Safety helmet

Abstract

The invention provides a safety helmet which comprises a shell, a first protective cover, a second protective cover and a buffer assembly, the first protective cover and the second protective cover are sequentially arranged on the inner side of the shell, the first protective cover is semicircular, the second protective cover comprises a center plate, a fixing ring and a plurality of connecting plates, the center plate is arranged in the center of the first protective cover, and the fixing ring is arranged in the center of the second protective cover. The multiple connecting plates are evenly arranged around the center plate, the two ends of each connecting plate are connected with the center plate and the fixing ring respectively, the buffering assembly comprises a damper and multiple elastic pieces, the two ends of the damper are correspondingly connected with the first protective cover and the center plate, the elastic pieces and the connecting plates are arranged in a one-to-one correspondence mode, and the two ends of each elastic piece are correspondingly connected with the first protective cover and the connecting plates. According to the safety helmet disclosed by the invention, the safety protection capability of the helmet is improved, and more comfortable and reliable wearing experience is provided for a user.

Description

Technical Field

[0001] The invention relates to the technical field of safety equipment, and in particular to a safety helmet. Background Art

[0002] In high-risk working environments such as construction and industrial production, safety helmets are important protective equipment to protect the user's head from impact injuries. However, in related technologies, the buffer layer inside the safety helmet is usually made of foam material, which has a limited energy absorption effect. Especially when facing high-intensity or complex impacts, it is difficult to effectively remove the external impact force, resulting in users still facing high safety risks during the operation process. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] Safety helmets are usually composed of an outer shell and an internal buffer layer, where the outer shell is used to resist external impact and prevent sharp objects from penetrating, while the buffer layer reduces direct damage to the head by absorbing and dispersing impact energy. However, in the related art, the buffer layer inside the safety helmet is mostly made of foam material. Although this type of material has certain energy absorption characteristics, its energy absorption effect is limited, especially when facing high-intensity or complex impacts, it is difficult to effectively remove external impact forces.

[0005] Specifically, the energy absorption capacity of foam materials is limited by their density and structural characteristics. When subjected to high-speed or high-energy impact, the material is prone to plastic deformation or rupture, resulting in a significant decrease in energy absorption efficiency. In addition, the energy absorption process of foam materials is usually irreversible. Once impacted, its protective performance will be greatly reduced, and it will not be able to provide continuous and effective protection for subsequent impacts.

[0006] To this end, an embodiment of the present invention provides a safety helmet, which not only improves the safety protection capability of the helmet, but also provides a more comfortable and reliable wearing experience for the user.

[0007] The safety helmet provided by the embodiment of the present invention includes an outer shell, a first shield, a second shield and a buffer assembly, wherein the first shield and the second shield are sequentially arranged on the inner side of the outer shell, the first shield is arranged in a semicircular shape, the second shield includes a center plate, a fixing ring and a plurality of connecting plates, the center plate is arranged at the center position of the first shield, a plurality of connecting plates are evenly arranged around the center plate, the two ends of the connecting plate are respectively connected to the center plate and the fixing ring, the buffer assembly includes a damper and a plurality of elastic members, the two ends of the damper are correspondingly connected to the first shield and the center plate, the elastic members are arranged one-to-one with the connecting plates, and the two ends of the elastic members are correspondingly connected to the first shield and the connecting plates.

[0008] In summary, the safety helmet provided by the present invention forms multi-layer protection through the outer shell, the first shield and the second shield, and forms a buffer system using dampers and elastic parts, which not only significantly improves the safety protection capability of the helmet, but also provides the user with a more comfortable and reliable wearing experience.

[0009] In some embodiments, the first shield includes a shield body and a plurality of connection bands, wherein the connection bands are connected between the shield body and the outer shell, and the plurality of connection bands are arranged at equal intervals along an edge of the shield body.

[0010] In some embodiments, the second shield further comprises a reinforcement ring, the reinforcement ring is arranged on the outer edge of the center plate, the connection plate has a connection end connected to the center plate, and the connection end is located at the connection between the reinforcement ring and the center plate;

[0011] And / or, the connecting plate is made of soft material.

[0012] In some embodiments, the safety helmet further comprises a back neck guard, which is configured in an arc shape and is disposed on the fixing ring.

[0013] In some embodiments, the safety helmet also includes an eye protection assembly, which includes a frame, a lens and a cleaning mechanism. The frame is arranged on the outer shell, and a mounting groove is provided on the frame. The lens is detachably arranged in the mounting groove. The cleaning mechanism includes a scraper and a driver. The scraper is fitted on the lens, the scraper is transmission-connected to the driver, and the scraper can slide along the frame relative to the lens.

