A multi-functional safety helmet

Abstract

This invention belongs to the field of safety helmet technology, specifically disclosing a multifunctional safety helmet, including a shell, an inner shell, a cushioning and warning component, a tightening strap, and an assistive dustproof breathing device. This invention achieves active protection and team early warning without energy consumption by automatically sounding an alarm when a falling object hits the helmet through a purely mechanical impact alarm mechanism; it also innovatively recovers and reuses exhaled energy, significantly reducing inhalation resistance and improving comfort during extended wear through an exhalation-energy storage and inhalation-energy release assistive method. The entire system is compact, requires no external power supply, and is safe and reliable. While ensuring head protection, it simultaneously solves the industry pain points of traditional dust masks, such as difficulty breathing and the inability to provide timely warnings after an accident, demonstrating high inventiveness and practicality.

Description

Technical Field

[0001] This invention belongs to the field of safety helmet technology, specifically referring to a multi-functional safety helmet. Background Technology

[0002] Safety helmets are essential personal protective equipment for ensuring the head safety of workers in high-risk environments such as construction, mining, and tunneling. Traditional safety helmets mainly consist of a shell and a liner, with their core function being to cushion and disperse the impact of falling objects on the head, preventing or mitigating direct head injury. However, in actual work scenarios, when a worker is struck by a falling object, they may temporarily lose consciousness or mobility due to the impact, making it impossible to send out a distress signal in time. Simultaneously, other workers nearby may fail to notice the accident immediately due to obstructed vision, distraction, or other work commitments, thus delaying valuable rescue opportunities and potentially causing secondary injuries due to failure to avoid the object in time. Therefore, existing safety helmets lack an effective, automated on-site warning mechanism.

[0003] Furthermore, in many high-dust-concentration work environments (such as coal mines, quarries, and grinding workshops), workers must wear both safety helmets and dust masks. Existing dust masks, especially self-priming filter masks, rely entirely on the wearer's respiratory muscles to overcome the resistance of the filter material. Prolonged work under high breathing resistance significantly increases the worker's respiratory load, leading to increased fatigue, decreased work efficiency, and potentially triggering health problems caused by hypoxia or excessive respiratory muscle strain. While electrically powered breathing apparatuses exist, they require external power sources such as batteries and motors, resulting in issues such as heavy weight, limited battery life, high maintenance costs, and safety hazards in flammable and explosive environments. How to effectively reduce the inhalation resistance of dust masks and improve wearing comfort without relying on external power sources is another pressing issue that needs to be addressed in current technology. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a multifunctional safety helmet. This invention utilizes a purely mechanical impact alarm mechanism to automatically sound an alarm when a falling object strikes, achieving active protection and team early warning without requiring energy. Furthermore, it innovatively recovers and reuses exhaled energy, significantly reducing inhalation resistance and improving comfort during extended wear through an exhalation-energy storage and inhalation-energy release mechanism. The entire system is compact, requires no external power supply, and is safe and reliable. While ensuring head protection, it simultaneously solves the industry pain points of traditional dust masks, such as difficulty breathing and the inability to provide timely warnings after an accident, demonstrating high creativity and practicality.

[0005] The technical solution adopted by this invention is as follows: This invention provides a multifunctional safety helmet, including a helmet shell, an inner shell, a cushioning and reminder component, a tightening strap, and an assisted dustproof breathing device. The inner shell is disposed inside the helmet shell, the cushioning and reminder component is disposed on the helmet shell and the inner shell, the tightening strap is disposed on the cushioning and reminder component, and the assisted dustproof breathing device is disposed on the helmet shell. The cushioning and reminder component includes a movable cushioning arc plate, a cushioning spring, a trigger post, and a triggering reminder component. The movable cushioning arc plate is engaged and slidably disposed in the inner shell, the cushioning spring is disposed on the upper surface of the movable cushioning arc plate, and the trigger post is disposed at the center of the upper surface of the movable cushioning arc plate.

