Rotational molding device for liner of IV-type hydrogen storage container

Abstract

The invention provides a rotational molding device for an inner container of an IV-type hydrogen storage container, and belongs to the technical field of rotational molding. The rotational molding device solves the problem that when an existing rotational molding device is used for machining an IV-type hydrogen storage container inner container, a rotational molding mold is inconvenient to open and close. According to the rotational molding device for the IV-type hydrogen storage container inner container, a pipe body forming section is rotationally connected with a rotating frame through a supporting rotating piece, a first hemispherical forming section is connected with the pipe body forming section through a first linear guide assembly, and a second linear guide assembly is installed on the pipe body forming section; and the second hemispherical forming section is rotationally connected with the second linear guide assembly through a rotating shaft. The first linear guide assembly provides effective supporting force for the first hemispherical forming section, and the second linear guide assembly provides effective supporting force for the second hemispherical forming section, so that an operator can easily move the first hemispherical forming section and the second hemispherical forming section without auxiliary lifting of a lifting appliance; and the mold opening and closing convenience of the rotational molding mold is obviously improved.

Description

Technical Field

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

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

[0003] Rotomolding, also known as rotational molding, rotational molding, rotational molding, etc., is a thermoplastic hollow molding method. The method is to first add the plastic raw material into the mold, and then the mold is continuously rotated along two vertical axes and heated. Under the action of gravity and heat energy, the plastic raw material in the mold is gradually and evenly coated, melted and adhered to the entire surface of the mold cavity, formed into the required shape, and then cooled and shaped into a product. At present, many people have tried to apply the rotomolding process to the production of type IV hydrogen storage container liners; such as a high-pressure hydrogen storage bottle plastic liner rotomolding molding device and molding method disclosed in Chinese patent documents (application number 202210695343.9), an electrically heated hydrogen bottle rotomolding mold (application number 202320271741.8), a hydrogen storage bottle rotomolding machine quick opening mechanism (application number 202321886737.9), and a type IV hydrogen storage bottle plastic liner rotomolding process (202310910938.6).

[0004] The existing rotational molding devices and products used for processing type IV hydrogen storage container liners still have some shortcomings. For example, when the product is taken out of the rotational molding mold of the rotational molding device and when it is re-molded, a hoist is required to assist in lifting the two end covers, and multiple people need to collaborate, resulting in low production efficiency and high production costs. For example, the connection strength and sealing pass rate between the valve seat and the non-metallic shell in the product are low. For this reason, people have proposed a variety of solutions, such as the rotational molding liner for type IV hydrogen storage bottles recorded in the Chinese patent document (202321259711.1). By adjusting the connection structure between the two, it has good sealing and ensures stable installation of the valve seat. Summary of the invention

[0005] The present invention proposes a rotational molding device for a type IV hydrogen storage container liner. The technical problem to be solved by the present invention is how to improve the convenience of opening and closing the rotational molding mold when processing the type IV hydrogen storage container liner 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 type IV hydrogen storage container liner rotational molding device comprises a rotating frame and a rotational molding mold, the rotational molding mold comprises a tube body molding section, a first hemispherical molding section and a second hemispherical molding section respectively located at two ends of the main body molding section, the first hemispherical molding section and the tube body molding section as well as the second hemispherical molding section and the tube body molding section are connected by a detachable fixed connection assembly; the tube body molding section and the rotating frame are rotationally connected by a plurality of supporting rotating members sleeved outside the tube body molding section, and the rotational molding mold can rotate around the axis of the tube body molding section; a motor is installed on the rotating frame, and the main shaft of the motor is connected to the tube body molding section by a transmission assembly; The first hemispherical molding section and the second hemispherical molding section are both equipped with handles; the tube body molding section and the first hemispherical molding section are also connected by a first linear guide assembly having a first guide rod and a first sliding member. When the first hemispherical molding section and the tube body molding section are in a split state, the first hemispherical molding section can translate along the axis of the tube body molding section; a second linear guide assembly having a second guide rod and a second sliding member is installed on the tube body molding section, and the second hemispherical molding section is rotatably connected to the second guide rod or the second sliding member via a rotating axis. When the second hemispherical molding section and the tube body molding section are in a split state, the second hemispherical molding section can both translate along the axis of the tube body molding section and swing around the rotating axis.

