Large IV-type hydrogen storage cylinder liner pultrusion one-time molding equipment and molding method

Abstract

The invention relates to a large IV type hydrogen storage cylinder liner pultrusion one-time forming device and method, the forming device comprises an extruder, an extrusion die and a plurality of forming dies, the extrusion die is installed on a machine head of the extruder, each forming die is installed on the side of the extruder, one forming die is an inner container front sealing head forming die, the other forming die is an inner container rear sealing head forming die, and the other forming dies are inner container body forming dies; according to the forming method, the inner container is formed at a time by adopting the forming equipment. The manufactured large IV-type hydrogen storage bottle liner is an integral body and is uniform in wall thickness; a traditional pipe pultrusion technology is improved, an inner container is formed through a blow molding method, meanwhile, in consideration of the situation that the blow molding effect is affected due to the fact that a tubular molten mass is too long in one-time stretching and the middle of the tubular molten mass can droop under the dead weight of the tubular molten mass, the design of multiple forming dies is adopted, and blow molding is carried out on a front end socket, a container body and a rear end socket of the inner container in a segmented mode; and the tubular molten mass is only stretched into a small section at a time.

Description

Technical Field

[0001] The invention relates to a plastic product molding technology, and in particular to a large IV type hydrogen storage bottle liner extrusion and drawing one-time molding equipment and a molding method. Background Art

[0002] The injection molding, blow molding, and rotational molding one-step molding method produces the inner liner of the type IV hydrogen storage bottle. The process is simple and the production is convenient. It has been used in many household cars and micro cars. With the rapid development of the hydrogen energy industry, large and super-large hydrogen storage bottles for hydrogen transport vehicles, hydrogen engineering vehicles, hydrogen-powered ships, and hydrogen-powered high-speed railways are also imperative. The disadvantage of the above three methods is that they cannot be made larger. When molding the inner liner of a large type IV hydrogen storage bottle, it is impossible to ensure that the wall thickness of the inner liner of the large type IV hydrogen storage bottle is uniform.

[0003] For large-scale IV type hydrogen storage bottles, the three-step method of extruding the barrel body + injection molding the head + welding is currently used. Although it is feasible, it requires large investment, complex process and low pass rate. Summary of the invention

[0004] The present invention proposes a one-time extrusion and drawing molding device and a molding method for a large-scale IV-type hydrogen storage bottle liner, aiming to realize the manufacture of a large-scale IV-type hydrogen storage bottle liner. The manufactured large-scale IV-type hydrogen storage bottle liner is an integral whole with uniform wall thickness. It is improved on the basis of traditional pipe pultrusion technology, and a blow molding method is adopted to realize the molding of the liner. At the same time, considering that a tubular molten body is stretched too long at one time, the middle part will sag under its own weight, affecting the blow molding effect, a multi-molding mold design is adopted, and the front head, the liner body, and the rear head of the liner are blow-molded in sections, and the tubular molten body is only stretched a small section at a time.

