Rotational Molding Device for the Inner Liner of Type IV Hydrogen Storage Vessels

Abstract

The present invention provides a rotational molding device for the inner liner of a type-IV hydrogen storage container, belonging to the technical field of rotational molding. It solves the problem that the opening and closing of the rotational molding die is inconvenient when the existing rotational molding device processes the inner liner of a type-IV hydrogen storage container. The tube body forming section of the rotational molding device for the inner liner of a type-IV hydrogen storage container is rotationally connected to the rotating frame through a support rotating member, the first hemispherical forming section is connected to the tube body forming section through a first linear guiding assembly, a second linear guiding assembly is installed on the tube body forming section, and the second hemispherical forming section is rotationally connected to the second linear guiding assembly through a rotating shaft. The first linear guiding assembly provides an effective supporting force for the first hemispherical forming section, and the second linear guiding assembly provides an effective supporting force for the second hemispherical forming section, so that the operator can easily move the first hemispherical forming section and the first hemispherical forming section without the assistance of a lifting tool, significantly improving the convenience of opening and closing the rotational molding die.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotational molding, and relates to a rotational molding device, in particular to a rotational molding device for the inner liner of a type IV hydrogen storage container. Background Art

[0002] The type IV hydrogen storage container is an advanced container in high-pressure hydrogen storage technology, mainly used in fields such as hydrogen fuel cell vehicles, hydrogen refueling stations, and distributed energy systems. The two ends of the inner liner of the type IV hydrogen storage container are valve seats made of metal, and the rest are made of non-metallic materials such as high-density polyethylene (HDPE) or polyamide (PA), which have the characteristics of corrosion resistance and light weight. For example, the rotational molding inner liner for a type IV hydrogen storage bottle disclosed in Chinese patent literature (application number 202321259711.1), as well as ISO11439:2013 and ISO15869:2009.

[0003] Rotational molding, also known as rotomolding, rotational forming, rotary forming, etc., is a method for blow molding hollow thermoplastic plastics. In this method, plastic raw materials are first added to the mold, and then the mold rotates continuously along two perpendicular axes and is heated. Under the action of gravity and heat energy, the plastic raw materials in the mold gradually and evenly coat, melt, and adhere to the entire surface of the mold cavity, forming the required shape, and then cooled and shaped into a product. At present, many people have tried to apply the rotational molding process to the production of the inner liner of type IV hydrogen storage containers; for example, a rotational molding device and molding method for the plastic inner liner of a high-pressure hydrogen storage bottle disclosed in Chinese patent literature (application number 202210695343.9), an electrically heated rotational molding die for a hydrogen storage bottle (application number 202320271741.8), a quick-opening mechanism for a rotational molding machine for hydrogen storage bottles (application number 202321886737.9), and a rotational molding process for the plastic inner liner of a type IV hydrogen storage bottle (202310910938.6).

[0004] Existing rotational molding devices for processing the inner liner of type IV hydrogen storage containers and the products produced still have some deficiencies. For example, when the product is taken out of the rotational molding die of the rotational molding device and when the mold is re-closed, a lifting tool is required to assist in lifting the two end covers, and multiple people need to cooperate, resulting in low production efficiency and high production costs. Another example is that the qualification rates of the connection strength and sealing performance between the valve seat and the non-metallic shell in the product are relatively low. For this reason, various solutions have also been proposed. For example, the rotational molding inner liner for a type IV hydrogen storage bottle recorded in Chinese patent literature (202321259711.1) has good sealing performance and ensures the stable installation of the valve seat by adjusting the connection structure between the two. Summary of the Invention

[0005] The present invention provides a rotational molding device for the inner liner of a type IV hydrogen storage container. The technical problem to be solved by the present invention is how to improve the convenience of opening and closing the rotational molding die when processing the inner liner of a type IV hydrogen storage container using the rotational molding device.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions: A rotational molding device for the inner liner of a type-IV hydrogen storage container includes a rotating frame and a rotational molding die. The rotational molding die includes a tube body forming section, a first hemispherical forming section and a second hemispherical forming section respectively located at both ends of the main body forming section. Both between the first hemispherical forming section and the tube body forming section and between the second hemispherical forming section and the tube body forming section are connected by detachable fixing connection components; between the tube body forming section and the rotating frame are rotationally connected by a plurality of supporting rotating members sleeved outside the tube body forming section, and the rotational molding die can rotate around the axis of the tube body forming section; a motor is installed on the rotating frame, and the main shaft of the motor is connected to the tube body forming section through a transmission component;

[0007] Handles are installed on both the first hemispherical forming section and the second hemispherical forming section; between the tube body forming section and the first hemispherical forming section is also connected by a first linear guiding component having a first guiding rod and a first sliding member. When the first hemispherical forming section and the tube body forming section are in a disassembled state, the first hemispherical forming section can translate along the axis direction of the tube body forming section; a second linear guiding component having a second guiding rod and a second sliding member is installed on the tube body forming section, and the second hemispherical forming section is rotationally connected to the second guiding rod or the second sliding member through a rotating shaft. When the second hemispherical forming section and the tube body forming section are in a disassembled state, the second hemispherical forming section can not only translate along the axis direction of the tube body forming section, but also swing around the rotating shaft.

[0008] After the processing of the inner liner of the type-IV hydrogen storage container by the rotational molding device is completed, when demolding, first open the first hemispherical forming section and the second hemispherical forming section without a specific order, and then pull the product out along its axis direction.