[0007] After the inner liner of the type IV hydrogen storage container is processed by the rotational molding device, the first hemisphere forming section and the second hemisphere forming section are opened in no particular order during demoulding, and then the product is pulled out along its axial direction.

[0008] The process of opening the first hemispherical molding section is to first operate the detachable fixed connection component to separate the first hemispherical molding section from the tube body molding section, and then hold the handle to apply a pulling force along the axis of the tube body molding section to the first hemispherical molding section, so that the first hemispherical molding section moves along the guide direction of the first linear guide component, thereby ensuring that the first hemispherical molding 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 molding section is the reverse operation of the process of opening the first hemispherical molding section, and will not be described here in detail.

[0009] The process of opening the second hemispherical molding section is to first operate the detachable fixed connection component to make the second hemispherical molding section and the tube body molding section in a separated state, and then hold the handle to apply a pulling force along the axis of the tube body molding section to the second hemispherical molding section, so that the second hemispherical molding section moves along the guide direction of the second linear guide component. In this process, the second hemispherical molding section is adaptively controlled to swing until the second hemispherical molding section does not block the port of the tube body molding section; thereby, not only ensuring that the product can be taken out of the port smoothly, but also providing a large enough space for installing the valve seat. The process of closing the second hemispherical molding section is the reverse operation of the process of opening the second hemispherical molding section, and will not be described here in detail.

[0010] In summary, the first linear guide assembly provides effective support for the first hemispherical molding segment, and the second linear guide assembly provides effective support for the second hemispherical molding segment, so that the operator can easily move the first hemispherical molding segment and the second hemispherical molding segment without the aid of lifting equipment, which significantly improves the convenience of opening and closing the rotational molding mold, shortens the production interval, improves production efficiency, and reduces the number of operators required.

[0011] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the axis line of the first guide rod in the first linear guide assembly is arranged parallel to the axis line of the tube body molding section, and the number of first linear guide assemblies is multiple groups; the multiple groups of first linear guide assemblies are arranged circumferentially around the tube body molding section.

[0012] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the axis line of the second guide rod in the second linear guide assembly is arranged parallel to the axis line of the tube body molding section, the number of the second linear guide assemblies is multiple groups, and the multiple groups of second linear guide assemblies are arranged on the same plane on the same side of the tube body molding section, and the second hemispherical molding body is connected to the second guide rod or the second sliding member in each group of second linear guide assemblies through a rotating shaft.

[0013] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the rotating locking piece can adopt any of the following schemes. The first scheme is that the rotating locking piece is an elastic pin inserted and installed on the second guide rod, and the second hemispherical molding section is provided with a socket matching the end of the elastic pin. When the end of the elastic pin is embedded in the socket, the rotating locking piece makes the second hemispherical molding section and the second guide rod in a rotational locking state; the second scheme is that the rotating locking piece is a wrench rotatably installed on the second hemispherical molding section, and the second guide rod has a limiting surface matching the wrench. When the wrench is rotated to contact the limiting surface of the second guide rod, the rotating locking piece makes the second hemispherical molding section and the second guide rod in a rotational locking state.

[0014] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the first hemispherical molding section includes a first hemispherical molding body, the second hemispherical molding section includes a second hemispherical molding body, and multiple heating wires are arranged on the outer side surface of the tube body molding section, the outer side surface of the first hemispherical molding body and the second hemispherical molding body, and the multiple heating wires are arranged along the axial direction of the rotational molding mold; the IV type hydrogen storage container liner rotational molding device also includes a control circuit, and the control circuit is electrically connected to a temperature monitoring subcircuit for segmented monitoring of the cavity side wall temperature of the rotational molding mold, and the rotational molding mold is divided into 8 to 15 temperature measurement areas along its axial direction; the multiple heating wires are all electrically connected to the control circuit, and the control circuit can independently control whether the heating wires in the corresponding segments are energized according to the monitoring values ​​of the temperature monitoring subcircuit.

