Helmet disinfection cabinet and helmet size calculation method

Abstract

The invention discloses a helmet disinfection cabinet and a helmet size calculation method. The helmet disinfection cabinet comprises a cabinet body which is divided into an upper box body and a lower box body, a disinfection cavity is formed in the upper box body, and steam and hot air inlets are formed in the bottom of the upper box body; the steam generating device comprises a steam container and a heater, is connected with the steam inlet through a pipe fitting and is provided with an electric valve I; the hot air generating device is connected with the hot air inlet through a pipe and provided with a second electric valve. The perfume storage container is connected with the steam container through a pipe fitting and is provided with an electric valve III; the controller adjusts the steam pressure, the hot air temperature and the disinfection time according to the size and the type of the helmet, and the first electric valve and the second electric valve conduct mutual exclusion control. The device has the beneficial effects that steam disinfection, hot air drying and aromatherapy odor removal are integrated; the controller can individually adjust parameters according to the size and type of the helmet, so that the applicability of the disinfection cabinet is improved; and the risk of high-temperature gas leakage is avoided through mutual exclusion control of the electric valves. According to the helmet size calculation method, the helmet size is calculated through sensor modules such as an ultrasonic wave and light emission calculation device and an image sensor, and a basis is provided for disinfection parameter adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of helmet disinfection equipment, in particular to a helmet disinfection cabinet and a helmet size calculation method. Background Art

[0002] In modern society, helmets are essential safety equipment for riders and are widely used on motorcycles, electric bikes, and in various sports. However, due to their prolonged, close contact with the wearer's head, helmets are susceptible to contamination from sweat, dandruff, and various bacteria and microorganisms. These contaminants not only create unpleasant odors, severely impacting the wearing experience, but also pose a potential threat to the wearer's health.

[0003] Currently, there are relatively limited cleaning and disinfection methods for helmets on the market. Traditional manual wiping cleaning methods make it difficult to thoroughly disinfect every corner of the helmet and are inefficient. Some simple disinfection equipment can only achieve a single disinfection function and cannot meet the needs of comprehensive cleaning and care for helmets. For example, although common ultraviolet disinfection equipment can kill bacteria to a certain extent, it cannot effectively remove odors from helmets, and the disinfection effect on some microorganisms such as mold that grow in humid environments is poor. At the same time, existing disinfection equipment lacks an intelligent adjustment mechanism when dealing with helmets of different sizes and types, making it difficult to achieve accurate and efficient disinfection operations.

[0004] Given the above situation, the development of a helmet disinfection cabinet that integrates steam disinfection, hot air drying, and aromatherapy deodorization functions, and can be customized according to the different characteristics of helmets, has important practical significance and market demand. The helmet disinfection cabinet involved in this patent is designed to effectively solve these problems existing in the prior art. Summary of the Invention

[0005] In view of the deficiencies in the background technology, the present invention provides a helmet disinfection cabinet and a helmet size calculation method.

[0006] The technical solution adopted by the present invention is: a helmet disinfection cabinet, comprising: A cabinet body, the cabinet body comprising an upper box body and a lower box body, the upper box body being provided with a disinfection chamber, the bottom of the disinfection chamber being provided with a steam inlet and a hot air inlet; A steam generating device, the steam generating device is used for steam sterilization, the steam generating device comprises a steam container and a heater, the steam container is connected to the steam inlet via a pipe fitting 1, and the pipe fitting 1 is provided with an electric valve 1; A hot air generating device, the hot air generating device is used for hot air drying, the hot air generating device is connected to the hot air inlet through a second pipe fitting, and the second pipe fitting is provided with a second electric valve; a perfume storage container connected to the steam container via a third pipe fitting, wherein the third pipe fitting is provided with a third electric valve; a controller that adjusts steam pressure, hot air temperature, and disinfection time based on helmet size and helmet type; The electric valve 1 and the electric valve 2 are controlled mutually exclusively. The hot air valve is closed during steam sterilization, and the steam valve is closed during hot air drying.

