A plastic liner high-pressure hydrogen storage container bottle mouth sealing device and a sealing method thereof

Abstract

The application provides a plastic liner high-pressure hydrogen storage container bottle mouth sealing device and a sealing method thereof, and relates to the technical field of plastic liner hydrogen storage containers. The device comprises a hydrogen storage bottle positioning mechanism, a liner assembly, a linear driving mechanism and a rotary driving mechanism. The liner assembly comprises a plastic liner and two metal bottle valve seats. The hydrogen storage bottle positioning mechanism comprises a rack support, a first positioning carrier and a second positioning carrier. The linear driving mechanism comprises a linear driving part and an inner expansion pull rod. The linear driving part comprises a linear fixed part and a linear driving part. The right end of the inner expansion pull rod is detachably connected with the linear driving part, the left end of the inner expansion pull rod extends into the plastic liner, and the inner expansion pull rod is rotatably sleeved with a rotary sleeve. An inner expansion sleeve is installed on the rotary sleeve. The right end of the inner expansion sleeve passes through a baffle and is located in the metal bottle valve seat. The rotary driving mechanism is used for driving the rotary sleeve to rotate. The application has the advantages of realizing semi-automatic operation, improving sealing efficiency, effectively guaranteeing the consistency and accuracy of sealing.

Description

Technical Field

[0001] This invention relates to the field of plastic-lined hydrogen storage container technology, and more specifically, to a sealing device and sealing method for a plastic-lined high-pressure hydrogen storage container bottle mouth. Background Technology

[0002] High-pressure gaseous hydrogen storage refers to compressing hydrogen in its gaseous state and storing it in a high-pressure container. It is one of the most widely used hydrogen storage technologies in the current hydrogen fuel cell vehicle field. To meet the lightweight requirements of hydrogen fuel cell vehicles, fiber-wound plastic-lined high-pressure hydrogen storage containers have emerged. These containers generally consist of three parts: a plastic inner liner, a metal valve seat, and a fiber composite layer. Figure 1 and Figure 2 As shown, the inner liner assembly 02 includes a plastic inner liner 0201 and two metal bottle valve seats 0202; the two metal bottle valve seats 0202 are respectively fixedly connected to the bottle openings at both ends of the plastic inner liner 0201; the plastic inner liner is generally made of materials such as polyethylene (including modified polyethylene) or polyamide (including modified polyamide); the metal bottle valve seats can be connected to high-pressure combination valves or other external parts, and are generally made of metal materials such as aluminum alloy or stainless steel; the fiber composite layer is the main load-bearing layer of the high-pressure hydrogen storage container, and is generally made of high-strength carbon fiber composite material wound together.

[0003] The bottle mouth sealing technology of fiber-wound plastic-lined high-pressure hydrogen storage containers is a key aspect of their development. Patent CN218119382U proposes a bottle mouth sealing structure that uses a metal inner ring and a plastic inner liner to achieve a seal through strong compression. However, the implementation and installation process of this sealing structure is inefficient, and the structural precision is difficult to guarantee, resulting in reduced reliability. Furthermore, the production process of fiber-wound plastic-lined high-pressure hydrogen storage containers has already achieved automation and intelligence; the manufacturing of its sealing structure also requires automation and intelligence. Therefore, a more reliable and efficient manufacturing method is urgently needed to address the sealing structure described in this patent. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing sealing structure of the inner liner high-pressure hydrogen storage container has low installation efficiency and low reliability after installation. In order to overcome the above-mentioned defects of the prior art, the present invention provides a semi-automatic operation, reduces the amount of manual operation, improves sealing efficiency, and effectively ensures the consistency and accuracy of the inner expansion sealing structure of the plastic inner liner high-pressure hydrogen storage container.

[0005] To achieve the objectives of this invention, the following technical solutions are adopted:

[0006] A sealing device for a high-pressure hydrogen storage container with a plastic liner includes a hydrogen storage bottle positioning mechanism, a linear drive mechanism, and a rotary drive mechanism. The hydrogen storage bottle positioning mechanism includes a frame support, a first positioning carrier, and a second positioning carrier. The first and second positioning carriers are respectively fixedly connected to the left and right sides of the frame support. The first positioning carrier has a first positioning part, and the second positioning carrier has a second positioning part, which cooperate to position the metal bottle valve seats on the left and right sides. A limiting part is provided on the frame support to the right of the second positioning mold to restrict the movement of the plastic liner during internal expansion sealing. The linear drive mechanism includes a linear drive component and an internal expansion pull rod. The linear drive component includes a linear fixing... The machine comprises a linear drive unit and a linear fixing unit; the linear fixing unit is mounted on the frame support, and the linear drive unit is movably connected to the linear fixing unit from left to right. The right end of the inner expansion rod is detachably connected to the linear drive unit, and the left end of the inner expansion rod passes through the right side metal bottle valve seat and extends into the plastic inner liner. An inner expansion extrusion surface is provided on the outer peripheral wall of the left end of the inner expansion rod. A rotating sleeve is rotatably sleeved on the inner expansion rod. An inner expansion sleeve is connected to the left side of the rotating sleeve. The inner expansion sleeve is sleeved on the inner expansion rod and extends into the metal bottle valve seat. The rotary drive mechanism is driven by the rotating sleeve and is used to drive the rotating sleeve to rotate. During connection, the inner expansion sleeve is threadedly connected to the metal bottle valve seat. The device facilitates the support, positioning, and limiting of the inner liner assembly through a first positioning part on a first positioning carrier and a second positioning part on a second positioning carrier. An internal expansion rod extends into the inner liner assembly and connects to a linear drive mechanism, facilitating subsequent internal expansion operations. A rotary drive mechanism allows the internal expansion sleeve to be screwed onto the metal bottle valve seat, thereby enabling the internal expansion rod to tightly seal the internal expansion sleeve onto the plastic inner liner. This achieves semi-automatic operation, reduces manual operation, improves sealing efficiency, and effectively ensures the consistency and accuracy of the internal expansion sealing structure of the high-pressure hydrogen storage container with a plastic inner liner.