[0014] In some embodiments, the cleaning mechanism also includes a transmission screw and a moving block, the transmission screw is connected to the output end of the driver, the moving block is connected to the transmission screw by a thread, a slide groove is provided on the mirror frame, the moving block is slidably arranged in the slide groove, and the scraper is connected to the moving block.

[0015] In some embodiments, there are two scrapers, and the two scrapers are respectively arranged on both sides of the lens;

[0016] And / or, the cleaning mechanism further comprises a cleaning cloth, and the cleaning cloth is detachably arranged on the scraper.

[0017] In some embodiments, a slot is provided on the housing, and a plug-in board is provided on the mirror frame, and the plug-in board can be detachably inserted into the slot.

[0018] In some embodiments, the safety helmet further comprises a photovoltaic panel, a positioning groove is provided on the outer shell, the photovoltaic panel is inserted into the positioning groove, and the photovoltaic panel is electrically connected to the driver.

[0019] In some embodiments, the safety helmet also includes a limiting strap, a slot is provided on the outer shell, two ends of the limiting strap are correspondingly connected to the slot, and a plurality of ventilation holes are provided on the limiting strap, and the plurality of ventilation holes are arranged at equal intervals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a safety helmet provided by an embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of a safety helmet provided by an embodiment of the present invention at another angle.

[0022] Figure 3 It is a schematic diagram of the combination of a first protective shield and a second protective shield in a safety helmet provided by an embodiment of the present invention.

[0023] Figure 4 It is a schematic structural diagram of a second shield in a safety helmet provided by an embodiment of the present invention.

[0024] Figure 5 The figure is a schematic diagram of the structure of an eye protection component in a safety helmet provided by one embodiment of the present invention.

[0025] Figure 6 yes Figure 5 A partial enlarged view of the eye protection component at point A is shown.

[0026] Figure 7 It is a schematic diagram of the combination of an eye protection component and an inner shell component in a safety helmet provided by another embodiment of the present invention.

[0027] Reference numerals:

[0028] 10. housing; 11. slot; 12. positioning slot; 13. card slot;

[0029] 20. first protective cover; 21. cover body; 22. connecting belt;

[0030] 30. Second shield; 31. Center plate; 32. Fixing ring; 33. Connecting plate; 331. Connecting end; 34. Reinforcement ring;

[0031] 40. Buffer assembly; 41. Damper; 42. Elastic member; 43. Cushion block;

[0032] 50. Neck guard;

[0033] 60, eye protection assembly; 61, frame; 611, mounting slot; 612, slide slot; 613, plug-in board; 62, lens; 63, cleaning mechanism; 631, scraper; 632, driver; 633, transmission screw; 634, moving block; 635, cleaning cloth;

[0034] 70. Photovoltaic panels;

[0035] 80. Limiting strap; 81. Ventilation hole. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] like Figures 1 to 6 As shown, an embodiment of the present invention provides a safety helmet, which includes an outer shell 10, a first shield 20, a second shield 30 and a buffer assembly 40. The first shield 20 and the second shield 30 are arranged on the inner side of the outer shell 10 in sequence. The first shield 20 is set in a semicircular shape. The second shield 30 includes a center plate 31, a fixing ring 32 and a plurality of connecting plates 33. The center plate 31 is arranged at the center position of the first shield 20. The plurality of connecting plates 33 are evenly arranged around the center plate 31. The two ends of the connecting plates 33 are respectively connected to the center plate 31 and the fixing ring 32. The buffer assembly 40 includes a damper 41 and a plurality of elastic members 42. The elastic members 42 are arranged one by one with the connecting plates 33. The two ends of the damper 41 are correspondingly connected to the first shield 20 and the center plate 31.

[0038] Specifically, the outer shell 10 is located at the outermost layer of the safety helmet, the first shield 20 is located inside the outer shell 10, and the first shield 20 is set to be semicircular, so as to effectively disperse the external impact force and enhance the protective effect. When the helmet is impacted, the semicircular first shield 20 can evenly transfer the impact force to a wider area, thereby avoiding damage caused by excessive force on a single point, and significantly enhancing the protective effect of the helmet.

[0039] The second shield 30 is constructed with a mesh frame through a central plate 31, a fixing ring 32 and a plurality of connecting plates 33. The second shield 30 can closely fit the contour of the user's head through the mesh frame, is more ergonomic, and improves wearing comfort. More importantly, when impacted, the connecting plate 33 can disperse the impact force to the entire second shield 30 like a bridge, effectively absorbing and dispersing energy, and further reducing the risk of injury to the user's head.

