Improved helmet

Abstract

The utility model discloses an improved helmet, including the shell, the shell inside cladding has the compound shock attenuation buffer layer, and the compound shock attenuation buffer layer is the segmented shock attenuation buffer structure formed by the fixed connection of shock attenuation buffer layer and EPP material layer, and the inside of EPP material layer is attached and is equipped with the inner lining, the utility model discloses a compound shock attenuation buffer layer that is composed of shock attenuation buffer layer and EPP material layer is set up, and EPP material layer covers at least one round edge of shock attenuation buffer layer opening, utilizes the characteristics that EPP material is soft and strong in shock resistance, can buffer the impact force when losing and putting, avoids the damage such as the concave or fracture of shock attenuation buffer layer edge, and also can reduce the direct friction and extrusion with the head through the self flexibility, and adopts the round angle of horizontal section, vertical section and connecting place of L type laminated structure, further reduces the contact discomfort, and significantly improves the wearing experience.

Description

Technical Field

[0001] This utility model relates to the field of cycling helmet technology, specifically an improved helmet. Background Technology

[0002] Commonly available helmets typically consist of an outer shell, a shock-absorbing layer, and an inner liner. The outer shell is often made of rigid materials such as ABS or PC, providing external protection. The shock-absorbing layer is usually a one-piece molded structure of EPS or TPU, primarily absorbing impact energy. The inner liner fits inside the shock-absorbing layer to improve wearing comfort. However, the treatment of the edge of the shock-absorbing layer opening in existing helmets is rather simplistic. It is either exposed and not covered by the outer shell or inner liner, or simply covered by the outer shell or inner liner. Therefore, it has the following drawbacks in practical use:

[0003] 1) When users carelessly throw away their helmets during daily use, the opening edges of the shock-absorbing buffer layer are prone to impact with hard objects such as tabletops or the ground, resulting in dents, scratches, wear and even breakage of the edges, affecting the structural integrity and service life of the helmet.

[0004] 2) When putting on or taking off the helmet, the inner edge of the opening of the shock-absorbing buffer layer directly rubs and squeezes the scalp. Especially when the helmet size is closely matched to the head, the friction and squeezing will be significantly enhanced, causing strong discomfort to the user and seriously affecting the wearing experience. Utility Model Content

[0005] The purpose of this invention is to provide an improved helmet to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an improved helmet, including an outer shell, the inner surface of which is covered with a composite shock-absorbing buffer layer, the composite shock-absorbing buffer layer being a segmented shock-absorbing buffer structure formed by a shock-absorbing buffer layer and an EPP material layer fixedly connected, and an inner lining is attached to the inner side of the EPP material layer;

[0007] The EPP material layer covers at least one edge of the opening of the shock-absorbing buffer layer and is used to buffer the impact force at the edge of the opening and reduce the frictional pressure with the head.

[0008] The lining is detachably connected to the EPP material layer. The edge of the lining is provided with an elastic edging that fits into the transition edge of the EPP material layer. The surface of the lining is provided with vent holes that form an air circulation path with the vent channels inside the EPP material layer.

[0009] The EPP material layer and the shock-absorbing buffer layer are fixed by bonding in sections. The edge area of ​​the contact surface is coated with environmentally friendly structural adhesive to form a sealing ring. Adhesive dots with a diameter of 3-5mm are set at intervals in the middle area. The sealing ring and adhesive dots are used to bond and fix the EPP material layer and the shock-absorbing buffer layer.

[0010] The EPP material layer is provided with a resilient pin with a barbed structure, the shock-absorbing buffer layer is provided with a slot adapted to the resilient pin, the edge of the EPP material layer is provided with an arc-shaped buckle, and the shock-absorbing buffer layer is provided with a groove adapted to the arc-shaped buckle. After the pin is inserted into the slot, the buckle and the groove engage and connect.

[0011] The EPP material layer has an L-shaped laminated structure. The EPP material layer includes a horizontal section that fits the inner side of the shock-absorbing buffer layer and a vertical section that wraps around the side edge of the shock-absorbing buffer layer. The horizontal section is 2-4mm thick and the vertical section is 1-3mm thick. The connection between the horizontal section and the vertical section is rounded.

