Blow molding process and equipment for plastic inner container of IV-type hydrogen storage cylinder

Abstract

The invention discloses a blow molding process and equipment for a plastic liner of an IV-type hydrogen storage cylinder. The equipment comprises the following parts: a hydraulic cylinder, a storage cylinder, a heating ring, a hopper, an upper platform, molten iron, a suspension platform, a case, a console, a forming mold a, a fixed mold plate, a mechanical claw, a linear guide rail, a fixed claw table, an air blowing pipe, a forming mold b, a movable mold plate, a clamping device, a shear knife, a gear mechanism, a toggle rod mechanism, an adjustable mouth mold mechanism, a mechanical arm and a discharge pipe. In the extrusion process, the opening degree of the adjustable mouth mold mechanism is controlled through an operation table, the opening degree of the mouth mold is firstly reduced, then increased and then reduced, it is guaranteed that the initial opening degree and the termination opening degree of the mouth mold are consistent, it is guaranteed that materials smoothly penetrate through inserts of an upper opening and a lower opening, and the influence of gravity on the blanking amount is compensated so that the materials can be matched with the bottle opening inserts; in the driving mode of the die mechanism, a toggle rod mechanism drives the opening degree of the die to be adjusted or a gear and rack mechanism drives the opening degree of the die to be adjusted, the control precision can be improved, and the application range can be widened.

Description

Technical Field

[0001] The present invention belongs to the field of composite material forming equipment, and particularly relates to a blow molding equipment for manufacturing hollow composite material products. Background Art

[0002] Type-IV hydrogen storage bottles have become a new generation of high-pressure hydrogen transportation and storage containers due to their advantages such as light weight, good fatigue resistance, and high hydrogen storage density. Compared with Type-III hydrogen storage bottles, the biggest difference in the structural materials of Type-IV hydrogen storage bottles is that the metal inner liner is replaced with a plastic inner liner. This not only significantly reduces the weight of the gas cylinder, reduces energy consumption, but also effectively avoids the problem of metal hydrogen embrittlement of the inner liner, resulting in a significant increase in hydrogen storage density.

[0003] Large hollow polymer or polymer composite products are usually formed by methods such as blow molding, rotational molding, injection welding, winding, or transfer molding. As a typical hollow product, the plastic inner liner of a Type-IV hydrogen storage bottle requires high forming accuracy and forming efficiency. The most commonly used forming methods are blow molding, rotational molding, and injection welding. Blow molding mainly includes three steps: parison forming, blow molding, and cooling and demolding. Parison forming is to heat plastic particles or filaments to a molten state and then extrude the plastic into a tubular parison; blow molding is to place the molten plastic parison into a blow mold and then inject compressed air into the parison to make it expand and adhere to the inner wall of the mold to form the required hollow product; cooling and demolding is to cool the blow-molded plastic product to room temperature through a cooling system, shape it into the final product, and then demold and take out the product.

[0004] In addition, for some large products, especially the plastic inner liners of Type-IV hydrogen storage bottles used in long tube trailers or hydrogen refueling stations, they have a large aspect ratio, small wall thickness, high requirements for wall thickness uniformity, and high requirements for the performance stability of the inner liner, which pose new challenges to the forming equipment and process. For example, during the processing of plastic inner liners with a large aspect ratio and large diameter, when the high-temperature material falls, it is affected by gravity, resulting in the lower part of the material sagging, causing the material to accumulate below and the density of the lower part to increase, resulting in a decrease in the wall thickness uniformity of the formed product after blow molding. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage bottle. In the forming process of the plastic inner liner of the type-IV hydrogen storage bottle, a blow molding integrated forming platform with an adjustable die and a robotic arm are coordinated to control the blanking amount, better fit the plastic inner liner cylinder and the end head insert, and at the same time compensate for the influence of gravity on blanking, so as to improve the uniformity and rationality of the wall thickness of the head and cylinder of the plastic inner liner of the hydrogen storage bottle, and the wall thickness at different positions can be adjusted according to specific requirements. In the design of the die structure, a die mechanism with adjustable opening is independently designed to meet the production requirements of high-efficiency, stable and uniform-wall-thickness thin-walled plastic inner liners. In the driving mode of the die mechanism, methods such as a toggle mechanism driving the die opening adjustment and a rack and pinion mechanism driving the die opening adjustment are proposed to improve the control accuracy and the applicable range. In the processing technology, using the blow molding integrated forming platform, first melt and mix the plastic particles, the melt enters the head to form a tubular preform, after the preform reaches a predetermined length, it is blown, air is blown into the preform to blow up the preform and make it close to the mold cavity for forming; finally, cool the product; open the mold and take away the cold-hardened product.