[0009] The process of opening the first hemispherical forming section is to first operate the detachable fixing connection component to make the first hemispherical forming section and the tube body forming section in a disassembled state, and then hold the handle and apply a pulling force along the axis direction of the tube body forming section to the first hemispherical forming section. The first hemispherical forming section will move along the guiding direction of the first linear guiding component, thereby ensuring that the first hemispherical forming section is completely separated from the product and providing a large enough space for installing the valve seat. The process of closing the first hemispherical forming section is the reverse operation of the process of opening the first hemispherical forming section, and will not be described in detail here.

[0010] When opening the second hemisphere forming section, first operate the detachable fixed connection component to make the second hemisphere forming section and the pipe body forming section in a disassembled state. Then hold the handle and apply a pulling force to the second hemisphere forming section along the axis direction of the pipe body forming section. The second hemisphere forming section will move along the guiding direction of the second linear guiding component. During this process, adaptively control the swing of the second hemisphere forming section until the second hemisphere forming section does not block the port of the pipe body forming section. Thus, not only can it ensure that the product can be smoothly taken out from this port, but also it provides enough space for installing the valve seat. Closing the second hemisphere forming section is the reverse operation of opening the second hemisphere forming section, which will not be described in detail here.

[0011] Generally speaking, the first linear guiding component provides effective supporting force for the first hemisphere forming section, and the second linear guiding component provides effective supporting force for the second hemisphere forming section, enabling the operator to easily move the first hemisphere forming section and the second hemisphere forming section without the assistance of a lifting tool. This significantly improves the convenience of opening and closing the rotational molding die, shortens the production interval time, improves production efficiency, and reduces the number of required operators.

[0012] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the axis of the first guiding rod in the first linear guiding component is arranged parallel to the axis of the pipe body forming section, and the number of the first linear guiding components is multiple groups; the multiple groups of first linear guiding components are arranged circumferentially around the pipe body forming section.

[0013] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the axis of the second guiding rod in the second linear guiding component is arranged parallel to the axis of the pipe body forming section, the number of the second linear guiding components is multiple groups, the multiple groups of second linear guiding components are arranged on the same plane on the same side of the pipe body forming section, and the second hemisphere forming main body is connected to the second guiding rod or the second sliding member in each group of second linear guiding components through a rotating shaft.

[0014] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the rotating locking member can adopt any of the following schemes. First, the rotating locking member is an elastic pin inserted and installed on the second guiding rod, and a jack matching the end of the elastic pin is arranged on the second hemisphere forming section. When the end of the elastic pin is embedded in the jack, the rotating locking member makes the second hemisphere forming section and the second guiding rod in a rotationally locked state. Second, the rotating locking member is a wrench rotatably installed on the second hemisphere forming section, and a limiting surface matching the wrench is provided on the second guiding rod. When the wrench contacts the limiting surface of the second guiding rod by rotation, the rotating locking member makes the second hemisphere forming section and the second guiding rod in a rotationally locked state.

[0015] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the first hemispherical forming section includes a first hemispherical forming main body, and the second hemispherical forming section includes a second hemispherical forming main body. A plurality of heating wires are arranged on the outer side surface of the pipe body forming section, the outer side surface of the first hemispherical forming main body, and the outer side surface of the second hemispherical forming main body. The plurality of heating wires are arranged along the axial line direction of the rotational molding die; the rotational molding device for the inner liner of a type-IV hydrogen storage container further includes a control circuit, and the control circuit is electrically connected to a temperature monitoring sub-circuit for monitoring the temperature of the side wall of the cavity of the rotational molding die in sections. The rotational molding die is divided into 8 to 15 temperature measurement regions along its axial line direction; the plurality of heating wires are all electrically connected to the control circuit, and the control circuit can independently control whether the heating wires in the corresponding sections are energized according to the monitoring values of the temperature monitoring sub-circuit.

[0016] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the first hemispherical forming section includes a first hemispherical forming main body and a first joint assembly that can be threadedly connected to the valve seat. The middle part of the first hemispherical forming main body has a first avoidance hole and a positioning surface that matches the valve seat. The first joint assembly is arranged in the first avoidance hole. A first bracket is fixed on the first hemispherical forming main body. The outer end of the first joint assembly is connected to the first bracket through a locking assembly. The locking assembly can make the first joint assembly in an axially locked state or an axially unlocked state relative to the first bracket. When the first joint assembly is connected to the valve seat, the valve seat contacts the positioning surface, and the locking assembly makes the first joint assembly in an axially locked state relative to the first bracket, the valve seat is in a fixed state.

[0017] During the product cooling and forming process, the locking assembly is manipulated to switch the state of the first joint assembly relative to the first bracket from the axially locked state to the axially unlocked state. As a result, the valve seat at one end of the product is released, significantly reducing the problems of the decrease in the connection strength and sealing performance between the valve seat and the non-metallic shell caused by the cooling shrinkage of the material, and thus significantly improving the product qualification rate.

[0018] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, a first cooling cavity is provided between the valve seat and the first hemispherical forming main body. The first hemispherical forming main body is provided with a plurality of first ventilation holes communicating with the first cooling cavity. During the product cooling and forming process, flowing air is injected into the first cooling cavity through the first ventilation holes, so that the valve seat area of the product is cooled and formed prior to the remaining areas, which also significantly reduces the problems of the decrease in the connection strength and sealing performance between the valve seat and the non-metallic shell caused by the cooling shrinkage of the material, and thus significantly improves the product qualification rate.