[0012] The EPP material layer is embedded with multiple permanent magnet sheets, which are evenly distributed along the opening edge of the EPP material layer. The shock-absorbing buffer layer is embedded with multiple iron sheets that are compatible with the permanent magnet sheets. The permanent magnet sheets and the iron sheets are magnetically attracted to each other. The EPP material layer and the shock-absorbing buffer layer have a positioning boss in the middle of their contact surface. The shock-absorbing buffer layer has a positioning groove, and the boss is embedded in the positioning groove.

[0013] The EPP material layer facing the head has a flocked layer of 0.1-0.3mm and a breathable mesh film in sequence. The flocked layer is bonded to the EPP material layer with hot melt adhesive, and the edge of the breathable mesh film is sewn to the flocked layer. The mesh density of the breathable mesh film is 20-30 mesh.

[0014] The inner edge of the outer shell is provided with multiple evenly distributed protruding blocks, and the outer side of the composite shock-absorbing buffer layer is provided with a corresponding matching slot. After the blocks are inserted into the slots, the edge joints between the outer shell and the composite shock-absorbing buffer layer are sealed and fixed by ultrasonic welding.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) This utility model sets up a composite shock-absorbing buffer layer composed of a shock-absorbing buffer layer and an EPP material layer. The EPP material layer covers at least one edge of the opening of the shock-absorbing buffer layer. Utilizing the soft texture and strong impact resistance of EPP material, it can not only buffer the impact force when dropped, avoiding damage such as dents or breaks at the edge of the shock-absorbing buffer layer, but also reduce direct friction and pressure with the head through its own flexibility. The L-shaped layered structure with rounded corners at the horizontal and vertical sections and the connection points further reduces contact discomfort and significantly improves the wearing experience.

[0017] 2) This utility model can use EPP material layer and shock-absorbing buffer layer to be fixed by means of regional bonding, pin and buckle or magnetic positioning boss, etc., to ensure a stable connection and convenient assembly. The inner lining is attached to the transition edge of EPP material layer by elastic edge wrapping, and the ventilation holes are connected to the ventilation channel of EPP material layer, taking into account both comfort and breathability. The outer shell is fixed by the cooperation of the buckle and the ultrasonic welding to improve the overall structural stability. The multi-structure design realizes the synergistic optimization of helmet edge protection, wearing comfort and structural reliability, effectively solving the shortcomings of existing helmet technology. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the EPP material layer structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the inner lining structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the sealing ring structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0024] Figure 7 This is a schematic diagram of the structure of Embodiment 4 of this utility model;

[0025] Figure 8 This is a schematic diagram of the structure of Embodiment 5 of this utility model;

[0026] Figure 9 This is one of the structural schematic diagrams of Embodiment 5 of this utility model.

[0027] In the diagram: 100, outer shell; 110, raised latch; 200, composite shock-absorbing buffer layer; 210, shock-absorbing buffer layer; 211, slot; 212, card slot; 213, iron sheet; 214, positioning groove; 217, bayonet; 220, EPP material layer; 2201, horizontal section; 2202, vertical section; 2203, rounded corner; 221, elastic pin; 222, arc-shaped buckle; 223, permanent magnet sheet; 225, transition edge; 226, flocked layer; 227, breathable mesh membrane; 228, breathable channel; 229, positioning boss; 300, inner lining; 310, elastic edging; 320, ventilation hole; 330, Velcro; 400, environmentally friendly structural adhesive; 410, sealing ring; 420, adhesive dot. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] Please see Figure 1-4 The present invention provides a technical solution: an improved helmet, including an outer shell 100, the outer shell 100 being covered with a composite shock-absorbing buffer layer 200, the composite shock-absorbing buffer layer 200 being a segmented shock-absorbing buffer structure formed by a shock-absorbing buffer layer 210 and an EPP material layer 220 fixedly connected, and an inner liner 300 being attached to the inner side of the EPP material layer 220.

[0031] The EPP material layer 220 at least covers one edge of the opening of the shock-absorbing layer 210 and is used to cushion the impact force at the edge of the opening and reduce the frictional pressure with the head.