[0006] The technical solution to achieve the above object is: a blow molding equipment for the plastic inner liner of a type-IV hydrogen storage bottle, mainly including a driving system, a mold system, a heating and cooling system, a control system, etc. The above systems include the following component structures: hydraulic cylinder, storage cylinder, heating coil, hopper, upper platform, melting iron, suspension platform, chassis, console, forming mold a, fixed template, mechanical gripper, linear guide rail, fixed gripper platform, blow pipe, forming mold b, moving template, clamping device, shear knife, gear mechanism, toggle mechanism, adjustable die mechanism, robotic arm and discharge pipe.

[0007] An IV-type hydrogen storage bottle plastic inner liner blow molding equipment of the present invention, the connection method of the main components is as follows: The base platform is fixedly connected to the ground, and the linear guide rail is fixedly welded to the base platform to ensure the linear movement of the moving template on the linear guide rail. The moving template is slidably connected to the linear guide rail, the fixed template is fixedly connected to the linear guide rail, and a limiting device is arranged on the linear guide rail to ensure the limit distance of the sliding limit of the moving template. The forming die a and the forming die b are respectively fixedly connected to the moving template and the fixed template, and the forming die follows the moving template to linearly move along the linear guide rail. The fixed claw platform is fixedly connected to the middle position of the linear guide rail by welding, and is on the same central axis as the discharge pipe to ensure coaxiality. The mechanical claw hand is connected to the fixed claw platform by a pin shaft, and the mechanical claw hand can rotate around the pin shaft. The mechanical claw hand is used to grab the metal insert at the bottle mouth and cooperate with the forming die to complete the blow molding process of the IV-type hydrogen storage bottle plastic inner liner with a metal insert. The chassis is fixedly connected to the base platform, the control console is fixedly connected to the chassis and the bottom platform, and the forming process of the IV-type hydrogen storage bottle plastic inner liner blow molding process is controlled through the control console. The upper platform is fixedly connected to the chassis through a connecting block, and during the working process, devices such as the upper heating coil and the material storage cylinder are isolated from the chassis and the control console, improving the operation safety. The hopper is fixedly connected to the material storage cylinder, and the material is added through the hopper. The heating coils are arranged at equal intervals on the material storage cylinder, and each heating coil is fixedly connected to the material storage cylinder as an independent component. The heating coil can turn the material into a molten state. The hydraulic cylinder is fixedly connected above the discharge pipe through bolts and flanges, and the annular melting iron is fixedly connected to the outside of the discharge pipe to directly heat and control the temperature of the raw material to improve the extrusion efficiency. The hydraulic cylinder, the discharge pipe and the melting iron are vertically arranged. The adjustable die head mechanism is connected to the discharge pipe by bolts, and the opening size of the die head can be adjusted according to needs to adapt to the diameter or shape of different products, thereby improving the production efficiency. The shear knife is connected to the hanging platform extended from the upper platform, and the opening and closing of the shear knife are driven by a gear and rack mechanism to realize the cutting operation of the molten material. The clamping device is connected to the hanging platform, and the clamping device is driven to move in the vertical and horizontal directions by a gear and rack mechanism to realize the clamping and fixing of the melt blank. The robotic arm is connected to the base platform by bolts and flanges, and the insert is clamped by the robotic arm and stays above the mold to realize the integrated molding of the insert and the cylinder body. The blowing pipe is arranged in the middle of the fixed claw platform and is connected to an external air source. Air is blown into the mold through the blowing pipe to apply a blow molding pressure to blow and expand the molten plastic material and make it closely adhere to the inner wall of the mold, thereby forming the required hollow product.

[0008] The adjustable die head mechanism of the present invention includes a base, blades, elastic washers, blade actuating rings, covers and drive handles, wherein:

[0009] The base of the adjustable die mechanism is provided with an axial threaded through-hole and is connected to the discharge port through a bolt; the base of the adjustable die mechanism is provided with an annular groove, and the length of the groove is the stroke length of the driving handle; the base of the adjustable die mechanism is provided with a radial threaded through-hole and is connected to the cover plate through a stud.

[0010] The blade of the adjustable die mechanism is a fully chamfered annular metal sheet structure. Single metal guide posts are distributed vertically at both ends of the blade, and the diameter of the metal guide post is smaller than the circumferential length of the blade.

[0011] The elastic washer is a semi-open spring washer, which provides additional friction to maintain the relative position of the cover plate and the base, and improves the stability and reliability of the connection.

[0012] The blade actuating ring of the adjustable die mechanism is provided with radial grooves, which are circumferentially distributed at equal intervals; the circumferential length of the groove is consistent with the size of the blade metal guide post; a single threaded through-hole is radially opened in the blade actuating ring of the adjustable die mechanism and is connected to the driving handle.

