Inner shell of protective hat

Abstract

The utility model relates to an inner shell of a protective hat, which comprises a shell body, the shell body comprises a forehead part, a head top part, a head back part and two side surface parts, the two side surface parts are respectively connected with the left end and the right end of the head back part, and the two side surface parts are respectively connected with the left end and the right end of the head top part. The forehead part and the back head part are connected with the front end and the back end of the head top part respectively, the two side face parts are connected with the left end and the right end of the forehead part respectively, and the included angle alpha between the forehead part and the horizontal plane ranges from 76 degrees to 86 degrees. Compared with the prior art, the inner shell of the protective helmet has the advantages that the inner shell of the protective helmet is higher in deformation resistance compared with an inner shell in the market, the structural integrity of the helmet can be better kept, meanwhile, the inner shell of the protective helmet is better in impact force absorption and dispersion performance compared with the inner shell in the market, local stress concentration can be effectively reduced, and therefore higher safety is provided; and a better protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hat technical field, especially a kind of inner shell of protective cap. BACKGROUND

[0002] At present, in order to meet the needs of daily duty, the first-line police, auxiliary police are also equipped with a cap. This hat is particularly suitable for spring and autumn season to match the uniform, but the protective property is poor in handling emergency event. Therefore, in the prior art, protective inner shell is added in the cap, but the existing inner shell is usually made to completely fit the shape of the cap, which has insufficient anti-deformation performance. UTILITY MODEL CONTENT

[0003] The purpose of the present application is to provide an inner shell of protective cap, which has better protective property.

[0004] The technical scheme adopted by the present application is as follows: an inner shell of protective cap, comprising a shell body, the shell body includes a forehead part, a crown part, a back of the head part and two side parts, the front and rear ends of the crown part are connected with the forehead part and the back of the head part respectively, the left and right ends of the crown part are connected with the two side parts respectively, the left and right ends of the forehead part are connected with the two side parts respectively, the left and right ends of the back of the head part are connected with the two side parts respectively, and the included angle α between the forehead part and the horizontal plane is 76°-86°.

[0005] In some embodiments of the present application, the included angle β between the crown part and the horizontal plane is 10°±2°, and the outer surface of the crown part is arc surface.

[0006] In some embodiments of the present application, the included angle γ between the back of the head part and the horizontal plane is 44°±0.5°, and the outer surface of the back of the head part is arc surface.

[0007] In some embodiments of the present application, the included angle δ between the side part and the horizontal plane is 75°±3°, and the outer surface of the side part is arc surface.

[0008] In some embodiments of the present application, the included angle δ between the side part and the horizontal plane is 76°-86°, and the included angle δ between the side part and the horizontal plane is the same as the included angle α between the forehead part and the horizontal plane.

[0009] In some embodiments of the present application, the included angle β between the crown part and the horizontal plane is 7.5°±2°, and the outer surface of the crown part is arc surface.

[0010] In some embodiments of the present application, the included angle γ between the back of the head part and the horizontal plane is 45°±0.5°, and the outer surface of the back of the head part is arc surface.

[0011] In some embodiments of the present application, the back of the head part is provided with a notch.

[0012] In some embodiments of the present application, the shell is made of carbon fiber composite material; the shell thickness is 0.6mm-0.7mm.

[0013] In some embodiments of the present application, the outer surface of the forehead part is arc surface; the side part is provided with air holes.

[0014] Further, the air holes are located in the upper half of the shell 1.

[0015] The inner shell of the protective cap has the following advantages: 1. Compared with the inner shell on the market, the anti-deformation ability is stronger, the structural integrity of the helmet can be better maintained, the impact force absorption and dispersion performance is better, the local stress concentration can be effectively reduced, higher safety can be provided, and better protection effect can be achieved; 2. Good air permeability and good wearing comfort. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the front view of the embodiment 1 of the utility model, and

[0017] Figure 2 is the left view of the embodiment 1 of the utility model, and

[0018] Figure 3 is the structure schematic view of the embodiment 1 of the utility model, and

[0019] Figure 4 is the structure schematic view of the baseball helmet inner shell on the market, and

[0020] Figure 5a is the impact point schematic view of the top surface of the embodiment 1 of the utility model, and

[0021] Figure 5b is the impact point schematic view of the front surface of the embodiment 1 of the utility model, and

[0022] Figure 5c is the impact point schematic view of the back surface of the embodiment 1 of the utility model, and

[0023] Figure 5d is the impact point schematic view of the left surface of the embodiment 1 of the utility model, and

[0024] Figure 5e is the impact point schematic view of the right surface of the embodiment 1 of the utility model, and

[0025] Figure 6a is the mesh division schematic view of the embodiment 1 of the utility model, and

[0026] Figure 6b is the mesh division schematic view of the baseball helmet inner shell on the market, and

[0027] Figure 7is a schematic diagram of the constraint and load application of the embodiment 1 of the utility model;

[0028] Figure 8a is the deformation result of the impact point 5 of the inner shell of the baseball type helmet on the market when the impact speed is 6m / s;

[0029] Figure 8b is the deformation result of the impact point 1 of the inner shell of the baseball type helmet on the market when the impact speed is 6m / s;

[0030] Figure 9a is the stress result of the impact point 5 of the inner shell of the baseball type helmet on the market when the impact speed is 6m / s;

[0031] Figure 9b is the stress result of the impact point 1 of the inner shell of the baseball type helmet on the market when the impact speed is 6m / s;

[0032] Figure 10a is the deformation result of the impact point 5 of the inner shell of the baseball type helmet on the market when the impact speed is 12m / s;

[0033] Figure 10b is the deformation result of the impact point 1 of the inner shell of the baseball type helmet on the market when the impact speed is 12m / s;