[0006] Furthermore, the triggering reminder includes a striking rod, a return spring, a limiting ring plate, and a bell. The limiting ring plate is located on the upper inner wall of the cap shell. The striking rod is slidably telescopically disposed within the limiting ring plate. The striking rod has a limiting protrusion. The return spring is sleeved on the outside of the striking rod and is located between the limiting protrusion and the limiting ring plate. The bell is located on the upper inner wall of the cap shell.

[0007] Preferably, the end of the striking rod near the trigger post is a beveled surface, the upper end of the trigger post is a beveled surface, the beveled surface of the striking rod matches the beveled surface of the trigger post, and the striking rod is positioned above the trigger post.

[0008] Furthermore, the movable buffer arc plate is provided with locking blocks at both ends, and the inner shell is provided with locking grooves on its two opposite inner sidewalls. The movable buffer arc plate is slidably disposed in the locking grooves by locking the locking blocks.

[0009] The assisted dustproof breathing device includes a dust mask, a protective cylinder, an exhalation component, and an inhalation assist component. The cap shell has clamps on both sides, the protective cylinder is snapped into the clamps, the exhalation component is located in the protective cylinder, the inhalation assist component is located in the protective cylinder, and the dust mask is connected to the exhalation component and the inhalation assist component respectively.

[0010] Furthermore, the dust mask includes a mask body, an exhalation valve, and a dust-filtering inhalation valve. The exhalation valve is located at the center of the outer side of the mask body, and the dust-filtering inhalation valves are symmetrically located on both sides of the mask body. The mask body has wearing holes, and elastic straps are detachably installed in the wearing holes to fix the mask body to the face.

[0011] As a further preferred embodiment of the present invention, the exhalation assembly includes an exhalation transmission tube, an exhalation inlet check valve, an exhalation outlet check valve, an exhalation canister, an exhalation piston, and an exhalation piston rod. The exhalation canister is disposed in a protective cylinder. The upper two side walls of the exhalation canister are provided with an exhalation inlet and an exhalation outlet. The exhalation inlet check valve is disposed in the exhalation inlet, and the exhalation outlet check valve is disposed in the exhalation outlet. The exhalation piston is movably disposed in the exhalation canister. The exhalation piston rod passes through the exhalation canister and is connected to the exhalation piston. One end of the exhalation transmission tube is connected to the exhalation inlet check valve, and the other end of the exhalation transmission tube is connected in a through connection to the exhalation valve. The exhalation assembly is provided in two sets.

[0012] Furthermore, the suction assist assembly includes a suction assist transmission pipe, a suction inlet check valve, a suction assist check valve, a suction canister, a suction piston, a suction piston rod, and an assist spring. The suction canister is housed in a protective cylinder. Suction inlets and suction assist ports are located on the lower two side walls of the suction canister. The suction inlet check valve is located in the suction inlet, and the suction assist check valve is located in the suction assist port. The suction piston is movably disposed within the suction canister. The suction piston rod passes through the suction canister and is connected to the suction piston. The assist spring is located between the suction piston and the bottom wall of the suction canister. One end of the suction assist transmission pipe is connected to the suction assist check valve, and the other end of the suction assist transmission pipe is connected in a through-flow manner to the dust filter suction valve. Two sets of suction assist assemblies are provided.

[0013] The protective cylinder is equipped with a rotatable linkage lever, and the bottom wall of the linkage lever is provided with an embedded cavity. The upper ends of the exhalation piston rod and the inhalation piston rod are respectively provided with embedded balls, which are slidably embedded in the embedded cavity.