[0013] The top of the cover plate is provided with a through-hole, which is connected to the blade metal guide post; the side is provided with a circumferential rectangular groove, and the length of the groove is the stroke length of the driving handle; the cylindrical curved surface of the outer contour of the cover plate is in close contact with the inner cylindrical surface of the base and is connected through the threaded holes and studs penetrating the base and the cover plate; the bottom of the cover plate is provided with a circumferential groove for accommodating the elastic washer, and the elastic washer and the circumferential groove are arranged in cooperation at the bottom of the base

[0014] The driving handle is of an L-shaped structure, and an external thread is provided at the tail, which is tightly connected to the blade actuating ring through a thread; under the action of an external force, the driving handle rotates to drive the blade actuating ring to rotate, and then drives the blade to open and close.

[0015] An IV-type hydrogen storage bottle plastic inner liner blow molding equipment of the present invention, and the molding process is as follows: First, check the working condition of the equipment; install the inserts of the inner liner on the fixed jaw platform first and fix them with the mechanical gripper; connect the gas path channel; fill the material, and control the operating console to turn on the heating system to heat and melt the material; the molten material enters the discharge pipe through the storage cylinder; apply pressure through the hydraulic cylinder to extrude the material from the die; during the extrusion process, control the opening degree of the adjustable die mechanism through the operating console, adjust the die opening degree to decrease first, then increase, and then decrease, ensure that the starting opening degree and the ending opening degree of the die are the same, ensure that the material smoothly passes through the inserts with upper and lower openings, compensate for the influence of gravity on the material dropping amount to make the material cooperate with the bottle mouth insert, and prepare for the blowing process; after the material passes through the bottom insert and reaches the specified position, operate the clamping device to clamp the melt blank; operate the shear knife to cut off the melt blank; operate the robotic arm to clamp the insert and move it above the shear knife, and hold the raw material by extending the clamping device into the through hole of the insert to maintain the shape and position of the material; the robotic arm moves downward to drive the insert to move to the specified position and cooperate with the mold; control the operating console to drive the mold closing system to work, the moving template moves along the linear guide rail towards the fixed template, and the mold is closed to complete the mold closing action; inject gas into the mold through the lower blow pipe, blow up the material and make it close to the inner wall of the mold to form a hollow product; control the operating console to start the cooling system to cool the whole mold; after the mold is cooled, open the mold, and hold the formed inner liner product by the robotic arm and take it off.

[0016] As an alternative, for the IV-type hydrogen storage bottle plastic inner liner blow molding process that only requires a single insert, the robotic arm operation step can be omitted. After installing the insert on the fixed jaw platform, control the operating console to extrude the molten material through the adjustable die mechanism, adjust the die opening degree to decrease first, then increase, and then decrease, ensure that the starting opening degree and the ending opening degree of the die are the same, ensure that the material smoothly passes through the inserts with upper and lower openings, and then obtain the required product through subsequent processes such as mold closing, cooling, and mold opening.

[0017] The driving form and process requirements of the adjustable die mechanism of the present invention include the following two schemes:

[0018] Scheme 1: Drive the driving handle of the adjustable die mechanism to rotate through the toggle mechanism, thereby driving the blades to open and close to realize the adjustment of the material dropping amount; adjust the die opening degree to decrease first, then increase, and then decrease, ensure that the starting opening degree and the ending opening degree of the die are the same, make the material smoothly pass through the inserts with upper and lower openings, compensate for the influence of gravity on the material dropping amount to make the material cooperate with the bottle mouth insert, and prepare for subsequent processes such as blowing and mold opening and closing.

[0019] Solution 2: The adjustable die mechanism driving handle is rotated by a gear-rack mechanism, thereby driving the blades to open and close, realizing the adjustment of the blanking amount; the die opening is adjusted to decrease first, then increase, and then decrease again, ensuring that the initial and final die openings are the same, enabling the material to smoothly pass through the inserts with upper and lower openings, compensating for the influence of gravity on the blanking amount, making the material cooperate with the bottle mouth insert, and preparing for subsequent processes such as blowing and mold opening and closing.

[0020] One end of the clamping device of the present invention is connected to the suspension platform and is driven by a gear-rack mechanism; a mechanical claw is provided at one end, and the opening and closing of the mechanical claw are used to clamp the molten material; the clamping device can move linearly in the vertical and horizontal directions; during the working process of the clamping device, it cooperates with various mechanisms and does not interfere with each other.