[0034] Figure 11a is the stress result of the impact point 5 of the inner shell of the baseball type helmet on the market when the impact speed is 12m / s;

[0035] Figure 11b is the stress result of the impact point 1 of the inner shell of the baseball type helmet on the market when the impact speed is 12m / s;

[0036] Figure 12a is the deformation result of the impact point 5 of the embodiment 1 of the utility model when the impact speed is 6m / s;

[0037] Figure 12b is the deformation result of the impact point 1 of the embodiment 1 of the utility model when the impact speed is 6m / s;

[0038] Figure 13a is the stress result of the impact point 5 of the embodiment 1 of the utility model when the impact speed is 6m / s;

[0039] Figure 13b is the stress result of the impact point 1 of the embodiment 1 of the utility model when the impact speed is 6m / s;

[0040] Figure 14a is the deformation result of the impact point 5 of the embodiment 1 of the utility model when the impact speed is 12m / s;

[0041] Figure 14bis the stress result of the impact point 5 of the embodiment 1 of the utility model when the impact speed is 12 m / s;

[0042] Figure 15a is the stress result of the impact point 1 of the embodiment 1 of the utility model when the impact speed is 12 m / s;

[0043] Figure 15b is the stress result of the impact point 1 of the embodiment 1 of the utility model when the impact speed is 12 m / s;

[0044] Figure 16 is the broken line graph of the maximum stress data of the embodiment 1 of the utility model when the impact speed is 6 m / s;

[0045] Figure 17 is the broken line graph of the maximum deformation data of the embodiment 1 of the utility model when the impact speed is 6 m / s;

[0046] Figure 18 is the broken line graph of the maximum stress data of the embodiment 1 of the utility model when the impact speed is 12 m / s;

[0047] Figure 19 is the broken line graph of the maximum deformation data of the embodiment 1 of the utility model when the impact speed is 12 m / s;

[0048] Figure 20 is the broken line graph of the maximum stress data of the embodiment 1 of the utility model when the impact speed is 24 m / s;

[0049] Figure 21 is the broken line graph of the maximum deformation data of the embodiment 1 of the utility model when the impact speed is 24 m / s;

[0050] Figure 22 is the front view of the embodiment 2 of the utility model;

[0051] Figure 23 is the left view of the embodiment 2 of the utility model;

[0052] Figure 24 is the structural schematic view of the embodiment 2 of the utility model;

[0053] Figure 25 is the structural schematic view of the inner shell of the steel helmet type helmet on the market;

[0054] Figure 26a is the impact point schematic view of the top surface of the embodiment 2 of the utility model;

[0055] Figure 26b is the impact point schematic view of the front surface of the embodiment 2 of the utility model;

[0056] Figure 26cis the impact point schematic view of the back of the embodiment 2 of the utility model;

[0057] Figure 26d is the impact point schematic view of the left of the embodiment 2 of the utility model;

[0058] Figure 26e is the impact point schematic view of the right of the embodiment 2 of the utility model;

[0059] Figure 27a is the mesh division schematic view of the embodiment 2 of the utility model;

[0060] Figure 27b is the mesh division schematic view of the helmet type helmet inner shell on the market;

[0061] Figure 28 is the schematic view of the constraint and load application of the embodiment 2 of the utility model;

[0062] Figure 29a is the deformation result of the impact point 3 of the helmet type helmet inner shell on the market when the impact speed is 12m / s;

[0063] Figure 29b is the deformation result of the impact point 2 of the helmet type helmet inner shell on the market when the impact speed is 12m / s;

[0064] Figure 30a is the stress result of the impact point 3 of the helmet type helmet inner shell on the market when the impact speed is 12m / s;

[0065] Figure 30b is the stress result of the impact point 2 of the helmet type helmet inner shell on the market when the impact speed is 12m / s;

[0066] Figure 31a is the deformation result of the impact point 3 of the helmet type helmet inner shell on the market when the impact speed is 24m / s;

[0067] Figure 31b is the deformation result of the impact point 2 of the helmet type helmet inner shell on the market when the impact speed is 24m / s;

[0068] Figure 32a is the stress result of the impact point 3 of the helmet type helmet inner shell on the market when the impact speed is 24m / s;

[0069] Figure 32b is the stress result of the impact point 2 of the helmet type helmet inner shell on the market when the impact speed is 24m / s;

[0070] Figure 33a is the deformation result of the impact point 3 of the embodiment 2 of the utility model when the impact speed is 12m / s;

[0071] Figure 33b is the deformation result of the impact point 2 of the utility model embodiment 2 when the impact speed is 12 m / s;

[0072] Figure 34a is the stress result of the impact point 3 of the utility model embodiment 2 when the impact speed is 12 m / s;

[0073] Figure 34b is the stress result of the impact point 2 of the utility model embodiment 2 when the impact speed is 12 m / s;

[0074] Figure 35a is the deformation result of the impact point 3 of the utility model embodiment 2 when the impact speed is 24 m / s;

[0075] Figure 35b is the deformation result of the impact point 2 of the utility model embodiment 2 when the impact speed is 24 m / s;

[0076] Figure 36a is the stress result of the impact point 3 of the utility model embodiment 2 when the impact speed is 24 m / s;

[0077] Figure 36b is the stress result of the impact point 2 of the utility model embodiment 2 when the impact speed is 24 m / s;

[0078] Figure 37 is the broken line graph of the maximum stress data of the utility model embodiment 2 when the impact speed is 6 m / s;

[0079] Figure 38 is the broken line graph of the maximum deformation data of the utility model embodiment 2 when the impact speed is 6 m / s;

[0080] Figure 39 is the broken line graph of the maximum stress data of the utility model embodiment 2 when the impact speed is 12 m / s;

[0081] Figure 40 is the broken line graph of the maximum deformation data of the utility model embodiment 2 when the impact speed is 12 m / s;

[0082] Figure 41 is the broken line graph of the maximum stress data of the utility model embodiment 2 when the impact speed is 24 m / s;

[0083] Figure 42 is the broken line graph of the maximum deformation data of the utility model embodiment 2 when the impact speed is 24 m / s.