[0014] Furthermore, the exhalation inlet one-way valve includes a fixed shell, a sealing plate, a perforated limiting plate, a support plate, and a spring. The fixed shell is disposed in the exhalation inlet, the perforated limiting plate is disposed in the fixed shell, the support plate is disposed in the fixed shell, the sealing plate is movably disposed in the fixed shell, and the perforated limiting plate limits the sealing plate. One end of the spring is disposed on the support plate, and the other end of the spring passes through the perforated limiting plate and is connected to the sealing plate. The structure of the exhalation outlet one-way valve is the same as that of the exhalation inlet one-way valve, only the direction is reversed. The structure of the inhalation inlet one-way valve is the same as that of the exhalation inlet one-way valve, and the structure of the inhalation assist one-way valve is the same as that of the exhalation outlet one-way valve.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: 1. Integrated warning function to improve workplace safety: This invention uses a mechanical impact alarm mechanism consisting of a trigger post, a striking rod, and a bell. When the cap is struck by a heavy object and moves downward, the buffer spring is compressed, the trigger post moves upward and pushes the striking rod, thereby automatically striking the bell to sound an alarm. This mechanism requires no electronic components or external power source, is reliable, and can automatically issue an audible and visual alarm immediately after a worker is hit. This effectively reminds nearby workers to check on the injured person and avoid potential hazards, transforming passive protection into proactive warning, significantly improving the overall emergency response speed and team safety level on site. 2. Innovative Breathing Assist Mechanism Reduces Breathing Load: This invention innovatively designs an assisted dustproof breathing device, which differs from traditional passive respiratory protection devices. This mechanism cleverly recovers and utilizes the energy of the wearer's exhaled air. Through the synergistic action of components such as the exhalation piston, exhalation canister, linkage lever, inhalation piston, inhalation canister, and assist spring, a closed-loop system of exhalation energy storage and inhalation energy release is formed. Specifically, when the worker exhales, it drives the exhalation piston to move downward, transferring energy to the inhalation piston through the linkage lever and stretching the assist spring; when inhaling, the assist spring contracts and releases energy, driving the inhalation piston to move downward, forcing the pre-stored gas into the dust filter inhalation valve through the inhalation assist one-way valve, actively assisting the wearer in inhalation. 3. Improved comfort and reduced work fatigue: Through the above-mentioned assistive mechanism, the present invention effectively utilizes the energy of exhaled breathing during human respiration to assist inhalation without the need for an external power source. This overcomes the shortcomings of traditional dust masks that rely solely on the wearer's muscle strength to overcome inhalation resistance. This directly reduces the workload on the respiratory muscles during inhalation, lowers the feeling of breathing resistance, and makes wearing the mask for extended periods more effortless and comfortable. It helps to delay the onset of work fatigue and improve work efficiency and wearing compliance. 4. Purely mechanical structure, safe and reliable: The entire alarm device and breathing assist device are designed with a purely mechanical structure, without involving any electronic circuits or chemical batteries. This fundamentally eliminates the risk of safety accidents caused by electric sparks in flammable and explosive environments such as coal mines and chemical plants. At the same time, the purely mechanical structure also means higher environmental adaptability, lower failure rate and longer service life. No charging or battery replacement is required, maintenance is simple and operating costs are low. 5. Simple operation and easy to promote and apply: The invention has a compact structure and a high degree of integration with safety helmets and dust masks. It does not change the user's original wearing habits. In actual use, you only need to wear it normally and tighten it, and it will automatically enter the working state. The above steps can be repeated next time. No additional training or complicated operation is required, and it has good market application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a multifunctional safety helmet proposed in this invention; Figure 2 This is a left view of a multifunctional safety helmet proposed in this invention; Figure 3 This is a front view of a multifunctional safety helmet proposed in this invention; Figure 4 This is a top view of a multifunctional safety helmet proposed in this invention; Figure 5 This is a bottom view of a multifunctional safety helmet proposed in this invention; Figure 6 This is a schematic cross-sectional view of a multifunctional safety helmet proposed in this invention. Figure 1 ; Figure 7 This is a schematic cross-sectional view of a multifunctional safety helmet proposed in this invention. Figure 2 ; Figure 8 A schematic diagram of the structure for triggering the reminder; Figure 9 This is a schematic diagram of the buffer reminder component. Figure 10 A schematic diagram of the structure of a power-assisted dustproof breathing device; Figure 11 A schematic diagram of the cross-sectional structure of a power-assisted dustproof breathing device; Figure 12 for Figure 11 A magnified view of part A in the middle; Figure 13 A schematic diagram of the structure of the one-way valve for exhaled air; Figure 14 A schematic diagram of the back structure for exhaling into the one-way valve; Figure 15 This is a cross-sectional schematic diagram of the one-way valve for exhaled air.