[0007] Preferably, the first positioning part is an upward-opening arc-shaped concave surface; the second positioning part is an upward-opening positioning concave surface, with an arc-shaped segment in the middle and vertical segments on both sides; the metal bottle valve seat has valve seat limiting planes on both sides that match the vertical segments. This structure facilitates the metal bottle valve seat's engagement with the arc-shaped concave surface and the positioning concave surface, providing support and positioning. Simultaneously, the engagement of the arc-shaped segment and the vertical segment with the valve seat limiting planes prevents axial rotation of the metal bottle valve seat.

[0008] Preferably, the frame support includes a first support frame, a second support frame, multiple optical axes, a motor fixing plate, and a hydraulic cylinder fixing plate. The multiple optical axes are arranged horizontally between the first and second support frames, and are all parallel to each other. The first and second positioning carriers are respectively sleeved on the optical axes, and both are clamped and fixed to the optical axes by multiple optical axis fixing rings. The limiting part is a baffle, which is sleeved and fixed to the optical axes. The motor fixing plate is sleeved and fixed to the optical axes and located on the right side of the baffle, and is used to support the rotary drive mechanism. The hydraulic cylinder fixing plate is fixed to the optical axes and located on the right side of the baffle, and is used to support the linear drive mechanism. The optical axes in the above structure facilitate the movement and positioning of the first and second positioning carriers, and the clamping and fixing of the positioning carriers by the optical axis fixing rings secures and locks the first and second positioning carriers, providing support while also facilitating adjustment and positioning, and also facilitating the installation of the rotary drive mechanism and the linear drive mechanism.

[0009] Preferably, the right end of the internal expansion rod is detachably connected to the linear drive unit via a push rod coupling. Both ends of the push rod coupling are threaded, with one end threaded to the linear drive unit and the other end threaded to the right end of the internal expansion rod. This push rod coupling allows for a detachable connection while ensuring stability and robustness.

[0010] Preferably, the internal expansion compression surface on the internal expansion rod includes a horizontal straight section and a conical diameter-reducing section whose diameter gradually decreases from left to right. When the internal expansion rod moves along the axis of the plastic inner liner under the action of the linear drive unit, the internal expansion rod achieves internal expansion of the internal expansion sleeve through the conical diameter-reducing section, causing the outer surface of the internal expansion sleeve to press against the plastic inner liner and form a sealing surface. The conical diameter-reducing section facilitates internal expansion, and the horizontal straight section ensures that the internal expansion sleeve is tightly pressed against the inner wall of the plastic inner liner, ensuring a stable and sealed fit between the two.

[0011] Preferably, the linear drive mechanism further includes a hydraulic station motor, a pressure gauge, a hydraulic oil tank, and hydraulic oil pipes; the linear drive component is a hydraulic cylinder, the linear fixing part is the cylinder barrel, and the linear drive part is the cylinder push rod; the hydraulic station motor is mounted on the hydraulic oil tank and connected to the linear drive component, and the hydraulic station motor is used to drive the cylinder push rod to extend or retract; the hydraulic oil pipes are connected to the hydraulic oil tank and are used for hydraulic oil transportation; the pressure gauge is connected to the hydraulic oil pipes and is used to display the hydraulic cylinder pipeline pressure value. The hydraulic cylinder facilitates linear movement, and the hydraulic station motor, pressure gauge, hydraulic oil tank, and hydraulic oil pipes facilitate oil circuit detection and control.

[0012] Preferably, the rotary drive mechanism includes a servo motor, a motor coupling, a dynamic torque sensor, a drive gear, and a sleeve bearing. The servo motor is coaxially connected to the dynamic torque sensor via the motor coupling. The drive gear is coaxially connected to the dynamic torque sensor and meshes with the outer peripheral wall of the rotating sleeve. The rotating sleeve is sleeved on the inner expansion rod via the sleeve bearing. The servo motor drives the dynamic torque sensor to rotate, and the drive gear on the dynamic torque sensor drives the rotating sleeve to rotate synchronously, enabling the rotating sleeve to drive the inner expansion sleeve to rotate synchronously, thus connecting the inner expansion sleeve to the metal bottle valve seat via a thread.

