Gas storage cylinder, end socket protection cover and manufacturing method of end socket protection cover

Abstract

The invention discloses a gas storage cylinder, an end socket protection cover and a manufacturing method of the end socket protection cover, and relates to the technical field of high-pressure gas storage cylinders. The manufacturing method of the end socket protection cover comprises the following steps: injecting a target glue injection amount of plastic melt into a cavity of an injection mold; a blowing needle is driven to conduct blowing treatment on the plastic melt in the cavity, so that a cover body of a hollow structure is manufactured; within a first preset time, continuously blowing air to the cover body in the cavity; and within the second preset time, the cover body is cooled, overflowing materials on the cover body are punctured to exhaust gas, and the end socket protection cover is manufactured. According to the invention, the end socket protection cover structure of the high-pressure gas cylinder and the injection molding method are improved, the energy absorption of the gas cylinder in the collision process is ensured, the weight of the end socket protection cover is reduced, and the gas storage density of the gas cylinder per unit mass is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure gas cylinders, and in particular to a gas cylinder, a head protection cover and a manufacturing method thereof. Background Art

[0002] The existing head protection cover for high-pressure gas storage cylinders includes a cover body, which is arranged at the end of the high-pressure hydrogen storage cylinder. The inner wall of the cover body is in contact with the outer wall of the end of the high-pressure hydrogen storage cylinder. An opening is provided in the middle of the cover body for extending the cylinder valve.

[0003] However, the cushioning protection effect of this conventional head protection cover is poor, and the gas cylinder will still suffer certain damage when it is hit during transportation and use; and with the development of the gas storage and transportation industry, the demand for lightweight gas cylinders is getting higher and higher, and the weight of the head protection cover is also heavy. Summary of the Invention

[0004] The main purpose of the present invention is to provide a gas storage cylinder, a head protection cover and a manufacturing method thereof, aiming to improve the buffering protection effect of the head protection cover and reduce the weight of the head protection cover.

[0005] To achieve the above object, the present invention provides a method for manufacturing a head protection cover, the manufacturing method comprising the following steps:

[0006] Injecting a target shot amount of plastic melt into the cavity of the injection mold;

[0007] The blow needle is driven to blow air onto the plastic melt in the cavity to form a cover body with a hollow structure;

[0008] within a first preset time, continuously blowing air onto the cover body in the cavity;

[0009] Within a second preset time, the cover body is cooled, and the overflow on the cover body is punctured to discharge the gas, thereby forming a head protection cover.

[0010] Optionally, after the step of cooling the cover body and reducing the pressure in the cavity to a target pressure value within the second preset time to form the head protection cover, the method further includes:

[0011] Repair and remove the overflow and waste materials of the head protection cover.

[0012] Optionally, in the step of driving the blowing needle to blow the plastic melt in the cavity to form a cover body with a hollow structure, the gas introduced by the blowing needle is an inert gas.

[0013] Optionally, in the step of driving the blow needle to blow air onto the plastic melt in the cavity to form a cover body with a hollow structure, the pressure of the gas blown into the cavity by the blow needle is 5-35 MPa.

[0014] Optionally, in the step of continuously blowing air into the cover body in the cavity within the first preset time, the pressure of the gas blown into the cavity by the blow needle is 10-20 MPa.

[0015] Optionally, in the step of injecting a target shot volume of plastic melt into the cavity of the injection mold, the target shot volume is 75%-95% of the full shot volume of the mold.

[0016] Optionally, the inert gas is nitrogen.

[0017] To achieve the above-mentioned object, the present invention provides a head protection cover, which is manufactured using the above-mentioned head protection cover manufacturing method.

[0018] Optionally, the head protection cover includes a cover body, and a middle portion of the cover body is provided with an escape opening for allowing the valve of the gas cylinder to extend out.

[0019] To achieve the above object, the present invention further provides a gas storage cylinder comprising the above head protection cover.