[0007] The above technical solution achieves multifunctional integration, enabling one-stop steam disinfection, hot air drying, and aromatherapy, meeting comprehensive helmet cleaning and care needs. Intelligent control enhances targeted disinfection, adapting different parameters to different helmets, improving disinfection effectiveness and safety. Mutually exclusive valve control prevents simultaneous entry of steam and hot air, optimizing equipment operation and extending its service life.

[0008] Furthermore, the steam inlet and the hot air inlet are provided with a wind hood, the wind hood is evenly distributed with a plurality of air holes, and the wind hood is also provided with an ultraviolet disinfection lamp.

[0009] With the above technical solution, air hoods are installed at the steam and hot air inlets, with air holes evenly distributed on them to evenly disperse the steam and hot air, avoiding local overheating or overhumidification. The ultraviolet disinfection lamp further enhances the disinfection capacity, using the bactericidal properties of ultraviolet light to additionally disinfect items in the disinfection chamber.

[0010] Furthermore, a steam pressure relief port and a water supply port are provided on the steam container, an electric valve four is connected to the water supply port, and a gravity plug is provided in the steam pressure relief port. When the steam pressure in the steam container exceeds a threshold value, the steam pushes up the gravity plug to complete the pressure relief.

[0011] With the above technical solution, the steam pressure relief vent and water supply port on the steam container each have their own functions. The water supply port is connected to electric valve 2 to replenish the water required for steam generation. When the steam pressure exceeds a threshold, the gravity plug inside the steam pressure relief vent is lifted by the steam, discharging excess steam and relieving pressure, ensuring the safe operation of the steam container.

[0012] Furthermore, the steam container is also connected to a temperature sensor and a water level sensor, and data detected by the temperature sensor and the water level sensor are fed back to the controller.

[0013] With this technical solution, temperature and water level sensors are installed on the steam container to monitor the temperature and water level inside in real time, feeding this data back to the controller. Based on this data, the controller precisely regulates the steam generator's operating status.

[0014] Furthermore, the hot air generating device includes a fan and a heater.

[0015] After adopting the above technical solution, the hot air generating device consists of a fan and a heater. The fan provides wind power, blowing out the heat generated by the heater to form hot air, which is transported to the disinfection chamber through pipe 2 for drying the helmet.

[0016] Furthermore, the controller is preset with at least a correspondence between helmet types and disinfection procedures, including at least: Fire helmets: Steam sterilization temperature is 90-110℃, sterilization time is 5-10 minutes, and then hot air drying is carried out for 20-50 minutes; Children's helmets: Steam sterilization temperature is 60-70℃, sterilization time is 5-9 minutes, and then hot air drying is carried out for 20-40 minutes.

[0017] Using this technical solution, the controller pre-programs different helmet types and disinfection routines. Specific steam disinfection temperature ranges, disinfection times, and hot air drying times are set for firefighter helmets and children's helmets, respectively. When the controller recognizes the appropriate helmet type, it automatically invokes the corresponding program.

[0018] The present application also provides a method for calculating the size of a helmet, which is characterized by comprising: A sensor module, selected from at least one of the following: a. Ultrasonic calculation device, which includes an ultrasonic module, a trigger generator, a timer, and a distance calculation logic box. The ultrasonic calculation device calculates the distance to the helmet based on the time difference between the ultrasonic module's transmission and reception of ultrasonic waves. The calculation formula is distance = (round-trip time × speed of sound) / 2; b. A light emission calculation device, which includes a light emitting element module, an optical element module, an LED control unit, a MUX, and a timer. The device calculates the size of the helmet by the number of light path obstructions. The calculation formula is distance = (total number of light paths - number of light path obstructions) × unit spacing; c. Image sensor. The image sensor includes an image module, an image processor, and image correction and distance calculation logic modules. It analyzes the helmet outline using the image pixel histogram. The calculation formula is: distance = (number of base pixels - number of outline pixels) × unit pixel distance.