[0084] In the figure: 1, shell; 2, forehead part; 3, top of head part; 4, back of head part; 5, side part; 6, notch; 7, air hole; 8, first connecting part; 9, second connecting part. DETAILED DESCRIPTION

[0085] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the following will combine the drawings and preferred embodiments to specifically describe the specific embodiments, structures, features and effects of the utility model.

[0086] Embodiment 1

[0087] The inner shell of the protective cap provided in this embodiment, as shown in Figure 1 、 Figure 2 、 Figure 3 includes a shell body 1, the shell body 1 includes a forehead part 2, a crown part 3, a back of the head part 4 and two side parts 5, the front and rear ends of the crown part 3 are connected with the forehead part 2 and the back of the head part 4 respectively, the left and right ends of the crown part 3 are connected with the two side parts 5 respectively, the left and right ends of the forehead part 2 are connected with the two side parts 5 respectively, the left and right ends of the back of the head part 4 are connected with the two side parts 5 respectively, the included angle α between the forehead part 2 and the horizontal plane is 76°; the outer surface of the forehead part 2 is a curved surface. The crown part 3 and the forehead part 2 are circularly arc transitioned; the crown part 3 and the back of the head part 4 are circularly arc transitioned; the crown part 3 and the side part 5 are circularly arc transitioned; the forehead part 2 and the side part 5 are circularly arc transitioned; the back of the head part 4 and the side part 5 are circularly arc transitioned. The highest point of the connecting arc surface between the crown part 3 and the forehead part 2 is lower than the highest point of the connecting arc surface between the crown part 3 and the back of the head part 4. The included angle α between the forehead part 2 and the horizontal plane is 76°, which can effectively improve the anti-deformation capacity at the forehead, and the effect of absorbing and dispersing the impact force is good; the outer surface of the forehead part 2 is a curved surface, which can effectively reduce local stress concentration.

[0088] In order to improve the impact resistance of the crown part 3, the included angle β between the crown part 3 and the horizontal plane is 10°, which can effectively improve the anti-deformation capacity at the crown, and the effect of absorbing and dispersing the impact force is good; the outer surface of the crown part 3 is a curved surface, which can effectively reduce local stress concentration.

[0089] In order to improve the impact resistance of the back of the head part 4, the included angle γ between the back of the head part 4 and the horizontal plane is 44°, which can effectively improve the anti-deformation capacity at the back of the head, and the effect of absorbing and dispersing the impact force is good; the outer surface of the back of the head part 4 is a curved surface, which can effectively reduce local stress concentration.

[0090] In order to improve the impact resistance of the side part 5, the included angle δ between the side part 5 and the horizontal plane is 75°, which can effectively improve the anti-deformation capacity of the side, and the effect of absorbing and dispersing the impact force is good; the outer surface of the side part 5 is a curved surface, which can effectively reduce local stress concentration.

[0091] The side part 5 is connected with the top part 3 through a first connecting part 8, the included angle η between the first connecting part 8 and the horizontal plane is 45°, which can effectively improve the anti-deformation ability of the side part, and the effect of absorbing and dispersing the impact force is good; the outer surface of the first connecting part 8 is arc surface, which can effectively reduce the local stress concentration.

[0092] The first connecting part 8 is connected with the top part 3 through a second connecting part 9, the included angle θ between the second connecting part 9 and the horizontal plane is 12°, which can effectively improve the anti-deformation ability of the side part, and the effect of absorbing and dispersing the impact force is good; the outer surface of the second connecting part 9 is arc surface, which can effectively reduce the local stress concentration.

[0093] In order to facilitate the size adjustment, the back part 4 is provided with a gap 6. The design of the gap 6 can increase the overall deformation amount and improve the overall elasticity. When the gap 6 is under stress, it can contract inwardly or expand outwardly, so that the size of the inner shell can be adjusted to adapt to different head shapes and improve the wearing comfort. At the same time, the hair of female users can also be exposed from the gap 6, which is also convenient for the lower part of the inner shell to ventilate.

[0094] In order to have high structural strength, the shell 1 is made of carbon fiber composite material; the thickness of the shell 1 is 0.6mm-0.7mm, which is thin and has little influence on the installation in the hat. In this embodiment, the thickness of the shell 1 is 0.7mm.

[0095] In order to improve the ventilation, the side part 5 is provided with a ventilation hole 7.

[0096] In order to improve the ventilation of the upper part of the inner shell, the ventilation hole 7 is located in the upper half of the shell 1, so that the lower part of the inner shell has the gap 6 for ventilation, and the upper part of the inner shell ventilates through the ventilation hole 7, the overall ventilation effect is good, and when the user wears the hat, the hot air is also easy to accumulate on the top of the head. The ventilation hole 7 is arranged in the upper part, which can discharge the accumulated hot air.

[0097] The impact experiment of the inner shell of the protective cap in this embodiment and the inner shell of the baseball type helmet on the market is as follows:

[0098] The inner shell of the protective cap in this embodiment and the inner shell of the baseball type helmet on the market both use anisotropic carbon fiber composite material, and the detailed parameters are as shown in Table 1:

[0099] Table 1

[0100] Direction Density (g / cm 3 )]]> Elastic Modulus (Mpa) Poisson's Ratio Shear Modulus (Mpa) XY 1.7 500 0.07 4 YZ 1.7 500 0.3 2 XZ 1.7 5 0.3 2

[0101] The impact body adopts a spherical body with a diameter of 10mm, and the material adopts structural steel, and the detailed parameters are as shown in Table 2:

[0102] Table 2

[0103] Material Density (g / cm 3 )]]> Young's Modulus (Mpa) Poisson's Ratio Shear Modulus (Mpa) Structural Steel 7.85 200 0.3 76.92

[0104] As Figure 4 shown in the figure, the angle between the top of the baseball helmet inner shell on the market and the horizontal plane is less than 5°, the angle between the back of the head and the horizontal plane is 45°, the angle between the upper part of the forehead and the horizontal plane is 45°, and the angle between the lower part of the forehead and the horizontal plane is 90°.