[0013] Preferably, the left end of the rotating sleeve is provided with a mounting hole, and the inner surface of the mounting hole is provided with two parallel sleeve hole limiting planes; the inner expansion sleeve is provided with a positioning plane that mates with the sleeve hole limiting planes, enabling the inner expansion sleeve and the rotating sleeve to rotate synchronously; the outer peripheral wall of the right end of the inner expansion sleeve is provided with a connecting external thread, and the inner peripheral wall of the metal bottle valve seat is provided with a connecting internal thread that is threadedly connected to the connecting external thread; the outer peripheral wall of the left end of the inner expansion sleeve is provided with at least one annular protrusion, which, after internal expansion, seals with the inner peripheral wall of the plastic liner. The sleeve hole limiting planes and positioning planes facilitate the fixed connection and synchronous rotation of the rotating sleeve and the inner expansion sleeve. The mating of the connecting external thread and the connecting internal thread facilitates the threaded connection of the inner expansion sleeve to the metal bottle valve seat for fixation, thereby facilitating subsequent internal expansion operations of the internal expansion rod and improving internal expansion efficiency.

[0014] Preferably, a centralized control mechanism is also included, comprising a PLC controller, a touch screen display, and an emergency stop switch. The PLC controller receives signals from the linear drive mechanism and the rotary drive mechanism and sends control commands. The touch screen display and the emergency stop switch are respectively mounted on the PLC controller. The touch screen display is used to display and control the linear drive mechanism and the rotary drive mechanism, and to set equipment operating parameters. The emergency stop switch immediately stops the equipment and cuts off power in an emergency. The centralized control mechanism facilitates the control of the linear drive mechanism and the rotary drive mechanism, thereby enabling internal expansion operations, achieving semi-automation, significantly saving manpower, and improving efficiency.

[0015] A sealing device and method for the mouth of a high-pressure hydrogen storage container with a plastic liner, comprising the following steps:

[0016] S1. Install the internal expansion rod: Push the linear drive component in the linear drive mechanism to the designated position through the touch screen of the centralized control mechanism, and connect the right end of the internal expansion rod to the linear drive unit.

[0017] S2. Fix the inner expansion sleeve: Install the inner expansion sleeve inside the rotating sleeve;

[0018] S3. Place the plastic inner liner: Place the inner liner assembly on the first positioning carrier and the second positioning carrier, and limit and fix the metal bottle valve seats on both sides through the first positioning part and the second positioning part.

[0019] S4. Install the inner expansion sleeve: Start the switch through the touch screen of the centralized control mechanism. The rotary drive mechanism starts working under the control of PLC. The inner expansion sleeve and the rotating sleeve start to rotate under the drive of the rotary drive mechanism. Gently push the metal bottle valve seat along the axial direction of the inner liner assembly. Under the drive of the rotary drive mechanism, the inner expansion sleeve gradually screws into the metal bottle valve seat. When the thread is screwed to the end, the torque value gradually increases and the data is transmitted to the PLC controller in real time. When the real-time torque value reaches the set value, the PLC controller stops the rotary drive mechanism and completes the installation of the inner expansion sleeve.

[0020] S5. Inner expansion sleeve expands: After step S4 is completed, the PLC controller stops the rotation drive mechanism and starts the linear drive mechanism. The linear drive part in the linear drive mechanism retracts and drives the inner expansion rod to move axially along the inner liner assembly. The inner expansion sleeve expands through the inner expansion rod. The inner expansion sleeve undergoes plastic permanent deformation and presses the plastic inner liner to form a sealing surface.

[0021] S6. Complete: Remove the inner liner assembly along the push-out direction of the linear drive section.

[0022] In summary, the advantages of this invention are that the device has a high degree of automation, requiring only minimal manual operation during operation, thus improving the efficiency of the internal expansion and sealing of the high-pressure hydrogen storage container with a plastic liner; both the linear drive mechanism and the rotary drive mechanism are controlled by a PLC controller, effectively ensuring the consistency and accuracy of the internal expansion and sealing structure of the high-pressure hydrogen storage container with a plastic liner; and the rapid positioning structure enables the axial positioning and rotational limit of the liner component, facilitating quick and high-precision coaxial alignment between the liner component and the linear drive unit, greatly improving the overall internal expansion efficiency and quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the inner liner assembly before internal expansion in this invention;

[0024] Figure 2 This is a schematic diagram of the structure of the inner liner assembly after internal expansion in this invention.

[0025] Figure 3 This is a schematic diagram of the inner liner assembly in this invention;

[0026] Figure 4This is a schematic diagram of the internal expansion sleeve in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the plastic-lined high-pressure hydrogen storage container bottle mouth sealing device (including the inner liner assembly) of the present invention;

[0028] Figure 6 This is a schematic diagram of the rotary drive mechanism in this invention;

[0029] Figure 7 This is a schematic diagram of the structure of the first positioning vehicle in this invention;

[0030] Figure 8 This is a schematic diagram of the structure of the second positioning vehicle in this invention;

[0031] Figure 9 This is a schematic diagram of the rotating sleeve in this invention;

[0032] Figure 10 This is a schematic diagram of the sealing device for the high-pressure hydrogen storage container with a plastic liner (excluding the liner assembly) according to the present invention; Explanation of reference numerals:

[0033] 01. Hydrogen storage cylinder positioning mechanism; 0101. First positioning carrier; 010101. Arc-shaped concave surface; 0102. Frame support; 0103. Optical axis fixing ring; 0104. Optical axis; 0105. Second positioning carrier; 010501. Vertical section; 010502. Arc-shaped section; 0106. Baffle; 0107. Motor fixing plate; 0108. Hydraulic cylinder fixing plate; 02. Inner liner assembly; 0201. Plastic inner liner; 0202. Metal cylinder valve seat; 020201. Valve seat limiting plane; 020202. Connecting internal thread; 03. Centralized control mechanism; 0301. PLC controller; 0302. Touch screen display; 0303. Emergency stop switch; 04. Linear drive mechanism; 401. Hydraulic station motor; 0402. Pressure gauge; 0403. Hydraulic oil tank; 0404. Hydraulic oil pipe; 0405. Linear fixing part; 0406. Linear drive part; 0407. Push rod coupling; 0408. Internal expansion tie rod; 05. Rotary drive mechanism; 0501. Servo motor; 0502. Motor coupling; 0503. Dynamic torque sensor; 0504. Drive gear; 0505. Rotating sleeve; 050501. Sleeve hole limiting plane; 050502. Outer surface of rotating sleeve; 050503. External gear of rotating sleeve; 0506. Sleeve bearing; 06. Internal expansion sleeve; 0601. Annular protrusion; 0602. Connecting external thread; 0603. Positioning plane. Detailed Implementation

[0034] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0035] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0036] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 10As shown, a sealing device for a high-pressure hydrogen storage container with a plastic liner includes a hydrogen storage bottle positioning mechanism 01, an inner liner assembly 02, a linear drive mechanism 04, and a rotary drive mechanism 05. The inner liner assembly 02 includes a plastic inner liner 0201 and two metal bottle valve seats 0202. The two metal bottle valve seats 0202 are respectively fixedly connected to the bottle openings at both ends of the plastic inner liner 0201. The hydrogen storage bottle positioning mechanism 01 includes a frame support 0102, a first positioning carrier 0101, and a second positioning carrier 0105. The first positioning carrier 0101 and the second positioning carrier 0105 are respectively fixedly connected to the frame. The support 0102 has a first positioning part on the left and right sides; the first positioning carrier 0101 has a first positioning part, and the second positioning carrier 0105 has a second positioning part. The first positioning part and the second positioning part cooperate to position and limit the support of the metal bottle valve seats 0202 on the left and right sides, and to position the axis and limit the circumferential rotation of the inner liner assembly 02; the frame support 0102 has a limiting part located on the right side of the second positioning mold 0105 to limit the movement of the plastic inner liner 0201 during internal expansion sealing. The limiting part is a baffle 0106; the linear drive mechanism 04 includes a linear drive component and an internal expansion rod. 0408; The linear drive unit includes a linear fixing part 0405 and a linear drive part 0406; the linear fixing part 0405 is mounted on the frame support 0102, and the linear drive part 0406 is movably connected to the linear fixing part 0405. The right end of the inner expansion rod 0408 is detachably connected to the linear drive part 0406. The left end of the inner expansion rod 0408 passes through the baffle 0106 and the right side metal bottle valve seat 0202, and is inserted into the plastic inner liner 0201. The outer peripheral wall of the left end of the inner expansion rod 0408 is provided with an inner expansion extrusion surface for extruding the inner expansion sleeve 06. The right end of the internal expansion rod 0408 is rotatably sleeved with a rotating sleeve 0505; the rotating sleeve 0505 is connected to an internal expansion sleeve 06; the right end of the internal expansion sleeve 06 passes through the baffle 0106 and extends into the metal bottle valve seat 0202, and the internal expansion sleeve 06 is sleeved on the internal expansion rod 0408; the rotary drive mechanism 05 is connected to the rotating sleeve 0505, and the rotary drive mechanism 05 is used to drive the rotating sleeve 0505 to rotate, and during connection, the rotating sleeve 0505 drives the internal expansion sleeve 06 to rotate synchronously, so that the internal expansion sleeve 06 is threadedly connected to the metal bottle valve seat 0202.The device facilitates the support, positioning, and limiting of the inner liner assembly 02 through the first positioning part on the first positioning carrier 0101 and the second positioning part on the second positioning carrier 0105. The inner expansion rod 0408 extends into the inner liner assembly 02 and is connected to the linear drive mechanism 04, which facilitates subsequent inner expansion operations. The rotation drive mechanism 05 facilitates the screwing of the inner expansion sleeve 06 onto the metal bottle valve seat 0202, thereby enabling the inner expansion rod 0408 to tighten and seal the inner expansion sleeve 06 onto the plastic inner liner 0201. This achieves semi-automatic operation, reduces manual operation, improves sealing efficiency, and effectively ensures the consistency and accuracy of the inner expansion sealing structure of the high-pressure hydrogen storage container bottle mouth.