[0020] In the technical solution of the present invention, the manufacturing method of the head protective cover includes the following steps: injecting a target shot volume of plastic melt into the cavity of an injection mold; driving a blow needle to blow air into the plastic melt in the cavity to form a hollow cover body; continuously blowing air into the cover body in the cavity for a first preset time; and cooling the cover body for a second preset time, puncturing the overflow on the cover body to expel gas, and forming the head protective cover. It can be understood that the present invention improves the structure and injection molding method of the head protective cover of a high-pressure gas cylinder. The head protective cover adopts a hollow structure, which ensures that the gas cylinder absorbs energy during a collision, while reducing the weight of the head protective cover and greatly improving the gas storage density per unit mass of the gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a schematic flow chart of an embodiment of a method for manufacturing a head protection cover according to the present invention;

[0023] Figure 2 This is a schematic structural diagram of the cover body at an angle in one embodiment of the head protection cover of the present invention;

[0024] Figure 3 This is a schematic structural diagram of the cover body in another angle in one embodiment of the head protection cover of the present invention;

[0025] Figure 4 This is a schematic structural diagram of a head protection cover after the cover body is cut away in one embodiment of the present invention.

[0026] Description of Figure Numbers:

[0027] 10. Cover body; 10a. Hollow structure; 10b. Avoidance opening.

[0028] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution in which both A and B are satisfied. The technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The invention provides a method for manufacturing a head protection cover.

[0034] Reference Figures 1 to 4 In one embodiment of the present invention, the method for manufacturing the head protection cover includes the following steps:

[0035] S10, injecting a target shot amount of plastic melt into the cavity of the injection mold;

[0036] S20, driving the blowing needle to blow the plastic melt in the cavity to form the cover body 10 with a hollow structure 10a;

[0037] S30, continuously blowing air into the cover body 10 in the cavity within a first preset time;

[0038] S40, within a second preset time, cooling the cover body 10, puncturing the overflow material on the cover body 10 to discharge the gas, and forming a head protection cover.

[0039] In this embodiment, the manufacturing process of the head protection cover is roughly divided into four stages, as follows:

[0040] The first stage is melt injection, where the injection molding machine injects a precisely measured amount of plastic melt into the mold cavity. The target shot size is 75%-95% of the full shot size. The cavity doesn't need to be completely filled at this stage, leaving space for subsequent gas injection.

[0041] The second stage is gas-assisted filling. During or after the injection molding process, a blow needle is driven into the mold cavity. A gas-assisted controller injects an inert gas, such as nitrogen, into the molten plastic. The gas pressure can reach up to 35 MPa. This pressure pushes the plastic melt to fill the entire cavity, simultaneously expanding the interior to form a hollow structure 10a. As the filling continues, excess melt flows out of the housing 10 through an overflow chute.

[0042] The third stage is the pressure holding and shaping stage, in which the blow needle is controlled to continuously inflate the mold cavity. The gas maintains a certain pressure after pushing the plastic melt to fill the mold cavity. During this process, the pressure of the gas in the hollow part of the finished product becomes the pressure holding pressure, which can greatly reduce the shrinkage and deformation rate of the finished product.

[0043] The fourth stage is the cooling and demoulding stage. After the cooling time is over, in order to prevent the product from bursting, the overflow part of the cover body 10 needs to be punctured to automatically discharge the gas inside the mold and reduce the pressure in the mold to atmospheric pressure. Finally, the mold is opened to take out the product.

[0044] It can be understood that the present invention improves the head protection cover structure and injection molding method of the high-pressure gas storage cylinder. The head protection cover adopts a hollow structure 10a, which ensures the energy absorption of the gas storage cylinder during the collision process, while reducing the weight of the head protection cover and greatly improving the gas storage density per unit mass of the gas cylinder.

[0045] Reference Figure 1 In one embodiment, within the second preset time, the cover body 10 is cooled and the pressure in the cavity is reduced to the target pressure value, and after step S40 of manufacturing the head protection cover, the method further includes:

[0046] S50. Repair and remove the overflow and waste materials of the head protection cover.

[0047] In this embodiment, in order to further improve product quality and aesthetics, after the molding cycle is completed, the product needs to be post-processed to remove overflow waste.

[0048] Reference Figure 1 In one embodiment, in step S20 of driving the blow needle to blow the plastic melt in the cavity to form the cover body 10 of the hollow structure 10a, the pressure of the gas blown into the cavity by the blow needle is 5-35 MPa.

[0049] Reference Figure 1 In one embodiment, during the first preset time, in step S30 of continuously blowing the cover body 10 in the cavity, the pressure of the gas blown into the cavity by the blow needle is 10-20 MPa.