[0105] The specific steps are as follows:

[0106] 1. Calculate the working condition

[0107] The inner shell of the protective cap in this embodiment is fixed and supported inside, and is impacted and collided at eight positions as shown in Figure 5a - Figure 5e , the red dot is the impact force point, Figure 5a , which is impact point 1, Figure 5b , from top to bottom, impact point 2 and impact point 3, Figure 5c , which is impact point 4, Figure 5d , from top to bottom, impact point 5 and impact point 6, Figure 5e , from top to bottom, impact point 7 and impact point 8. Since the inner shell is a left-right symmetrical structure, impact points 5 and 6 and impact points 7 and 8 only need to be calculated. Therefore, in this embodiment, only the data of impact points 1-6 are calculated. The red impact force point is impacted by a sphere with a diameter of 10mm, and the impact speed is 6m / s, 12m / s and 24m / s, respectively, for three experiments. The inner shell of the baseball helmet on the market is also fixed and supported inside, and eight impact and collision positions are set for experiments.

[0108] 2. Grid division

[0109] To ensure that the control variable is unique, the same grid cell division method is used for the inner shell of the baseball helmet on the market and the inner shell of the protective cap in this embodiment. At the same time, in order to realize fast and accurate calculation, the impact area is encrypted. Among them, the grid division of the inner shell of the baseball helmet on the market is shown in Figure 6b , and the grid division of the inner shell of the protective cap in this embodiment is shown in Figure 6a .

[0110] 3. Constraints and load application

[0111] According to the calculation working condition requirement in step 1, constraints and loads are applied. In this embodiment, the calculation time is uniformly set to 0.005s. Given the large number of calculation working conditions, the figure of constraint and load application is not shown one by one. Taking the inner shell of the baseball helmet on the market as an example, when impact point 1 is impacted at a speed of 6m / s, the constraint and load application is shown in Figure 7 .

[0112] 4. Impact result analysis

[0113] 4.1, for the impact point 1 and the impact point 5 of the inner shell of the baseball helmet on the market, the impact velocity is 6m / s and 12m / s

[0114] 4.11, the impact velocity is 6m / s

[0115] When the impact velocity is 6m / s, the deformation result and the stress result of the impact point 1 of the inner shell of the baseball helmet on the market are shown in Figure 8b and Figure 9b respectively, for the impact point 1, the maximum deformation is 0.00058764mm, and the maximum stress is 2.4443Mpa; as shown in Figure 8a and Figure 9a for the impact point 5, the maximum deformation is 0.00054941mm, and the maximum stress is 3.8861Mpa.

[0116] 4.12, the impact velocity is 12m / s

[0117] When the impact velocity is 12m / s, the deformation result and the stress result of the impact point 1 of the inner shell of the baseball helmet on the market are shown in Figure 10b and Figure 11b respectively, for the impact point 1, the maximum deformation is 0.00065616mm, and the maximum stress is 3.206Mpa; as shown in Figure 10a and Figure 11a for the impact point 5, the maximum deformation is 0.00055907mm, and the maximum stress is 5.2225Mpa.

[0118] 4.2, for the impact point 1 and the impact point 5 of the inner shell of the protective cap in the embodiment, the impact velocity is 6m / s and 12m / s

[0119] 4.21, the impact velocity is 6m / s

[0120] When the impact velocity is 6m / s, the deformation result and the stress result of the impact point 1 of the inner shell of the protective cap in the embodiment are shown in Figure 12b and Figure 13b respectively, for the impact point 1, the maximum deformation is 0.00019574mm, and the maximum stress is 1.7516Mpa; as shown in Figure 12a and Figure 13a for the impact point 5, the maximum deformation is 0.00034004mm, and the maximum stress is 1.1748Mpa.

[0121] 4.22, the impact velocity is 12m / s

[0122] When the impact velocity is 12m / s, the deformation result and the stress result of the impact point 1 of the inner shell of the protective cap in the embodiment are shown in Figure 14b and Figure 15bAs shown, for impact point 1, the maximum deformation is 0.00018279 mm and the maximum stress is 2.4251 Mpa; as shown, Figure 14a and Figure 15a As shown, for impact point 5, the maximum deformation is 0.00036342 mm and the maximum stress is 2.3674 Mpa.

[0123] 5. Comparative analysis

[0124] 5.1, impact speed is 6 m / s

[0125] Under the condition of impact speed of 6 m / s, the maximum deformation is as shown in Table 3:

[0126] Table 3

[0127] Impact Point Inner Shell - Maximum Deformation / mm - Commercial Inner Shell - Maximum Deformation / mm - This Example 1 0.0005876 0.00019574 2 0.0002417 0.00010633 3 0.0004215 0.00030028 4 0.0003124 0.00019674 5 0.0005494 0.00034004 6 0.0002134 0.00012043

[0128] Under the condition of impact speed of 6 m / s, the maximum stress is as shown in Table 4:

[0129] Table 4

[0130] Impact Point Inner Shell - Maximum Stress Mpa - Commercial Inner Shell - Maximum Stress Mpa - This Example 1 2.4443 1.7516 2 0.5495 0.2466 3 1.3456 0.75032 4 1.2146 0.7477 5 3.8861 1.1748 6 1.8954 1.0284

