A helmet integral pre-stretch forming device

Abstract

The utility model discloses a whole pre -tensile forming device of helmet, including base body, the inside upper and lower both ends of base body are provided with upper hydraulic cylinder body and lower hydraulic cylinder body respectively, and the upper hydraulic cylinder body and lower hydraulic cylinder body form forming cavity between, the inside sliding of lower hydraulic cylinder body is provided with working cylinder body, the top of working cylinder body is provided with helmet male die, the outside of helmet male die is provided with isostatic pressure elastic part, and the isostatic pressure elastic part forms mould cavity with helmet male die between, the utility model discloses the fibre fabric for preparing helmet is directly stretched and pre -formed as the blank shape of preparation helmet, and the cutting, the layering and the pre -pressing procedure in traditional craft are saved, only need to carry out hot -pressing forming can complete the preparation of helmet, not only has improved production efficiency significantly, also avoided material slip and displacement problem, has guaranteed the structural integrity and bulletproof performance of helmet.

Description

Technical Field

[0001] This utility model belongs to the technical field of helmet integral molding, specifically relating to a helmet integral pre-stretching molding device. Background Technology

[0002] As a crucial piece of individual protective equipment, the ballistic performance of bulletproof helmets directly impacts the user's safety. Traditional bulletproof helmet manufacturing processes employ multi-step methods, including cutting, layup, pre-compression, and hot pressing. The cutting process disrupts the continuity of material fibers, significantly reducing energy absorption efficiency under ballistic impact loads. The layup process relies on manual operation, making it difficult to ensure material positioning accuracy, and is cumbersome and inefficient. During pre-compression and hot pressing, the lack of pre-forming treatment makes slippage prone to occur, affecting the helmet's structural consistency and final ballistic performance. Existing improvements, such as three-dimensional weaving technology, can maintain fiber continuity, but are limited by high equipment investment costs and long processing cycles, hindering industrial application.

[0003] Therefore, based on the problems existing in the current helmet manufacturing process, this utility model discloses an integral pre-stretching forming device for helmets. Utility Model Content

[0004] This utility model discloses a helmet integral pre-stretching molding device, which directly stretches and pre-forms the fiber fabric used to prepare the helmet into a blank shape, eliminating the cutting, layering and pre-pressing processes in the traditional process. Only hot pressing is required to complete the preparation of the helmet, which not only significantly improves production efficiency, but also avoids material slippage and displacement problems, ensuring the structural integrity and ballistic performance of the helmet.

[0005] This utility model is achieved through the following technical solution:

[0006] A helmet pre-stretching forming device includes a base, with an upper hydraulic cylinder and a lower hydraulic cylinder respectively disposed at the upper and lower ends inside the base, forming a forming cavity between the upper and lower hydraulic cylinders; a working cylinder is slidably disposed inside the lower hydraulic cylinder, a helmet punch is disposed on the top of the working cylinder, and an isostatic elastic element is disposed outside the helmet punch, forming a mold cavity between the isostatic elastic element and the helmet punch.

[0007] The fiber fabric is laid inside the mold cavity, and then lifted upwards by the lower hydraulic cylinder and the working cylinder, which in turn lifts the helmet punch upwards, compressing the fiber fabric. Simultaneously, isostatic pressure elastic elements located outside the helmet punch undergo elastic deformation in sync with the fiber fabric, providing inward-covering isostatic pressure to ensure the fiber fabric is uniformly pressurized and rapidly formed. Furthermore, by applying isostatic pressure evenly to the fiber fabric, slippage and displacement between the different layers of the fiber fabric are avoided, thus ensuring the integrity and ballistic performance of the final helmet.

[0008] To better realize this utility model, the bottom of the upper hydraulic cylinder body is provided with an upper cavity, and a pressing groove is provided at the bottom opening edge of the upper cavity. The edge of the isostatic elastic element is engaged with the pressing groove, and the interior of the upper cavity is filled with conductive oil.

[0009] To better realize this utility model, the isostatic elastic element further includes a rubber bladder, which is capable of elastic deformation consistent with the outer contour shape of the helmet punch.