[0015] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the first hemispherical molding section includes a first hemispherical molding body and a first joint assembly that can be threadedly connected to the valve seat, the middle part of the first hemispherical molding body has a first avoidance hole and a positioning surface matching the valve seat, the first joint assembly is inserted into the first avoidance hole, and a first bracket is fixed on the first hemispherical molding body. The outer end of the first joint assembly is connected to the first bracket through a locking assembly, and the locking assembly can make the first joint assembly in an axial locking state or an axial non-locking 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 axial locking state relative to the first bracket, the valve seat is in a fixed state.

[0016] During the cooling and molding process of the product, the locking assembly is manipulated to switch the state of the first joint assembly relative to the first bracket from an axially locked state to an axially unlocked state, thereby releasing the valve seat at one end of the product, significantly reducing the problem of decreased connection strength and sealing between the valve seat and the non-metallic shell due to material cooling shrinkage, thereby significantly improving the product qualification rate.

[0017] In the above-mentioned IV type hydrogen storage container liner rotational molding device, there is a first cooling cavity between the valve seat and the first hemispherical molding body, and a plurality of first vents connected to the first cooling cavity are provided on the first hemispherical molding body. During the cooling and molding process of the product, flowing air is injected into the first cooling cavity through the first vents, so that the valve seat area in the product is cooled and molded first before the other areas, which also significantly reduces the problem of decreased connection strength and sealing between the valve seat and the non-metallic shell due to material cooling shrinkage, thereby significantly improving the product qualification rate.

[0018] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the second hemispherical molding section includes a second hemispherical molding body; a first annular groove is provided on the inner side surface of the first hemispherical molding body and the inner side surface of the second hemispherical molding body, and a plurality of first vacuum connection holes connected to the first annular groove are provided on the first hemispherical molding body and the second hemispherical molding body; when the valve seat of the IV type hydrogen storage container liner is pre-installed on the first hemispherical molding body and the second hemispherical molding body, sealing rings are installed between the valve seat and the first hemispherical molding body and between the valve seat and the second hemispherical molding body; the first annular groove is located on the overlapping area of ​​the inner side surface of the first hemispherical molding body and the projection of the valve seat and on the overlapping area of ​​the inner side surface of the second hemispherical molding body and the projection of the valve seat.

[0019] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the first hemispherical molding body, the second hemispherical molding body and the tube body molding section all have flange parts, and sealing rings are also installed between the flange part of the first hemispherical molding body and the flange part of the tube body molding section, and between the flange part of the second hemispherical molding body and the flange part of the tube body molding section; second annular grooves are provided on the side surfaces of the flange parts at both ends of the tube body molding section, and multiple second vacuum connection holes connected to the second annular grooves are provided on the flange part of the first hemispherical molding body and the flange part of the second hemispherical molding body.

[0020] In the above-mentioned IV-type hydrogen storage container liner rotational molding device, the first hemispherical molding section also includes a first joint assembly that can be threadedly connected to the valve seat, and the first joint assembly is provided with an air inlet hole that can be connected to the inner cavity of the IV-type hydrogen storage container liner; a heating rod is installed in the first joint assembly, and the first joint assembly can be heated by controlling the heating rod to be energized.

[0021] In the above-mentioned IV type hydrogen storage container liner rotational molding device, the second hemispherical molding section also includes a second joint assembly that can be threadedly connected to the valve seat, and the second joint assembly is provided with an exhaust hole that can be connected to the inner cavity of the IV type hydrogen storage container liner; a heating rod is installed in the second joint assembly, and the second joint assembly can be heated by controlling the heating rod to be energized.