[0040] In addition, the elastic member 42 and the damper 41 in the buffer assembly 40 form a complete shock absorption system, wherein the elastic member 42 is arranged in a one-to-one correspondence with the connecting plate 33, ensuring that each connecting plate 33 can obtain sufficient elastic support, thereby forming a dense and effective buffer network. When the helmet is impacted, the elastic member 42 can quickly deform and absorb part of the impact force. The damper 41 is connected to the first shield 20 and the center plate 31 at its two ends, so that the damper 41 can first withstand the impact force from the outside, greatly reducing the impact of the impact force on the user's head, thereby providing more comprehensive protection for the user.

[0041] In summary, the safety helmet provided by the present invention forms multi-layer protection through the shell 10, the first shield 20 and the second shield 30, and forms a buffer system using the damper 41 and the elastic member 42, which not only significantly improves the safety protection capability of the helmet, but also provides the user with a more comfortable and reliable wearing experience.

[0042] In this embodiment, the connecting plate 33 is made of soft material, so that the connecting plate 33 has a certain deformation ability and restoring force. On the one hand, the connecting plate 33 can better adapt to and fit parts of different shapes, making the structure of the entire helmet more compact and stable. On the other hand, when the helmet is impacted by external force, the soft connecting plate 33 can effectively absorb and disperse the impact force, reducing direct damage to the head. At the same time, due to its good elasticity, the connecting plate 33 can quickly return to its original shape after being impacted, thereby ensuring the continuous use effect of the helmet.

[0043] Furthermore, the buffer assembly 40 also includes a pad 43, which is arranged on the connecting plate 33, and one end of the elastic member 42 abuts against the pad 43. When the helmet is subjected to external impact force, the elastic member 42 will deform rapidly to absorb and disperse the impact force, and the pad 43 plays a key supporting and buffering role in this process. The pad 43 can not only effectively prevent the elastic member 42 from directly colliding with the connecting plate 33, causing damage or deformation, but also can further absorb the impact force through its own deformation, thereby improving the buffering effect.

[0044] Furthermore, the elastic member 42 can be configured as a spring or other elastic components.

[0045] In some embodiments, the first shield 20 includes a shield body 21 and a plurality of connecting belts 22, the connecting belts 22 are connected between the shield body 21 and the housing 10, and the plurality of connecting belts 22 are arranged at equal intervals along the edge of the shield body 21. Specifically, the shield body 21 is set in a semicircular shape, one end of the connecting belt 22 is connected to the edge of the shield body 21, and the other end of the connecting belt 22 is connected to the housing 10, and the connecting belts 22 are arranged at equal intervals along the edge of the shield body 21, so that a soft connection can be formed between the shield body 21 and the housing 10, which can effectively disperse and withstand the impact force from the outside.

[0046] Furthermore, the cover body 21 is provided with a plurality of positioning holes, the outer shell 10 is provided with binding blocks corresponding to the positioning holes, one end of the connecting belt 22 is passed through the positioning hole, and the other end of the connecting belt 22 can be bound to the binding block.

[0047] In some embodiments, the second shield 30 further includes a reinforcement ring 34, which is disposed on the outer edge of the center plate 31, and the connecting plate 33 has a connecting end 331 connected to the center plate 31, and the connecting end 331 is located at the connection between the reinforcement ring 34 and the center plate 31. The reinforcement ring 34 is disposed on the outer edge of the center plate 31, which can improve the structural strength of the center plate 31, and when the damper 41 reaches the maximum load, the edge of the reinforcement ring 34 can abut against the inner surface of the first shield 20, bear and disperse the external impact force, and help improve the overall protection capability.

[0048] That is to say, when the damper 41 can no longer bear more impact force, the reinforcement ring 34 can serve as a second line of defense to bear and disperse the external impact force, thereby improving the overall protection capability and providing more comprehensive and reliable protection for the components that need protection. Of course, in some embodiments, the reinforcement ring 34 and the center plate 31 can also be integrated.

[0049] In some embodiments, the safety helmet further comprises a back neck guard plate 50, which is configured in an arc shape and is disposed on the fixing ring 32. The back neck guard plate 50 in an arc shape can not only fit the neck curve of the user, but also can better disperse the impact force when impacted by external force, thereby reducing potential damage to the head, thereby providing all-round protection for the user.