[0019] Using this technical solution, helmet dimensions are measured using various sensor modules. The ultrasonic calculation device uses the time difference between ultrasonic emission and reception to calculate the distance to the helmet using a formula. The optical emission calculation device uses the number of light path obstructions to calculate the helmet dimensions using a formula. The image sensor analyzes the pixels of the helmet's outline and uses a formula to determine the helmet dimensions, providing a basis for the controller to adjust disinfection parameters.

[0020] Furthermore, the image sensor performs contour analysis based on the lower edge of the helmet, and deducts pixel areas exceeding a threshold.

[0021] With this technical solution, the image sensor analyzes the helmet's contours, using the bottom edge as a reference and subtracting pixels that exceed a threshold. This eliminates external interference from the helmet, accurately identifying its true contour and thus precisely calculating its dimensions.

[0022] Furthermore, the temperature detection unit is used to detect the ambient temperature (T) for correcting the speed of sound (c=331.4+0.6Tm / s) to improve the ranging accuracy.

[0023] With this technical solution, the temperature detection unit measures the ambient temperature (T) and corrects the speed of sound according to the formula c = 331.4 + 0.6T m / s. In the ultrasonic calculation device, the speed of sound is used to calculate the distance to the helmet. This corrected speed of sound improves ranging accuracy.

[0024] The beneficial effects of the present invention are: 1. By integrating a steam generator, a hot air generator, and a perfume storage container, the helmet integrates steam disinfection, hot air drying, and aromatherapy deodorization functions. Steam disinfection utilizes the powerful bactericidal ability of high-temperature steam to penetrate deep into every tiny gap and corner of the helmet, effectively killing attached bacteria, viruses, mold, and other microorganisms. The hot air drying function dries the moisture inside the helmet after disinfection, preventing bacterial growth in a humid environment. It also greatly shortens the time interval between disinfection and reuse, improving ease of use. Furthermore, by distributing the fragrant ingredients in the perfume into the helmet, it effectively removes unpleasant odors caused by long-term use and residual odors from high-temperature steam, ensuring that the helmet always maintains a fresh and pleasant smell, significantly improving wearing comfort.

[0025] 2. The controller can adjust the steam pressure, hot air temperature, and disinfection time based on the size and type of helmet. This personalized adjustment ensures a safe and efficient disinfection process for helmets of different materials, structures, and sizes. For example, for children's helmets that are made of lightweight materials, designed for comfort and safety, and worn by children, the steam pressure and hot air temperature can be appropriately reduced to avoid damage to the helmet due to excessive pressure or temperature. After all, children's helmets differ from adult helmets in material strength and high-temperature resistance. At the same time, the appropriate disinfection time can be accurately set to ensure the disinfection effect and protect the healthy use environment for children. For motorcycle helmets made of thicker materials and with higher protection requirements, the steam pressure and hot air temperature can be increased accordingly, and the disinfection time can be extended to achieve deep disinfection. This intelligent adjustment greatly improves the applicability of the disinfection cabinet to various types of helmets and broadens the product's application range. Whether it is a motorcycle helmet for daily riding or a lightweight helmet designed for children, it can be appropriately and effectively disinfected in this disinfection cabinet.

[0026] 3. Through the mutual exclusive control of electric valve 1 and electric valve 2, the hot air inlet channel is closed during the steam sterilization stage, and the steam inlet channel is closed during the hot air drying stage, completely avoiding the risk of high-temperature gas leakage caused by the simultaneous opening of steam and hot air in traditional equipment.

[0027] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 for Figure 1 Enlarged schematic diagram of point A in the middle.

[0030] Figure 3 This is a schematic diagram of the interior after the lower box is hidden.

[0031] Figure 4 This is a schematic diagram of the interior after the lower and upper boxes are hidden.

[0032] Figure 5 Schematic diagram of the ultrasonic computing device.

[0033] Figure 6 This is the logical connection block diagram of the ultrasonic computing device.