[0010] To better realize this utility model, the upper hydraulic cylinder body further includes a first upper cylinder body and a second upper cylinder body. The first upper cylinder body is fixedly disposed on the inner top of the base body, and the second upper cylinder body is slidably disposed on the inner top of the first upper cylinder body. An elastic element is disposed between the first upper cylinder body and the second upper cylinder body.

[0011] To better realize this utility model, the upper cavity is further located between the second upper cylinder and the isostatic elastic element.

[0012] To better realize this utility model, the lower hydraulic cylinder body further includes a first lower cylinder body and a second lower cylinder body. The first lower cylinder body is fixedly disposed at the bottom inner side of the base body, and the second lower cylinder body is slidably disposed at the top inner side of the first lower cylinder body. A helmet punch is slidably disposed at the top inner side of the second lower cylinder body.

[0013] To better realize this utility model, the first lower cylinder body is further provided with a first working pipe communicating with the inner cavity of the second lower cylinder body, and the side wall of the second lower cylinder body is provided with a second working pipe communicating with the molding cavity; the first lower cylinder body is also provided with a first main pipe and a second main pipe.

[0014] To better realize this utility model, the bottom of the working cylinder is provided with a recessed cavity, which is connected to the inner cavity.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] This invention enables the direct stretching and preforming of raw fiber fabrics for helmet production into a blank shape, eliminating the cutting, layering, and pre-pressing processes in traditional methods. This maintains fiber continuity, and helmet production can be completed solely through hot pressing. This significantly improves production efficiency and avoids material slippage issues during pre-pressing and hot pressing, ensuring the helmet's structural integrity, consistency, and ballistic performance. Furthermore, during the compression molding process, the helmet punch and isostatic elastic element work together to provide inward-covering isostatic pressure, ensuring the fiber fabric is uniformly compressed and rapidly molded. The uniform application of isostatic pressure also prevents slippage and displacement between layers, thus guaranteeing the final helmet's integrity and ballistic performance. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall pre-stretching and forming device for helmets;

[0018] Figure 2 This is a structural schematic diagram of the upper and lower hydraulic cylinders;

[0019] Figure 3 A schematic diagram of the internal piping of the helmet pre-stretching forming device;

[0020] Figure 4 This is a schematic diagram of the working cylinder.

[0021] Figure 5 for Figure 4 A magnified view of part A.

[0022] Wherein: 1-Base; 2-Upper hydraulic cylinder; 3-Lower hydraulic cylinder; 4-Forming cavity; 5-Working cylinder; 6-Helmet punch; 7-Isostatic elastic element; 100-Upper cavity; 200-Pressure groove; 300-Cavity; 21-First upper cylinder; 22-Second upper cylinder; 23-Elastic element; 31-First lower cylinder; 32-Second lower cylinder; 101-First working pipeline; 102-Second working pipeline; 103-Inner cavity; 104-First main pipeline; 105-Second main pipeline. Detailed Implementation

[0023] Example 1:

[0024] This embodiment provides a helmet integral pre-stretching forming device, such as... Figures 1-4As shown, the device includes a base 1, with an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3 respectively disposed at the upper and lower ends inside the base 1, forming a molding cavity 4 between the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3; a working cylinder 5 is slidably disposed inside the lower hydraulic cylinder 3, a helmet punch 6 is disposed on the top of the working cylinder 5, and an isostatic elastic element 7 is disposed on the outside of the helmet punch 6, forming a mold cavity between the isostatic elastic element 7 and the helmet punch 6.

[0025] The base of the substrate 1 is made of high-strength steel to ensure stable support for the substrate 1. The substrate 1 is a frame consisting of two beams and two columns, which are then wound together with high-strength steel wire to form a unified composite stress structure. The beams and columns are made of high-quality carbon structural steel. After winding, the steel wire layer is cured and sealed with epoxy resin.

[0026] The isostatically compressed elastic element 7 can undergo elastic deformation with a shape consistent with the helmet punch 6. The cavity between the isostatically compressed elastic element 7 and the helmet punch 6 is used to lay and place fiber fabric. There is a closed hydraulic oil cavity between the isostatically compressed elastic element 7 and the upper hydraulic cylinder 2. The upper hydraulic cylinder 2, the lower hydraulic cylinder 3, and the working cylinder 5 are made of high-strength alloy structural steel.