[0017] The components include: 1. Cap shell; 2. Inner shell; 3. Cushioning and reminder assembly; 4. Tightening strap; 5. Assisted dustproof breathing device; 6. Movable cushioning arc plate; 7. Cushioning spring; 8. Trigger post; 9. Triggering and reminder device; 10. Striking rod; 11. Return spring; 12. Limiting ring plate; 13. Bell; 14. Limiting flange; 15. Locking block; 16. Locking groove; 17. Dustproof face mask; 18. Protective sleeve; 19. Exhalation assembly; 20. Inhalation assist assembly; 21. Clamp; 22. Face mask body; 23. Exhalation valve; 24. Dust filter inhalation valve; 25. Wearing hole; 26. Elastic strap; 27. Exhalation transmission tube. 28. Exhalation inlet check valve; 29. ​​Exhalation outlet check valve; 30. Exhalation canister; 31. Exhalation piston; 32. Exhalation piston rod; 33. Exhalation inlet; 34. Exhalation outlet; 35. Inhalation assist transmission tube; 36. Inhalation inlet check valve; 37. Inhalation assist check valve; 38. Inhalation canister; 39. Inhalation piston; 40. Inhalation piston rod; 41. Assist spring; 42. Inhalation inlet; 43. Inhalation assist port; 44. Linkage lever; 45. Embedded cavity; 46. Embedded ball; 47. Fixed shell; 48. Sealing plate; 49. Hollowed-out limit plate; 50. Support plate; 51. Spring.

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] like Figures 1-15 As shown, the present invention provides a multifunctional safety helmet, including a helmet shell 1, an inner shell 2, a cushioning and reminder component 3, a tightening strap 4, and an assisted dustproof breathing device 5. The inner shell 2 is disposed inside the helmet shell 1, the cushioning and reminder component 3 is disposed on the helmet shell 1 and the inner shell 2, the tightening strap 4 is disposed on the cushioning and reminder component 3, and the assisted dustproof breathing device 5 is disposed on the helmet shell 1.

[0022] The buffer reminder assembly 3 includes a movable buffer arc plate 6, a buffer spring 7, a trigger post 8, and a trigger reminder component 9. The movable buffer arc plate 6 is slidably engaged within the inner shell 2. The buffer spring 7 is located on the upper surface of the movable buffer arc plate 6, and the trigger post 8 is located at the center of the upper surface of the movable buffer arc plate 6. The trigger reminder component 9 includes a striking rod 10, a return spring 11, a limiting ring plate 12, and a bell 13. The limiting ring plate 12 is located on the upper inner wall of the cap shell 1. The striking rod 10 is slidably extended within the limiting ring plate 12 and has a limiting flange 14. The return spring 11... The striking rod 10 is sleeved on the outside of the striking rod 10. The return spring 11 is located between the limiting flange 14 and the limiting ring plate 12. The bell 13 is swaying on the upper inner wall of the cap shell 1. The striking rod 10 has a beveled end near the trigger post 8 and the upper end of the trigger post 8 has a beveled end. The beveled end of the striking rod 10 matches the beveled end of the trigger post 8. The striking rod 10 is located above the trigger post 8. The movable buffer arc plate 6 has locking blocks 15 at both ends. The inner shell 2 has locking grooves 16 on two opposite inner sidewalls. The movable buffer arc plate 6 is slidably engaged in the locking grooves 16 by the locking blocks 15.