[0021] A manufacturing method of a type-IV plastic inner liner of a hydrogen storage bottle for a type-IV hydrogen storage bottle plastic inner liner blow molding process of the present invention, including the following steps:

[0022] Step 1: Check the working conditions of the components, first install the insert of the inner liner on the bottom fixed claw table, and fix it with the mechanical claw hand;

[0023] Step 2: Connect the gas path channel; add the material, and control the operation console to turn on the heating system to heat the molten material;

[0024] Step 3: Control the opening size of the adjustable die mechanism, adjust the die opening to decrease first, then increase, and then decrease again, ensuring that the melt preform smoothly passes through the inserts with upper and lower openings;

[0025] Step 4: After the material passes through the bottom insert and reaches the specified position, operate the clamping device 1 to clamp the melt preform; operate the shear knife to cut off the melt preform;

[0026] Step 5: Operate the robotic arm to clamp the insert and move it above the clamping device 1, switch the clamping device 2 to extend into the insert through-hole from above to clamp the raw material, and the robotic arm moves downward to drive the insert to move to the specified position and cooperate with the mold;

[0027] Step 6: Control the moving template to move along the linear guide rail towards the fixed template to close the mold and complete the mold closing action;

[0028] Step 7: Open the blow air pipeline and inject air into the mold through the lower blow air pipe to blow up the material and make it closely adhere to the inner wall of the mold to form a hollow product;

[0029] Step 8: Control the operation console to start the cooling system to cool the entire mold; after the mold is cooled, open the mold, and clamp the formed inner liner product with the robotic arm and remove it.

[0030] The present invention relates to a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder, which introduces advanced process design and supporting mechanical equipment to achieve the efficient production of the plastic inner liner of the type-IV hydrogen storage cylinder. In particular, the design of an adjustable die structure, the selection of various driving methods, the implementation of the forming process for single-sided and double-sided inserts, etc. Structural adjustments and simple replacements made based on the basic idea of the present invention fall within the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is the overall schematic diagram of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0032] Figure 2 FIG. is the structural schematic diagram of an adjustable die mechanism of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0033] Figure 3 FIG. is the schematic diagram of a toggle mechanism driving device of an adjustable die mechanism of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0034] Figure 4 FIG. is the schematic diagram of a rack and pinion driving device of an adjustable die mechanism of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0035] Figure 5 FIG. is the schematic diagram of a single-sided insert forming process of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0036] Figure 6 FIG. is the schematic diagram of a double-sided insert forming process of a blow molding process and equipment for the plastic inner liner of a type-IV hydrogen storage cylinder according to the present invention.

[0037] In the figure: 1 - hydraulic cylinder; 2 - storage cylinder; 3 - heating coil; 4 - hopper; 5 - upper platform; 6 - molten iron; 7 - suspension platform; 8 - chassis; 9 - control console; 10 - forming die (a); 11 - fixed template; 12 - mechanical gripper; 13 - linear guide rail; 14 - fixed gripper platform; 15 - blow pipe; 16 - forming die (b); 17 - moving template; 18 - clamping device; 18-1 - clamping device 1; 18-2 - clamping device 2; 19 - shear knife; 20 - adjustable die mechanism; 21 - robotic arm; 22 - discharge pipe; 23 - slider; 24 - connecting rod; 25 - rack; 26 - gear 1; 27 - gear 2; 28 - gear 3; 29 - melt embryo; 30 - insert. DETAILED DESCRIPTION OF THE INVENTION

[0038] As Figure 1As shown in the figure, a type-IV hydrogen storage bottle plastic inner liner blow molding equipment of the present invention mainly includes a drive system, a mold system, a heating and cooling system, a control system, etc. The above systems include the following component structures: hydraulic cylinder 1, material storage cylinder 2, heating coil 3, hopper 4, upper platform 5, molten iron 6, suspension platform 7, chassis 8, control console 9, forming mold (a) 10, fixed template 11, mechanical gripper 12, linear guide rail 13, fixed gripper table 14, blow pipe 15, forming mold (b) 16, moving template 17, clamping device 18, shearing knife 19, adjustable die head mechanism 20, robotic arm 21, discharge pipe 22, 23 - slider; 24 - connecting rod; 25 - rack; 26 - gear 1; 27 - gear 2; 28 - gear 3. The clamping device 18 includes 18-1 clamping device 1 and 18-2 clamping device 2. As Figure 2 shown, the adjustable die head mechanism structure 20 includes a base 20-1, a blade 20-2, an elastic washer 20-3, a blade actuating ring 20-4, a cover plate 20-5, and a drive handle 20-6.