[0039] like Figure 5 and Figure 6 As shown, the frame support 0102 includes a first support frame, a second support frame, four optical axes 0104, a motor fixing plate 0107, and a hydraulic cylinder fixing plate 0108. The first and second support frames are symmetrically arranged to support the four optical axes 0104. The four optical axes 0104 are arranged in a left-right direction between the first and second support frames, and are distributed in an array and are all parallel. The front and rear sides of the first positioning carrier 0101 and the second positioning carrier 0105 are respectively sleeved on the optical axes 0104, and the first positioning carrier 0101 and the second positioning carrier 0105 are clamped and fixed on the optical axes 0104 by multiple optical axis fixing rings 0103. The positioning carrier is clamped and positioned by the optical axis fixing rings 0103 located on the left and right sides of the positioning carrier. The optical axis fixing rings 0103 are used to restrict the movement and positioning of the components installed on the optical axes 0104 along the axial direction of the optical axes 0104. A baffle 0106 is sleeved and fixed on the optical axis 0104. A first through hole for the internal expansion rod 0408 to pass through is provided in the middle of the baffle 0106, and a rotating sleeve 0505 is rotatably connected within the first through hole. A motor fixing plate 0107 is sleeved and fixed on the optical axis 0104 and located to the right of the baffle 0106, and is used to support the rotary drive mechanism 05. A second through hole coaxial with the first through hole is provided on the motor fixing plate 0107. A cylinder fixing plate 0108 is sleeved and fixed on the optical axis 0104 and located to the right of the baffle 0106, and is used to support the linear drive mechanism 04. A third through hole coaxial with the second through hole is provided on the cylinder fixing plate 0108. The optical axis 0104 in the above structure facilitates the movement and positioning of the first positioning carrier 0101 and the second positioning carrier 0105. The optical axis fixing ring 0103 clamps and fixes the positioning carrier, thereby fixing and locking the first positioning carrier 0101 and the second positioning carrier 0105. This provides support and facilitates adjustment and positioning, and also facilitates the installation of the rotary drive mechanism 05 and the linear drive mechanism 04.

[0040] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the first positioning part is an upward-opening arc-shaped concave surface 010101; the diameter of the arc-shaped concave surface 010101 is the same as the outer diameter of the metal bottle valve seat 0202 in the inner liner assembly 02. The second positioning part is an upward-opening positioning concave surface, with an arc-shaped segment 010502 in the middle and vertical segments 010501 on both sides. The arc diameter of the arc segment 010502 is the same as the outer diameter of the metal bottle valve seat 0202 in the inner liner assembly 02. The metal bottle valve seat 0202 has valve seat limiting planes 020201 on both sides that match the vertical section 010501. The distance between the two vertical sections 010501 is equal to the distance between the two valve seat limiting planes 020201. When the inner liner assembly 02 is placed on the first positioning carrier 0101 and the second positioning carrier 0105, the outer arc surface of the metal bottle valve seat 0202 cooperates with the arc section 010502 of the second positioning carrier 0105 to ensure the axial position of the inner liner assembly 02. At the same time, the outer valve seat limiting plane 020201 of the metal bottle valve seat 0202 cooperates with the two vertical sections 010501 of the second positioning carrier 0105 to restrict the axial rotation of the inner liner assembly 02. The above structure facilitates the engagement of the metal bottle valve seat 0202 with the arc-shaped concave surface 010101 and the positioning concave surface, thereby supporting and positioning the metal bottle valve seat 0202. At the same time, the arc-shaped segment 010502 and the vertical segment 010501 engage with the valve seat limiting plane 020201, thereby preventing the metal bottle valve seat 0202 from rotating axially.

[0041] like Figure 5 As shown, the right end of the internal expansion rod 0408 is detachably connected to the linear drive unit 0406 via a push rod coupling 0407. Both ends of the push rod coupling 0407 are threaded, with one end threaded to the linear drive unit 0406 and the other end threaded to the right end of the internal expansion rod 0408. The push rod coupling 0407 enables a detachable connection while ensuring stability and robustness.

[0042] like Figure 1 and Figure 10As shown, the internal expansion extrusion surface on the internal expansion rod 0408 includes a horizontal straight section and a conical diameter-reducing section whose diameter gradually decreases from left to right, with the horizontal straight section located to the left of the conical diameter-reducing section. When the internal expansion rod 0408 moves along the axis of the plastic inner liner 0201 under the action of the linear drive unit 0406, the internal expansion rod 0408 achieves internal expansion of the internal expansion sleeve 06 through the conical diameter-reducing section, causing the outer surface of the internal expansion sleeve 06 to press against the plastic inner liner 0201 and form a sealing surface. The conical diameter-reducing section facilitates internal expansion, and the horizontal straight section ensures that the internal expansion sleeve 06 is tightly pressed against the inner wall of the plastic inner liner 0201, ensuring a stable and sealed fit between the two.

[0043] like Figure 5 , Figure 6 and Figure 9 As shown, the linear drive mechanism 04 also includes a hydraulic station motor 0401, a pressure gauge 0402, a hydraulic oil tank 0403, and a hydraulic oil pipe 0404; the linear drive component is a hydraulic cylinder, the linear fixing part 0405 is the cylinder barrel, and the linear drive part 0406 is the cylinder push rod; the hydraulic station motor 0401 is mounted on the hydraulic oil tank 0403 and connected to the linear drive component, and the hydraulic station motor 0401 is used to drive the cylinder push rod to extend or retract; the hydraulic oil pipe 0404 is connected to the hydraulic oil tank 0403 and is used for hydraulic oil transportation; the pressure gauge 0402 is connected to the hydraulic oil pipe 0404 and is used to display the hydraulic cylinder pipeline pressure value. The hydraulic cylinder facilitates linear movement, and the hydraulic station motor 0401, pressure gauge 0402, hydraulic oil tank 0403, and hydraulic oil pipe 0404 facilitate oil circuit detection and control.