[0131] Under the condition of impact speed of 6 m / s, from Table 3 and Figure 17 , it can be seen that the maximum deformation value of the inner shell of the baseball helmet on the market ranges from 0.0002134 mm to 0.0005876 mm, while the maximum deformation value of the inner shell of the protective cap in this embodiment ranges from 0.00012043 mm to 0.00019574 mm. It can be clearly seen that the maximum deformation value of the inner shell of the protective cap in this embodiment at all impact points is significantly lower than that of the inner shell of the baseball helmet on the market, indicating that the inner shell of the protective cap in this embodiment performs better in terms of deformation resistance and can better maintain structural integrity under strong impact, providing more effective protection performance for the user. From Table 4 and Figure 16 , it can be seen that the maximum stress value of the inner shell of the baseball helmet on the market ranges from 0.5495 Mpa to 3.8861 Mpa, while the maximum stress value of the inner shell of the protective cap in this embodiment ranges from 0.2466 Mpa to 1.7516 Mpa. Similarly, the maximum stress value of the inner shell of the protective cap in this embodiment at all impact points is lower than that of the inner shell of the baseball helmet on the market, indicating that the inner shell of the protective cap in this embodiment is more effective in dispersing impact force and can reduce local stress concentration.

[0132] 5.2, impact speed is 12 m / s

[0133] Under the condition of impact speed of 12 m / s, the maximum deformation is as shown in Table 5:

[0134] Table 5

[0135] Impact Point Inner Shell - Maximum Deformation / mm - Commercial Inner Shell - Maximum Deformation / mm - This Example 1 0.0006561 0.00018279 2 0.0006542 0.0004354 3 0.0005421 0.0003309 4 0.0004852 0.0003542 5 0.0005591 0.0003634 6 0.0003425 0.0002295

[0136] The maximum stress at the impact speed of 12 m / s is shown in Table 6 below:

[0137] Table 6

[0138]

[0139]

[0140] At the impact speed of 12 m / s, it can be seen from the maximum deformation data in Table 5 and Figure 19 that the maximum deformation values of the inner shells of the commercially available baseball helmets range from 0.0003425 mm to 0.0006561 mm, while the maximum deformation values of the inner shells of the protective helmets in the present embodiment range from 0.00018279 mm to 0.0003634 mm. It can be clearly seen that the maximum deformation values of the inner shells of the protective helmets in the present embodiment are significantly lower than those of the commercially available baseball helmets at all impact points, which indicates that the inner shells of the protective helmets in the present embodiment have stronger deformation resistance and can maintain their structural stability at higher impact speeds. From the maximum stress data in Table 6 and Figure 18 that the maximum stress values of the inner shells of the commercially available baseball helmets range from 1.8246 MPa to 5.2225 MPa, while the maximum stress values of the inner shells of the protective helmets in the present embodiment range from 0.9022 MPa to 2.4251 MPa. Similarly, the maximum stress values of the inner shells of the protective helmets in the present embodiment are lower than those of the commercially available baseball helmets at all impact points, which indicates that the inner shells of the protective helmets in the present embodiment perform better in dispersing impact forces and can effectively reduce local stress concentration.

[0141] 5.3, Impact speed of 24 m / s

[0142] The maximum deformation at the impact speed of 24 m / s is shown in Table 7 below:

[0143] Table 7

[0144] Impact Point Inner Shell - Maximum Deformation / mm - Commercial Inner Shell - Maximum Deformation / mm - This Example 1 0.0007248 0.00025472 2 0.0012341 0.0009542 3 0.0006985 0.0003785 4 0.0005219 0.0004492 5 0.0007407 0.0004214 6 0.0004762 0.0003651

[0145] The maximum stress at the impact speed of 24 m / s is shown in Table 8 below:

[0146] Table 8

[0147]

[0148]

[0149] At the impact speed of 24 m / s, it can be seen from the maximum deformation data in Table 7 andFigure 21 From the maximum deformation data, the maximum deformation values of the inner shells of the baseball helmets on the market range from 0.0004762 mm to 0.0012341 mm, while the maximum deformation values of the inner shell of the protective helmet in this embodiment range from 0.0003651 mm to 0.0009542 mm. It can be clearly seen that at an impact speed of 24 m / s, the maximum deformation values of the inner shell of the protective helmet in this embodiment are lower than those of the inner shells of the baseball helmets on the market at all impact points, indicating that the inner shell of the protective helmet in this embodiment still has better deformation resistance at high-speed impact and can more effectively maintain its structural integrity. From the maximum stress data in Table 8 and Figure 20 From the maximum deformation data, the maximum deformation values of the inner shells of the baseball helmets on the market range from 0.0004762 mm to 0.0012341 mm, while the maximum deformation values of the inner shell of the protective helmet in this embodiment range from 0.0003651 mm to 0.0009542 mm. It can be clearly seen that at an impact speed of 24 m / s, the maximum deformation values of the inner shell of the protective helmet in this embodiment are lower than those of the inner shells of the baseball helmets on the market at all impact points, indicating that the inner shell of the protective helmet in this embodiment still has better deformation resistance at high-speed impact and can more effectively maintain its structural integrity. From the maximum stress data in Table 8 and

[0150] 6. Conclusion

[0151] Under different impact speeds (6 m / s, 12 m / s, 24 m / s), the inner shell of the protective helmet in this embodiment is significantly superior to the inner shells of the baseball helmets on the market in terms of maximum deformation and maximum stress. The maximum deformation values of the inner shell of the protective helmet in this embodiment are always smaller than those of the inner shells of the baseball helmets on the market, indicating that it has stronger deformation resistance and can better maintain the structural integrity of the helmet. At the same time, the maximum stress values of the inner shell of the protective helmet in this embodiment are also significantly lower than those of the inner shells of the baseball helmets on the market, indicating that it performs better in absorbing and dispersing impact force and can effectively reduce local stress concentration, thereby providing higher safety. Therefore, whether under low-speed or high-speed impact conditions, the inner shell of the protective helmet in this embodiment exhibits superior impact resistance and has better protection effect.