[0022] Compared with the prior art, the IV-type hydrogen storage container liner processed by the present rotational molding device has the advantages of convenient mold opening and closing, convenient product removal, and high processing efficiency. The IV-type hydrogen storage container liner processed by the present rotational molding device has the advantages of high connection strength and sealing between the valve seat and the non-metallic shell, and high product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a rotational molding device.

[0024] Figure 2 and Figure 3 It is a three-dimensional structural schematic diagram of the rotational molding mold in different viewing angles in the mold closing state.

[0025] Figure 4 yes Figure 3 A magnified view of the local structure.

[0026] Figure 5 and Figure 6 It is a three-dimensional structural schematic diagram of the rotational molding mold in different mold opening states.

[0027] Figure 7 It is a schematic diagram of the end face structure of the rotational molding mold.

[0028] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of AA.

[0029] Fig. 9 yes Figure 8 A partial enlarged view of point B in the middle.

[0030] Fig.10 yes Figure 8 A partial enlarged view of point C in the middle.

[0031] Fig.11 It is a schematic diagram of the three-dimensional structure of the first hemisphere forming segment.

[0032] Fig.12 It is a schematic diagram of the end surface structure of the first hemisphere forming segment.

[0033] Fig.13 yes Fig.12 Schematic diagram of the cross-sectional structure of DD.

[0034] Fig.14 yes Fig.13 A partial enlarged view of point F.

[0035] Fig.15 yes Fig.12 Schematic diagram of the cross-sectional structure of EE.

[0036] Fig.16 yes Fig.15 A partial enlarged view of point G.

[0037] Fig.17 It is a three-dimensional structural schematic diagram of the locking component in the first hemispherical molding section in an axially non-locked state.

[0038] Fig.18 It is a schematic diagram of the three-dimensional structure of the second hemisphere forming segment.

[0039] Fig.19It is a schematic diagram of the end surface structure of the second hemisphere forming segment.

[0040] Fig. 20 yes Fig.19 Schematic diagram of the cross-sectional structure of HH.

[0041] Fig.21 yes Fig. 20 A partial enlarged view of point J.

[0042] In the figure, 100, rotating frame; 200, rotating joint; 300, motor; 400, IV type hydrogen storage container liner; 40a, valve seat; 500, supporting rotating member; 600, transmission assembly; 700, rotational molding mold; 70a, tube body molding section; 70b, first hemispherical molding section; 70c, second hemispherical molding section; 70d, detachable fixed connection assembly; 70e, heating wire; 70f, flange portion; 70g, first annular groove; 70h, first vacuum connection hole; 70j, second annular groove; 70k, second vacuum connection hole; 1a, first hemispherical molding body; 1b, The first joint assembly; 1b1, air inlet; 1b2, locking mating surface; 1c, the first bracket; 1d, the locking assembly; 1d1, the cylinder; 1d2, the locking tongue; 1e, the first cooling chamber; 1f, the first ventilation hole; 2a, the second hemispherical molding body; 2b, the second joint assembly; 2b1, the exhaust hole; 2b2, the temperature measuring hole; 2c, the second cooling chamber; 2d, the second ventilation hole; 3, the handle; 4, the first linear guide assembly; 5, the second linear guide assembly; 5a, the second guide rod; 5b, the second sliding member; 6, the rotating shaft; 7, the rotating locking member; 8, the sealing ring; 9, the sealing plate; 10, the heating rod. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] 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 be a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0048] like Figure 1 As shown, a rotational molding device for a type IV hydrogen storage container liner 400 includes a rotating frame 100, a rotational molding mold 700, a rotating joint 200, a motor 300 and a control circuit.