[0044] like Figure 5 , Figure 6 and Figure 9As shown, the rotary drive mechanism 05 includes a servo motor 0501, a motor coupling 0502, a dynamic torque sensor 0503, a drive gear 0504, and a sleeve bearing 0506. The servo motor 0501 is coaxially connected to the dynamic torque sensor 0503 via the motor coupling 0502, and the drive gear 0504 is coaxially connected to the dynamic torque sensor 0503. The function of the dynamic torque sensor 0503 is to acquire the output torque data of the servo motor 0501 in real time and transmit the real-time torque data to the PLC controller 0301. The rotating sleeve 0506... A rotating sleeve 0505 has an external gear 050503 on its outer surface 050502. A drive gear 0504 meshes with the external gear 050503, causing the sleeve to rotate under the drive of the drive gear 0504. The rotating sleeve 0505 is mounted on the inner expansion rod 0408 via a sleeve bearing 0506. The inner expansion sleeve 06 has an external thread 0602, and the inner surface of the metal bottle valve seat 0202 has an internal thread 020202. The inner expansion sleeve 06 is threadedly connected to the metal bottle valve seat 0202. A servo motor 0501 drives the dynamic torque sensor 0503 to rotate, and the drive gear 0504 on the dynamic torque sensor 0503 drives the rotating sleeve 0505 to rotate synchronously. This causes the rotating sleeve 0505 to drive the inner expansion sleeve 06 to rotate synchronously, thus connecting the inner expansion sleeve 06 to the metal bottle valve seat 0202.

[0045] like Figure 4 and Figure 9 As shown, the left end of the rotating sleeve 0505 is provided with a mounting hole, and the inner surface of the mounting hole is provided with two parallel sleeve hole limiting planes 050501; the inner expansion sleeve 06 is provided with a positioning plane 0603 that cooperates with the sleeve hole limiting plane 050501. The distance between the two sleeve hole limiting planes 050501 is the same as the distance between the two sleeve hole limiting planes 050501. The inner expansion sleeve 06 rotates synchronously with the rotating sleeve 0505 due to the mutual cooperation and restriction of the two limiting planes. The outer peripheral wall of the right end of the inner expansion sleeve 06 is provided with an external thread 0602, and the inner peripheral wall of the metal bottle valve seat 0202 is provided with an internal thread 020202 that is threaded to the external thread 0602. The outer peripheral wall of the left end of the inner expansion sleeve 06 is provided with three annular protrusions 0601. After internal expansion, the annular protrusions 0601 are sealed to the inner peripheral wall of the plastic inner liner 0201. The internal expansion pull rod 0408 causes permanent plastic deformation of the annular protrusions 0601 of the inner expansion sleeve 06, pressing the annular protrusions 0601 against the plastic inner liner 0201 to form a sealing surface (see sealing surface section). Figure 2(As shown in the enlarged view). The limiting plane 050501 and the positioning plane 0603 of the sleeve hole facilitate the fixed connection and synchronous rotation of the rotating sleeve 0505 and the inner expansion sleeve 06. The external thread 0602 and the internal thread 020202 of the connecting thread facilitate the threaded connection of the inner expansion sleeve 06 to the metal bottle valve seat 0202 for fixation, thereby facilitating the subsequent inner expansion operation of the inner expansion rod 0408 and improving the inner expansion efficiency.

[0046] like Figure 5 , Figure 6 and Figure 9 As shown, it also includes a centralized control mechanism 03, which includes a PLC controller 0301, a touch screen display 0302, and an emergency stop switch 0303. The PLC controller 0301 receives control commands from the dynamic torque sensor 0503. The touch screen display 0302 and the emergency stop switch 0303 are respectively mounted on the PLC controller 0301. The touch screen display 0302 displays and controls the linear drive mechanism 04 and the rotary drive mechanism 05, and sets the equipment operating parameters, including the speed of the servo motor 0501, the preset torque value when the servo motor 0501 stops, the cylinder push rod extension time, extension speed, extension distance, push rod retraction, and other parameters. The emergency stop switch 0303 immediately stops the equipment and cuts off power in an emergency. The centralized control mechanism 03 allows for convenient control of the linear drive mechanism 04 and the rotary drive mechanism 05, facilitating internal expansion operations, achieving semi-automation, greatly saving manpower, and improving efficiency.

[0047] A sealing device and method for the mouth of a high-pressure hydrogen storage container with a plastic liner, comprising the following steps:

[0048] S1. Install the internal expansion rod: Push the linear drive unit 0406 in the linear drive mechanism 04 to the designated position through the touch screen 0302 of the centralized control mechanism 03, and connect the internal expansion rod 0408 to the linear drive unit 0406 through the push rod coupling 0407.

[0049] S2. Fix the inner expansion sleeve: Install the inner expansion sleeve 06 inside the rotating sleeve 0505; install the inner expansion sleeve 06 inside the rotating sleeve 0505 according to the principle of matching the limiting plane with the limiting plane and the arc surface with the arc surface;

[0050] S3. Place the plastic inner liner: Place the inner liner assembly 02 on the first positioning carrier 0101 and the second positioning carrier 0105. The two valve seat limiting planes 020201 on the metal bottle valve seat 0202 in the inner liner assembly 02 cooperate with the two vertical sections 010501 on the second positioning carrier, so that the first positioning part and the second positioning part limit and fix the metal bottle valve seats 0202 on both sides.

