Protective earmuff head band and headphone

Abstract

The invention discloses a protective earmuff head band and a headphone, and relates to the technical field of electronic products, the protective earmuff head band comprises an elastic head beam, the elastic head beam comprises a first arc-shaped clamping section, an arc-shaped deformation section and a second arc-shaped clamping section which are connected in sequence, and a through groove is formed in the center area of the arc-shaped deformation section in a penetrating mode; a strip-shaped partition part is arranged in the middle of the through groove in the width direction in a protruding mode, the through groove is symmetrically divided into a left groove body and a right groove body through the strip-shaped partition part, and clamping grooves are formed in the side wall, away from the right groove body, of the left groove body and the side wall, away from the left groove body, of the right groove body. A traditional sliding block adjusting scheme is abandoned, the design of rotation of the adjusting shaft and linkage of the clamping force pieces is adopted, the clamping force pieces are connected with the strip-shaped separation parts only through the single-point adjusting shaft, thickness superposition is not formed between the clamping force pieces and the arc-shaped deformation sections in the whole process, it is guaranteed that clamping force adjustment is only guided by the size of the deformable area, and the adjusting effect is consistent with the height expected by a user.

Description

Technical Field

[0001] This invention relates to the field of electronic product technology, specifically to a protective earmuff headband and a headset. Background Technology

[0002] As a core component of head-mounted protective equipment (such as noise-canceling earmuffs and industrial protective earmuffs) or audio equipment (such as headphones), protective earmuffs and headbands are typically made of steel. In related technologies, headbands are designed to deform slightly when worn and elastically return to their original shape when removed, allowing for repeated use without significant deformation. However, headbands are manufactured with pre-calibrated rigidity and curvature. Since head circumferences vary considerably among users of different ages, genders, and ethnicities, the same model of headphones may feel too loose on some users, while others may find the headband too tight.

[0003] A search revealed that patent publication number CN115633286B discloses a clamping force adjustment structure and a headphone. This patent uses a "sliding slider to change the equivalent width" adjustment method to adjust the elastic deformation of the headband at the connecting section, thereby adjusting the clamping force of the headband on the head and improving the wearing experience of users with different head sizes wearing headphones with this headband structure.

[0004] However, this patented solution has a key technical flaw: when the slider slides along the connecting section and leaves the opening, it does not completely detach from the connecting section, but remains connected to both sides of the connecting section through hook-like structures at both ends. If the headband is stretched at both ends when worn by the user, the connecting section and the slider will undergo coordinated deformation. This coordinated deformation results in the connecting section's stress-bearing cross-section not being a single cross-section, but rather a combined cross-section of the connecting section and the slider. This causes the effective thickness of the connecting section to change from its own material thickness to the sum of the connecting section's thickness and the slider's thickness. According to basic principles of material mechanics, the bending stiffness of beams or plates is proportional to the square of their thickness. This means that a small increase in thickness can lead to a significant increase in stiffness. In this state, although the equivalent width is reduced due to the exposed opening, the increase in stiffness caused by the effective thickness will offset or even exceed the weakening effect of the reduced width on stiffness. When users with large head circumferences expect to reduce the clamping force by adjusting the slider, the actual clamping force is significantly different from the expected effect, failing to achieve the ideal fit. Summary of the Invention

[0005] The purpose of this invention is to provide a protective earmuff headband and a headset to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The present invention provides a protective earmuff headband, comprising: The elastic head beam includes a first arc-shaped clamping section, an arc-shaped deformation section and a second arc-shaped clamping section connected in sequence. A through groove is provided in the central area of ​​the arc-shaped deformation section. A strip-shaped dividing part is provided in the middle of the through groove along its width direction. The strip-shaped dividing part symmetrically divides the through groove into a left groove and a right groove. The side wall of the left groove away from the right groove and the side wall of the right groove away from the left groove are both provided with snap-fit ​​grooves. The clamping force adjustment assembly includes an adjustment shaft that vertically penetrates the bearing portion and rotatably engages with the bearing portion, and a clamping plate fixed to the bottom end of the adjustment shaft; the clamping plate includes a strip-shaped bearing strip extending along the width direction of the through groove, and elastic strips that are uniformly arrayed along the length direction of the strip-shaped bearing strip and symmetrically protruding on both sides thereon, and the free end of the elastic strip away from the strip-shaped bearing strip is provided with a hook that matches the shape of the snap-fit ​​groove; The clamping plate can rotate around the central axis of the adjusting shaft so that the hook of the elastic strip can selectively engage with the locking groove, thereby changing the effective bending stiffness of the arc-shaped deformation segment.