[0039] The connection methods of the main components of a type-IV hydrogen storage bottle plastic inner liner blow molding equipment of the present invention are as follows: The base platform is fixedly connected to the ground, and the linear guide rail 13 is fixedly welded to the base platform to ensure the linear movement of the moving template 17 on the linear guide rail 13. The moving template 17 is slidably connected to the linear guide rail 13, and the fixed template 11 is fixedly connected to the linear guide rail 13. A limiting device is provided on the linear guide rail 13 to ensure the limiting extreme distance of the sliding of the moving template 17. The molding die (a) 10 and the molding die (b) 16 are respectively fixedly connected to the moving template and the fixed template, and the molding die (b) 16 follows the moving template 17 to linearly move along the linear guide rail 13. The fixed claw platform 14 is fixedly connected to the middle position of the linear guide rail 13 by welding and is on the same central axis as the discharge pipe 22 to ensure coaxiality. The mechanical claw 12 is connected to the fixed claw platform 14 by a pin shaft, and the mechanical claw 12 can rotate around the pin shaft. The mechanical claw 12 is used to grasp the metal insert 30 at the bottle mouth and cooperate with the molding die to complete the blow molding process of the type-IV hydrogen storage bottle plastic inner liner with the metal insert 30. The chassis 8 is fixedly connected to the base platform, and the control console 9 is fixedly connected to the chassis 8 and the bottom platform. The forming process of the type-IV hydrogen storage bottle plastic inner liner blow molding process is controlled through the control console 9. The upper platform 5 is fixedly connected to the chassis 8 through a connecting block. During the working process, devices such as the upper heating coil 3 and the material storage cylinder 2 above are isolated from the chassis 8 and the control console 9 to improve operation safety. The hopper 4 is fixedly connected to the material storage cylinder 2, and feeding is carried out through the hopper 4. The heating coils 3 are arranged at equal intervals on the material storage cylinder 2. Each heating coil 3 is fixedly connected to the material storage cylinder 2 as an independent component. The heating coil 3 can convert the material into a molten state. The hydraulic cylinder 1 is fixedly connected above the discharge pipe 22 by bolts and flanges. The annular melting iron 6 is fixedly connected to the outside of the discharge pipe 22 to directly heat and control the temperature of the raw material to improve the extrusion efficiency. The hydraulic cylinder 1, the discharge pipe 22, and the melting iron 6 are vertically arranged. The adjustable die head mechanism 20 is connected to the discharge pipe 22 by bolts, and the opening size of the die head can be adjusted as needed to adapt to the diameter or shape of different products, thereby improving production efficiency. The shear blade 19 is connected to the suspension platform 7 extending from the upper platform 5, and the opening and closing of the shear blade 19 are driven by a gear-rack mechanism to realize the cutting operation of the molten material. The clamping device 18 is connected to the suspension platform 7, and the clamping device 18 is driven by a gear-rack mechanism to move in the vertical and horizontal directions to realize the clamping and fixing of the melt blank 29. The robotic arm 21 is connected to the base platform by bolts and flanges. The insert 30 is clamped by the robotic arm 21 and stays above the mold to realize the integrated molding of the insert 30 and the cylinder body. The blow pipe 15 is arranged in the middle of the fixed claw platform and is connected to an external air source. Air is blown into the mold through the blow pipe 15 to apply a blow molding pressure to blow and expand the molten plastic material and make it closely adhere to the inner wall of the mold, thereby forming the required hollow product.

[0040] A type-IV hydrogen storage bottle plastic inner liner blow molding equipment of the present invention, such asFigure 6 The forming process shown is as follows: First, check the working condition of the equipment; install the insert 30 of the inner liner on the fixed jaw platform 14 first and fix it with the mechanical gripper 12; connect the air path channel; fill the material, and control the operation console 9 to turn on the heating system to heat and melt the material; the molten material enters the discharge pipe 22 through the storage cylinder 2; apply pressure through the hydraulic cylinder 1 to extrude the material from the die; during the extrusion process, control the opening degree of the adjustable die mechanism 20 through the operation console 9, adjust the die opening degree to decrease first, then increase, and then decrease again, ensure that the starting opening degree and the ending opening degree of the die are the same, ensure that the material smoothly passes through the insert with upper and lower openings, compensate for the influence of gravity on the falling material amount to make the material cooperate with the bottle mouth insert, and prepare for the blowing process; after the material passes through the bottom insert 30 and reaches the specified position, operate the clamping device 18 to clamp the melt blank 29; operate the shear knife 19 to cut off the melt blank 29; operate the robotic arm 21 to clamp the insert and move it above the shear knife 19, extend the clamping device 18 into the through hole of the insert to clamp the raw material, and maintain the shape and position of the material; the robotic arm 21 moves downward to drive the insert to move to the specified position and cooperate with the mold; control the operation console 9 to drive the mold closing system to work, the moving template 17 moves along the linear guide rail 13 towards the fixed template 11, and the mold closes to complete the mold closing action; inject gas into the mold through the lower blow pipe 15 to blow up the material and make it closely adhere to the inner wall of the mold to form a hollow product; control the operation console to start the cooling system to cool the whole mold; after the mold cools, open the mold, and clamp the formed inner liner product with the robotic arm 21 and take it off.