[0005] The technical solution of the present invention: A one-time extrusion and drawing molding device and molding method for a large IV-type hydrogen storage bottle liner, the molding device comprising an extruder, an extrusion die, and a plurality of molding dies, the extrusion die being mounted on the head of the extruder, and each molding die being mounted on the side of the extruder, wherein one molding die is a liner front end molding die, another molding die is a liner rear end molding die, and the remaining molding dies are liner body molding dies; The molding method, 1) The extruder works, and a tubular molten body is extruded from the extrusion die; 2) At the exit of the extrusion die, the liner front end head forming die is closed to clamp the tubular molten body, and the tubular molten body is placed in the liner front end head forming die. The liner front end head forming die moves forward, and the tubular molten body moves forward under the traction of the liner front end head forming die, inflating the tubular molten body and / or forming a negative pressure in the liner front end head forming die, so that the tubular molten body is adsorbed on the inner wall of the liner front end head forming die; the tubular molten body adsorbed on the inner wall of the liner front end head forming die is cooled to form the liner front end head; 3) At the rear side of the previous molding die, the liner body molding die is closed and combined with the previous molding die, and the tubular melt is placed in the liner body molding die. The liner body molding die and the liner front end head molding die move forward synchronously. The tubular melt moves forward under the traction of the liner front end head molding die, and the tubular melt is inflated and / or negative pressure is formed in the liner body molding die, so that the tubular melt is adsorbed on the inner wall of the liner body molding die; the tubular melt adsorbed on the inner wall of the liner body molding die is cooled to form the liner body; 4) Repeat step 3) n times; 5) On the rear side of the previous molding die, the liner rear end head molding die is closed and combined with the previous molding die, and the tubular molten body is placed in the liner rear end head molding die, and the tubular molten body is inflated and / or negative pressure is formed in the liner body molding die, so that the tubular molten body is adsorbed on the inner wall of the liner body molding die; the tubular molten body adsorbed on the inner wall of the liner rear end head molding die is cooled to form the liner rear end head; The one-time molding of an inner liner is completed.

[0006] In step 5), when the liner rear end-end forming mold is closed and combined with the previous forming mold, the tubular molten body is clamped. After the liner rear end-end forming mold clamps the tubular molten body, the liner front end-end forming mold is opened and the liner front end-end is released; The liner body forming mold and the liner rear end forming mold move forward synchronously, and the liner rear end forming mold pulls the tubular molten body forward, and steps 1)-5) are repeated to complete the one-time forming of the next liner.

[0007] An air blowing pipe is installed in the head of the extruder; When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure.

[0008] The forming die is provided with an air extraction hole; Air is sucked out from the exhaust holes to form negative pressure in the molding die.

[0009] The head of the extruder is of side-feed type, and a through hole is arranged at the center thereof, and the through hole is connected with the center hole on the extrusion die to form a channel. The molding device also includes a gripper, and the gripper is installed on the side of the extruder; In step 1), when the liner front end head molding mold is closed, the gripper grabs the valve, and places the valve in the liner front end head molding mold through the channel, and wraps the valve with the tubular molten body to complete the valve planting; the valve and the liner are tightly combined.

[0010] In step 4), after the tubular molten body adsorbed on the inner wall of the liner body forming mold is cooled to form the liner body, the liner body forming mold is opened and reset for recycling, thereby reducing the number of liner body forming molds required.

[0011] The molding die has a built-in cooling device to accelerate the cooling of the tubular molten body adsorbed on the inner wall of the molding die. Preferably, a cooling water flow channel is constructed in the molding die, and cooling water circulates therein.

[0012] An air blowing pipe is combined with the gripper and passes into or out of the passage together with the gripper; When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a one-time extrusion and drawing molding equipment for large-scale IV-type hydrogen storage bottle liners.

[0014] Figure 2 It is a schematic diagram of a one-time extrusion and drawing method for the inner liner of a large IV type hydrogen storage bottle.

[0015] In the figure, there are an extruder 1, a die head 1-1, an extrusion die 2, a liner front end molding die 3, a liner rear end molding die 4, a liner body molding die 5, a channel 6, a gripper 7, an air blowing pipe 8, a tubular melt 9, and a valve 10. DETAILED DESCRIPTION

