One-time extrusion and drawing molding equipment and molding method for large-scale IV type hydrogen storage bottle liner

Abstract

The present application relates to a large IV type hydrogen storage bottle liner extrusion and drawing one-time forming equipment and forming method, the forming equipment includes extruder, extrusion die, several forming dies, the extrusion die is installed on the head of the extruder, each forming die is installed on the side of the extruder, wherein, a forming die is the liner front head forming die, another forming die is the liner rear head forming die, the remaining forming dies are the liner body forming dies;The forming method is that the liner is formed by the above forming equipment one-time. The large IV type hydrogen storage bottle liner is a whole, the wall thickness is uniform;On the basis of traditional pipe material drawing technology, the method of blowing is used to realize the forming of the liner, at the same time, considering that the tubular melt is too long in one-time stretching, under its own weight, the middle part will droop and affect the blowing effect, the design of multiple forming dies is adopted, the blowing of the liner front head, the body and the rear head is segmented, and the tubular melt is stretched only a small section in one-time.

Description

Technical Field

[0001] The present 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 simple, easy-to-produce, one-step process of injection molding, blow molding, and rotational molding for producing Type IV hydrogen storage tank liners is already in use in numerous family cars and minivans. With the rapid development of the hydrogen energy industry, large and extra-large hydrogen storage tanks are becoming increasingly necessary for hydrogen transport vehicles, hydrogen engineering vehicles, hydrogen-powered ships, and hydrogen-powered high-speed rail. However, the drawback of these three methods is that they cannot be scaled up. When molding large Type IV hydrogen storage tank liners, they cannot guarantee uniform wall thickness.

[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 adopted. Although it is feasible, it requires large investment, complicated process and low pass rate. Summary of the Invention

[0004] The present invention proposes a one-time pultrusion molding device and molding method for the liner of a large-scale IV hydrogen storage bottle, aiming to realize the manufacture of the liner of a large-scale IV hydrogen storage bottle. The manufactured large-scale IV hydrogen storage bottle liner is an integral whole with uniform wall thickness. It improves on the basis of traditional pipe pultrusion technology and adopts a blow molding method to realize the molding of the liner. At the same time, considering that the tubular melt 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 to blow mold the front head, liner body and rear head of the liner in sections, and the tubular melt is only stretched a small section at a time.

[0005] The technical solution of the present invention:

[0006] 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 several molding dies, the extrusion die being mounted on the extruder head, and the molding dies being mounted 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 liner body;

[0007] The forming method,

[0008] 1) The extruder works, and a tubular molten body is extruded from the extrusion die;

[0009] 2) At the exit of the extrusion die, the liner front head forming mold is closed to clamp the tubular molten body. The tubular molten body is placed in the liner front head forming mold, and the liner front head forming mold moves forward. The tubular molten body moves forward under the traction of the liner front head forming mold, inflating the tubular molten body and / or forming a negative pressure in the liner front head forming mold, so that the tubular molten body is adsorbed on the inner wall of the liner front head forming mold; the tubular molten body adsorbed on the inner wall of the liner front head forming mold cools to form the liner front head;

[0010] 3) On the rear side of the previous molding die, the bladder body molding die is closed and combined with the previous molding die, and a tubular melt is placed in the bladder body molding die. The bladder body molding die and the bladder front head molding die move forward synchronously. The tubular melt moves forward under the traction of the bladder front head molding die, inflating the tubular melt and / or forming a negative pressure in the bladder body molding die, so that the tubular melt is adsorbed on the inner wall of the bladder body molding die; the tubular melt adsorbed on the inner wall of the bladder body molding die cools to form the bladder body;

[0011] 4) Repeat step 3) n times;

[0012] 5) On the rear side of the previous forming mold, the liner rear end head forming mold is closed and combined with the previous forming mold. The tubular molten body is placed in the liner rear end head forming mold, and the tubular molten body is inflated and / or negative pressure is formed in the liner body forming mold, so that the tubular molten body is adsorbed on the inner wall of the liner body forming mold; the tubular molten body adsorbed on the inner wall of the liner rear end head forming mold is cooled to form the liner rear end head;

[0013] The one-time molding of an inner liner is completed.

[0014] In step 5), the liner rear end head forming mold is closed and combined with the previous forming mold to clamp the tubular molten body. After the liner rear end head forming mold clamps the tubular molten body, the liner front end head forming mold is opened and the liner front end head is released.

[0015] 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.

[0016] An air blowing pipe is installed in the head of the extruder;

[0017] When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure.

[0018] The forming die is provided with an air extraction hole;

[0019] Air is extracted from the exhaust holes to form negative pressure in the molding die.

[0020] The extruder head is a side-feed type, with a through hole in the center thereof, which is connected to the center hole on the extrusion die to form a channel. The molding device also includes a gripper, which is installed on the side of the extruder;

[0021] In step 1), when the liner front head forming mold is closed, the gripper grabs the valve, places the valve in the liner front head forming 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.