[0019] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the second hemispherical forming section includes a second hemispherical forming main body; first annular grooves are provided on the inner side surfaces of both the first hemispherical forming main body and the second hemispherical forming main body, and a plurality of first vacuum connection holes communicating with the first annular grooves are provided on both the first hemispherical forming main body and the second hemispherical forming main body; when valve seats of the inner liner of the type-IV hydrogen storage container are pre-installed on both the first hemispherical forming main body and the second hemispherical forming main body, sealing rings are installed between the valve seat and the first hemispherical forming main body and between the valve seat and the second hemispherical forming main body; the first annular grooves are located in the overlapping areas of the inner side surfaces of the first hemispherical forming main body and the valve seat projection and in the overlapping areas of the inner side surfaces of the second hemispherical forming main body and the valve seat projection.

[0020] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, flange portions are provided on both the first hemispherical forming main body, the second hemispherical forming main body and the tube forming section, and sealing rings are also installed between the flange portion of the first hemispherical forming main body and the flange portion of the tube forming section and between the flange portion of the second hemispherical forming main body and the flange portion of the tube forming section; second annular grooves are provided on the side surfaces of the flange portions at both ends of the tube forming section, and a plurality of second vacuum connection holes communicating with the second annular grooves are provided on the flange portions of both the first hemispherical forming main body and the second hemispherical forming main body.

[0021] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the first hemispherical forming section further includes a first joint assembly that can be threadedly connected to the valve seat, and an air inlet hole communicating with the inner cavity of the inner liner of the type-IV hydrogen storage container is provided in the first joint assembly; heating rods are installed in the first joint assembly, and the first joint assembly can be heated by controlling the energization of the heating rods.

[0022] In the above-mentioned rotational molding device for the inner liner of a type-IV hydrogen storage container, the second hemispherical forming section further includes a second joint assembly that can be threadedly connected to the valve seat, and an exhaust hole communicating with the inner cavity of the inner liner of the type-IV hydrogen storage container is provided on the second joint assembly; heating rods are installed in the second joint assembly, and the second joint assembly can be heated by controlling the energization of the heating rods.

[0023] Compared with the prior art, the rotational molding device for processing the inner liner of a type-IV hydrogen storage container has the advantages of convenient mold opening and closing, convenient product removal, and high processing efficiency. The inner liner of the type-IV hydrogen storage container processed by the rotational molding device has the advantages of high connection strength and high sealing performance between the valve seat and the non-metallic shell, and high product qualification rate. Description of the Drawings

[0024] Figure 1 It is a schematic three-dimensional structure diagram of the rotational molding device.

[0025] Figure 2 and Figure 3 are three-dimensional structural schematic diagrams of the rotational molding die in the closed mold state from different perspectives.

[0026] Figure 4 is Figure 3 an enlarged view of the local structure.

[0027] Figure 5 and Figure 6 are three-dimensional structural schematic diagrams of the rotational molding die in different open mold states.

[0028] Figure 7 is the end face structural schematic diagram of the rotational molding die.

[0029] Figure 8 is Figure 7 the sectional structural schematic diagram of A-A in

[0030] Figure 9 is Figure 8 the enlarged view of the local area at B in

[0031] Figure 10 is Figure 8 the enlarged view of the local area at C in

[0032] Figure 11 is the three-dimensional structural schematic diagram of the first hemispherical forming section.

[0033] Figure 12 is the end face structural schematic diagram of the first hemispherical forming section.

[0034] Figure 13 is Figure 12 the sectional structural schematic diagram of D-D in

[0035] Figure 14 is Figure 13 the enlarged view of the local area at F in

[0036] Figure 15 is Figure 12 the sectional structural schematic diagram of E-E in

[0037] Figure 16 is Figure 15 the enlarged view of the local area at G in

[0038] Figure 17 is the three-dimensional structural schematic diagram of the locking component in the first hemispherical forming section in the axially unlocked state.

[0039] Figure 18 is the three-dimensional structural schematic diagram of the second hemispherical forming section.

[0040] Figure 19It is a schematic diagram of the end face structure of the second hemisphere forming section.

[0041] Figure 20 It is Figure 19 Schematic cross-sectional structure diagram of H-H.

[0042] Figure 21 It is Figure 20 Partial enlarged view at position J of

[0043] In the figure, 100 is a rotating frame; 200 is a rotary joint; 300 is a motor; 400 is the inner liner of a type-IV hydrogen storage container; 40a is a valve seat; 500 is a support rotating part; 600 is a transmission component; 700 is a rotational molding die; 70a is a pipe body forming section; 70b is a first hemisphere forming section; 70c is a second hemisphere forming section; 70d is a detachable fixed connection component; 70e is a heating wire; 70f is a flange part; 70g is a first annular groove; 70h is a first vacuum connection hole; 70j is a second annular groove; 70k is a second vacuum connection hole; 1a is a first hemisphere forming main body; 1b is a first joint assembly; 1b1 is an air inlet hole; 1b2 is a locking mating surface; 1c is a first bracket; 1d is a locking assembly; 1d1 is a cylinder; 1d2 is a locking tongue; 1e is a first cooling cavity; 1f is a first ventilation hole; 2a is a second hemisphere forming main body; 2b is a second joint assembly; 2b1 is an exhaust hole; 2b2 is a temperature measuring hole; 2c is a second cooling cavity; 2d is a second ventilation hole; 3 is a handle; 4 is a first linear guiding assembly; 5 is a second linear guiding assembly; 5a is a second guiding rod; 5b is a second sliding part; 6 is a rotating shaft; 7 is a rotating locking part; 8 is a sealing ring; 9 is a sealing plate; 10 is a heating rod. Detailed implementation manners

[0044] The following are specific embodiments of the present invention and, in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0046] In the present invention, unless otherwise clearly specified or defined, the terms "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified or defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0049] As Figure 1 shown, a rotational molding device for the inner liner 400 of a type-IV hydrogen storage container includes a rotating frame 100, a rotational molding die 700, a rotary joint 200, a motor 300, and a control circuit.