[0034] Figure 7 Schematic diagram of the principle of light emission computing device.

[0035] Figure 8 This is a logical connection block diagram of the light emission computing device.

[0036] Figure 9 Schematic diagram of the image sensor principle.

[0037] Figure 10 This is the logical connection block diagram of the image sensor.

[0038] Figure 1-10 Middle: 1. Cabinet; 2. Upper box; 3. Lower box; 4. Disinfection chamber; 5. Steam inlet; 6. Hot air inlet; 7. Steam container; 9. Pipe fitting 1; 10. Electric valve 1; 11. Pipe fitting 2; 12. Electric valve 2; 13. Perfume storage container; 14. Pipe fitting 3; 15. Electric valve 3; 17. Air hood; 18. Air hole; 19. UV disinfection lamp; 20. Steam pressure relief port; 21. Water supply port; 22. Electric valve 4; 23. Temperature sensor; 24. Water level sensor; 25. Fan; 26. Heater. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative positional relationship and movement status of the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] The invention provides a helmet disinfection cabinet and a helmet size calculation method.

[0042] In this embodiment, referring to Figure 1-10 The helmet disinfection cabinet and the helmet size calculation method include: Cabinet 1, the cabinet 1 includes an upper box 2 and a lower box 3, a disinfection chamber 4 is provided in the upper box 2, and a steam inlet 5 and a hot air inlet 6 are provided at the bottom of the disinfection chamber 3; A steam generating device, which is used for steam sterilization and includes a steam container 7 and a heater. The steam container is connected to the steam inlet via a pipe 9, and an electric valve 10 is provided on the pipe. A hot air generating device, which is used for hot air drying and is connected to the hot air inlet via a second pipe 11, and a second electric valve 12 is provided on the second pipe 11; A perfume storage container 13, which is connected to the steam container via a pipe 3 14, on which a motorized valve 3 15 is provided; a controller that adjusts steam pressure, hot air temperature, and disinfection time based on helmet size and helmet type; The electric valve 1 and the electric valve 2 are controlled mutually exclusively. The hot air valve is closed during steam sterilization, and the steam valve is closed during hot air drying.

[0043] In the above technical solution, the cabinet is divided into an upper box and a lower box. The disinfection chamber of the upper box is used to prevent the helmets to be disinfected, and the lower box accommodates the steam generating device, the hot air generating device and the perfume storage container.

[0044] The steam generator performs high-temperature disinfection based on the helmet type and size. The steam container holds a certain amount of water and is equipped with a heater (not shown in the figure, such as a heating rod) to heat the water. When powered on, the heater heats the water in the container to a boiling state, generating high-temperature steam. The steam container is connected to the steam inlet at the bottom of the disinfection chamber via pipe 1.

[0045] Among them, the hot air generating device is controlled to turn on by the controller during the hot air drying stage, allowing hot air to enter the disinfection chamber to dry the disinfected helmet.

[0046] The controller can be a CPU, with an operation panel installed on the disinfection cabinet housing. The operation panel is connected to the CPU via a data transmission interface (such as a USB interface). The CPU pre-stores optimal disinfection parameters for different helmet types, including steam pressure, hot air temperature, and disinfection time adjustment and control.

[0047] In addition, based on the CPU, a user operation panel can be integrated on the cabinet. The panel is integrated with a touch screen, NFC identification module and disinfection program selection button. The display screen displays parameters such as temperature, water level, disinfection pressure and remaining disinfection time in real time.

[0048] Specifically, a wind cover 17 is provided on the steam inlet and the hot air inlet. A plurality of wind holes 18 are evenly distributed on the wind cover 17. An ultraviolet disinfection lamp 19 is also provided on the wind cover.

[0049] In this embodiment, the air vent design ensures even distribution of steam and hot air within the disinfection chamber, improving disinfection and drying uniformity and reducing blind spots. The UV disinfection lamp, as a supplementary disinfection method, enhances the disinfection effect, kills a wider range of microorganisms, and improves the hygienic standards of helmet disinfection.