[0016] One-time extrusion and drawing molding equipment and molding method for large IV type hydrogen storage bottle liner, like Figure 1 As shown, the molding equipment includes an extruder 1, an extrusion die 2, and a plurality of molding dies, wherein the extrusion die 2 is mounted on the head 1-1 of the extruder, and each molding die is mounted on the side of the extruder 1, wherein one molding die is a front end molding die 3 for an inner liner, another molding die is a rear end molding die 4 for an inner liner, and the remaining molding die is an inner liner body molding die 5; the head 1-1 of the extruder is a side-feeding type, and a through hole is arranged at the center thereof, and the through hole is connected with the center hole on the extrusion die 2 to form a channel 6, and the molding equipment also includes a gripper 7, and the gripper 7 is mounted on the side of the extruder 1, and penetrates into or out of the channel; an air blow pipe 8 is combined with the gripper 7, and penetrates into or out of the channel 6 together with the gripper 7; an air extraction hole is arranged on the molding die; and a cooling device is built into the molding die; like Figure 2 As shown, the molding method, The extruder 1 is in operation, and a tubular molten body 9 is extruded from the extrusion die 2; 2) At the exit of the extrusion die 2, the liner front end-end molding die 3 is closed to clamp the tubular molten body 9. When the liner front end-end molding die 3 is closed, the gripper 7 grabs the valve 10 and places the valve in the liner front end-end molding die 3 through the channel 6, and the valve is wrapped by the tubular molten body 9 to complete the valve planting. The tubular molten body 9 is placed in the liner front end-end molding die 3, and the liner front end-end molding die 3 moves forward. The tubular molten body 9 moves forward under the traction of the liner front end-end molding die 3, and the blowing pipe 8 retreats into the channel 6 with the gripper 7, and outputs gas of constant pressure in the channel 6 to inflate the tubular molten body 9. At the same time, air is exhausted through the exhaust hole on the liner front end-end molding die 3 to form a negative pressure in the liner front end-end molding die 3, so that the tubular molten body 9 is adsorbed on the inner wall of the liner front end-end molding die 3; the tubular molten body 9 adsorbed on the inner wall of the liner front end-end molding die 3 is cooled to form the liner front end; 3) On the rear side of the previous molding die, the liner body molding die 5 is combined with the previous molding die, and the tubular molten body 9 is placed in the liner body molding die 5. The liner body molding die 3 and the liner front end head molding die 5 move forward synchronously. The tubular molten body 9 moves forward under the traction of the liner front end head molding die 3, and the gas blowing pipe 8 in the channel 6 outputs gas at a constant pressure to inflate the tubular molten body 9. At the same time, air is exhausted through the exhaust holes on the liner body molding die 5 to form a negative pressure in the liner body molding die 5, so that the tubular molten body 9 is adsorbed on the inner wall of the liner body molding die 5; the tubular molten body 9 adsorbed on the inner wall of the liner body molding die 5 is cooled to form the liner body; 4) Repeat step 3) n times; during this process, after the tubular melt 9 adsorbed on the inner wall of the inner liner body forming mold 5 cools to form an inner liner body, the inner liner body forming mold 4 is opened and reset for recycling; 5) On the rear side of the previous molding die, the liner rear end head molding clamping die 5 is combined with the previous molding die to clamp the tubular molten body 9, which is placed in the liner rear end head molding die 4. Air is extracted through the exhaust holes on the liner rear end head molding die 4 to form a negative pressure in the liner body molding die 5, so that the tubular molten body 9 is adsorbed on the inner wall of the liner rear end head molding die 4. The tubular molten body 9 adsorbed on the inner wall of the liner rear end head molding die 4 is cooled to form the liner rear end head; Complete one-time molding of an inner liner; After the liner rear end cap molding die 4 clamps the tubular molten body 9, the liner front end cap molding die 3 is opened and reset, and the liner front end cap is released; the liner body molding die 5 and the liner rear end cap molding die 4 move forward synchronously, and the liner rear end cap molding die 4 pulls the tubular molten body 9 forward, and steps 1)-5) are repeated to complete the one-time molding of the next liner.