[0049] When the rotational molding device is in use, the rotating frame 100 is fixedly mounted on the swing driving device. The IV type hydrogen storage container liner 400 includes a non-metallic shell and valve seats 40a located at both ends of the shell, and the valve seats 40a are pre-installed in the rotational molding mold 700. The rotational molding mold 700 is used to mold the shell of the IV type hydrogen storage container liner 400. The motor 300 is installed on the rotating frame 100, and the motor 300 is used to drive the rotational molding mold 700 to rotate. The motor 300 is electrically connected to the control circuit. The rotational molding mold 700 includes an air pipe and a wire. The rotary joint 200 is installed on the rotating frame 100. The air pipe and the wire are connected to the rotary joint 200. The rotary joint 200 prevents the rotational molding mold 700 from rotating continuously, causing the air pipe and the wire to be entangled and twisted.

[0050] like Figures 2 to 6 As shown, the rotational molding mold 700 includes a tube molding section 70a, a first hemispherical molding section 70b and a second hemispherical molding section 70c respectively located at both ends of the main body molding section; the tube molding section 70a is mainly used to mold the circular tube section of the shell, and the first hemispherical molding section 70b and the second hemispherical molding section 70c are mainly used to pre-install the valve seat 40a and mold the hemispherical sections at both ends of the shell.

[0051] The first hemispherical molding section 70b and the tube body molding section 70a, as well as the second hemispherical molding section 70c and the tube body molding section 70a, are connected via a detachable fixed connection assembly 70d. The attached drawings of the specification show that the detachable fixed connection assembly 70d is a bolt and nut assembly, which can be replaced by other structures according to actual conditions, such as an electromagnet adsorption connection assembly and a quick pull buckle connection assembly.

[0052] The tube forming section 70a is rotatably connected to the rotating frame 100 through a plurality of supporting rotating members 500 sleeved outside the tube forming section 70a. The supporting rotating member 500 is a bearing or a roller ring assembly; the drawings in the specification show that one end of the tube forming section 70a is connected to the rotating frame 100 through a bearing, and the other end is connected to the rotating frame 100 through a roller ring assembly; the rotational molding mold 700 can not only stably rotate around the axis of the tube forming section 70a, but also has the advantages of low manufacturing cost and convenient mold disassembly and assembly.

[0053] The main shaft of the motor 300 is connected to the tube forming section 70a via a transmission assembly 600; the transmission assembly 600 is shown as a gear assembly in the drawings of the specification, and the gear assembly may also be replaced by other structures, such as a chain sprocket assembly, according to actual conditions.

[0054] The first hemispherical molding segment 70b includes a first hemispherical molding body 1a, and the second hemispherical molding segment 70c includes a second hemispherical molding body 2a. Both the first hemispherical molding body 1a and the second hemispherical molding body 2a are provided with handles 3. The handles 3 are provided to facilitate operators to move the first hemispherical molding segment 70b and the second hemispherical molding segment 70c.

[0055] The tube forming section 70a is connected to the first hemispherical forming body 1a of the first hemispherical forming section 70b through a first linear guide assembly 4 having a first guide rod and a first sliding member. The axis of the first guide rod is arranged parallel to the axis of the tube forming section 70a, so that the first hemispherical forming section 70b translates along the axis of the tube forming section 70a when it moves. The figures of the specification show that the number of the first guide rods and the first sliding member are both multiple, and the multiple first guide rods are arranged circumferentially around the tube forming section 70a. The first guide rod is fixedly connected to the first hemispherical forming 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 body 1a can be completely separated from the cooled and formed IV type hydrogen storage container liner 400.

[0056] The second linear guide assembly 5 having a second guide rod 5a and a second slide 5b is installed on the tube forming section 70a, and the second hemispherical forming body 2a of the second hemispherical forming section 70c is rotatably connected with the second guide rod 5a or the second slide 5b via a rotating shaft 6. The axis of the second guide rod 5a is arranged parallel to the axis of the tube forming section 70a, so that the second hemispherical forming section 70c moves along the axis of the tube forming section 70a. The drawings in the specification show that the number of the second guide rod 5a and the second slide 5b is multiple, and the multiple second guide rods 5a are arranged on the same side of the tube forming section 70a, the second hemispherical forming body 2a is connected with the second guide rod 5a via a rotating shaft 6, and the second slide 5b is installed on the tube forming section 70a. By moving the second hemispherical molding section 70c, the second hemispherical molding body 2a can be completely separated from the cooled and formed IV type hydrogen storage container liner 400, and by swinging the second hemispherical molding section 70c, the second hemispherical molding section 70c can be located on the port side of the tube body molding section 70a, which significantly reduces the influence of the second hemispherical molding section 70c on the demolding operation of the cooled and formed IV type hydrogen storage container liner 400.