[0007] Furthermore, the arc-shaped deformation segment has an arched structure that is high in the middle and low at both ends. The length of the through groove does not exceed 1 / 2 of the length of the arc-shaped deformation segment, and the width of the through groove does not exceed 1 / 3 of the width of the arc-shaped deformation segment.

[0008] Furthermore, the elastic strip and the strip-shaped load-bearing strip are integrally formed, and the thickness of the strip-shaped load-bearing strip increases continuously from its two ends to the middle to form an isosceles triangular structure.

[0009] Furthermore, the snap-fit ​​groove is an arc-shaped groove arranged circumferentially along the inner side of the arc-shaped deformation section, the snap hook is an arc-shaped structure adapted to the arc-shaped groove, and the surface of the snap hook is provided with an elastic rubber layer.

[0010] Furthermore, it also includes a protective sleeve for wrapping the headband, and the protective sleeve has a through hole for the adjustment shaft to extend from the corresponding adjustment shaft. The top end of the adjustment shaft extends out of the through hole and is coaxially fixed with a knob. The outer circumferential surface of the knob is provided with anti-slip texture, and its diameter is larger than the diameter of the adjustment shaft.

[0011] Furthermore, the opposite ends of the first arc-shaped clamping section and the second arc-shaped clamping section extend from the end of the protective sleeve to form a connecting section, and both the first arc-shaped clamping section and the second arc-shaped clamping section are covered with an isolation sleeve.

[0012] Furthermore, the width of the left groove is equal to that of the right groove, and the number of elastic strips is 4-8, with the elastic strips on both sides corresponding to each other.

[0013] Furthermore, the supporting part and the arc-shaped deformation segment are integrally formed, the thickness of the supporting part is greater than the thickness of the arc-shaped deformation segment, and the supporting part is provided with a rotating hole for the adjusting shaft to pass through, and the inner wall of the rotating hole is provided with a wear-resistant coating.

[0014] A type of over-ear headphone includes the aforementioned protective earcups, headband, and sound-generating assembly. The sound-generating assembly includes a left sound-generating module and a right sound-generating module. The left and right sound-generating modules are detachably connected to opposite ends of two isolation sleeves, and when the elastic headband is in its normal state, the left and right sound-generating modules are in contact with each other.

[0015] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. This invention abandons the traditional slider adjustment scheme and adopts a design of adjustment shaft rotation + clamping plate linkage. The clamping plate is only connected to the strip-shaped partition through a single-point adjustment shaft, and does not form thickness superposition with the arc-shaped deformation section throughout the process, ensuring that the clamping force adjustment is only dominated by the size of the deformable area, and the adjustment effect is highly consistent with the user's expectations. 2. The elastic strips of this invention are uniformly arrayed along the strip-shaped load-bearing strips. Users can adjust the clamping force in multiple levels by controlling the number of elastic strips inserted into the clamping slot, covering the full range of needs from small head circumference to large head circumference, and significantly improving the fitting accuracy.

[0016] 3. The elastic head beam of this invention adopts an integrated molding process. The arc-shaped deformation section is divided into symmetrical left and right grooves by strip-shaped partitions, which can not only enhance the overall rigidity and suppress torsional collapse, but also disperse deformation energy, avoid the stress concentration problem of traditional single opening, and extend the service life of the head beam.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a first-view structural schematic diagram of the elastic head beam of the present invention; Figure 2 This is a schematic diagram of the elastic head beam structure from a second perspective of the present invention; Figure 3 This is a first-view structural schematic diagram of the elastic head beam and clamping force adjustment assembly of the present invention; Figure 4 This is a second-view structural schematic diagram of the elastic head beam and clamping force adjustment assembly of the present invention; Figure 5This is a schematic diagram of the clamping force adjustment component structure of the present invention; Figure 6 This is a schematic diagram of the structure of the over-ear headphones of the present invention; Figure 7 This is a cross-sectional structural diagram of the headphones of the present invention.