[0050] When this rotational molding device is in use, the rotating frame 100 is fixedly installed on a swing drive device. The inner liner 400 of the type-IV hydrogen storage container includes a non-metallic shell and valve seats 40a at both ends of the shell. The valve seats 40a are pre-installed in the rotational molding die 700, and the rotational molding die 700 is used to mold the shell of the inner liner 400 of the type-IV hydrogen storage container. The motor 300 is installed on the rotating frame 100, and the motor 300 is used to drive the rotational molding die 700 to rotate. The motor 300 is electrically connected to the control circuit. The rotational molding die 700 includes an air pipe and a wire. The rotary joint 200 is installed on the rotating frame 100, and both the air pipe and the wire are connected to the rotary joint 200. The rotary joint 200 prevents the air pipe and the wire from being wound and broken due to the continuous rotation of the rotational molding die 700.

[0051] AsFigures 2 to 6 As shown, the rotational molding die 700 includes a pipe body forming section 70a, a first hemispherical forming section 70b and a second hemispherical forming section 70c respectively located at both ends of the main body forming section. The pipe body forming section 70a is mainly used to form the circular pipe section of the housing, and the first hemispherical forming section 70b and the second hemispherical forming section 70c are mainly used to pre-install the valve seat 40a and form the hemispherical sections at both ends of the housing.

[0052] Both between the first hemispherical forming section 70b and the pipe body forming section 70a and between the second hemispherical forming section 70c and the pipe body forming section 70a are connected by a detachable fixing connection assembly 70d. The specification drawings show that the detachable fixing connection assembly 70d is a bolt and nut assembly, and according to the actual situation, the bolt and nut assembly can be replaced by other structures, such as an electromagnet adsorption connection assembly or a quick snap connection assembly.

[0053] The pipe body forming section 70a and the rotary frame 100 are rotationally connected by a plurality of support rotating members 500 sleeved outside the pipe body forming section 70a. The support rotating members 500 are bearings or roller ring assemblies. The specification drawings show that one end of the pipe body forming section 70a is connected to the rotary frame 100 through a bearing, and the other end is connected to the rotary frame 100 through a roller ring assembly. The rotational molding die 700 can not only rotate stably around the axis of the pipe body forming section 70a, but also has the advantages of low manufacturing cost and convenient disassembly and assembly of the die.

[0054] The main shaft of the motor 300 and the pipe body forming section 70a are connected by a transmission assembly 600. The specification drawings show that the transmission assembly 600 is a gear assembly, and according to the actual situation, the gear assembly can also be replaced by other structures, such as a chain and sprocket assembly.

[0055] The first hemispherical forming section 70b includes a first hemispherical forming main body 1a, the second hemispherical forming section 70c includes a second hemispherical forming main body 2a, and handles 3 are installed on both the first hemispherical forming main body 1a and the second hemispherical forming main body 2a. By providing the handles 3, it is convenient for the operating workers to move and operate the first hemispherical forming section 70b and the second hemispherical forming section 70c.

[0056] The tube forming section 70a is connected to the first hemispherical forming main body 1a of the first hemispherical forming section 70b through a first linear guiding assembly 4 having a first guiding rod and a first sliding member. The axis line of the first guiding rod is arranged parallel to the axis line of the tube forming section 70a. Thus, when the first hemispherical forming section 70b moves, it translates along the axis line direction of the tube forming section 70a. The attached drawings of the specification show that the number of both the first guiding rod and the first sliding member is multiple. The multiple first guiding rods are arranged circumferentially around the tube forming section 70a. The first guiding rod is fixedly connected to the first hemispherical forming main body 1a, and the first sliding member is installed on the tube forming section 70a. By moving the first hemispherical forming section 70b, the first hemispherical forming main body 1a can be completely separated from the cooled and formed inner liner 400 of the type-IV hydrogen storage container.

[0057] A second linear guiding assembly 5 having a second guiding rod 5a and a second sliding member 5b is installed on the tube forming section 70a. The second hemispherical forming main body 2a of the second hemispherical forming section 70c is rotationally connected to the second guiding rod 5a or the second sliding member 5b through a rotating shaft 6. The axis line of the second guiding rod 5a is arranged parallel to the axis line of the tube forming section 70a. Thus, when the second hemispherical forming section 70c moves, it translates along the axis line direction of the tube forming section 70a. The attached drawings of the specification show that the number of both the second guiding rod 5a and the second sliding member 5b is multiple. The multiple second guiding rods 5a are arranged on the same side of the tube forming section 70a. The second hemispherical forming main body 2a is connected to the second guiding rod 5a through the rotating shaft 6, and the second sliding member 5b is installed on the tube forming section 70a. By moving the second hemispherical forming section 70c, the second hemispherical forming main body 2a can be completely separated from the cooled and formed inner liner 400 of the type-IV hydrogen storage container, and by swinging the second hemispherical forming section 70c, the second hemispherical forming section 70c can also be located on the port side of the tube forming section 70a, significantly reducing the influence of the second hemispherical forming section 70c on the demolding operation of the cooled and formed inner liner 400 of the type-IV hydrogen storage container.