[0023] The assisted dust respirator 5 includes a dust mask 17, a protective cylinder 18, an exhalation assembly 19, and an inhalation assist assembly 20. Clamps 21 are provided on both sides of the helmet shell 1. The protective cylinder 18 is snapped into the clamps 21. The exhalation assembly 19 and the inhalation assist assembly 20 are located within the protective cylinder 18. The dust mask 17 is connected to both the exhalation assembly 19 and the inhalation assist assembly 20. The dust mask 17 includes a mask body 22, an exhalation valve 23, and a dust-filtering inhalation valve 24. The exhalation valve 23 is located at the center of the outer side of the mask body 22, and the dust-filtering inhalation valves 24 are symmetrically arranged on both sides of the mask body 22. The mask body 22 has wearing holes. 25. An elastic strap 26 is detachably installed in the wearing hole 25 to fix the mask body 22 to the face; the exhalation assembly 19 includes an exhalation transmission tube 27, an exhalation inlet one-way valve 28, an exhalation outlet one-way valve 29, an exhalation canister 30, an exhalation piston 31, and an exhalation piston rod 32. The exhalation canister 30 is located in the protective cylinder 18. The upper two side walls of the exhalation canister 30 are provided with an exhalation inlet 33 and an exhalation outlet 34. The exhalation inlet one-way valve 28 is located in the exhalation inlet 33, and the exhalation outlet one-way valve 29 is located in the exhalation outlet 34. The exhalation piston 31 is movably installed in the exhalation canister 30, and the exhalation piston rod 32 passes through the exhalation canister 30 and the exhalation piston. 31 is connected; one end of the exhalation transmission tube 27 is connected to the exhalation inlet check valve 28, and the other end of the exhalation transmission tube 27 is connected to the exhalation valve 23; the exhalation assembly 19 is provided with two sets; the inhalation assist assembly 20 includes an inhalation assist transmission tube 35, an inhalation inlet check valve 36, an inhalation assist check valve 37, an inhalation canister 38, an inhalation piston 39, an inhalation piston rod 40, and an assist spring 41. The inhalation canister 38 is located in the protective cylinder 18. The lower end of the inhalation canister 38 has an inhalation inlet 42 and an inhalation assist port 43 on both sides. The inhalation inlet check valve 36 is located in the inhalation inlet 42, and the inhalation assist check valve 37 is located in the inhalation assist port 43. The suction piston 39 is movably disposed in the suction tank 38. The suction piston rod 40 passes through the suction tank 38 and is connected to the suction piston 39. The assist spring 41 is disposed between the suction piston 39 and the bottom wall of the suction tank 38. One end of the suction assist transmission pipe 35 is connected to the suction assist one-way valve 37, and the other end of the suction assist transmission pipe 35 is connected to the dust filter suction valve 24. The suction assist assembly 20 is provided with two sets. The protective cylinder 18 is rotatably provided with a linkage lever 44. The bottom wall of the linkage lever 44 is provided with an embedded cavity 45. The upper ends of the exhalation piston rod 32 and the inhalation piston rod 40 are respectively provided with embedded balls 46, which are slidably embedded in the embedded cavity 45.The exhalation inlet one-way valve 28 includes a fixed housing 47, a sealing plate 48, a perforated limiting plate 49, a support plate 50, and a spring 51. The fixed housing 47 is located in the exhalation inlet 33, the perforated limiting plate 49 is located in the fixed housing 47, the support plate 50 is located in the fixed housing 47, the sealing plate 48 is movably located in the fixed housing 47, and the perforated limiting plate 49 limits the sealing plate 48. One end of the spring 51 is located on the support plate 50, and the other end of the spring 51 passes through the perforated limiting plate 49 and is connected to the sealing plate 48. The structure of the exhalation outlet one-way valve 29 is the same as that of the exhalation inlet one-way valve 28, only the direction is reversed. The structure of the inhalation inlet one-way valve 36 is the same as that of the exhalation inlet one-way valve 28, and the structure of the inhalation assist one-way valve 37 is the same as that of the exhalation outlet one-way valve 29.