[0032] Specifically, the helmet shell 100, as the outermost structure, utilizes its rigid properties to directly resist the impact of external objects, initially dispersing the impact force and preventing the concentrated transmission of local impact force to the interior. Inside the shell 100 is a composite shock-absorbing buffer layer 200. The shock-absorbing buffer layer 210 of the composite shock-absorbing buffer layer 200 utilizes the energy-absorbing properties of its own material to further absorb the impact energy transmitted by the shell 100, reducing the energy transmission to the head. The EPP material layer 220, because it covers the edge of the opening of the shock-absorbing buffer layer 210, can not only buffer the impact force through its own flexibility when the edge of the shock-absorbing buffer layer 210 is subjected to external force, preventing the edge of the shock-absorbing buffer layer 210 from denting, wearing or breaking, but also reducing the direct contact friction between the shock-absorbing buffer layer 210 and the head. The inner liner 300, which is attached to the inside of the EPP material layer 220, further optimizes the wearing experience by isolating the EPP material layer 220 from the head skin through its own soft properties. The four-layer structure, from the outside to the inside, realizes the functions of "impact resistance, energy absorption, edge protection and comfort isolation", effectively solving the core defects of existing helmets.

[0033] In this embodiment: the inner liner 300 is detachably connected to the EPP material layer 220. The inner liner 300 has an elastic edge 310, which fits into the transition edge 225 of the EPP material layer 220. The inner liner 300 has ventilation holes 320 on its surface, which form an air circulation path with the ventilation channel 228 inside the EPP material layer 220.

[0034] Specifically, the detachable connection between the inner liner 300 and the EPP material layer 220 allows the inner liner 300 to be removed separately for cleaning or replacement, preventing residual dirt and sweat from breeding bacteria after long-term use and ensuring the hygiene of the helmet interior. The elastic edge 310 of the inner liner 300 has a certain degree of elasticity. During helmet wearing, the elastic edge 310 will fit tightly with the transition edge 225 of the EPP material layer 220, filling the gap between the inner liner 300 and the EPP material layer 220, and also cushioning the pressure of the inner liner 300 edge on the head through its own elasticity. Even if the helmet size matches the head height, it can avoid strong edge pressure discomfort.

[0035] The ventilation holes 320 on the surface of the inner liner 300 and the ventilation channels 228 inside the EPP material layer 220 form a continuous airflow channel. The heat and moisture generated by the head can enter the ventilation channels 228 through the ventilation holes 320 and then be discharged from the end of the ventilation channels 228 to the outside of the helmet, realizing air circulation inside the helmet and relieving stuffiness. The three work together to take into account hygiene, comfort and breathability.

[0036] In this embodiment: the EPP material layer 220 and the shock-absorbing buffer layer 210 are fixed by regional bonding. The edge area of ​​the contact surface is coated with environmentally friendly structural adhesive 400 to form a sealing ring 410. Adhesive dots 420 with a diameter of 3-5mm are set at intervals in the middle area. The sealing ring 410 and the adhesive dots are used to bond and fix the EPP material layer 220 and the shock-absorbing buffer layer 210.

[0037] Specifically, an environmentally friendly structural adhesive 400 is applied to the edge area of ​​the contact surface between the EPP material layer 220 and the shock-absorbing buffer layer 210 to form a sealing ring 410. The sealing ring 410 is distributed around the edge of the contact surface, which can effectively prevent external dust, rainwater, sweat and other impurities from entering the gap between the EPP material layer 220 and the shock-absorbing buffer layer 210, avoiding the accumulation of impurities that may lead to material aging and adhesion failure. At the same time, it enhances the connection and sealing of the edges of the two. Adhesive dots 420 with a diameter of 3-5mm are set at intervals in the middle area of ​​the contact surface, which achieve point bonding. The force between the EPP material layer 220 and the shock-absorbing buffer layer 210 is evenly distributed. When the helmet is impacted or vibrated, the impact force will be evenly transmitted to the shock-absorbing buffer layer 210 through multiple adhesive dots 420. This avoids excessive local stress that could cause the EPP material layer 220 to fall off or curl up. Compared with full-bonding adhesive, the method of "edge sealing and center spot bonding" can ensure the connection strength while retaining the flexibility of the EPP material layer 220. This also prevents the EPP material layer 220 from hardening due to excessive adhesive layer thickness, which would affect its edge protection and cushioning effect.