[0027] After the lower hydraulic cylinder 3 is filled with oil, it drives the working cylinder 5 and the helmet punch 6 to move upwards, and the lower hydraulic cylinder 3 assembles with the upper hydraulic cylinder 2. At this time, the helmet punch 6, in conjunction with the isostatic pressing elastic element 7, extrudes and shapes the fiber fabric inside the mold cavity. Simultaneously, the isostatic pressing elastic element 7 provides inward-covering isostatic pressure to the fiber fabric, ensuring that the fiber fabric is uniformly pressurized and rapidly shaped. Furthermore, by uniformly applying isostatic pressure to the fiber fabric, slippage and displacement between the layers of the fiber fabric are avoided, thus ensuring the integrity and ballistic performance of the final helmet.

[0028] Example 2:

[0029] This embodiment discloses a helmet integral pre-stretching forming device, which is an optimization based on Embodiment 1, such as... Figure 5 As shown, the bottom of the upper hydraulic cylinder body 2 is provided with an upper cavity 100, and a pressure groove 200 is provided at the bottom opening edge of the upper cavity 100. The edge of the isostatic elastic element 7 is engaged with the pressure groove 200, and the interior of the upper cavity 100 is filled with conductive oil.

[0030] When the lower hydraulic cylinder 3 presses upward, it stretches the edge of the fiber fabric and enters the pressing groove 200. The pressing contact surface inside the pressing groove 200 provides pressing force for the pre-stretching and forming of the fiber fabric.

[0031] Furthermore, the isostatic elastic element 7 includes a rubber bladder, which can achieve elastic deformation consistent with the outer contour shape of the helmet punch 6. The rubber bladder is made of polyurethane synthetic rubber, with a hardness greater than Shore hardness 70, an elongation at break of not less than 500%, and a tensile strength of not less than 250 kg / cm². 2 .

[0032] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0033] Example 3:

[0034] This embodiment discloses a helmet integral pre-stretching forming device, which is an optimization based on Embodiment 1 or 2, such as... Figures 2-4 As shown, the upper hydraulic cylinder body 2 includes a first upper cylinder body 21 and a second upper cylinder body 22. The first upper cylinder body 21 is fixedly disposed on the top inner side of the base body 1, and the second upper cylinder body 22 is slidably disposed on the top inner side of the first upper cylinder body 21. An elastic element 23 is disposed between the first upper cylinder body 21 and the second upper cylinder body 22. The upper cavity 100 is located between the second upper cylinder body 22 and the isostatic elastic element 7, and the upper cavity 100 is filled with conductive oil.

[0035] When the lower hydraulic cylinder 3 drives the working cylinder 5 and the helmet punch 6 to lift and compress the fiber fabric, it also compresses the isostatic elastic element 7 and the conductive oil inside the upper cavity 100. This, in turn, causes the second upper cylinder 22 to slide upward relative to the first upper cylinder 21, at which point the elastic element 23 stretches. The sliding of the second upper cylinder 22 and the stretching of the elastic element 23 buffer the pressure on the fiber fabric, making the pressure on the fiber fabric more uniform and smooth, effectively preventing sudden pressure changes that could cause slippage and misalignment between the layers of the fiber fabric.

[0036] Furthermore, the elastic element 23 includes a spring, which is made of high-strength spring steel.

[0037] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0038] Example 4:

[0039] This embodiment discloses a helmet integral pre-stretching forming device, which is optimized based on any one of embodiments 1-3, such as... Figures 2-4 As shown, the lower hydraulic cylinder 3 includes a first lower cylinder 31 and a second lower cylinder 32. The first lower cylinder 31 is fixedly disposed at the bottom inner side of the base 1. The second lower cylinder 32 is slidably disposed at the top inner side of the first lower cylinder 31. The helmet punch 6 is slidably disposed at the top inner side of the second lower cylinder 32.