[0058] The first sliding member and the second sliding member 5b have the same function. They can use the same components or different components; the first sliding member and the second sliding member 5b are sliding sleeves sleeved on the guiding rod or rollers located outside the guiding rod. The attached drawings of the specification show that the first sliding member is a sliding sleeve fixedly connected to the tube forming section 70a, and the second sliding member 5b is a roller rotatably connected to the tube forming section 70a.

[0059] As Figure 4As shown in the figure, a rotating locking member 7 is installed on the second linear guiding assembly 5. When the second hemispherical forming section 70c is in a facing state with the tube body forming section 70a, the rotating locking member 7 can make the second hemispherical forming main body 2a and the second guiding rod 5a or the second sliding member 5b on the second linear guiding assembly 5 in a rotating locking state. In this way, the second hemispherical forming section 70c can move along the second linear guiding assembly 5 and swing around the rotating shaft 6 in a step-by-step operation, improving the force application efficiency. Especially during demolding, it is more beneficial for the second hemispherical forming section 70c to separate from the inner liner 400 of the type-IV hydrogen storage container. The instruction drawing shows that the rotating locking member 7 is an elastic pin inserted and installed on the second guiding rod 5a, and a jack matching the end of the elastic pin is provided on the second hemispherical forming main body 2a. When the end of the elastic pin is embedded in the jack, the rotating locking member 7 makes the second hemispherical forming main body 2a and the second guiding rod 5a in a rotating locking state; according to the actual situation, the elastic pin can also be replaced by other components, such as a wrench rotatably installed on the second hemispherical forming main body 2a, and a limiting surface matching the wrench is provided on the second guiding rod 5a. When the wrench contacts the limiting surface of the second guiding rod 5a by rotation, the rotating locking member 7 makes the second hemispherical forming main body 2a and the second guiding rod 5a in a rotating locking state.

[0060] As Figures 2 to 6 shown, a plurality of heating wires 70e are provided on the outer side surface of the tube body forming section 70a, the outer side surfaces of the first hemispherical forming main body 1a and the second hemispherical forming main body 2a. The heating wires 70e are electrically connected to the wires, and when the heating wires 70e are energized, they are used to heat the tube body forming section 70a, the first hemispherical forming main body 1a and the second hemispherical forming main body 2a. The plurality of heating wires 70e are all electrically connected to the control circuit, and a temperature monitoring sub-circuit for segmentally monitoring the temperature of the cavity side wall of the rotational molding die 700 is installed on the control circuit, and the number of segments is any value from 3 to 8; the control circuit can independently control the heating wires 70e in the corresponding segment according to the monitoring value of the temperature monitoring sub-circuit.

[0061] As Figures 8 to 10As shown, valve seats 40a are pre-installed on both the first hemispherical forming body 1a and the second hemispherical forming body 2a. Sealing rings 8 are installed between the valve seat 40a and the first hemispherical forming body 1a, and between the valve seat 40a and the second hemispherical forming body 2a. Flange portions 70f are provided on the first hemispherical forming body 1a, the second hemispherical forming body 2a, and the tube forming section 70a. Sealing rings 8 are also installed between the flange portion 70f of the first hemispherical forming body 1a and the flange portion 70f of the tube forming section 70a, and between the flange portion 70f of the second hemispherical forming body 2a and the flange portion 70f of the tube forming section 70a. First annular grooves 70g are provided in the regions where the inner side surfaces of the first hemispherical forming body 1a and the valve seat 40a are projected to coincide, and in the regions where the inner side surfaces of the second hemispherical forming body 2a and the valve seat 40a are projected to coincide. A plurality of first vacuum connection holes 70h communicating with the first annular groove 70g are provided on the first hemispherical forming body 1a and the second hemispherical forming body 2a. Second annular grooves 70j are provided on the side surfaces of the flange portions 70f at both ends of the tube forming section 70a. A plurality of second vacuum connection holes 70k communicating with the second annular groove 70j are provided on the flange portion 70f of the first hemispherical forming body 1a and the flange portion 70f of the second hemispherical forming body 2a. The sealing performance of the inner cavity of the rotational molding mold 700 is significantly improved by the sealing ring 8, and the time required for vacuum pumping is significantly shortened by performing vacuum pumping through a plurality of first vacuum connection holes 70h and second vacuum connection holes 70k, thereby improving the production efficiency.