[0050] In summary, the present invention has at least the following technical advantages:

[0051] (1) Improve product quality and eliminate surface sink marks: Traditional injection molded products are prone to forming sink marks in thick areas. However, the gas-assisted molding of the present invention can apply pressure through a hollow gas pipe, causing the product to shrink from the inside out. After curing, there will be no such sink marks on the appearance, which can effectively improve the surface quality of the head protective cover.

[0052] (2) Reduce warping and deformation: The hollow gas circulation structure formed in the gas-assisted molding of the present invention can effectively transmit pressure, reduce the stress in the product, and reduce the problem of warping of the finished product, so that the head protection cover can better fit with the head of the high-pressure gas storage cylinder, thereby playing a good protective role.

[0053] (3) Reduce production costs and save materials: The products produced by gas-assisted injection molding of the present invention save more materials than traditional injection molding. In addition to saving materials due to the internal hollowing, the gate material and quantity of the product are also greatly reduced, which can reduce the material cost of the head protection cover.

[0054] (4) Shortening the production cycle: Since the gas-assisted molded products of the present invention are hollow inside, the cooling time is shorter than that of traditional solid products. The total cycle time is shortened due to the reduction of pressure holding and cooling time, which improves production efficiency and reduces manpower and equipment costs in the production process.

[0055] (5) Extending the life of the mold: The present invention uses gas-assisted molding, and the injection pressure, injection holding pressure and clamping pressure are reduced at the same time. The pressure on the mold is also reduced accordingly, and the number of mold maintenance times is greatly reduced, thereby extending the service life of the mold and reducing the cost of mold replacement and maintenance.

[0056] The present invention provides a head protection cover, which is manufactured by adopting the above-mentioned manufacturing method of the head protection cover.

[0057] Reference Figures 2 to 4 In this embodiment, the head protection cover may include a cover body 10, and a middle portion of the cover body 10 is provided with an avoidance opening 10b for allowing the valve of the gas cylinder to extend out, so that it can better adapt to the head structure of a conventional gas cylinder to achieve better head protection effect.

[0058] The present invention also proposes a gas storage cylinder, which includes a head protection cover. The specific structure of the head protection cover refers to the above-mentioned embodiment. Since the gas storage cylinder proposed by the present invention includes all schemes of all embodiments of the above-mentioned head protection cover, it has at least the same technical effects as the above-mentioned head protection cover, which will not be elaborated here one by one.

[0059] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for manufacturing a head protection cover, characterized in that: The manufacturing method comprises the following steps: Injecting a target shot amount of plastic melt into the cavity of the injection mold; The blow needle is driven to blow air onto the plastic melt in the cavity to form a cover body with a hollow structure; within a first preset time, continuously blowing air onto the cover body in the cavity; Within a second preset time, the cover body is cooled, and the overflow on the cover body is punctured to discharge the gas, thereby forming a head protection cover.

2. The method for manufacturing a head protection cover according to claim 1, wherein: After the step of cooling the cover body and reducing the pressure in the cavity to a target pressure value within the second preset time to form the head protection cover, the method further includes: Repair and remove the overflow and waste materials of the head protection cover.

3. The method for manufacturing a head protection cover according to claim 1, wherein: In the step of driving the blowing needle to blow the plastic melt in the cavity to form a cover body with a hollow structure, the gas introduced by the blowing needle is an inert gas.

4. The method for manufacturing a head protection cover according to claim 3, wherein: In the step of driving the blow needle to blow air onto the plastic melt in the cavity to form a cover body with a hollow structure, the pressure of the gas blown into the cavity by the blow needle is 5-35 MPa.

5. The method for manufacturing a head protection cover according to claim 3, wherein: In the step of continuously blowing air into the cover body in the cavity within the first preset time, the pressure of the gas blown into the cavity by the blow needle is 10-20 MPa.

6. The method for manufacturing a head protection cover according to claim 3, wherein: In the step of injecting a target shot volume of plastic melt into the cavity of the injection mold, the target shot volume is 75%-95% of the full shot volume of the mold.

7. The method for manufacturing a head protection cover according to claim 3, wherein: The inert gas is nitrogen.

8. A head protection cover, characterized in that: The head protection cover is manufactured by the manufacturing method of the head protection cover according to any one of claims 1 to 7.

9. The head protection cover according to claim 8, characterized in that: The head protection cover comprises a cover body, and a middle portion of the cover body is provided with an escape opening for allowing the valve of the gas storage cylinder to extend out.

10. A gas storage cylinder, characterized in that: Comprising the head protection cover as described in claim 8 or 9.

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