[0050] Specifically, a steam pressure relief port 20 and a water supply port 21 are provided on the steam container. An electric valve 22 is connected to the water supply port 21. A gravity plug is provided in the steam pressure relief port. When the steam pressure in the steam container exceeds the threshold, the steam pushes up the gravity plug to complete the pressure relief.

[0051] In this embodiment, the gravity plug prevents the steam container from being over-pressurized, ensuring safe and stable operation of the equipment. The automatic pressure relief function reduces manual intervention, reduces operational risks, and improves the reliability and safety of the equipment.

[0052] Specifically, the steam container is further connected to a temperature sensor 23 and a water level sensor 24, and the data detected by the temperature sensor and the water level sensor are fed back to the controller.

[0053] In this embodiment, a temperature sensor and a water level sensor are installed on the steam container to monitor the temperature and water level inside the steam container in real time and feed the data back to the controller. The controller uses this data to precisely control the operating status of the steam generating device.

[0054] Specifically, the hot air generating device includes a fan 25 and a heater 26 .

[0055] In this embodiment, the fan and the heater work together to flexibly adjust the hot air temperature and air volume according to the controller instructions, thereby improving the drying efficiency and effect.

[0056] Specifically, the controller at least presets a correspondence between helmet types and disinfection procedures, including at least: Fire helmets: Steam sterilization temperature is 90-110℃, sterilization time is 5-10 minutes, and then hot air drying is carried out for 20-50 minutes; Children's helmets: Steam sterilization temperature is 60-70℃, sterilization time is 5-9 minutes, and then hot air drying is carried out for 20-40 minutes.

[0057] In this embodiment, the controller can preset disinfection modes for different helmet types, enabling highly intelligent and personalized disinfection. Adaptable disinfection solutions are provided based on the material, structure, and usage scenario of each helmet. For example, firefighter helmets are made of thick materials and are used in complex environments, so high-temperature, long-term disinfection ensures a deep clean. Children's helmets are made of thin materials and are sensitive to wearers, so low-temperature, short-term disinfection ensures safety, meeting diverse needs and improving product applicability.

[0058] The present application also provides a method for calculating the size of a helmet, which is characterized by comprising: A sensor module, selected from at least one of the following: a. Ultrasonic calculation device, which includes an ultrasonic module, a trigger generator, a timer, and a distance calculation logic box. The ultrasonic calculation device calculates the distance to the helmet based on the time difference between the ultrasonic module's transmission and reception of ultrasonic waves. The calculation formula is distance = (round-trip time × speed of sound) / 2; b. Light emitting computing device, the light emitting computing device includes a light emitting element module, an optical element module, The LED control unit, MUX and timer calculate the size of the helmet by the number of light path obstructions. The calculation formula is distance = (total number of light paths - number of light path obstructions) × unit spacing; c. Image sensor. The image sensor includes an image module, an image processor, and image correction and distance calculation logic modules. It analyzes the helmet outline using the image pixel histogram. The calculation formula is: distance = (number of base pixels - number of outline pixels) × unit pixel distance.

[0059] Among them, ultrasonic computing devices such as Figure X As shown in the figure, the ultrasonic module includes a transmitter and a receiver. The transmitter is used to transmit ultrasonic signals; the receiver is used to receive reflected ultrasonic waves and feed them back to a timer.

[0060] Trigger generator is used to trigger the pulse signal of the ultrasonic transmitter and control the timing of ultrasonic emission.

[0061] The timer is used to measure the round trip time (t) from ultrasonic emission to reception and input the time data into the controller (CPU).

[0062] The distance calculation logic box calculates the target distance according to the formula: distance = (round-trip time × speed of sound) / 2, and inputs the result into the controller (CPU).

