a, the outer ring of the inner mold core 303b and the outer ring of the air inlet pipe 405. Several air vents are arranged on the outer periphery of the inner mold core 303b. An air inlet 410a connected to the air vent is arranged on the supporting ring 410. The ventilation channel S is connected to the inner cavity of the outer connecting shell body 401b through the air vent.

[0042] A pressure limiting valve is also connected to the supporting ring 410 on the outer periphery of the outer connecting housing body 401b. One end of the pressure limiting valve is connected to the inner cavity of the outer connecting housing body 401b, and the other end is connected to the ventilation channel S. The pressure limiting valve is prior art and is not shown in this application, but it does not affect the understanding of this structural setting by those skilled in the art. The ventilation channel S is connected to an external air storage tank via a rotating pipe. A first check valve is connected to the air storage tank, which allows the gas in the air storage tank to be transported into the rotating pipe. A second check valve is connected to the rotating pipe, which, when opened, allows the gas in the ventilation channel S to be transported to the outside. A portion of the high-pressure gas blows the plastic particles into the discharge pipe 304a, and the inlet check valve 407 opens. Another portion of the gas enters the pressurized area through the sliding sleeve 404 and the inlet pipe 405. Inside the housing 401, the pressure plate 402 is pushed to move towards the material chamber 303b-1, further pressurizing the plastic granules. The metal block 409 slides inside the pressure housing 401, and the centrifugal force of the metal block 409 further pressurizes the pressure plate 402, further compressing the plastic granules. At the same time, gas is introduced into the pressure housing 401 through the ventilation channel S, and further enters the outer connecting housing body 401b through the ventilation port, further pressurizing the pressure plate 402, so that the plastic granules can be smoothly thrown into the molding cavity X. In addition, when the pressure inside the outer connecting housing body 401b exceeds the set threshold, the pressure relief valve opens, allowing the gas inside the outer connecting housing body 401b to be discharged outward through the ventilation channel S. The pressure inside the outer connecting housing body 401b is maintained within the set range, stably providing pressure to the pressure plate 402.

[0043] Example 3 Reference Figure 1 This embodiment provides a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness. Based on the above two embodiments, this embodiment can further improve the uniformity of plastic particle distribution in the molding cavity X.

[0044] Specifically, it also includes a rocking assembly 100, which includes two rocking actuators 101 corresponding to two support cylinders 201. The rocking actuators 101 are connected to telescopic rods 103 that extend upward and can reciprocate linearly in the height direction. The upper end of the telescopic rods 103 is fixedly connected to a rocking bracket 104. The support cylinders 201 are fixedly connected to a connecting bracket 102, which is hinged to the corresponding rocking bracket 104.

[0045] During feeding, the two rocking actuators 101 are controlled to move, and the two telescopic rods 103 move in the height direction. The telescopic rods 103 drive the support cylinder 201 to move via the rocking bracket 104. By adjusting the height position of the two telescopic rods 103 respectively, the two connecting brackets 102 are tilted in different directions, so that the plastic particles inside the molding cavity X are rocked, thereby improving the uniformity of the distribution of several plastic particles inside the molding cavity X.

[0046] Example 4 Reference Figure 7 This embodiment provides a rotational molding apparatus for a hydrogen storage bottle plastic liner with variable dome thickness. This embodiment is based on the above three embodiments and can improve the reliability of molding.

[0047] Specifically, the material throwing unit 304 also includes an opening and closing component 304b slidably connected within the material throwing tube 304a. The opening and closing component 304b includes a sliding tube 304b-3 slidably connected to the inner side of the material throwing tube 304a. Several pushing steps are arranged on the outer periphery of the sliding tube 304b-3. A connecting part 304b-2 is fixed at the center of the sliding tube 304b-3. A sealing part 304b-1 is fixed at the end of the connecting part 304b-2 away from the inner mold core 303b. An annular insertion groove is opened at the end of the material throwing tube 304a away from the inner mold core 303b. A second spring is inserted into the material throwing tube 304a through the insertion groove. The pushing steps move towards the forming... One end of cavity X abuts against one end of the second spring. A guide hole is opened at the center of the end of the ejector tube 304a away from the inner mold core 303b. The sealing part 304b-1 can slide along the guide hole. The sealing parts 304b-1 on both sides of the connecting part 304b-2 have sliding surfaces 304b-5 that are inclined towards the direction of the outer mold core 303a. Two independent sliding ports 304b-4 are formed between the two sides of the connecting plate, the inner side of the ejector tube 304b-3 and the sliding surface 304b-5. When the sealing part 304b-1 passes through the guide hole and enters the molding cavity X, the sliding port 304b-4 and the molding cavity X are connected.