[0051] S4. Install the inner expansion sleeve: Start the switch via the touch screen 0302 of the centralized control mechanism 03. The rotary drive mechanism 05 starts working under the control of the PLC. The inner expansion sleeve 06 and the rotating sleeve 0505 start to rotate under the drive of the servo motor 0501 in the rotary drive mechanism 05. Gently push the metal bottle valve seat 0202 along the axial direction of the inner liner assembly 02. Under the drive of the rotary drive mechanism 05, the connecting external thread 0602 of the inner expansion sleeve 06 gradually screws into the connecting internal thread 020202 of the metal bottle valve seat 0202. When the thread is screwed to the end, the torque value collected by the dynamic torque sensor 0503 gradually increases and transmits the data to the PLC controller 0301 in real time. When the real-time torque value reaches the set value, the PLC controller 0301 stops the servo motor 0501, and the installation of the inner expansion sleeve 06 is completed.

[0052] S5. Inner expansion sleeve expands: After step S4 is completed, PLC controller 0301 stops servo motor 0501 and starts hydraulic station motor 0401. Linear drive part 0406 in linear drive component of linear drive mechanism 04 retracts and drives inner expansion rod 0408 to move axially along inner liner assembly 02 during this process. Inner expansion sleeve 06 expands through inner expansion rod 0408. Inner expansion sleeve 06 undergoes permanent plastic deformation. Its annular protrusion 0601 presses against plastic inner liner to form a sealing surface.

[0053] S6. Take out the inner liner assembly 02 along the pushing direction of the linear drive part 0406, flip the inner liner assembly 02 to the other end, and repeat steps S1-S5 to complete the sealing of the other end of the inner liner assembly 02.

[0054] S7. Complete: Remove the inner liner assembly 02 along the push-out direction of the linear drive unit 0406 to complete the sealing of both ends of the hydrogen storage bottle.

[0055] In summary, the advantages of this invention are that the device has a high degree of automation, requiring only minimal manual operation during operation, thus improving the efficiency of the internal expansion and sealing of the high-pressure hydrogen storage container with a plastic liner; both the linear drive mechanism 04 and the rotary drive mechanism 05 are controlled by a PLC controller 0301, effectively ensuring the consistency and accuracy of the internal expansion and sealing structure of the high-pressure hydrogen storage container with a plastic liner; the rapid positioning structure enables the axial positioning and rotational limit of the inner liner component 02, facilitating quick and high-precision coaxial alignment between the inner liner component 02 and the linear drive component, greatly improving the overall internal expansion efficiency and quality.

[0056] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0057] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A plastic liner high-pressure hydrogen storage container bottle mouth sealing device, characterized in that, The system includes a hydrogen storage cylinder positioning mechanism, a linear drive mechanism, and a rotary drive mechanism. The hydrogen storage cylinder positioning mechanism includes a frame support, a first positioning carrier, and a second positioning carrier. The first and second positioning carriers are fixedly connected to the left and right sides of the frame support, respectively. The first positioning carrier has a first positioning part, and the second positioning carrier has a second positioning part, which cooperate to position the metal cylinder valve seats on the left and right sides. A limiting part is provided on the frame support to the right of the second positioning carrier to restrict the movement of the plastic inner liner during internal expansion sealing. The linear drive mechanism includes a linear drive component and an internal expansion rod. The linear drive component includes a linear fixing part and a linear drive part. A linear fixing part is mounted on a frame support. The linear drive part is movably connected to the linear fixing part. The right end of the inner expansion rod is detachably connected to the linear drive part. The left end of the inner expansion rod passes through the right side of the metal bottle valve seat and extends into the plastic inner liner. An inner expansion extrusion surface is provided on the outer peripheral wall of the left end of the inner expansion rod. A rotating sleeve is rotatably sleeved on the inner expansion rod. An inner expansion sleeve is connected to the left side of the rotating sleeve. The inner expansion sleeve is sleeved on the inner expansion rod and extends into the metal bottle valve seat. The rotary drive mechanism is driven by the rotating sleeve and is used to drive the rotating sleeve to rotate. During connection, the inner expansion sleeve is threadedly connected to the metal bottle valve seat. The first positioning part is an arc-shaped concave surface with an opening facing upwards; the second positioning part is a positioning concave surface with an opening facing upwards, and the middle of the positioning concave surface is an arc-shaped segment, and the two sides of the positioning concave surface are vertical segments; the two sides of the metal bottle valve seat are provided with valve seat limiting planes that match the vertical segments. The frame support includes a first support frame, a second support frame, multiple optical axes, a motor fixing plate, and a hydraulic cylinder fixing plate. The multiple optical axes are arranged horizontally between the first and second support frames, and are all parallel to each other. The first and second positioning carriers are respectively sleeved on the optical axes, and both are clamped and fixed to the optical axes by multiple optical axis fixing rings. The limiting part is a baffle, which is sleeved and fixed on the optical axes. The motor fixing plate is sleeved and fixed on the optical axes and located to the right of the baffle, and is used to support the rotary drive mechanism. The hydraulic cylinder fixing plate is sleeved and fixed on the optical axes and located to the right of the baffle, and is used to support the linear drive mechanism. The internal expansion compression surface on the internal expansion rod includes a horizontal straight section and a conical diameter-changing section whose diameter gradually decreases from left to right, with the horizontal straight section located to the left of the conical diameter-changing section. When the internal expansion rod moves along the axis of the plastic inner liner under the action of the linear drive unit, the internal expansion rod realizes the internal expansion of the internal expansion sleeve through the conical diameter-changing section, so that the outer surface of the internal expansion sleeve presses against the plastic inner liner and forms a sealing surface.