[0062] As Figures 11 to 17 shown, the first hemispherical forming section 70b further includes a first joint assembly 1b that can be threadedly connected to the valve seat 40a and a first bracket 1c fixedly connected to the outer side surface of the first hemispherical forming body 1a; the first joint assembly 1b is in the shape of a bolt, and an air inlet hole 1b1 communicating with the inner cavity of the rotational molding mold 700 is provided in the first joint assembly 1b. The air inlet hole 1b1 communicates with the above-mentioned air pipe, so that nitrogen can be injected into the mold cavity through the air hole, and flowing air can be injected into the inner cavity of the product through the air hole. The middle part of the first hemispherical forming body 1a has a first avoidance hole and a positioning surface matching the valve seat 40a, and the first joint assembly 1b is inserted into the first avoidance hole. The outer end of the first joint assembly 1b and the first bracket 1c are connected by a locking assembly 1d. The locking assembly 1d can make the first joint assembly 1b in an axially locked state or an axially unlocked state relative to the first bracket 1c. When the first joint assembly 1b is connected to the valve seat 40a, the valve seat 40a contacts the positioning surface, and the locking assembly 1d makes the first joint assembly 1b in an axially locked state relative to the first bracket 1c, the valve seat 40a is in a fixed state.

[0063] The locking assembly 1d includes a cylinder 1d1 and a locking tongue 1d2 fixed to the piston rod of the cylinder 1d1. The cylinder block of the cylinder 1d1 is fixedly installed on the first bracket 1c. The first joint assembly 1b has a locking mating surface 1b2 that cooperates with the locking tongue 1d2. The accompanying drawings of the specification show that the moving direction of the piston rod of the cylinder 1d1 is perpendicular to the axis direction of the first joint assembly 1b. When the piston rod of the cylinder 1d1 is in the extended state, the locking tongue 1d2 contacts the locking mating surface 1b2 on the first joint assembly 1b, that is, the locking tongue 1d2 restricts the first joint assembly 1b from moving towards the inner cavity direction of the rotational molding die 700. The valve seat 40a contacting the positioning surface and the connection between the first joint assembly 1b and the valve seat 40a also restrict the first joint assembly 1b from moving towards the outer side direction of the rotational molding die 700, realizing that the first joint assembly 1b is in an axially locked state relative to the first bracket 1c, and the valve seat 40a is in a fixed state. When the piston rod of the cylinder 1d1 switches from the extended state to the retracted state, the locking tongue 1d2 separates from the first joint assembly 1b, and the first joint assembly 1b can move towards the inner cavity direction of the rotational molding die 700. Shrinkage exists objectively during the product cooling and forming process. This structure and processing technology significantly reduce the excessive stretching between the valve seat 40a and the non-metallic housing, thereby significantly improving the connection strength and sealing performance between the valve seat 40a and the non-metallic housing, and realizing the improvement of the product qualification rate.

[0064] Both the locking mating surface 1b2 and the contact surface of the locking tongue 1d2 that can contact the locking mating surface 1b2 are inclined planes relative to the axis direction of the first joint assembly 1b, that is, the locking tongue 1d2 and the first joint assembly 1b are in an inclined plane fit. This structure can improve the fixing firmness of the valve seat 40a when the first joint assembly 1b is in an axially locked state relative to the first bracket 1c.

[0065] The accompanying drawings of the specification show that the number of locking assemblies 1d is two groups, and the number of locking assemblies 1d can be adaptively increased or decreased according to the actual situation. The two groups of locking assemblies 1d are symmetrically arranged, which can not only improve the force stability of the first joint assembly 1b and the position consistency of the first joint assembly 1b, but also improve the fixing firmness of the valve seat 40a.

[0066] The rotational molding die 700 further includes a temperature sensor for monitoring the air temperature inside the inner liner 400 of the type-IV hydrogen storage container. An electromagnetic valve is connected to the air supply pipeline of the cylinder 1d1. Both the electromagnetic valve and the temperature sensor are electrically connected to the control circuit. When the air temperature inside the inner liner 400 of the type-IV hydrogen storage container drops to the set threshold value, the control circuit controls the electromagnetic valve to retract the piston rod of the cylinder 1d1. The set threshold value is any value in the range of 120°C - 140°C. This structure realizes the automatic switching of the state of the first joint assembly 1b relative to the first bracket 1c, which not only improves the production efficiency but also improves the product quality consistency.

[0067] According to the actual situation, the movement direction of the piston rod of the cylinder 1d1 can be adjusted from being perpendicular to the axis direction of the first joint assembly 1b as described above to being parallel to the axis direction of the first joint assembly 1b. Thus, when the piston rod of the cylinder 1d1 is in the extended state, the locking tongue 1d2 contacts the locking and mating surface 1b2 on the first joint assembly 1b, that is, the locking tongue 1d2 restricts the first joint assembly 1b from moving towards the inner cavity direction of the rotational molding die 700; when the piston rod of the cylinder 1d1 switches from the extended state to the retracted state, the locking tongue 1d2 separates from the first joint assembly 1b and a relatively large distance is formed between them, ensuring that the first joint assembly 1b can move towards the inner cavity direction of the rotational molding die 700.

[0068] As Figures 13 to 16 shown, the valve seat 40a is in a fixed state. There is a first cooling cavity 1e between the outer side surface of the valve seat 40a and the inner side surface of the first hemispherical forming body 1a. A plurality of first ventilation holes 1f communicating with the first cooling cavity 1e are formed on the first hemispherical forming body 1a. During the product cooling and forming process, flowing air is injected into the first cooling cavity 1e through the first ventilation holes 1f, so that the area of the valve seat 40a in the product is cooled and formed prior to the remaining areas. A sealing plate 9 is sleeved on the first joint assembly 1b. The sealing plate 9 is hermetically and fixedly connected to the middle outer end surface of the first hemispherical forming body 1a. The sealing plate 9 is hermetically connected to the first joint assembly 1b and sealed by the sealing ring 8 between the sealing plate 9 and the valve seat 40a and the first hemispherical forming body 1a, significantly improving the sealing performance of the first cooling cavity 1e, reducing heat dissipation during the heating stage, and further more precisely controlling the temperature of the valve seat 40a area, improving the connection strength and sealing performance between the valve seat 40a and the non-metallic housing, as well as the product qualification rate.