[0057] The first sliding member and the second sliding member 5b have the same function, and the two use the same components or different components; the first sliding member and the second sliding member 5b are sliding sleeves mounted on the guide rod or rollers located on the outer periphery of the guide rod. The drawings in the specification show that the first sliding member is a sliding sleeve fixedly connected to the tube body forming section 70a, and the second sliding member 5b is a roller rotatably connected to the tube body forming section 70a.

[0058] like Figure 4As shown, a rotation locking piece 7 is installed on the second linear guide component 5. When the second hemispherical molding section 70c and the tube body molding section 70a are in a facing state, the rotation locking piece 7 can make the second hemispherical molding body 2a and the second guide rod 5a or the second sliding piece 5b on the second linear guide component 5 be in a rotation locking state, so that the second hemispherical molding section 70c can move along the second linear guide component 5 and swing around the rotating axis 6 in steps, thereby improving the force application efficiency, especially when demolding, it is more conducive to the separation of the second hemispherical molding section 70c and the IV type hydrogen storage container liner 400. The attached figure of the specification shows that the rotating locking piece 7 is an elastic pin inserted and installed on the second guide rod 5a, and a socket matching the end of the elastic pin is provided on the second hemispherical molding body 2a. When the end of the elastic pin is embedded in the socket, the rotating locking piece 7 puts the second hemispherical molding body 2a and the second guide rod 5a in a rotational locking state; according to actual conditions, the elastic pin can also be replaced by other components, such as a wrench rotatably installed on the second hemispherical molding body 2a, and the second guide rod 5a has a limiting surface matching the wrench. When the wrench is rotated to contact the limiting surface of the second guide rod 5a, the rotating locking piece 7 puts the second hemispherical molding body 2a and the second guide rod 5a in a rotational locking state.

[0059] like Figures 2 to 6 As shown, multiple heating wires 70e are arranged on the outer side surface of the tube body forming section 70a, the outer side surface of the first hemispherical forming body 1a and the second hemispherical forming body 2a, and the heating wires 70e are electrically connected to the wires. When the heating wires 70e are powered on, they are used to heat the tube body forming section 70a, the first hemispherical forming body 1a and the second hemispherical forming body 2a. The multiple heating wires 70e are all electrically connected to the control circuit, and the control circuit is equipped with a temperature monitoring subcircuit for monitoring the temperature of the side wall of the mold cavity of the rotational molding mold 700 in sections, and the number of sections is any value from 3 to 8; the control circuit can independently control the heating wires 70e in the corresponding sections according to the monitoring value of the temperature monitoring subcircuit.

[0060] like Figures 8 to 10As shown, the first hemispherical molding body 1a and the second hemispherical molding body 2a are pre-installed with a valve seat 40a, and 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 hemispherical molding body 1a, the second hemispherical molding body 2a and the tube molding section 70a all have a flange portion 70f, and a sealing ring 8 is 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. A first annular groove 70g is provided on the inner side surface of the first hemispherical molding body 1a and the overlapped area of ​​the projection of the valve seat 40a, and a first annular groove 70g is provided on the inner side surface of the second hemispherical molding body 2a and the overlapped area of ​​the projection of the valve seat 40a. 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. A second annular groove 70j is provided on the side surface of the flange portion 70f at both ends of the tube body molding section 70a, and a plurality of second vacuum connection holes 70k connected to the second annular groove 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. The sealing performance of the inner cavity of the rotational molding mold 700 is significantly improved by the sealing ring 8, and vacuuming is performed through the plurality of first vacuum connection holes 70h and the second vacuum connection holes 70k, which can significantly shorten the time required for vacuuming, thereby improving production efficiency.