[0050] like Figure 1 , Figure 5 and Figure 6As shown, in some embodiments, the safety helmet also includes an eye protection component 60, the eye protection component 60 includes a frame 61, a lens 62 and a cleaning mechanism 63, the frame 61 is arranged on the outer shell 10, the frame 61 is provided with a mounting groove 611, the lens 62 is detachably arranged in the mounting groove 611, the cleaning mechanism 63 includes a scraper 631 and a driver 632, the scraper 631 is fitted on the lens 62, the scraper 631 is transmission-connected to the driver 632, and the scraper 631 can slide along the frame 61 relative to the lens 62.

[0051] Specifically, the frame 61 is fixed to the housing 10, and a mounting groove 611 is provided on the frame 61. The lens 62 is detachably mounted in the mounting groove 611, which not only facilitates the replacement and cleaning of the user, but also enables the eye protection assembly 60 to adapt to the needs and scenarios of different users. The driver 632 serves as the power source of the scraper 631. The driver 632 can drive the scraper 631 to slide along the frame 61 relative to the lens 62 to achieve automatic cleaning of the lens 62, solving the problem that the lens 62 is easy to get dirty and difficult to clean in an outdoor environment, which not only greatly improves the user's experience, but also effectively protects the user's eyes from external pollutants.

[0052] Furthermore, the cleaning mechanism 63 further includes a transmission screw 633 and a moving block 634, wherein the transmission screw 633 is connected to the output end of the driver 632, the moving block 634 is connected to the transmission screw 633 by a thread, a slide groove 612 is provided on the mirror frame 61, the moving block 634 is slidably arranged in the slide groove 612, and the scraper 631 is connected to the moving block 634. The driver 632 drives the scraper 631 to move through the transmission screw 633 and the moving block 634, so that the scraper 631 can move smoothly and stably along the axial direction of the transmission screw 633, and can also ensure the accuracy and stability of the scraper 631 during the movement.

[0053] Furthermore, the slide groove 612 is extended along the left-right direction of the lens frame 61, and the moving block 634 can drive the scraper 631 to slide in the left-right direction of the lens frame 61 along the slide groove 612, so that the scraper 631 can fully cover and accurately clean the surface of the lens 62. At the same time, the scraper 631 slides in the left-right direction of the lens frame 61, which can also reduce the impact of the scraper 631 on the user during the cleaning process, so as to ensure that the user's vision will not be blocked or blurred during the cleaning process.

[0054] In this embodiment, the driver 632 can be set as a motor. Optionally, the driver 632 can include two motors, and the two motors clean the lens 62 respectively through the transmission screw 633, the moving block 634 and the scraper 631. Of course, in some embodiments, the driver 632 can also include a motor, which can be set as a dual-axis motor to achieve synchronous cleaning of the two lenses 62.

[0055] like Figure 6 As shown, in some embodiments, the cleaning mechanism 63 further includes a cleaning cloth 635, which is detachably disposed on the scraper 631, and can effectively remove dirt, dust, grease and other impurities on the lens 62, and restore the clarity and transparency of the lens 62. Optionally, the cleaning cloth 635 can be made of flannel to improve the cleaning quality and reduce the wear on the lens 62.

[0056] like Figure 6 As shown, in some embodiments, two scrapers 631 are provided, and the two scrapers 631 are respectively provided on both sides of the lens 62. During the cleaning process, the two scrapers 631 can move synchronously with the moving block 634 to clean both sides of the lens 62, thereby covering the entire lens 62 and ensuring cleaning efficiency.

[0057] like Figure 1 As shown, in some embodiments, the housing 10 is provided with a slot 11, and the frame 61 is provided with a plug-in board 613, which is detachably plugged into the slot 11. When the lens 62 needs to be cleaned or replaced, the user can easily pull out the plug-in board 613 from the slot 11, thereby separating the frame 61 from the housing 10, which not only simplifies the disassembly process, but also avoids the problems of loose or damaged screws that may exist in the traditional fixing method. At the same time, the close fit between the plug-in board 613 and the slot 11 also ensures the stability of the frame 61 during use, avoiding safety hazards caused by looseness or shaking.

[0058] In addition, if Figure 7 As shown, in some embodiments, the frame 61 can also be connected to the fixing ring 32 to improve the structural strength of the eye protection assembly 60. Even when subjected to strong impact or vibration, the lens 62 can remain in place and will not fall off or break due to looseness, thereby ensuring the safety of the user's eyes.