[0069] As Figures 17 to 21 shown, the second hemispherical forming section 70c further includes a second joint assembly 2b that can be threadedly connected to the valve seat 40a. The second joint assembly 2b is also in the shape of a bolt, and the second joint assembly 2b can fix the valve seat 40a on the second hemispherical forming body 2a. There is a second cooling cavity 2c between the outer side surface of the valve seat 40a and the inner side surface of the second hemispherical forming body 2a, and a plurality of second ventilation holes 2d communicating with the second cooling cavity 2c are formed on the second hemispherical forming body 2a; the functions of the second cooling cavity 2c and the second ventilation holes 2d are the same as those of the first cooling cavity 1e and the first ventilation holes 1f. A sealing plate 9 is also sleeved on the second joint assembly 2b. The sealing plate 9 is hermetically and fixedly connected to the middle outer end surface of the second hemispherical forming body 2a. The sealing plate 9 is hermetically connected to the second joint assembly 2b and sealed by the sealing ring 8 between the sealing plate 9 and the valve seat 40a and the second hemispherical forming body 2a, significantly improving the sealing performance of the second cooling cavity 2c.

[0070] The second joint assembly 2b is provided with an exhaust hole 2b1 and a temperature measuring hole 2b2, and both the exhaust hole 2b1 and the temperature measuring hole 2b2 can communicate with the inner cavity of the type-IV hydrogen storage container liner 400. The above temperature sensor is installed in the temperature measuring hole 2b2.

[0071] Heating rods 10 are installed in both the first joint assembly 1b and the second joint assembly 2b. By controlling the energization of the heating rods 10, the first joint assembly 1b and the second joint assembly 2b are heated, and then the valve seat 40a is heated, so as to more accurately control the temperature in the area of the valve seat 40a, improve the connection strength and sealing performance between the valve seat 40a and the non-metallic housing, and the product qualification rate.

[0072] Embodiment 2: The structure and principle of this embodiment are basically the same as those of Embodiment 1. The same parts will not be described in detail. Only the different parts will be described. The difference is that a manually operable locking assembly 1d can be used for replacement. For example, the locking tongue 1d2 is slidably installed on the first bracket 1c through a guiding structure. The first joint assembly 1b has a locking mating surface 1b2 that cooperates with the locking tongue 1d2. The moving direction of the locking tongue 1d2 is perpendicular to the axial line direction of the first joint assembly 1b. The locking mating surface 1b2 and the locking tongue 1d2 are in a planar fit perpendicular to the axial line direction of the first joint assembly 1b.

Claims

1. A rotational molding device for a type IV hydrogen storage container liner, comprising a rotating frame (100) and a rotational molding mold (700), wherein the rotational molding mold (700) comprises a tube body molding section (70a), a first hemispherical molding section (70b) and a second hemispherical molding section (70c) respectively located at two ends of the main body molding section, and a rotatable The tube body forming section (70a) and the rotating frame (100) are connected by a disassembly fixed connection assembly (70d); the tube body forming section (70a) and the rotating frame (100) are rotatably connected via a plurality of supporting rotating members (500) sleeved outside the tube body forming section (70a), and the rotational molding mold (700) can rotate around the axis of the tube body forming section (70a); a motor (300) is installed on the rotating frame (100), and the main shaft of the motor (300) is connected to the tube body forming section (70a) via a transmission assembly (600); it is characterized in that: A handle (3) is mounted on both the first hemispherical molding section (70b) and the second hemispherical molding section (70c); The tube body forming section (70a) and the first hemispherical forming section (70b) are also connected via a first linear guide assembly (4) having a first guide rod and a first sliding member; when the first hemispherical forming section (70b) and the tube body forming section (70a) are in a separated state, the first hemispherical forming section (70b) can translate along the axis of the tube body forming section (70a); A second linear guide assembly (5) having a second guide rod (5a) and a second sliding member (5b) is mounted on the tube body forming section (70a); the second hemispherical forming section (70c) is rotatably connected to the second guide rod (5a) or the second sliding member (5b) via a rotating shaft (6); when the second hemispherical forming section (70c) and the tube body forming section (70a) are in a separated state, the second hemispherical forming section (70c) can both translate along the axis of the tube body forming section (70a) and swing around the rotating shaft (6).

2. The IV type hydrogen storage container liner rotational molding device according to claim 1, characterized in that: The axis centerline of the first guide rod in the first linear guide assembly (4) is arranged parallel to the axis centerline of the tube body forming section (70a), and the number of first linear guide assemblies (4) is multiple groups; the multiple groups of first linear guide assemblies (4) are arranged circumferentially around the tube body forming section (70a).

3. The IV type hydrogen storage container liner rotational molding device according to claim 1, characterized in that: The axis center line of the second guide rod (5a) in the second linear guide assembly (5) is arranged parallel to the axis center line of the tube body forming section (70a), the number of the second linear guide assemblies (5) is multiple, and the multiple groups of second linear guide assemblies (5) are arranged on the same plane on the same side of the tube body forming section (70a), and the second hemispherical forming body (2a) is connected to the second guide rod (5a) or the second sliding member (5b) in each group of second linear guide assemblies (5) through a rotating shaft (6).