[0017] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A one-time extrusion and drawing molding equipment and molding method for a large IV type hydrogen storage bottle liner, characterized in that: The molding equipment includes an extruder, an extrusion die, and a plurality of molding dies, wherein the extrusion die is installed on the head of the extruder, and each molding die is installed on the side of the extruder, wherein one molding die is a molding die for the front end of the liner, another molding die is a molding die for the rear end of the liner, and the remaining molding dies are molding dies for the body of the liner; The molding method, 1) The extruder works, and a tubular molten body is extruded from the extrusion die; 2) At the exit of the extrusion die, the liner front end head forming die is closed to clamp the tubular molten body, and the tubular molten body is placed in the liner front end head forming die. The liner front end head forming die moves forward, and the tubular molten body moves forward under the traction of the liner front end head forming die, inflating the tubular molten body and / or forming a negative pressure in the liner front end head forming die, so that the tubular molten body is adsorbed on the inner wall of the liner front end head forming die; the tubular molten body adsorbed on the inner wall of the liner front end head forming die is cooled to form the liner front end head; 3) At the rear side of the previous molding die, the liner body molding die is closed and combined with the previous molding die, and the tubular melt is placed in the liner body molding die. The liner body molding die and the liner front end head molding die move forward synchronously. The tubular melt moves forward under the traction of the liner front end head molding die, and the tubular melt is inflated and / or negative pressure is formed in the liner body molding die, so that the tubular melt is adsorbed on the inner wall of the liner body molding die; the tubular melt adsorbed on the inner wall of the liner body molding die is cooled to form the liner body; 4) Repeat step 3) n times; 5) On the rear side of the previous molding die, the liner rear end head molding die is closed and combined with the previous molding die, and the tubular molten body is placed in the liner rear end head molding die, and the tubular molten body is inflated and / or negative pressure is formed in the liner body molding die, so that the tubular molten body is adsorbed on the inner wall of the liner body molding die; the tubular molten body adsorbed on the inner wall of the liner rear end head molding die is cooled to form the liner rear end head; The one-time molding of an inner liner is completed.

2. The one-time extrusion and drawing molding equipment and molding method for the large-scale IV-type hydrogen storage bottle liner according to claim 1 is characterized in that: In step 5), when the liner rear end-end forming mold is closed and combined with the previous forming mold, the tubular molten body is clamped. After the liner rear end-end forming mold clamps the tubular molten body, the liner front end-end forming mold is opened and the liner front end-end is released; After step 5), the liner body forming mold and the liner rear end forming mold move forward synchronously, and the liner rear end forming mold pulls the tubular molten body forward, and steps 1)-5) are repeated to complete the one-time forming of the next liner.

3. The one-time extrusion and drawing molding equipment and molding method for the large-scale IV-type hydrogen storage bottle liner according to claim 1 is characterized in that: An air blowing pipe is installed in the head of the extruder; When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure.

4. The one-time extrusion and drawing molding equipment and molding method for the large IV type hydrogen storage bottle liner according to claim 1 is characterized in that: The forming die is provided with an air extraction hole; Air is sucked out from the exhaust holes to form negative pressure in the molding die.

5. The one-time extrusion and drawing molding equipment and molding method for the large IV type hydrogen storage bottle liner according to claim 1 is characterized in that: The head of the extruder is of side-feed type, with a through hole at its center, the through hole is connected to the center hole on the extrusion die to form a channel, and the molding device also includes a gripper, which is installed on the side of the extruder and passes into or out of the channel; In step 1), when the liner front head molding mold is closed, the gripper grabs the valve, which is inserted through the channel, and the valve is placed in the liner front head molding mold and wrapped by the tubular molten body to complete the valve planting.

6. The one-time extrusion and drawing molding equipment and molding method for the large-scale IV-type hydrogen storage bottle liner according to claim 1 is characterized in that: In step 4), after the tubular molten body adsorbed on the inner wall of the liner body forming mold is cooled to form the liner body, the liner body forming mold is opened and reset for recycling.

7. The one-time extrusion and drawing molding equipment and molding method for the large-scale IV-type hydrogen storage bottle liner according to claim 1 is characterized in that: The molding die has a built-in cooling device.

8. The one-time extrusion and drawing molding equipment and molding method for the large-scale IV-type hydrogen storage bottle liner according to claim 5 is characterized in that: A blow pipe is combined with a gripper, and passes through or out of the channel together with the gripper, and extends out of a central hole on the extrusion die or retracts; When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure.

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