[0063] The specific principle of the ultrasonic computing device is as follows Figure 6 and 7 As shown, ultrasound is sent to an object and reflected back. The round-trip time is measured to calculate the distance, and the size of the helmet is calculated based on this distance. Distance = (round-trip time x speed of sound) / 2 Among them, the light emission computing device is as follows Figure 7 and 8 As shown, it includes a light-emitting element module, an optical element module, an LED control unit, a MUX and a timer.

[0064] A light-emitting element module is used to emit light signals of a specific wavelength (such as infrared light or visible light) to detect targets or trigger external devices.

[0065] The optical component module is used to receive reflected or transmitted light signals and convert the light intensity into electrical signals for output.

[0066] The LED control unit is used to control the switch, brightness and frequency of the light-emitting element to ensure stable emission of the light signal.

[0067] The MUX is used to switch multiple optical signal input channels and select the data of a specific optical component module to be transmitted to the subsequent processing unit.

[0068] The light emission calculation device works as follows: a light-emitting element mounted on the upper or lower side emits a straight line of light, which is received by a light-receiving element on the other side, which is matched 1:1. The position where the light enters the light-receiving element is calculated as "on." Distance is calculated based on the distance to the point where the light cannot reach due to objects such as helmets obstructing the straightness of the light. This distance is then used to calculate the size of the helmet. Distance = (Total number of light paths - Number of light paths blocked) × Unit Pitch.

[0069] The image sensor is Figure 9 and 10As shown, it includes an image module, an image processor, an image correction and a distance calculation logic module.

[0070] The image module is deployed on the upper part of the disinfection cabinet to capture images of the helmet; Image processors and image correction are used to pre-process the original image (such as denoising, format conversion, edge enhancement) and perform image distortion correction and grayscale calibration.

[0071] Distance calculation logic module, used for tool formula calculation: distance = (number of base pixels - number of contour pixels) × unit pixel distance.

[0072] The image sensor works as follows: Using an image sensor mounted on the top or side, the image is captured, depending on whether a helmet is present or not. The entire underside of the helmet shell is set to a certain pixel size (e.g., 800 x 800 pixels). This is saved as a default value, and the pixel values ​​of the image when a helmet is present are processed using a histogram. Pixels exceeding the threshold are calculated as the helmet's edge value. Subtracting the number of pixels exceeding the edge value from the total length and width pixel values ​​yields the helmet's size as the remaining length and width pixel values.

[0073] The calculation formula is: distance = (number of reference pixels - number of contour pixels) × unit pixel distance.

[0074] Specifically, the image sensor performs contour analysis based on the lower edge of the helmet and deducts pixel areas exceeding a threshold.

[0075] In this embodiment, when analyzing the helmet's outline, the image sensor uses the bottom edge of the helmet as a reference and deducts pixels that exceed a threshold. This eliminates interference from the helmet's external environment, accurately identifies the helmet's true outline, and thus precisely calculates the helmet's size.

[0076] like Figure 9 As shown, the number of pixels in an image is determined by the number of horizontal pixels x the number of vertical pixels. Typically, image sensors are constructed using horizontal or vertical pixel units. For example, if the image has 800 horizontal pixels and 800 vertical pixels, the total horizontal length is determined as 800 horizontal pixels x the distance between pixels. Considering the actual area of ​​a helmet sterilizer (800mm x 800mm), the x-axis distance of each pixel is 1mm. If the measured horizontal distance is calculated as 150 pixels, the horizontal dimension of the helmet is 150mm.

[0077] Specifically, the temperature detection unit is used to detect the ambient temperature (T) to correct the speed of sound (c=331.4+0.6Tm / s) and improve the ranging accuracy.

[0078] In this embodiment, the effect of ambient temperature on the speed of sound is taken into account, effectively improving the accuracy of the ultrasonic distance measurement device when measuring helmet distance. Ambient temperature changes can cause the speed of sound to change. This correction ensures accurate measurement of helmet dimensions in various environments, improving the adaptability and accuracy of the entire measurement system and ensuring precise adjustment of disinfection parameters.