[0152] Example 2:

[0153] The inner shell of the protective helmet provided in this embodiment, as shown in Figure 22 , Figure 23 , Figure 24As shown, the shell 1 includes a forehead part 2, a crown part 3, a back of the head part 4 and two side parts 5, the front and rear ends of the crown part 3 are connected with the forehead part 2 and the back of the head part 4 respectively, the left and right ends of the crown part 3 are connected with the two side parts 5 respectively, the left and right ends of the forehead part 2 are connected with the two side parts 5 respectively, the left and right ends of the back of the head part 4 are connected with the two side parts 5 respectively, the angle α between the forehead part 2 and the horizontal plane is 86°; the outer surface of the forehead part 2 is a curved surface. The crown part 3 and the forehead part 2 are connected by a circular arc transition; the crown part 3 and the back of the head part 4 are connected by a circular arc transition; the crown part 3 and the side part 5 are connected by a circular arc transition; the forehead part 2 and the side part 5 are connected by a circular arc transition; the back of the head part 4 and the side part 5 are connected by a circular arc transition. The highest point of the connecting curved surface between the crown part 3 and the forehead part 2 is lower than the highest point of the connecting curved surface between the crown part 3 and the back of the head part 4. The angle α between the forehead part 2 and the horizontal plane is 86°, which can effectively improve the anti-deformation ability of the forehead part, and the effect of absorbing and dispersing the impact force is good; the outer surface of the forehead part 2 is a curved surface, which can effectively reduce local stress concentration. The side part 5 and the forehead part 2 form a cylindrical shape.

[0154] In order to improve the impact resistance of the side part 5, the angle δ between the side part 5 and the horizontal plane is 86°, which can effectively improve the anti-deformation ability of the crown part, and the effect of absorbing and dispersing the impact force is good; the angle δ between the side part 5 and the horizontal plane is the same as the angle α between the forehead part 2 and the horizontal plane; the outer surface of the side part 5 is a curved surface, which can effectively reduce local stress concentration.

[0155] In order to improve the impact resistance of the crown part 3, the angle β between the crown part 3 and the horizontal plane is 7.5°, which can effectively improve the anti-deformation ability of the crown part, and the effect of absorbing and dispersing the impact force is good; the outer surface of the crown part 3 is a curved surface, which can effectively reduce local stress concentration.

[0156] In order to improve the impact resistance of the back of the head part 4, the angle γ between the back of the head part 4 and the horizontal plane is 45°, which can effectively improve the anti-deformation ability of the crown part, and the effect of absorbing and dispersing the impact force is good; the outer surface of the back of the head part 4 is a curved surface, which can effectively reduce local stress concentration.

[0157] In order to adjust the size, the back of the head part 4 is provided with a notch 6. The design of the notch 6 can increase the deformation amount of the whole and improve the elasticity of the whole. When the notch 6 is under stress, it can contract inwardly or expand outwardly, so that the size of the inner shell can be adjusted, which is convenient for adapting to different head shapes and improving the wearing comfort. At the same time, the hair of female users can also be exposed from the notch 6, which is also convenient for the air permeation of the lower part of the inner shell.

[0158] In order to improve the structural strength, the shell 1 is made of carbon fiber composite material; the thickness of the shell 1 is 0.6mm-0.7mm, which is thin and has little influence on the installation in the hat. In this embodiment, the thickness of the shell 1 is 0.7mm.

[0159] In order to improve the air permeability, the side part 5 is provided with air permeable holes 7.

[0160] In order to improve the air permeability of the upper part of the inner shell, the air permeable holes 7 are located in the upper half of the shell 1, so that the lower part of the inner shell is ventilated through the cutout 6, and the upper part of the inner shell is ventilated through the air permeable holes 7, the overall ventilation effect is good, and when the user wears the hat, the hot air is also easy to accumulate on the top of the head, the air permeable holes 7 are arranged in the upper part, and the accumulated hot air can be discharged.

[0161] The impact experiment of the inner shell of the protective cap in the embodiment and the inner shell of the steel helmet type helmet on the market is as follows:

[0162] The inner shell of the protective cap in the embodiment and the inner shell of the steel helmet type helmet on the market both use anisotropic carbon fiber composite material, and the detailed parameters are as shown in Table 9:

[0163] Table 9

[0164]

[0165]

[0166] The impact body uses a ball with a diameter of 10 mm, and the material uses structural steel, and the detailed parameters are as shown in Table 10:

[0167] Table 10

[0168] Material Density (g / cm 3 )]]> Young's Modulus (Mpa) Poisson's Ratio Shear Modulus (Mpa) Structural Steel 7.85 200 0.3 76.92

[0169] As shown in Figure 25 , the angle between the top of the inner shell of the steel helmet type helmet on the market and the horizontal plane is 0°, the angle between the back of the head and the horizontal plane is 45°, and the angle between the forehead and the horizontal plane is 90°.

[0170] The specific steps are as follows:

[0171] 1. Calculate the working condition

[0172] The inner shell of the protective cap in the embodiment is fixed and supported inside, and is impacted and collided at eight positions as shown in Figure 26a - Figure 26e , the red dot is the impact force point, Figure 26a is impact point 1, Figure 26b from top to bottom are impact point 2 and impact point 3, Figure 26c is impact point 4, Figure 26d from top to bottom are impact point 5 and impact point 6, Figure 26eThe impact point 7 and the impact point 8 are sequentially arranged from top to bottom. Since the inner shell is a left-right symmetrical structure, the impact point 5 and the impact point 6 and the impact point 7 and the impact point 8 only need to be calculated two of them. Therefore, in the embodiment, only the data of the impact points 1-6 are calculated. The red impact force points are impacted by a ball with a diameter of 10 mm, and the impact speeds are 6 m / s, 12 m / s and 24 m / s, respectively, and three experiments are performed. The inner shell of the steel helmet type helmet on the market is also fixed and supported in this way, and eight impact positions are set for experiments.