[0038] Example 2

[0039] Please refer to the detailed information. Figure 5The EPP material layer 220 is provided with a flexible pin 221 with a barbed structure, the shock-absorbing buffer layer 210 is provided with a slot 211 adapted to the flexible pin 221, the edge of the EPP material layer 220 is provided with an arc-shaped buckle 222, and the shock-absorbing buffer layer 210 is provided with a slot 212 adapted to the arc-shaped buckle 222. After the pin 221 is inserted into the slot 211, the buckle 222 and the slot 212 engage and connect.

[0040] Specifically, the barbed elastic pin 221 on the EPP material layer 220, when inserted into the slot 211 of the shock-absorbing buffer layer 210 during assembly, will have its barbs tightly engaged with the inner wall of the slot 211. The one-way locking characteristic of the barbs prevents the pin 221 from dislodging from the slot 211, achieving initial fixation. Simultaneously, the arc-shaped buckle 222 on the edge of the EPP material layer 220 engages with the slot 212 of the shock-absorbing buffer layer 210. The arc-shaped structure of the buckle 222 adapts to the inner wall of the slot 212. The arc shape, when engaged, forms a longitudinal limit, restricting the displacement of the EPP material layer 220 along the axial direction of the shock-absorbing buffer layer 210. When the helmet is subjected to lateral impact or severe vibration, the elastic pin 221 can resist lateral tension, while the arc-shaped buckle 222 can resist longitudinal thrust. The dual fixing structure works together to prevent relative displacement between the EPP material layer 220 and the shock-absorbing buffer layer 210. Moreover, the mechanical fixing method does not rely on adhesive curing, making it easy to install and remove. When the EPP material layer 220 is damaged, it can be directly disassembled and replaced, reducing maintenance costs.

[0041] Example 3

[0042] Please refer to the detailed information. Figure 6 The EPP material layer 220 has an L-shaped laminated structure. The EPP material layer 220 includes a horizontal section 2201 that fits the inner side of the shock-absorbing buffer layer 210 and a vertical section 2202 that wraps the side edge of the shock-absorbing buffer layer 210. The horizontal section 2201 has a thickness of 2-4mm, the vertical section 2202 has a thickness of 1-3mm, and the connection between the horizontal section 2201 and the vertical section 2202 is provided with a rounded corner 2203.

[0043] Specifically, the horizontal section 2201 of the EPP material layer 220 is attached to the inner side of the shock-absorbing buffer layer 210. Its 2-4mm thickness enhances the softness of the inner side of the shock-absorbing buffer layer 210 without increasing the overall weight of the helmet, reducing direct contact between the shock-absorbing buffer layer 210 and the head, and also helps absorb minor impact forces between the head and the helmet. The vertical section 2202 wraps around the side edge of the shock-absorbing buffer layer 210, with a thickness of 1-3mm, directly covering the side edge of the shock-absorbing buffer layer 210. When the helmet is impacted from the side... When in contact with hard objects, the vertical section 2202 will contact the external force before the shock-absorbing buffer layer 210. It will buffer the impact force through its own flexibility, avoiding wear or breakage on the side edge of the shock-absorbing buffer layer 210. The rounded corner 2203 set at the connection between the horizontal section 2201 and the vertical section 2202 can eliminate the sharp edges of the connection between the two. When wearing, the rounded corner 2203 will not hook or rub against the scalp or hair. At the same time, during the process of taking off and removing the helmet, the rounded corner 2203 can guide the head to enter and exit smoothly, avoiding edge jamming, effectively improving the performance of the helmet.

[0044] Example 4

[0045] Please refer to the detailed information. Figure 7 The EPP material layer 220 has multiple permanent magnet sheets 223 embedded inside, and the multiple permanent magnet sheets 223 are evenly distributed along the opening edge of the EPP material layer 220. The shock-absorbing buffer layer 210 has multiple iron sheets 213 that are adapted to the permanent magnet sheets 223 embedded inside. The permanent magnet sheets 223 and the iron sheets 213 are magnetically attracted to each other. A positioning boss 229 is provided in the middle of the contact surface between the EPP material layer 220 and the shock-absorbing buffer layer 210. The shock-absorbing buffer layer 210 has a positioning groove 214, and the boss 229 is embedded inside the positioning groove 214.