2. The plastic liner high pressure hydrogen storage container neck seal apparatus of claim 1, wherein, The right end of the internal expansion rod is detachably connected to the linear drive unit via a push rod coupling. Both ends of the push rod coupling are threaded, with one end of the push rod coupling threaded to the linear drive unit and the other end of the push rod coupling threaded to the right end of the internal expansion rod.

3. The plastic liner high pressure hydrogen storage container neck seal apparatus of claim 2, wherein, The linear drive mechanism further includes a hydraulic station motor, a pressure gauge, a hydraulic oil tank, and hydraulic oil pipes; the linear drive component is a hydraulic cylinder, the linear fixing part is the cylinder barrel, and the linear drive part is the cylinder push rod; the hydraulic station motor is mounted on the hydraulic oil tank and connected to the linear drive component, and the hydraulic station motor is used to drive the cylinder push rod to extend or retract; the hydraulic oil pipes are connected to the hydraulic oil tank and are used for hydraulic oil transportation; the pressure gauge is connected to the hydraulic oil pipes and is used to display the hydraulic cylinder pipeline pressure value.

4. The plastic liner high pressure hydrogen storage container neck seal apparatus of claim 3, wherein, The rotary drive mechanism includes a servo motor, a motor coupling, a dynamic torque sensor, a drive gear, and a sleeve bearing. The servo motor is coaxially connected to the dynamic torque sensor via the motor coupling. The drive gear is coaxially connected to the dynamic torque sensor. The drive gear meshes with the outer peripheral wall of the rotating sleeve, and the rotating sleeve is sleeved on the inner expansion rod via the sleeve bearing.

5. The sealing device for the bottle mouth of a high-pressure hydrogen storage container with a plastic inner liner according to claim 4, characterized in that, The left end of the rotating sleeve is provided with a mounting hole, and the inner surface of the mounting hole is provided with two parallel sleeve hole limiting planes; the inner expansion sleeve is provided with a positioning plane that mates with the sleeve hole limiting planes, so that the inner expansion sleeve and the rotating sleeve can rotate synchronously; the outer peripheral wall of the right end of the inner expansion sleeve is provided with a connecting external thread, and the inner peripheral wall of the metal bottle valve seat is provided with a connecting internal thread that is threaded to the connecting external thread; the outer peripheral wall of the left end of the inner expansion sleeve is provided with at least one annular protrusion, which, after internal expansion, is sealed to the inner peripheral wall of the plastic liner.

6. The plastic liner high pressure hydrogen storage container neck seal apparatus of claim 5, wherein, It also includes a centralized control mechanism, which includes a PLC controller, a touch screen display, and an emergency stop switch. The PLC controller is used to receive signals from the linear drive mechanism and the rotary drive mechanism and send control commands. The touch screen display and the emergency stop switch are respectively installed on the PLC controller. The touch screen display is used to display and control the linear drive mechanism and the rotary drive mechanism, and to set the equipment operating parameters. The emergency stop switch is used to immediately stop the equipment operation and cut off the power in an emergency.

7. A sealing method for a high-pressure hydrogen storage container bottle mouth sealing device with a plastic inner liner, characterized in that, The sealing device for the high-pressure hydrogen storage container with a plastic liner as described in claim 6 comprises the following steps: S1. Install the internal expansion rod: Push the linear drive component in the linear drive mechanism to the designated position through the touch screen of the centralized control mechanism, and connect the right end of the internal expansion rod to the linear drive unit. S2. Fix the inner expansion sleeve: Install the inner expansion sleeve inside the rotating sleeve; S3. Place the plastic inner liner: Place the inner liner assembly on the first positioning carrier and the second positioning carrier, and limit and fix the metal bottle valve seats on both sides through the first positioning part and the second positioning part. S4. Install the inner expansion sleeve: Start the switch through the touch screen of the centralized control mechanism. The rotary drive mechanism starts working under the control of PLC. The inner expansion sleeve and the rotating sleeve start to rotate under the drive of the rotary drive mechanism. Gently push the metal bottle valve seat along the axial direction of the inner liner assembly. Under the drive of the rotary drive mechanism, the inner expansion sleeve gradually screws into the metal bottle valve seat. When the thread is screwed to the end, the torque value gradually increases and the data is transmitted to the PLC controller in real time. When the real-time torque value reaches the set value, the PLC controller stops the rotary drive mechanism and completes the installation of the inner expansion sleeve. S5. Inner expansion sleeve expands: After step S4 is completed, the PLC controller stops the rotation drive mechanism and starts the linear drive mechanism. The linear drive part in the linear drive mechanism retracts and drives the inner expansion rod to move axially along the inner liner assembly. The inner expansion sleeve expands through the inner expansion rod. The inner expansion sleeve undergoes plastic permanent deformation and presses the plastic inner liner to form a sealing surface. S6. Complete: Remove the inner liner assembly along the push-out direction of the linear drive section.

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