[0041] As an alternative, as Figure 5 shown, for the blow molding process of the plastic inner liner of the type-IV hydrogen storage bottle that only requires a single insert, the operation step of the robotic arm 21 can be omitted. After installing the insert 30 on the fixed jaw platform 14, control the operation console 9 to extrude the molten material through the adjustable die mechanism 21, adjust the die opening degree to decrease first, then increase, and then decrease again, ensure that the starting opening degree and the ending opening degree of the die are the same, ensure that the material smoothly passes through the insert 30 with upper and lower openings, and then through processes such as mold closing, cooling, and mold opening, the required product can be obtained.

[0042] The adjustable die mechanism described in the present invention includes a base 20-1, a blade 20-2, an elastic washer 20-3, a blade actuating ring 20-4, a cover plate 20-5, and a driving handle 20-6, where:

[0043] The base 20-1 of the adjustable die mechanism is provided with an axial threaded through hole and is connected to the discharge port through a bolt; the base of the adjustable die mechanism is provided with an annular groove, and the length of the groove is the stroke length of the driving handle; the base of the adjustable die mechanism is provided with a radial threaded through hole and is connected to the cover plate 20-5 through a stud.

[0044] The blade 20-2 of the adjustable die mechanism is a full-chamfered annular metal sheet structure. Single metal guide posts are distributed vertically at both ends of the blade, and the diameter of the metal guide post is smaller than the circumferential length of the blade 20-2.

[0045] The elastic washer 20-3 is a semi-open spring washer, which provides additional friction to maintain the relative position of the cover plate 20-5 and the base 20-1, improving the stability and reliability of the connection.

[0046] The adjustable die mechanism blade actuating ring 20-4 is provided with radial grooves, which are circumferentially distributed at equal intervals; the circumferential length of the grooves is consistent with the size of the blade metal guide post; the adjustable die mechanism blade actuating ring 20-4 is radially provided with a single threaded through hole, which is connected to the driving handle 20-6.

[0047] The top of the cover plate 20-5 is provided with a through hole, which is connected to the blade metal guide post; the side is provided with a circumferential rectangular groove, and the length of the groove is the stroke length of the driving handle; the cylindrical curved surface of the outer contour of the cover plate is in close contact with the inner cylindrical curved surface of the base, and is connected by a threaded hole and a stud passing through the base 20-1 and the cover plate 20-5; the bottom of the cover plate 20-5 is provided with a circumferential groove for accommodating the elastic washer 20-3, and the elastic washer 20-3 and the circumferential groove are arranged in cooperation at the bottom of the base 20-1

[0048] The driving handle 20-6 is an L-shaped structure, and the tail is provided with an external thread, which is fixedly connected to the blade actuating ring 20-4 by a thread; under the action of the outside world, the driving handle 20-6 rotates to drive the blade actuating ring 20-4 to rotate, and then drives the blade 20-2 to open and close.

[0049] The driving form and process requirements of the adjustable die mechanism of the present invention include the following two schemes:

[0050] Scheme 1: Drive the driving handle 20-6 of the adjustable die mechanism 20 to rotate through a toggle mechanism, so as to drive the blade to open and close, realizing the adjustment of the blanking amount; the die opening is adjusted to decrease first, then increase, and then decrease, ensuring that the starting opening and the ending opening of the die are the same, so that the melt blank 29 can smoothly pass through the inserts with upper and lower openings, compensating for the influence of gravity on the blanking amount, making the material match with the bottle mouth insert, and preparing for subsequent processes such as blowing and mold opening and closing.

[0051] Scheme 2: Drive the driving handle 20-6 of the adjustable die mechanism 20 to rotate through a gear-rack mechanism, so as to drive the blade to open and close, realizing the adjustment of the blanking amount; the die opening is adjusted to decrease first, then increase, and then decrease, ensuring that the starting opening and the ending opening of the die are the same, so that the melt blank 29 can smoothly pass through the inserts with upper and lower openings, compensating for the influence of gravity on the blanking amount, making the material match with the bottle mouth insert, and preparing for subsequent processes such as blowing and mold opening and closing.

[0052] One end of the clamping device 18 according to the present invention is connected to the suspension platform and is driven by a gear-rack mechanism; a mechanical claw is provided at one end, and the opening and closing of the mechanical claw is used for clamping molten materials; the clamping device can linearly move in the vertical and horizontal directions; during the working process of the clamping device, there is no interference with the cooperation of each mechanism.