[0061] like Figures 11 to 17 As shown, the first hemispherical molding section 70b also includes a first joint component 1b that can be threadedly connected to the valve seat 40a and a first bracket 1c fixedly connected to the outer side of the first hemispherical molding body 1a; the first joint component 1b is in the shape of a bolt, and an air inlet hole 1b1 connected to the inner cavity of the rotational molding mold 700 is opened in the first joint component 1b, and the air inlet hole 1b1 is connected to the above-mentioned air pipe, and then 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 molding body 1a has a first avoidance hole and a positioning surface matching the valve seat 40a, and the first joint component 1b is inserted in the first avoidance hole. The outer end of the first joint assembly 1b is connected to the first bracket 1c through the locking assembly 1d. The locking assembly 1d can make the first joint assembly 1b be in an axial locking state or an axial unlocking 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 be in an axial locking state relative to the first bracket 1c, the valve seat 40a is in a fixed state.

[0062] The locking assembly 1d includes a cylinder 1d1 and a locking tongue 1d2 fixed on the piston rod of the cylinder 1d1. The cylinder body of the cylinder 1d1 is fixedly mounted on the first bracket 1c. The first joint assembly 1b has a locking mating surface 1b2 that matches the locking tongue 1d2. The accompanying drawings of the specification show that the movement 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 an 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 toward the inner cavity of the rotational molding mold 700. The valve seat 40a contacts the positioning surface and the first joint assembly 1b is connected to the valve seat 40a, which restricts the first joint assembly 1b from moving toward the outer side of the rotational molding mold 700, so that the first joint assembly 1b is in an axial locking 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 is separated from the first joint component 1b, and the first joint component 1b can move toward the inner cavity of the rotational molding mold 700. It is objective that there is shrinkage during the cooling and molding process of the product. This structure and processing technology significantly reduce the transitional stretching between the valve seat 40a and the non-metallic shell, thereby significantly improving the connection strength and sealing between the valve seat 40a and the non-metallic shell, thereby improving the product qualification rate.

[0063] The contact surfaces of the locking mating surface 1b2 and the locking tongue 1d2 that can contact the locking mating surface 1b2 are both inclined surfaces inclined relative to the axial direction of the first joint component 1b, that is, the locking tongue 1d2 and the first joint component 1b are inclined surfaces. This structure can improve the fixing firmness of the valve seat 40a when the first joint component 1b is in an axial locking state relative to the first bracket 1c.

[0064] The drawings in the specification show that there are two sets of locking components 1d, and the number of locking components 1d can be adaptively increased or decreased according to actual conditions. The two sets of locking components 1d are symmetrically arranged, which can not only improve the force stability of the first joint component 1b, but also the consistency of the position of the first joint component 1b, thereby improving the fixing firmness of the valve seat 40a.

[0065] The rotational molding mold 700 also includes a temperature sensor for monitoring the air temperature in the inner cavity of the IV type hydrogen storage container liner 400. A solenoid valve is connected to the air supply pipeline of the cylinder 1d1. The solenoid valve and the temperature sensor are both electrically connected to the control circuit. When the air temperature in the inner cavity of the IV type hydrogen storage container liner 400 drops to a set threshold, the control circuit controls the solenoid valve to retract the piston rod of the cylinder 1d1. The set threshold is any value between 120°C and 140°C. This structure realizes automatic switching of the state of the first joint assembly 1b relative to the first bracket 1c, which not only improves production efficiency, but also improves product quality consistency.