4. The IV type hydrogen storage container liner rotational molding device according to claim 1, characterized in that: The second linear guide assembly (5) is provided with a rotation locking piece (7), and when the second hemispherical molding section (70c) and the tube molding section (70a) are in a facing state, the rotation locking piece (7) can put the second hemispherical molding body (2a) and the second guide rod (5a) or the second sliding piece (5b) on the second linear guide assembly (5) into a rotationally locked state.

5. The IV type hydrogen storage container liner rotational molding device according to claim 4, characterized in that: The rotating locking element (7) is an elastic latch pin inserted and installed on the second guide rod (5a); the second hemispherical molding section (70c) is provided with a socket matching the end of the elastic latch pin; when the end of the elastic latch pin is inserted into the socket, the rotating locking element (7) causes the second hemispherical molding section (70c) and the second guide rod (5a) to be in a rotating locking state; Or the rotating locking piece (7) is a wrench rotatably mounted on the second hemispherical molding section (70c), and the second guide rod (5a) has a limit surface matching the wrench, and when the wrench is rotated so as to contact the limit surface of the second guide rod (5a), the rotating locking piece (7) causes the second hemispherical molding section (70c) and the second guide rod (5a) to be in a rotationally locked state.

6. The rotational molding device for the inner liner of a type IV hydrogen storage container according to any one of claims 1 to 5, characterized in that: The first hemispherical molding section (70b) comprises a first hemispherical molding body (1a), the second hemispherical molding section (70c) comprises a second hemispherical molding body (2a), and a plurality of heating wires (70e) are arranged on the outer side surface of the tube molding section (70a), the outer side surfaces of the first hemispherical molding body (1a) and the second hemispherical molding body (2a), and the plurality of heating wires (70e) are arranged along the axis direction of the rotational molding mold (700); the IV type hydrogen storage container liner rotational molding device also comprises a control circuit, the control circuit is electrically connected to a temperature monitoring subcircuit for monitoring the cavity side wall temperature of the rotational molding mold (700) in sections, and the rotational molding mold (700) is divided into 8 to 15 temperature measurement areas along its axis direction; the plurality of heating wires (70e) are all electrically connected to the control circuit, and the control circuit can independently control whether the heating wires (70e) in the corresponding sections are energized according to the monitoring values ​​of the temperature monitoring subcircuit.

7. The rotational molding device for the inner liner of a type IV hydrogen storage container according to any one of claims 1 to 5, characterized in that: The first hemispherical molding section (70b) comprises a first hemispherical molding body (1a), and the second hemispherical molding section (70c) comprises a second hemispherical molding body (2a); a first annular groove (70g) is provided on the inner side surface of the first hemispherical molding body (1a) and the inner side surface of the second hemispherical molding body (2a); a plurality of first vacuum connection holes (70h) connected to the first annular groove (70g) are provided on the first hemispherical molding body (1a) and the second hemispherical molding body (2a); when the first hemispherical molding body (1a) and the second hemispherical molding body (2a) are When the valve seat (40a) of the IV type hydrogen storage container liner is pre-installed on the body (1a) and the second hemispherical molding body (2a), a sealing ring (8) is installed between the valve seat (40a) and the first hemispherical molding body (1a) and between the valve seat (40a) and the second hemispherical molding body (2a); the first annular groove (70g) is located on the area where the inner side surface of the first hemispherical molding body (1a) and the projection of the valve seat (40a) overlap, and is located on the area where the inner side surface of the second hemispherical molding body (2a) and the projection of the valve seat (40a) overlap.

8. The rotational molding device for the inner liner of a type IV hydrogen storage container according to claim 7, characterized in that: The first hemispherical molding body (1a), the second hemispherical molding body (2a) and the tube molding section (70a) are all provided with flange portions (70f); sealing rings (8) are also installed between the flange portion (70f) of the first hemispherical molding body (1a) and the flange portion (70f) of the tube molding section (70a), and between the flange portion (70f) of the second hemispherical molding body (2a) and the flange portion (70f) of the tube molding section (70a); second annular grooves (70j) are provided on the side surfaces of the flange portions (70f) at both ends of the tube molding section (70a); and a plurality of second vacuum connection holes (70k) connected to the second annular grooves (70j) are provided on the flange portion (70f) of the first hemispherical molding body (1a) and the flange portion (70f) of the second hemispherical molding body (2a).

9. The IV type hydrogen storage container liner rotational molding device according to claim 7, characterized in that: The first hemispherical molding section (70b) further comprises a first joint assembly (1b) capable of being threadedly connected to the valve seat (40a); an air inlet hole (1b1) capable of being connected to the inner cavity of the IV-type hydrogen storage container liner (400) is provided in the first joint assembly (1b); a heating rod (10) is installed in each of the first joint assemblies (1b); and the first joint assembly (1b) can be heated by controlling the heating rod (10) to be energized.

10. The IV type hydrogen storage container liner rotational molding device according to claim 7, characterized in that: The second hemispherical molding section (70c) further comprises a second joint component (2b) capable of being threadedly connected to the valve seat (40a); the second joint component (2b) is provided with an exhaust hole (2b1) capable of being communicated with the inner cavity of the IV type hydrogen storage container liner (400); a heating rod (10) is installed in the second joint component (2b); and the second joint component (2b) can be heated by controlling the heating rod (10) to be energized.

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