[0048] Multiple gas streams enter the ejector tube 304a, pushing the slide tube 304b-3 towards the direction of the molding cavity X. The sealing part 304b-1 leaves the guide hole, and the plastic particles are ejected into the molding cavity X through the slide port 304b-4. Gas supply stops, the feeding ends, and the slide tube 304b-3 resets under the action of the second spring. The sealing part 304b-1 moves back to the position of the guide hole, sealing the end where the ejector tube 304a connects to the outer mold core 303a, preventing the plastic shell from reversing into the ejector tube 304a (e.g., ...). Figure 7 (as shown in the diagram), to improve the reliability of molding.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A rotational molding apparatus for a plastic inner liner of a hydrogen storage cylinder with variable dome thickness, characterized in that: It includes; The support assembly (200) includes two support cylinders (201) that are axially opposite to each other and spaced apart, and each support cylinder (201) is rotatably connected to a rotating component (202); A molding assembly (300) includes two outer molds (301) that can simultaneously face each other or move away from each other. A mold outer cylinder (302) is inserted between the two outer molds (301). The two outer molds (301) are arranged between two support cylinders (201). A material mold (303) is connected inside the outer mold (301). The material mold (303) includes an inner mold core (303b) and an outer mold core (303a) arranged coaxially. Rotating parts (303a-1) are fixed at the left and right ends of the outer mold core (303a). 1) Connected to the outer mold (301), the outer edges of the left and right ends of the inner mold core (303b) are respectively arranged with a plurality of ejector units (304). The ejector unit (304) includes an ejector tube (304a) fixed to the outer edge of the inner mold core (303b). The end of the ejector tube (304a) away from the inner mold core (303b) is fixedly connected to the outer mold core (303a). The outer edge of the outer mold core (303a), the inner edges of the two outer molds (301) and the inner edge of the mold outer cylinder (302) form a closed molding cavity (X). The inner cavity of 04a) can communicate with the forming cavity (X); the inner rings of the two outer molds (301) are respectively threadedly connected to the outer rings of the two rotating parts (303a-1), the rotating parts (303a-1) are provided with a first clutch (204), the inner ring of the support cylinder (201) has a plurality of first snap-fit ​​grooves (201a) corresponding one-to-one with a plurality of pressure blocks of the first clutch (204), the pressure blocks of the first clutch (204) can be snapped into the first snap-fit ​​grooves (201a), and the two outer molds (301) can move towards each other synchronously or The rotating part (202) has several locking blocks arranged on one side of the outer mold (301) relative to each other. The outer edge of the outer mold (301) relative to the rotating part (202) has several second locking grooves that correspond one-to-one with the locking blocks. The locking blocks are locked in the corresponding second locking grooves. The rotating part (202) is also provided with a second clutch (205). The rotating part (303a-1) has several third locking grooves (303a-1a) that correspond one-to-one with the several pressure blocks on the second clutch (205).

2. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 1, characterized in that: It also includes a pressure assembly (400) disposed at the inner mold core (303b). The pressure assembly (400) includes a pressure housing (401) fixed inside the inner mold core (303b). The pressure housing (401) includes a central connecting housing body (401a). A plurality of outer connecting housing bodies (401b) are arranged in the circumferential direction of the central connecting housing body (401a). A plurality of partitions corresponding one-to-one with the outer connecting housing bodies (401b) are fixed inside the central connecting housing body (401a). A first spring (408) is connected to one side of the partition relative to the outer ring of the outer connecting housing body (401b). The end of the first spring (408) away from the partition is connected to a sliding connection to the outer connecting housing. The metal block (409) inside the main body (401b) is movably connected to the two ends of the pressure shell (401) in the axial direction, and the pressure plate (402) is slidably connected along the inner side of the inner mold core (303b). There is a material cavity (303b-1) between the side of the two pressure plates (402) that is far away from each other and the inner edge of the inner mold core (303b). The inner cavity of the throwing pipe (304a) is connected to the material cavity (303b-1). The two ends of the inner mold core (303b) in the axial direction are respectively fixed with mixing pipes (303b-2) for easy introduction of gas and materials. When the metal block (409) moves away from the partition, the pressure plate (402) moves in the direction of the corresponding mixing pipe (303b-2).

3. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 2, characterized in that: Support sleeves (403) are fixed at the left and right ends of the outer connecting housing body (401b) away from the central connecting housing body (401a). A support rod (406) is slidably connected to the support sleeve (403). The end of the support rod (406) away from the outer connecting housing body (401b) is fixedly connected to the pressure plate (402).

4. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 3, characterized in that: The left and right ends of the outer connecting housing body (401b) are respectively fixed with air inlet pipes (405), and a sliding sleeve (404) is slidably connected to the air inlet pipe (405). A number of air inlet holes corresponding to the sliding sleeve (404) are arranged on the pressure plate (402). The sliding sleeve (404) is connected to the corresponding pressure plate (402). The material chamber (303b-1) is connected to the inner cavity of the sliding sleeve (404) through the air inlet holes.

5. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 4, characterized in that: The inner ring of the rotating part (303a-1), the inner ring of the outer mold core (303a), the outer ring of the inner mold core (303b), and the outer ring of the air inlet pipe (405) have a ventilation channel (S). Several air vents are arranged on the outer periphery of the inner mold core (303b). The ventilation channel (S) is connected to the inner cavity of the outer connecting shell body (401b) through the air vents.

6. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in any one of claims 1 to 4, characterized in that: It also includes a rocking assembly (100), which includes a rocking driver (101) corresponding to each of the two support cylinders (201). The rocking driver (101) is connected to a telescopic rod (103) that extends upward and can reciprocate linearly in the height direction. The upper end of the telescopic rod (103) is fixedly connected to a rocking bracket (104). The support cylinder (201) is fixedly connected to a connecting bracket (102), which is hinged to the corresponding rocking bracket (104).

7. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 6, characterized in that: A fixing plate (108) is fixedly connected between two connecting brackets (102). A drive motor (107) is fixedly connected to the fixing plate (108). An output shaft (106) is connected to each end of the drive motor (107). A drive gear (105) is connected to the output shaft (106). A driven gear (203) that meshes with the drive gear (105) is fixedly connected to the outer ring of the rotating part (202).

8. The rotational molding apparatus for the plastic inner liner of a hydrogen storage cylinder with variable dome thickness as described in claim 7, characterized in that: The material throwing unit (304) further includes an opening and closing component (304b) slidably connected within the material throwing tube (304a). The opening and closing component (304b) includes a sliding tube (304b-3) slidably connected to the inner side of the material throwing tube (304a). Several pushing steps are arranged on the outer periphery of the sliding tube (304b-3). A connecting part (304b-2) is fixed at the center of the sliding tube (304b-3). A sealing part (304b-1) is fixed at the end of the connecting part (304b-2) away from the inner mold core (303b). An annular insertion groove is opened at the end of the material throwing tube (304a) away from the inner mold core (303b). A second spring is inserted into the material throwing tube (304a) through the insertion groove. The pushing steps are directed towards the forming... One end of the cavity (X) abuts against one end of the second spring. The center of the end of the ejector tube (304a) away from the inner mold core (303b) has a guide hole. The sealing part (304b-1) can slide along the guide hole. The sealing parts (304b-1) on both sides of the connecting part (304b-2) have sliding surfaces (304b-5) that are inclined towards the direction of the outer mold core (303a). Two independent sliding ports (304b-4) are formed between the two sides of the connecting plate, the inside of the sliding tube (304b-3), and the sliding surface (304b-5). When the sealing part (304b-1) passes through the guide hole and enters the molding cavity (X), the sliding port (304b-4) and the molding cavity (X) are connected.

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