[0046] Specifically, the multiple permanent magnets 223 embedded inside the EPP material layer 220 correspond one-to-one with the multiple iron pieces 213 embedded inside the shock-absorbing buffer layer 210. During assembly, the two will generate a magnetic attraction force, which can automatically attract the EPP material layer 220 to the preset position of the shock-absorbing buffer layer 210 without the need for precise manual alignment, simplifying the assembly process. At the same time, the positioning boss 229 set in the middle of the contact surface between the EPP material layer 220 and the shock-absorbing buffer layer 210 is embedded in the positioning groove 214 of the shock-absorbing buffer layer 210 to form a mechanical positioning, which restricts the relative displacement of the two in the horizontal direction, ensuring that the permanent magnets 223 and the iron pieces 213 correspond precisely and avoid uneven force caused by magnetic misalignment.

[0047] During use, the magnetic attraction between the permanent magnet 223 and the iron sheet 213 can help enhance the connection stability. When the helmet is subjected to slight vibration, the magnetic attraction can prevent gaps from appearing between the EPP material layer 220 and the shock-absorbing buffer layer 210, ensuring that the EPP material layer 220 always tightly covers the opening edge of the shock-absorbing buffer layer 210 and continuously plays the role of edge protection. The cooperation between the positioning boss 229 and the positioning groove 214 can also keep the two in a fixed position when applying adhesive for reinforcement, avoiding displacement during the curing process of the adhesive.

[0048] Example 5

[0049] Please refer to the detailed information. Figure 8-9 The EPP material layer 220 has a flocked layer 226 of 0.1-0.3mm and a breathable mesh 227 on the surface facing the head. The flocked layer 226 is bonded to the EPP material layer 220 with hot melt adhesive. The edge of the breathable mesh 227 is sewn to the flocked layer 226 and fixed. The mesh density of the breathable mesh 227 is 20-30 mesh.

[0050] Specifically, a 0.1-0.3mm thick flocked layer 226 is set on the surface of the head with the EPP material layer 220. It is tightly bonded to the EPP material layer 220 with hot melt adhesive. The flocked layer 226 has a soft and delicate pile structure that can directly contact the skin of the head, which greatly reduces the friction coefficient between the surface of the EPP material layer 220 and the skin. Even if worn for a long time, it can prevent the skin from redness and stinging due to friction.

[0051] The breathable mesh 227, which is sewn and fixed to the outside of the flocked layer 226, has a mesh density of 20-30 mesh. This ensures smooth airflow while preventing dust or hair from entering the flocked layer 226, thus preventing the flocked layer 226 from becoming dirty and difficult to clean. The sewing and fixing method of the breathable mesh 227 prevents it from shifting during wearing or removal, ensuring that it remains in close contact with the flocked layer 226 even after long-term use. Sweat and heat generated by the head can pass through the mesh of the breathable mesh 227 and the gaps between the fibers of the flocked layer 226, and then enter the breathable channel 228 of the EPP material layer 220 to be discharged, improving the comfort of wearing for a long time.

[0052] In this embodiment: the inner edge of the outer shell 100 is provided with a plurality of evenly distributed protruding blocks 110, and the outer side of the shock-absorbing buffer layer 210 of the composite shock-absorbing buffer layer 200 is provided with a corresponding matching slot 217. After the block 110 is inserted into the slot 217, the edge joint between the outer shell 100 and the composite shock-absorbing buffer layer 200 is sealed and fixed by ultrasonic welding.

[0053] Specifically, during helmet assembly, the snap 217 on the outer side of the shock-absorbing buffer layer 210 embedded in the composite shock-absorbing buffer layer 200 complements the shape of the snap block 110, forming a mechanical engagement. This initially restricts the relative displacement of the outer shell 100 and the composite shock-absorbing buffer layer 200 in the radial and axial directions, preventing them from loosening during slight vibrations. Then, the edge seams of the outer shell 100 and the composite shock-absorbing buffer layer 200 are sealed by ultrasonic welding. During the welding process, the ultrasonic energy causes the edge material of the outer shell 100 and the shock-absorbing buffer layer 210 to melt locally. After cooling, an integrated sealing structure is formed, which not only eliminates the gaps at the seams and prevents dust or rainwater from entering the helmet, but also evenly transmits the force of the outer shell 100 to the composite shock-absorbing buffer layer 200.