[0053] A manufacturing method of a plastic inner liner of a type-IV hydrogen storage bottle with double-headed inserts for a type-IV hydrogen storage bottle plastic inner liner blow molding equipment according to the present invention includes the following steps:

[0054] Step 1: Check the working conditions of the components, first install the insert 30 of the inner liner on the bottom fixed jaw platform 14, and fix it with the mechanical claw hand 12;

[0055] Step 2: Connect the gas path channel; add materials, and control the operation console 9 to turn on the heating system to heat the molten materials;

[0056] Step 3: Control the opening degree of the adjustable die mechanism 20, adjust the die opening to first decrease, then increase, and then decrease, to ensure that the melt preform 29 smoothly passes through the inserts with upper and lower openings;

[0057] Step 4: After the materials pass through the bottom insert 30 and reach the specified position, operate the clamping device 18-1 to clamp the melt preform 29; operate the shear knife 19 to cut off the melt preform 29;

[0058] Step 5: Operate the robotic arm to clamp the insert and move it above the clamping device 18-1, switch the clamping device 18-2 to extend into the insert through-hole from above to clamp the melt preform 29, and the robotic arm 21 moves downward to drive the insert to move to the specified position and cooperate with the mold;

[0059] Step 6: Control the moving template 17 to move along the linear guide rail towards the fixed template 11 to close the mold to complete the mold closing action;

[0060] Step 7: Open the blow air pipeline and inject air into the mold through the lower blow air pipe 15 to blow up the materials and make them close to the inner wall of the mold to form a hollow product;

[0061] Step 8: Control the operation console 9 to start the cooling system to cool the whole mold; after the mold is cooled, open the mold, and clamp the formed inner liner product with the robotic arm 21 and take it off.

Claims

1. A blow molding equipment for plastic liner of type IV hydrogen storage bottle, characterized by: It includes the following parts and structures: hydraulic cylinder, storage cylinder, heating ring, hopper, upper platform, molten iron, hanging platform, chassis, control console, forming mold a, fixed mold plate, mechanical claw, linear guide, fixed claw platform, blowing pipe, forming mold b, movable mold plate, clamping device, shear knife, gear mechanism, elbow mechanism, adjustable die mechanism, mechanical arm and discharge pipe. The base platform is fixedly connected to the ground, and the linear guide is fixedly welded to the base platform to ensure the linear movement of the movable mold plate on the linear guide; the movable mold plate is slidably connected to the linear guide, the fixed mold plate is fixedly connected to the linear guide, and a limiting device is arranged on the linear guide to ensure the sliding limit distance of the movable mold plate; the forming mold a and the forming mold b are respectively fixed to the movable template and the fixed template, and the molding mold moves linearly along the linear guide rail following the movable template; the fixed claw platform is fixedly connected to the middle position of the linear guide rail by welding, and is kept on the same central axis with the discharge pipe to ensure coaxiality; the mechanical claw hand is connected to the fixed claw platform by a pin shaft, and the mechanical claw hand can rotate around the pin shaft. The mechanical claw hand is used to grab the metal insert of the bottle mouth, and cooperate with the molding mold to complete the blow molding process of the plastic liner of the IV type hydrogen storage bottle with the metal insert; the chassis and the base platform are fixedly connected, and the console is fixedly connected to the chassis and the bottom platform, and the molding process of the blow molding process of the plastic liner of the IV type hydrogen storage bottle is controlled by the console; the upper platform and the chassis are fixedly connected by a connecting block, and the process During operation, the upper heating ring, storage cylinder, chassis and control console are isolated to improve operational safety; the hopper and storage cylinder are fixedly connected, and material is added through the hopper; the heating rings are arranged on the storage cylinder at equal intervals, and each heating ring is fixedly connected to the storage cylinder as an independent component, and the heating ring can convert the material into a molten state; the hydraulic cylinder is fixedly connected to the top of the discharge pipe by bolts and flanges, and the annular molten iron is fixedly connected to the outside of the discharge pipe, and the raw material is directly heated and temperature-controlled to improve extrusion efficiency. The hydraulic cylinder, discharge pipe and molten iron are arranged vertically; the adjustable die mechanism is connected to the discharge pipe by bolts, and the opening size of the die is adjusted as needed to adapt to the diameter or shape of different products, thereby improving production Efficiency; the shearing knife is connected to the hanging platform extending from the upper platform, and the shearing knife is driven to open and close by the gear rack mechanism to realize the cutting operation of the molten material; the clamping device is connected to the hanging platform, and the clamping device is driven to move in the vertical and horizontal directions by the gear rack mechanism to realize the clamping and fixing of the melt embryo; the mechanical arm is connected to the base platform by bolts and flanges, and the insert is clamped by the mechanical arm to stay above the mold to realize the integrated molding of the insert and the cylinder; the blowing pipe is arranged in the middle of the fixed claw platform, connected to the external air source, and air is blown into the mold through the blowing pipe, and the blow molding pressure is applied to make the molten plastic material inflate and close to the inner wall of the mold, thereby forming the desired hollow product.

2. A blow molding equipment for the plastic liner of a type IV hydrogen storage bottle according to claim 1, characterized in that: The adjustable die mechanism includes a base, blades, elastic washers, blade actuating rings, a cover plate and a driving handle, wherein: the base of the adjustable die mechanism is provided with an axial threaded through hole, which is connected to the discharge port by bolts; the base of the adjustable die mechanism is provided with an annular groove, and the length of the groove is the stroke length of the driving handle; the base of the adjustable die mechanism is provided with a radial threaded through hole, which is connected to the cover plate by studs.