[0173] 2. Mesh division

[0174] To ensure that the control variable is unique, the same mesh unit division method is used for the inner shell of the steel helmet type helmet on the market and the inner shell of the protective cap in the embodiment. At the same time, in order to realize fast and accurate calculation, the impact area is encrypted. Among them, the mesh division of the inner shell of the steel helmet type helmet on the market is as shown in Figure 27b , and the mesh division of the inner shell of the protective cap in the embodiment is as shown in Figure 27a .

[0175] 3. Constraints and load application

[0176] According to the calculation working condition requirements in step 1, constraints and loads are applied. In the embodiment, the calculation time is uniformly set to 0.005 s. In view of the large number of calculation working conditions, the constraint and load application diagram is not shown one by one. Taking the inner shell of the steel helmet type helmet on the market as an example, when the impact point 1 is impacted at a speed of 6 m / s, the constraint and load application is as shown in Figure 28 .

[0177] 4. Impact result analysis

[0178] 4.1, Taking the impact point 2 and the impact point 3 of the steel helmet type helmet on the market as examples

[0179] 4.11, Impact speed is 12 m / s

[0180] When the impact speed is 12 m / s, the deformation result and the stress result of the impact point 2 of the steel helmet type helmet on the market are as shown in Figure 29b and Figure 30b , and for the impact point 2, the maximum deformation is 0.00059603 mm, and the maximum stress is 3.1458 Mpa; as shown in Figure 29a and Figure 30a , for the impact point 3, the maximum deformation is 0.0010302 mm, and the maximum stress is 2.2799 Mpa.

[0181] 4.12, Impact speed is 24 m / s

[0182] The deformation and stress results of the impact point 2 of the inner shell of the protective cap in the embodiment at the impact speed of 12 m / s are shown in Figure 31b and Figure 32b The maximum deformation of the impact point 2 is 0.00033896 mm and the maximum stress is 1.1983 Mpa; the maximum deformation of the impact point 3 is 0.00047315 mm and the maximum stress is 1.8301 Mpa, as shown in Figure 31a and Figure 32a .

[0183] 4.2, the impact point 2 and the impact point 3 of the inner shell of the protective cap in the embodiment are illustrated at the impact speed of 12 m / s and 24 m / s

[0184] 4.21, the impact speed is 12 m / s

[0185] The deformation and stress results of the impact point 2 of the inner shell of the protective cap in the embodiment at the impact speed of 12 m / s are shown in Figure 33b and Figure 34b The maximum deformation of the impact point 2 is 0.00033896 mm and the maximum stress is 1.1983 Mpa; the maximum deformation of the impact point 3 is 0.00047315 mm and the maximum stress is 1.8301 Mpa, as shown in Figure 33a and Figure 34a .

[0186] 4.22, the impact speed is 24 m / s

[0187] The deformation and stress results of the impact point 2 of the inner shell of the protective cap in the embodiment at the impact speed of 24 m / s are shown in Figure 35b and Figure 36b The maximum deformation of the impact point 2 is 0.00058205 mm and the maximum stress is 2.3096 Mpa; the maximum deformation of the impact point 3 is 0.00052755 mm and the maximum stress is 2.4265 Mpa, as shown in Figure 35a and Figure 36a .

[0188] 5, comparative analysis

[0189] 5.1, the impact speed is 6 m / s

[0190] Under the condition that the impact speed is 6 m / s, the maximum deformation is as shown in Table 11:

[0191] Table 11

[0192]

[0193]

[0194] The maximum stress at the impact speed of 6 m / s is as follows in Table 12:

[0195] Table 12

[0196] Impact Point Inner Shell - Maximum Stress Mpa - Commercial Inner Shell - Maximum Stress Mpa - This Example 1 1.7516 1.5371 2 0.9740 0.6487 3 1.4711 1.4185 4 2.3883 1.8375 5 1.3652 1.1345 6 1.0966 0.7982

[0197] At the impact speed of 6 m / s, it can be seen from the maximum deformation data of Table 11 and Figure 38 The maximum deformation value of the inner shell of the protective cap in the present embodiment is always less than that of the steel helmet type helmet inner shell on the market, which shows that the inner shell of the protective cap in the present embodiment is obviously superior to the steel helmet type helmet inner shell on the market in terms of deformation resistance. At the same time, from the maximum stress data of Table 12 and Figure 37 The maximum stress of the inner shell of the protective cap in the present embodiment is also lower than that of the steel helmet type helmet inner shell on the market, which shows that the inner shell of the protective cap in the present embodiment can more effectively disperse the impact force and reduce local stress concentration.