[0054] When the helmet is subjected to a severe impact, the outer shell 100 first bears the impact force and then distributes the force to the entire composite shock-absorbing buffer layer 200 through the locking block 110 and the welded seam, so as to avoid excessive local stress that could cause the outer shell 100 to fall off, and effectively ensure the overall impact resistance of the helmet.

[0055] The contents not described in detail in this description are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An improved helmet, characterized in that: Includes an outer shell (100), the inner part of which is covered with a composite shock-absorbing buffer layer (200). The composite shock-absorbing buffer layer (200) is a segmented shock-absorbing buffer structure formed by a shock-absorbing buffer layer (210) and an EPP material layer (220) fixedly connected. An inner liner (300) is attached to the inner side of the EPP material layer (220). The EPP material layer (220) at least covers one edge of the opening of the shock-absorbing buffer layer (210) and is used to buffer the impact force of the opening edge and reduce the frictional pressure with the head.

2. An improved helmet according to claim 1, characterized in that: The lining (300) is detachably connected to the EPP material layer (220). The edge of the lining (300) is provided with an elastic edging (310). The elastic edging (310) is fitted with the transition edge (225) of the EPP material layer (220). The surface of the lining (300) is provided with a vent hole (320). The vent hole (320) and the vent channel (228) inside the EPP material layer (220) form an air circulation path.

3. An improved helmet according to claim 1, characterized in that: The EPP material layer (220) and the shock-absorbing buffer layer (210) are fixed by bonding in sections. The edge area of ​​the contact surface is coated with environmentally friendly structural adhesive (400) to form a sealing ring (410). Adhesive dots (420) with a diameter of 3-5mm are set at intervals in the middle area. The sealing ring (410) and the adhesive dots are used to bond and fix the EPP material layer (220) and the shock-absorbing buffer layer (210).

4. An improved helmet according to claim 1, characterized in that: The EPP material layer (220) is provided with a flexible pin (221) with a barbed structure. The shock-absorbing buffer layer (210) is provided with a slot (211) adapted to the flexible pin (221). The edge of the EPP material layer (220) is provided with an arc-shaped buckle (222). The shock-absorbing buffer layer (210) is provided with a slot (212) adapted to the arc-shaped buckle (222). After the pin (221) is inserted into the slot (211), the buckle (222) engages with the slot (212).

5. An improved helmet according to claim 1, characterized in that: The EPP material layer (220) has an L-shaped laminated structure. The EPP material layer (220) includes a horizontal section (2201) that fits the inner side of the shock-absorbing buffer layer (210) and a vertical section (2202) that wraps the side edge of the shock-absorbing buffer layer (210). The horizontal section (2201) has a thickness of 2-4 mm, the vertical section (2202) has a thickness of 1-3 mm, and the connection between the horizontal section (2201) and the vertical section (2202) is provided with a rounded corner (2203).

6. An improved helmet according to claim 1, characterized in that: The EPP material layer (220) is embedded with a plurality of permanent magnet sheets (223), which are evenly distributed along the opening edge of the EPP material layer (220). The shock-absorbing buffer layer (210) is embedded with a plurality of iron sheets (213) adapted to the permanent magnet sheets (223). The permanent magnet sheets (223) and the iron sheets (213) are magnetically attracted to each other. The EPP material layer (220) and the shock-absorbing buffer layer (210) have a positioning boss (229) in the middle of the contact surface. The shock-absorbing buffer layer (210) has a positioning groove (214), and the boss (229) is embedded in the positioning groove (214).

7. An improved helmet according to claim 1, characterized in that: The EPP material layer (220) facing the head is provided with a flocked layer (226) of 0.1-0.3mm and a breathable mesh (227) in sequence. The flocked layer (226) is bonded to the EPP material layer (220) by hot melt adhesive. The edge of the breathable mesh (227) is sewn and fixed to the flocked layer (226). The mesh density of the breathable mesh (227) is 20-30 mesh.

8. An improved helmet according to claim 1, characterized in that: The inner edge of the outer shell (100) is provided with a plurality of evenly distributed protruding blocks (110), and the outer side of the shock-absorbing buffer layer (210) of the composite shock-absorbing buffer layer (200) is provided with a matching slot (217). After the block (110) is inserted into the slot (217), the edge joint between the outer shell (100) and the composite shock-absorbing buffer layer (200) is sealed and fixed by ultrasonic welding.

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