[0059] like Figure 1 As shown, in some embodiments, the safety helmet also includes a photovoltaic panel 70, a positioning groove 12 is provided on the outer shell 10, the photovoltaic panel 70 is inserted into the positioning groove 12, and the photovoltaic panel 70 is electrically connected to the driver 632, so as to provide power for the cleaning mechanism 63 and reduce dependence on batteries and power supply.

[0060] like Figure 1 As shown, in some embodiments, the safety helmet further includes a limiting strap 80, and a slot 13 is provided on the shell 10. The two ends of the limiting strap 80 are correspondingly connected to the slot 13 to prevent loosening or displacement during wearing. At the same time, the design of the slot 13 also facilitates the user to install and remove the limiting strap 80 to meet different wearing requirements or perform cleaning and maintenance.

[0061] Furthermore, the limiting strap 80 is provided with a plurality of ventilation holes 81, which are arranged at equal intervals, and can effectively alleviate the problem of stuffiness in the head and reduce the accumulation of sweat, so that the wearer can keep the head dry and comfortable even when wearing it for a long time.

[0062] Furthermore, the card slot 13 can be arranged corresponding to the positioning slot 12, that is, the positioning slot 12 is arranged on the outside of the shell 10, and the card slot 13 can be arranged on the inside of the shell 10, which not only enhances the practicality and convenience of the helmet, but also improves its overall aesthetics and structural strength.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A safety helmet, characterized in that: It includes an outer shell, a first shield, a second shield and a buffer assembly, wherein the first shield and the second shield are sequentially arranged on the inner side of the outer shell, the first shield is arranged in a semicircular shape, the second shield includes a center plate, a fixing ring and a plurality of connecting plates, the center plate is arranged at the center position of the first shield, a plurality of connecting plates are evenly arranged around the center plate, the two ends of the connecting plate are respectively connected to the center plate and the fixing ring, the buffer assembly includes a damper and a plurality of elastic members, the two ends of the damper are correspondingly connected to the first shield and the center plate, the elastic members are arranged one-to-one with the connecting plates, and the two ends of the elastic members are correspondingly connected to the first shield and the connecting plates.

2. The safety helmet according to claim 1, characterized in that: The first shield includes a shield body and a plurality of connection belts, wherein the connection belts are connected between the shield body and the outer shell, and the plurality of connection belts are arranged at equal intervals along the edge of the shield body.

3. The safety helmet according to claim 1, characterized in that: The second shield further comprises a reinforcement ring, the reinforcement ring is arranged on the outer edge of the center plate, the connection plate has a connection end connected to the center plate, and the connection end is located at the connection between the reinforcement ring and the center plate; And / or, the connecting plate is made of soft material.

4. The safety helmet according to claim 1, characterized in that: The safety helmet also includes a rear neck guard plate, which is configured in an arc shape and is arranged on the fixing ring.

5. The safety helmet according to claim 1, characterized in that: The safety helmet also includes an eye protection component, which includes a frame, a lens and a cleaning mechanism. The frame is arranged on the outer shell, and a mounting groove is provided on the frame. The lens is detachably arranged in the mounting groove. The cleaning mechanism includes a scraper and a driver. The scraper is fitted on the lens, and the scraper is transmission-connected to the driver. The scraper can slide along the frame relative to the lens.

6. The safety helmet according to claim 5, characterized in that: The cleaning mechanism also includes a transmission screw and a moving block, the transmission screw is connected to the output end of the driver, the moving block is connected to the transmission screw through a thread, a slide groove is provided on the mirror frame, the moving block is slidably arranged in the slide groove, and the scraper is connected to the moving block.

7. The safety helmet according to claim 5, characterized in that: There are two scrapers, which are respectively arranged on two sides of the lens; And / or, the cleaning mechanism further comprises a cleaning cloth, and the cleaning cloth is detachably arranged on the scraper.

8. The safety helmet according to claim 5, characterized in that: The shell is provided with a slot, the mirror frame is provided with a plug-in board, and the plug-in board is detachably plugged into the slot.

9. The safety helmet according to claim 5, characterized in that: It also includes a photovoltaic panel. The housing is provided with a positioning groove. The photovoltaic panel is inserted into the positioning groove. The photovoltaic panel is electrically connected to the driver.

10. The safety helmet according to claim 1, characterized in that: It also includes a limiting strap, the shell is provided with a slot, the two ends of the limiting strap are correspondingly connected to the slot, the limiting strap is provided with a plurality of ventilation holes, and the plurality of ventilation holes are arranged at equal intervals.

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