[0066] According to actual conditions, the movement direction of the piston rod of the cylinder 1d1 can be adjusted from the above-mentioned perpendicular setting to the axial direction of the first joint component 1b to the setting parallel to the axial direction of the first joint component 1b, so that when the piston rod of the cylinder 1d1 is in an extended state, the locking tongue 1d2 contacts the locking mating surface 1b2 on the first joint component 1b, that is, the locking tongue 1d2 limits the first joint component 1b from moving toward the inner cavity of the rotational molding mold 700; when the piston rod of the cylinder 1d1 switches from an extended state to a retracted state, the locking tongue 1d2 separates from the first joint component 1b and a larger distance is formed between the two, ensuring that the first joint component 1b can move toward the inner cavity of the rotational molding mold 700.

[0067] like Figures 13 to 16 As shown, the valve seat 40a is in a fixed state, and there is a first cooling cavity 1e between the outer side of the valve seat 40a and the inner side of the first hemispherical molding body 1a, and a plurality of first vents 1f connected to the first cooling cavity 1e are provided on the first hemispherical molding body 1a. During the cooling and molding process of the product, flowing air is injected into the first cooling cavity 1e through the first vents 1f, so that the valve seat 40a area in the product is cooled and molded first before the other areas. A sealing plate 9 is sleeved on the first joint assembly 1b, and the sealing plate 9 is sealed and fixedly connected to the middle outer end surface of the first hemispherical molding body 1a, and the sealing plate 9 is sealed and connected to the first joint assembly 1b. The sealing ring 8 between the sealing plate 9 and the valve seat 40a and the first hemispherical molding body 1a is sealed, which significantly improves the sealing of the first cooling cavity 1e, reduces heat loss during the heating stage, and then more accurately controls the temperature of the valve seat 40a area, improves the connection strength and sealing between the valve seat 40a and the non-metallic shell, and improves the product qualification rate.

[0068] like Figures 17 to 21 As shown, the second hemispherical molding section 70c also 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. The second joint assembly 2b can fix the valve seat 40a on the second hemispherical molding body 2a. A second cooling cavity 2c is provided between the outer side surface of the valve seat 40a and the inner side surface of the second hemispherical molding body 2a, and a plurality of second vents 2d connected to the second cooling cavity 2c are provided on the second hemispherical molding body 2a; the functions of the second cooling cavity 2c and the second vents 2d are the same as those of the first cooling cavity 1e and the first vents 1f. A sealing plate 9 is also sleeved on the second joint assembly 2b, and the sealing plate 9 is sealed and fixedly connected to the middle outer end surface of the second hemispherical molding body 2a. The sealing plate 9 is sealed and connected to the second joint assembly 2b. The sealing of the sealing plate 9 and the sealing ring 8 between the valve seat 40a and the second hemispherical molding body 2a significantly improves the sealing performance of the second cooling cavity 2c.

[0069] The second joint assembly 2b is provided with an exhaust hole 2b1 and a temperature measuring hole 2b2, both of which can be connected to the inner cavity of the IV type hydrogen storage container liner 400. The temperature sensor is installed in the temperature measuring hole 2b2.

[0070] A heating rod 10 is installed in both the first joint component 1b and the second joint component 2b. The heating rod 10 is powered on to heat the first joint component 1b and the second joint component 2b, thereby heating the valve seat 40a. This enables the temperature of the valve seat 40a area to be more accurately controlled, thereby improving the connection strength and sealing between the valve seat 40a and the non-metallic shell, as well as the product qualification rate.

[0071] Embodiment 2: The structure and principle of this embodiment are basically the same as those of Embodiment 1. The basic similarities are not described in detail. Only the differences are described. The differences are that a manually operated locking assembly 1d can be used as a replacement, such as a locking tongue 1d2 that is slidably installed on the first bracket 1c through a guide structure, and the first joint assembly 1b has a locking mating surface 1b2 that cooperates with the locking tongue 1d2. The movement direction of the locking tongue 1d2 is perpendicular to the axis direction of the first joint assembly 1b. The locking mating surface 1b2 and the locking tongue 1d2 are plane mating perpendicular to the axis 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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