[0024] In practical use, the safety helmet is worn on the head and tightened with the strap 4. Then, the dust mask 17 is worn on the face with the elastic strap 26, ensuring a close fit. When a heavy object falls on the helmet shell 1, the helmet shell 1 moves downward, the buffer spring 7 contracts, and the trigger pin 8 moves upward relative to the helmet shell 1. The upward movement of the trigger pin 8 pushes the striking rod 10 to move closer to the bell 13, striking the bell 13 and making it ring. This alerts nearby workers, allowing them to check if the person hit is injured and to warn others to take precautions. The assisted dust respirator 5 uses the worker's exhaled air to assist inhalation, reducing inhalation resistance and further improving worker comfort. The worker's exhaled air is transmitted through the exhalation valve 23 to the exhalation transmission pipe 27, and then through the exhalation transmission pipe 27 to the exhalation inlet one-way valve 28. At this time, the spring 51 extends, and the sealing plate 48 moves away from the perforated limit. At this time, the channel of the fixed shell 47 is opened, and the exhaled gas enters the one-way valve 28 through the exhalation and is transmitted to the exhalation canister 30. At this time, the exhalation piston 31 is pressed down and moves down, which drives the exhalation piston rod 32 to move down. The downward movement of the exhalation piston rod 32 drives the linkage lever 44 to move down. The downward movement of the linkage lever 44 drives the inhalation piston rod 40 to move up. The upward movement of the inhalation piston rod 40 drives the inhalation piston 39 to move up. The upward movement of the inhalation piston 39 is drawn into the inhalation canister 38 through the one-way valve 36. At this time, the assist spring 41 extends. When exhalation ends and inhalation begins, the assist spring 41 contracts and pulls the inhalation piston 39 down. The downward movement of the inhalation piston 39 pushes the gas stored during exhalation through the inhalation assist one-way valve 37 into the inhalation assist transmission pipe 35. The gas is then transmitted to the dust filter inhalation valve 24 through the inhalation assist transmission pipe 35, thereby achieving the technical effect of inhalation assist and reducing the worker's inhalation resistance. The above is the specific working process of this invention. This step can be repeated for the next use.

[0025] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the foregoing and its equivalents.

[0027] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A multi-functional safety helmet, characterized in that: The device includes a cap shell (1), an inner shell (2), a cushioning reminder component (3), a tightening strap (4), and an assisted dustproof breathing device (5). The inner shell (2) is located inside the cap shell (1). The cushioning reminder component (3) is located on the cap shell (1) and the inner shell (2). The tightening strap (4) is located on the cushioning reminder component (3). The assisted dustproof breathing device (5) is located on the cap shell (1). The cushioning reminder component (3) includes a movable cushioning arc plate (6), a cushioning spring (7), a trigger post (8), and a triggering reminder component (9). The movable cushioning arc plate (6) is engaged and slidably located in the inner shell (2). The cushioning spring (7) is located on the upper surface of the movable cushioning arc plate (6). The trigger post (8) is located at the center of the upper surface of the movable cushioning arc plate (6).

2. The multifunctional safety helmet according to claim 1, characterized in that: The trigger reminder (9) includes a striking rod (10), a reset spring (11), a limiting ring plate (12), and a bell (13). The limiting ring plate (12) is located on the inner upper wall of the cap (1). The striking rod (10) is slidably located in the limiting ring plate (12). The striking rod (10) is provided with a limiting flange (14). The reset spring (11) is sleeved on the outside of the striking rod (10). The reset spring (11) is located between the limiting flange (14) and the limiting ring plate (12). The bell (13) is swaying on the inner upper wall of the cap (1).

3. A multifunctional safety helmet according to claim 2, characterized in that: The end of the striking rod (10) near the trigger post (8) is a beveled surface, the upper end of the trigger post (8) is a beveled surface, the beveled surface of the striking rod (10) matches the beveled surface of the trigger post (8), and the striking rod (10) is located above the trigger post (8).

4. A multifunctional safety helmet according to claim 3, characterized in that: The movable buffer arc plate (6) is provided with locking blocks (15) at both ends, and the inner shell (2) is provided with locking grooves (16) on two opposite inner sidewalls. The movable buffer arc plate (6) is engaged and slidably disposed in the locking grooves (16) by locking blocks (15).

5. A multifunctional safety helmet according to claim 4, characterized in that: The assisted dustproof breathing device (5) includes a dust mask (17), a protective cylinder (18), an exhalation component (19), and an inhalation assist component (20). The cap shell (1) has clamps (21) on both sides. The protective cylinder (18) is snapped and disassembled in the clamps (21). The exhalation component (19) is located in the protective cylinder (18). The inhalation assist component (20) is located in the protective cylinder (18). The dust mask (17) is connected to the exhalation component (19) and the inhalation assist component (20) respectively.