[0040] The first lower cylinder 31 is provided with a first working pipe 101 that communicates with the inner cavity 103 of the second lower cylinder 32. The second lower cylinder 32 is provided with a second working pipe 102 that communicates with the molding cavity 4 on its side wall. The first lower cylinder 31 is also provided with a first main pipe 104 and a second main pipe 105.

[0041] When oil enters through the first main pipeline 104 and exits through the second main pipeline 105, the second lower cylinder 32 slides upward within the inner cavity of the first lower cylinder 31; conversely, when oil exits through the first main pipeline 104 and enters through the second main pipeline 105, the second lower cylinder 32 slides downward within the inner cavity of the first lower cylinder 31. When oil enters through the first working pipeline 101 and exits through the second working pipeline 102, the working cylinder 5 slides upward within the inner cavity of the second lower cylinder 32; conversely, when oil exits through the first working pipeline 101 and enters through the second working pipeline 102, the working cylinder 5 slides downward within the inner cavity of the second lower cylinder 32.

[0042] Furthermore, a recessed cavity 300 is provided at the bottom of the working cylinder 5. The recessed cavity 300 is connected to the inner cavity 103. By providing the recessed cavity 300, when the first working pipeline 101 is filled with oil, the hydraulic oil first fills the inner cavity 103 and then gradually enters the recessed cavity 300, so as to smoothly drive the working cylinder 5 to move upward.

[0043] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A helmet integral pre-stretching forming device, comprising a base (1), characterized in that, The base (1) has an upper hydraulic cylinder (2) and a lower hydraulic cylinder (3) respectively at its upper and lower ends. A forming cavity (4) is formed between the upper hydraulic cylinder (2) and the lower hydraulic cylinder (3). A working cylinder (5) is slidably arranged inside the lower hydraulic cylinder (3). A helmet punch (6) is arranged on the top of the working cylinder (5). An isostatic elastic element (7) is arranged on the outside of the helmet punch (6). A mold cavity is formed between the isostatic elastic element (7) and the helmet punch (6).

2. The helmet integral pre-stretching forming device according to claim 1, characterized in that, The bottom of the upper hydraulic cylinder body (2) is provided with an upper cavity (100), and a pressure groove (200) is provided at the bottom opening edge of the upper cavity (100). The edge of the isostatic elastic element (7) is engaged with the pressure groove (200), and the interior of the upper cavity (100) is filled with conductive oil.

3. The helmet integral pre-stretching forming device according to claim 2, characterized in that, The isostatic elastic element (7) includes a rubber bladder, which is capable of elastic deformation that is consistent with the outer contour shape of the helmet punch (6).

4. A helmet integral pre-stretching forming device according to claim 2 or 3, characterized in that, The upper hydraulic cylinder body (2) includes a first upper cylinder body (21) and a second upper cylinder body (22). The first upper cylinder body (21) is fixedly installed on the top inner side of the base body (1). The second upper cylinder body (22) is slidably installed on the top inner side of the first upper cylinder body (21). An elastic element (23) is provided between the first upper cylinder body (21) and the second upper cylinder body (22).

5. The helmet integral pre-stretching forming device according to claim 4, characterized in that, The upper cavity (100) is located between the second upper cylinder (22) and the isostatic elastic element (7).

6. A helmet integral pre-stretching forming device according to any one of claims 1-3, characterized in that, The lower hydraulic cylinder body (3) includes a first lower cylinder body (31) and a second lower cylinder body (32). The first lower cylinder body (31) is fixedly installed at the bottom of the inner side of the base body (1). The second lower cylinder body (32) is slidably installed on the top inner side of the first lower cylinder body (31). The helmet punch (6) is slidably installed on the top inner side of the second lower cylinder body (32).

7. The helmet integral pre-stretching forming device according to claim 6, characterized in that, The first lower cylinder (31) is provided with a first working pipe (101) that communicates with the inner cavity (103) of the second lower cylinder (32), and the second lower cylinder (32) is provided with a second working pipe (102) that communicates with the molding cavity (4) on its side wall; the first lower cylinder (31) is also provided with a first main pipe (104) and a second main pipe (105).

8. The helmet integral pre-stretching forming device according to claim 7, characterized in that, The bottom of the working cylinder (5) is provided with a cavity (300), which is connected to the inner cavity (103).

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