[0020] In the picture: 1-Elastic head beam; 11-First arc-shaped clamping section; 12-Arch-shaped deformation section; 121-Through groove; 1211-Left groove; 1212-Right groove; 122-Strip-shaped partition; 13-Second arc-shaped clamping section; 14-Snap-fit ​​groove; 2-Clamping force adjustment assembly; 21-Adjusting shaft; 22-Clamping force plate; 221-Strip-shaped load-bearing strip; 222-Elastic strip; 223-Hook; 3-Knob; 4-Isolation sleeve; 5-Protective sleeve; 6-Left sound-generating module; 7-Right sound-generating module. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] Please see Figures 1-7 The protective earmuff headband provided by this invention aims to accurately fit different head circumferences and balance wearing stability and comfort. It includes two main modules: an elastic headband 1 and a clamping force adjustment component 2. Through the cooperation between the two structures, the elastic headband 1 achieves a stable fit to the head by means of adaptive deformation, and the clamping force adjustment component 2 precisely adjusts to meet the needs of different users' head circumferences, ultimately achieving a comfortable wearing effect.

[0023] The elastic headband 1 serves as the main support frame of the headband, undertaking the dual functions of basic support and adaptive deformation. The elastic headband 1 adopts an integrated molding process to ensure structural integrity and fatigue resistance. The overall outline is an arc shape that conforms to the physiological curve of the human head, including a first arc-shaped clamping section 11, an arc-shaped deformation section 12, and a second arc-shaped clamping section 13 connected in sequence.

[0024] Among them, the first arc-shaped clamping segment 11 and the second arc-shaped clamping segment 13 are symmetrically distributed on both sides of the arc-shaped deformation segment 12, respectively corresponding to the temporal region on both sides of the head. Their arc curvature is adapted to the height of the temporal contour, and the two segments are completely symmetrical. The arc-shaped deformation segment 12, as the core deformation area, has a greater curvature than the clamping segments on both sides, and reserves sufficient deformation space, which can flexibly bend elastically according to the user's head circumference.

[0025] To optimize the performance of the arc-shaped deformation segment 12, a through groove 121 is opened through its central region. A thin strip-shaped dividing part 122 protrudes laterally along the headband in the middle of the through groove 121. The strip-shaped dividing part 122 is centrally located and evenly and symmetrically divides the through groove 121 into a left groove 1211 and a right groove 1212. On the one hand, it acts like a central skeleton to enhance the overall rigidity of the arc-shaped deformation segment 12, suppressing twisting or local collapse during repeated deformation, avoiding structural fatigue or permanent deformation, and extending service life. On the other hand, the symmetrical structure of the left groove 1211 and the right groove 1212 allows deformation energy to be evenly distributed to both sides, solving the problem of local stress concentration that is prone to occur in traditional single-opening structures, ensuring smooth deformation and a more durable structure.

[0026] In addition, to facilitate precise locking with the clamping force adjustment component 2, locking grooves 14 are provided on the side wall of the left groove 1211 away from the right groove 1212 and the side wall of the right groove 1212 away from the left groove 1211. The ends of the locking grooves 14 are polished to form a smooth guide surface, which guides the hooks 223 of the clamping force adjustment component 2 to slide in smoothly, reducing frictional resistance, avoiding adjustment jamming, and improving the smoothness of operation.

[0027] The clamping force adjustment component 2 is the core for achieving precise clamping force control. It includes an adjustment shaft 21 and a clamping plate 22, which are fixedly connected by welding or integral molding to form a synchronous linkage structure to ensure efficient transmission of adjustment force.