[0198] 5.2, impact speed of 12 m / s

[0199] At the impact speed of 12 m / s, the maximum deformation is as follows in Table 13:

[0200] Table 13

[0201] Impact Point Inner Shell - Maximum Deformation / mm - Commercial Inner Shell - Maximum Deformation / mm - This Example 1 0.0014154 0.00061037 2 0.0005961 0.00033896 3 0.0010302 0.00047315 4 0.0005038 0.00037434 5 0.0006839 0.00048184 6 0.0009122 0.00029002

[0202] At the impact speed of 12 m / s, the maximum stress is as follows in Table 14:

[0203] Table 14

[0204] Impact Point Inner Shell - Maximum Stress Mpa - Commercial Inner Shell - Maximum Stress Mpa - This Example 1 1.9532 1.5965 2 3.1458 1.1983 3 2.2799 1.8301 4 2.8178 2.4157 5 1.8432 1.5304 6 1.6924 1.4876

[0205] At the impact speed of 12 m / s, it can be seen from the maximum deformation data of Table 13 and Figure 40 The maximum deformation value of the inner shell of the protective cap in the present embodiment is always less than that of the steel helmet type helmet inner shell on the market. This shows that the inner shell of the protective cap in the present embodiment has superior deformation resistance at high speed impact. From the maximum stress data of Table 14 and Figure 39 The maximum stress value of the inner shell of the protective cap in the present embodiment is also significantly lower than that of the steel helmet type helmet inner shell on the market, which shows that the inner shell of the protective cap in the present embodiment can more effectively disperse and withstand the impact force at high speed impact, reduce local stress concentration, and improve safety performance.

[0206] 5.3, impact speed of 24 m / s

[0207] At the impact speed of 24 m / s, the maximum deformation is as follows in Table 15:

[0208] Table 15

[0209] Impact Point Inner Shell - Maximum Deformation / mm - Commercial Inner Shell - Maximum Deformation / mm - This Example 1 0.0017359 0.0009155 2 0.0006648 0.0005822 3 0.0012821 0.0005275 4 0.0005569 0.0005113 5 0.0007271 0.0004962 6 0.0009468 0.0005615

[0210] At an impact speed of 24 m / s, the maximum stress is as shown in Table 16 below:

[0211] Table 16

[0212] Impact Point Inner Shell - Maximum Stress Mpa - Commercial Inner Shell - Maximum Stress Mpa - This Example 1 3.8597 2.3195 2 4.1732 2.3096 3 5.3343 2.4265 4 3.8442 3.6324 5 2.3491 1.8465 6 2.8477 1.8545

[0213] At an impact speed of 24 m / s, from the maximum deformation analysis of Table 15 and Figure 42 The maximum deformation value of the inner shell of the protective cap in this embodiment is significantly lower than that of the steel helmet type helmet inner shell on the market. This shows that at a higher impact speed, the inner shell of the protective cap in this embodiment performs better in terms of deformation resistance and can better maintain shape integrity. From the maximum stress analysis of Table 16 and Figure 41 The maximum stress value of the inner shell of the protective cap in this embodiment is also lower than that of the steel helmet type helmet inner shell on the market, which shows that the inner shell of the protective cap in this embodiment can more effectively disperse and withstand impact force at a higher impact speed, reduce local stress concentration, and improve safety performance.

[0214] 6. Conclusion

[0215] At different impact speeds (6 m / s, 12 m / s, 24 m / s), the inner shell of the protective cap in this embodiment is significantly better than the steel helmet type helmet inner shell on the market in terms of maximum deformation and maximum stress. The maximum deformation value of the inner shell of the protective cap in this embodiment is always less than that of the steel helmet type helmet inner shell on the market, indicating that it is stronger in deformation resistance and can better maintain the structural integrity of the helmet. At the same time, the maximum stress value of the inner shell of the protective cap in this embodiment is also significantly lower than that of the steel helmet type helmet inner shell on the market, indicating that it performs better in absorbing and dispersing impact force, effectively reducing local stress concentration, and thus providing higher safety. Therefore, whether in low speed or high speed impact conditions, the inner shell of the protective cap in this embodiment exhibits superior impact resistance and has better protection effect.

[0216] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. An inner shell of a protective hat, characterized in that, The application relates to a helmet (1) comprising a forehead part (2), a crown part (3), a back of the head part (4) and two side parts (5), the front and rear ends of the crown part (3) are connected with the forehead part (2) and the back of the head part (4) respectively, the left and right ends of the crown part (3) are connected with the two side parts (5) respectively, the left and right ends of the forehead part (2) are connected with the two side parts (5) respectively, the left and right ends of the back of the head part (4) are connected with the two side parts (5) respectively, and the included angle (alpha) between the forehead part (2) and a horizontal plane is 76-86 degrees.

2. An inner shell for a protective hat according to claim 1, characterized in that: The included angle (delta) between the side part (5) and a horizontal plane is 76-86 degrees; the included angle (delta) between the side part (5) and a horizontal plane is the same as the included angle (alpha) between the forehead part (2) and a horizontal plane.

3. An inner shell for a protective hat according to claim 1, characterized in that: The included angle (delta) between the side part (5) and a horizontal plane is 75+ / -3 degrees; the outer surface of the side part (5) is an arc surface.

4. An inner shell for a protective hat according to claim 1, wherein: The included angle (gamma) between the back of the head part (4) and a horizontal plane is 44+ / -0.5 degrees; the outer surface of the back of the head part (4) is an arc surface.

5. An inner shell for a protective hat according to claim 1, wherein: The included angle (beta) between the crown part (3) and a horizontal plane is 10+ / -2 degrees; the outer surface of the crown part (3) is an arc surface.

6. An inner shell for a protective hat according to claim 1, characterized in that: The included angle (gamma) between the back of the head part (4) and a horizontal plane is 45+ / -0.5 degrees; the outer surface of the back of the head part (4) is an arc surface.

7. An inner shell for a protective hat according to claim 1, characterized in that: The included angle (beta) between the crown part (3) and a horizontal plane is 7.5+ / -2 degrees; the outer surface of the crown part (3) is an arc surface.

8. An inner shell for a protective hat according to claim 1, characterized in that: The outer surface of the forehead part (2) is an arc surface; the side part (5) is provided with air holes (7).

9. An inner shell for a protective hat according to claim 1, characterized in that: The back of the head part (4) is provided with a notch (6).

10. An inner shell for a protective hat according to claim 1, characterized in that: The helmet (1) is made of carbon fiber composite material; the thickness of the helmet (1) is 0.6-0.7 mm.

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