6. A multifunctional safety helmet according to claim 5, characterized in that: The dust mask (17) includes a mask body (22), an exhalation valve (23) and a dust-filtering inhalation valve (24). The exhalation valve (23) is located at the center of the outer side of the mask body (22). The dust-filtering inhalation valve (24) is symmetrically located on both sides of the mask body (22). The mask body (22) is provided with a wearing hole (25), and an elastic strap (26) is detachably installed in the wearing hole (25).

7. A multifunctional safety helmet according to claim 6, characterized in that: The exhalation assembly (19) includes an exhalation transmission tube (27), an exhalation inlet check valve (28), an exhalation outlet check valve (29), an exhalation canister (30), an exhalation piston (31), and an exhalation piston rod (32). The exhalation canister (30) is housed in a protective cylinder (18). The upper two side walls of the exhalation canister (30) are provided with an exhalation inlet (33) and an exhalation outlet (34). The exhalation inlet check valve (28) is located at the exhalation inlet (33). In the exhalation exhaust one-way valve (29), the exhalation outlet (34) is located in the exhalation outlet (34), the exhalation piston (31) is movably located in the exhalation canister (30), the exhalation piston rod (32) passes through the exhalation canister (30) and is connected to the exhalation piston (31), one end of the exhalation transmission tube (27) is connected to the exhalation inlet one-way valve (28), and the other end of the exhalation transmission tube (27) is connected to the exhalation valve (23); the exhalation assembly (19) is provided with two sets.

8. A multifunctional safety helmet according to claim 7, characterized in that: The suction assist assembly (20) includes a suction assist transmission pipe (35), a suction inlet check valve (36), a suction assist check valve (37), a suction canister (38), a suction piston (39), a suction piston rod (40), and an assist spring (41). The suction canister (38) is located in a protective cylinder (18). The lower end of the suction canister (38) has a suction inlet (42) and a suction assist inlet (43) on both sides. The suction inlet check valve (36) is located in the suction inlet (42), and the suction assist check valve (37) is located in the suction inlet (42). The suction assist port (43) is located in the suction assist port (43), the suction piston (39) is movably located in the suction tank (38), the suction piston rod (40) passes through the suction tank (38) and is connected to the suction piston (39), the assist spring (41) is located between the suction piston (39) and the bottom wall of the suction tank (38), one end of the suction assist transmission pipe (35) is connected to the suction assist one-way valve (37), and the other end of the suction assist transmission pipe (35) is connected to the dust filter suction valve (24); the suction assist assembly (20) is provided in two sets.

9. A multifunctional safety helmet according to claim 8, characterized in that: The protective cylinder (18) is provided with a rotatable linkage lever (44), and the bottom wall of the linkage lever (44) is provided with an embedded cavity (45). The upper ends of the exhalation piston rod (32) and the inhalation piston rod (40) are respectively provided with embedded balls (46), and the embedded balls (46) are embedded and slidably disposed in the embedded cavity (45).

10. A multifunctional safety helmet according to claim 9, characterized in that: The exhalation inlet one-way valve (28) includes a fixed shell (47), a sealing plate (48), a hollow limiting plate (49), a support plate (50), and a spring (51). The fixed shell (47) is located in the exhalation inlet (33), the hollow limiting plate (49) is located in the fixed shell (47), the support plate (50) is located in the fixed shell (47), the sealing plate (48) is movably located in the fixed shell (47), and the hollow limiting plate (49) limits the sealing plate (48). One end of the spring (51) is located on the support plate (50), and the other end of the spring (51) passes through the hollow limiting plate (49) and is connected to the sealing plate (48). The structure of the exhalation exhaust one-way valve (29) is the same as that of the exhalation inlet one-way valve (28), only the direction is reversed. The structure of the inhalation inlet one-way valve (36) is the same as that of the exhalation inlet one-way valve (28), and the structure of the inhalation assist one-way valve (37) is the same as that of the exhalation exhaust one-way valve (29).

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