[0079] Technical personnel should note: Although the present invention has been described according to the above specific implementation methods, the concept of the present invention is not limited to this invention. Any modification using the concept of the present invention will be included in the scope of protection of this patent right.

Claims

1. A helmet disinfection cabinet, characterized in that include: A cabinet body, the cabinet body comprising an upper box body and a lower box body, the upper box body being provided with a disinfection chamber, the bottom of the disinfection chamber being provided with a steam inlet and a hot air inlet; A steam generating device, the steam generating device is used for steam sterilization, the steam generating device comprises a steam container and a heater, the steam container is connected to the steam inlet via a pipe fitting 1, and the pipe fitting 1 is provided with an electric valve 1; A hot air generating device, the hot air generating device is used for hot air drying, the hot air generating device is connected to the hot air inlet through a second pipe fitting, and the second pipe fitting is provided with a second electric valve; a perfume storage container connected to the steam container via a third pipe fitting, wherein the third pipe fitting is provided with a third electric valve; a controller that adjusts steam pressure, hot air temperature, and disinfection time based on helmet size and helmet type; The electric valve 1 and the electric valve 2 are controlled mutually exclusively. The hot air valve is closed during steam sterilization, and the steam valve is closed during hot air drying.

2. The helmet disinfection cabinet according to claim 1, characterized in that: The steam inlet and the hot air inlet are provided with wind covers, the wind covers are evenly distributed with a plurality of wind holes, and the wind covers are also provided with ultraviolet disinfection lamps.

3. The helmet disinfection cabinet according to claim 1, characterized in that: A steam pressure relief port and a water supply port are provided on the steam container. An electric valve four is connected to the water supply port. A gravity plug is provided in the steam pressure relief port. When the steam pressure in the steam container exceeds a threshold, the steam lifts the gravity plug to complete the pressure relief.

4. The helmet disinfection cabinet according to claim 1 or 3, characterized in that: The steam container is also connected to a temperature sensor and a water level sensor, and data detected by the temperature sensor and the water level sensor are fed back to the controller.

5. The helmet disinfection cabinet according to claim 4, characterized in that: The hot air generating device comprises a fan and a heater.

6. The helmet disinfection cabinet according to claim 2, characterized in that: The controller is preset with at least a correspondence between helmet types and disinfection procedures, including at least: Fire helmets: Steam sterilization temperature is 90-110℃, sterilization time is 5-10 minutes, and then hot air drying is carried out for 20-50 minutes; Children's helmets: Steam sterilization temperature is 60-70℃, sterilization time is 5-9 minutes, and then hot air drying is carried out for 20-40 minutes.

7. A method for calculating the size of a helmet, characterized by: include: A sensor module, selected from at least one of the following: a. Ultrasonic computing device, the ultrasonic computing device includes an ultrasonic module, a Trigger transmitter, The timer and distance calculation logic box calculates the distance to the helmet based on the time difference between the ultrasonic module's transmission and reception of ultrasonic waves. The calculation formula is distance = (round-trip time × speed of sound) / 2. b. Light emitting computing device, the light emitting computing device includes a light emitting element module, an optical element module, The LED control unit, MUX and timer calculate the size of the helmet by the number of light path obstructions. The calculation formula is distance = (total number of light paths - number of light path obstructions) × unit spacing; c. Image sensor. The image sensor includes an image module, an image processor, and image correction and distance calculation logic modules. It analyzes the helmet outline using the image pixel histogram. The calculation formula is: distance = (number of base pixels - number of outline pixels) × unit pixel distance.

8. The method for calculating helmet size according to claim 7, characterized in that: The image sensor's profile analysis is based on the lower edge of the helmet, and pixel areas exceeding a threshold are deducted.

9. The method for calculating helmet size according to claim 7, characterized in that: The temperature detection unit is used to detect the ambient temperature (T) and to correct the speed of sound (c=331.4+0.6Tm / s) to improve the distance measurement accuracy.

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