[0022] In step 4), after the tubular molten body adsorbed on the inner wall of the bladder body forming mold is cooled to form the bladder body, the bladder body forming mold is opened and reset for recycling, thereby reducing the number of bladder body forming molds required.

[0023] 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.

[0024] An air blowing pipe is combined with the gripper and passes through or out of the passage together with the gripper;

[0025] When the tubular molten body is inflated, the blowing pipe outputs gas at a constant pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a one-time extrusion and drawing molding device for large-scale IV-type hydrogen storage bottle liners.

[0027] Figure 2 This is a schematic diagram of a one-time extrusion and drawing molding method for the inner liner of a large IV type hydrogen storage bottle.

[0028] In the figure, there are an extruder 1, a die head 1-1, an extrusion die 2, a liner front head forming die 3, a liner rear head forming die 4, a liner body forming die 5, a channel 6, a gripper 7, an air blowing pipe 8, a tubular melt 9, and a valve 10. DETAILED DESCRIPTION

[0029] Large IV type hydrogen storage bottle liner extrusion and pulling one-time molding equipment and molding method,

[0030] like Figure 1As shown, the molding equipment includes an extruder 1, an extrusion die 2, and several molding dies, the extrusion die 2 is installed on the head 1-1 of the extruder, and each molding die is installed on the side of the extruder 1, wherein one molding die is a front end molding die 3 for the liner, another molding die is a rear end molding die 4 for the liner, and the remaining molding die are liner body molding dies 5; the head 1-1 of the extruder is a side-feed type, and a through hole is provided in the center thereof, and the through hole is connected with the center hole on the extrusion die 2 to form a channel 6, the molding equipment also includes a gripper 7, the gripper 7 is installed on the side of the extruder 1, and passes through or out of the channel; the blowing pipe 8 is combined with the gripper 7, and passes through or out of the channel 6 together with the gripper 7; the molding die is provided with an exhaust hole; the molding die has a built-in cooling device;

[0031] like Figure 2 As shown, the molding method,

[0032] The extruder 1 is in operation, and a tubular molten body 9 is extruded from the extrusion die 2;

[0033] 2) At the outlet of the extrusion die 2, the liner front head forming mold 3 is closed to clamp the tubular molten body 9. When the liner front head forming mold 3 is closed, the gripper 7 grabs the valve 10 and places the valve in the liner front head forming mold 3 through the channel 6, and is wrapped by the tubular molten body 9 to complete the valve planting. The tubular molten body 9 is placed in the liner front head forming mold 3, and the liner front head forming mold 3 moves forward. The tubular molten body 9 moves forward under the traction of the liner front head forming mold 3, and the blowing pipe 8 retreats into the channel 6 with the gripper 7, outputs gas of constant pressure in the channel 6, inflates the tubular molten body 9, and at the same time, exhausts air through the exhaust hole on the liner front head forming mold 3 to form a negative pressure in the liner front head forming mold 3, so that the tubular molten body 9 is adsorbed on the inner wall of the liner front head forming mold 3; the tubular molten body 9 adsorbed on the inner wall of the liner front head forming mold 3 cools to form the liner front head;

[0034] 3) On the rear side of the previous molding die, the bladder body molding die 5 is combined with the previous molding die, and a tubular molten body 9 is placed in the bladder body molding die 5. The bladder body molding die 3 and the bladder front end molding die 5 move forward synchronously. The tubular molten body 9 moves forward under the traction of the bladder front end molding die 3. The 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 extracted through the exhaust holes on the bladder body molding die 5 to form a negative pressure in the bladder body molding die 5, so that the tubular molten body 9 is adsorbed on the inner wall of the bladder body molding die 5; the tubular molten body 9 adsorbed on the inner wall of the bladder body molding die 5 is cooled to form an bladder body;

[0035] 4) Repeat step 3) n times; during this process, after the tubular melt 9 adsorbed on the inner wall of the inner bladder body forming mold 5 cools to form the inner bladder body, the inner bladder body forming mold 4 is opened and reset for recycling;

[0036] 5) On the rear side of the previous forming mold, the liner rear end head forming mold 5 is combined with the previous forming mold to clamp the tubular molten body 9. The tubular molten body 9 is placed in the liner rear end head forming mold 4. Air is extracted through the exhaust holes on the liner rear end head forming mold 4 to form a negative pressure in the liner body forming mold 5, so that the tubular molten body 9 is adsorbed on the inner wall of the liner rear end head forming mold 4. The tubular molten body 9 adsorbed on the inner wall of the liner rear end head forming mold 4 is cooled to form the liner rear end head;

[0037] Complete one-time molding of an inner liner;

[0038] After the liner rear end molding die 4 clamps the tubular molten body 9, the liner front end molding die 3 is opened and reset, and the liner front end is released; the liner body molding die 5 and the liner rear end molding die 4 move forward synchronously, and the liner rear end molding die 4 pulls the tubular molten body 9 forward, and repeats steps 1)-5) to complete the one-time molding of the next liner.

[0039] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

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

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

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

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

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

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

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

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