3. A blow molding equipment for the plastic liner of a type IV hydrogen storage bottle according to claim 2, characterized in that: The blade of the adjustable die mechanism is a fully chamfered annular metal sheet structure, and single metal guide pillars are distributed above and below at both ends of the blade, and the diameter of the metal guide pillars is smaller than the annular length of the blade.

4. A blow molding equipment for a plastic liner of a type IV hydrogen storage bottle according to claim 2, characterized in that: The elastic washer is a semi-open spring washer, which provides additional friction to maintain the relative position of the cover plate and the base, thereby improving the stability and reliability of the connection.

5. A blow molding equipment for the plastic liner of a type IV hydrogen storage bottle according to claim 2, characterized in that: The blade actuating ring of the adjustable die mechanism is provided with radial grooves, which are circumferentially distributed with equal spacing; the circumferential length of the grooves is consistent with the size of the blade metal guide column; the blade actuating ring of the adjustable die mechanism is radially provided with a single threaded through hole, which is connected to the driving handle.

6. A blow molding equipment for a plastic liner of a type IV hydrogen storage bottle according to claim 2, characterized in that: A through hole is provided on the top of the cover plate, which is connected to the metal guide column of the blade; an annular rectangular groove is provided on the side, and the length of the groove is the stroke length of the driving handle; the cylindrical surface of the outer contour of the cover plate is in close contact with the inner cylindrical surface of the base, and is connected by threaded holes and studs that penetrate the base and the cover plate; an annular groove is provided at the bottom of the cover plate to accommodate an elastic gasket, and the elastic gasket and the annular groove are arranged in combination at the bottom of the base.

7. A blow molding equipment for a plastic liner of a type IV hydrogen storage bottle according to claim 2, characterized in that: The driving handle is an L-shaped structure with an external thread at the tail, and is fastened to the blade actuating ring through a thread; under the action of the outside world, the driving handle rotates to drive the blade actuating ring to rotate, thereby driving the blade to open and close.

8. A blow molding process for a plastic liner of a type IV hydrogen storage bottle, characterized in that: Using the blow molding equipment for the plastic liner of a type IV hydrogen storage bottle as described in claim 1, first check the working condition of the equipment; first install the insert of the liner on the fixed claw platform and fix it with a mechanical claw; connect the air path; add materials, control the operating table to turn on the heating system to heat the molten material; the molten material enters the discharge pipe through the storage cylinder; apply pressure through the hydraulic cylinder to extrude the material from the die; during the extrusion process, the opening size of the die mechanism can be adjusted by controlling the operating table, and the die opening is adjusted to first decrease, then increase, and then decrease, to ensure that the starting opening and the ending opening of the die are consistent, to ensure that the material passes through the insert with the upper and lower openings smoothly, to compensate for the influence of gravity on the amount of material falling so that the material and the bottle mouth insert cooperate, for the blowing process. Make preparations; after the material passes through the bottom insert and reaches the specified position, operate the clamping device to clamp the melt embryo; operate the shearing knife to cut the melt embryo; operate the mechanical arm to clamp the insert and move it above the shearing knife, and extend the clamping device into the through hole of the insert to clamp the raw material to maintain the shape and position of the material; the mechanical arm moves downward to drive the insert to move to the specified position and cooperate with the mold; the control console drives the mold clamping system to work, and the movable template moves toward the fixed template along the linear guide rail, and the mold closes to complete the mold clamping action; inject air into the mold through the lower air blowing pipe to blow up the material and make it close to the inner wall of the mold to form a hollow product; control the operating console to start the cooling system to cool the entire mold; after the mold is cooled, open the mold, and use the mechanical arm to clamp the formed liner product and remove it.

9. A blow molding process for a plastic liner of a type IV hydrogen storage bottle according to claim 8, characterized in that: The robot arm operation steps are omitted. After the insert is installed on the fixed claw platform, the control console extrudes the molten material through the adjustable die mechanism. The die opening is adjusted to first decrease, then increase, and then decrease again to ensure that the starting and ending openings of the die are consistent, ensuring that the material can smoothly pass through the insert with upper and lower openings. The desired product can be obtained through subsequent processes such as mold closing, cooling, and mold opening.

10. A blow molding process for a plastic liner of a type IV hydrogen storage bottle according to claim 8, characterized in that: The adjustable die mechanism driving handle is driven to rotate by a toggle mechanism, thereby driving the blades to open and close, thereby adjusting the amount of material falling; or the adjustable die mechanism driving handle is driven to rotate by a gear rack mechanism.

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