[0028] The adjusting shaft 21 vertically penetrates the strip-shaped partition 122 and achieves rotational engagement with the strip-shaped partition 122 through bearings, converting sliding friction into rolling friction. This ensures smooth and uninterrupted rotation, requiring only a small external force for adjustment, significantly reducing component wear and improving long-term reliability. The clamping plate 22 is fixed to the bottom end of the adjusting shaft 21 and extends along the width of the through groove 121. Specifically, the clamping plate 22 includes a strip-shaped load-bearing strip 221 and an elastic strip 222. The load-bearing strip 221 acts as the main force transmission axis, evenly distributing the force input from the adjusting shaft 21 to the elastic strips 222 on both sides, avoiding adjustment deviations caused by uneven force distribution. The elastic strip 222 adopts a thin and lightweight design, ensuring sufficient constraint strength while quickly returning to its original shape after deformation, preventing elastic failure. The free end of the elastic strip 222 away from the strip-shaped load-bearing strip 221 is integrally formed with a hook 223 that is adapted to the snap-fit ​​groove 14. The end of the hook adopts a rounded transition design to reduce friction damage and forms a barb-like fit with the snap-fit ​​groove 14 to enhance the locking effect after snap-fit, prevent accidental disengagement during use, and ensure the stability of clamping force adjustment.

[0029] The core of the headband's clamping force adjustment revolves around the effective bending stiffness control of the arc-shaped deformation section 12. When the user needs to increase the clamping force to adapt to a small head circumference, the adjustment shaft 21 is rotated, causing the clamping plate 22 to rotate synchronously. The hook 223 at the end of the elastic strip 222 slides into the groove along the guide surface of the locking groove 14. After locking, the elastic strip 222 forms a "reinforcing rib" in the left groove 1211 and right groove 1212 areas, significantly improving the bending stiffness of the arc-shaped deformation section 12, increasing the clamping force, and tightly fitting the head of the user with a small head circumference to prevent slippage. When the clamping force needs to be reduced to adapt to a large head circumference, the adjustment shaft 21 is rotated in the opposite direction, the hook 223 disengages from the locking groove 14, the constraint of the elastic strip 222 on the arc-shaped deformation section 12 is released, the deformable area returns to its maximum range, the bending stiffness decreases, the clamping force weakens, and it adapts to the head contour of the user with a large head circumference.

[0030] In addition, the elastic strips 222 are evenly distributed in an array along the length of the strip-shaped load-bearing strip 221. Users can adjust the number of elastic strips 222 inserted to achieve multiple levels. By controlling the number of elastic strips 222 inserted, the fitting needs from small head circumference to large head circumference can be covered, improving the accurate fit for different users.

[0031] It is worth noting that during the process of the hooks 223 of the elastic strip 222 sliding into the locking groove 14, the hooks 223 on both sides of the clamping plate 22 do not randomly enter the locking groove 14, but are precisely symmetrically distributed. The hooks 223 of the left elastic strip 222 will slide into the left end area of ​​the left groove 1211 locking groove 14, and the hooks 223 of the right elastic strip 222 will slide into the right end area of ​​the right groove 1212 locking groove 14. This design is to ensure the absolute symmetry of the force on both sides when the clamping force is adjusted. When the hooks 223 are respectively embedded in the left and right ends of the locking groove 14, the constraint points of the elastic strip 222 on the outer walls of the left groove 1211 and the right groove 1212 will be evenly distributed along the longitudinal direction of the arc-shaped deformation section 12, so that the deformation areas corresponding to the left groove 1211 and the right groove 1212 are symmetrically reduced, avoiding the headband tilt caused by excessive constraint on one side. Meanwhile, this left-to-left and right-to-right snap-fit ​​method allows the adjustment force transmitted by the strip-shaped load-bearing strip 221 to be evenly applied to the arc-shaped deformation section 12 through the elastic strips 222 on both sides, ensuring that the clamping force on both sides of the headband remains balanced. This prevents one side from being too tight and the other from being too loose, and also allows the bending stiffness of the arc-shaped deformation section 12 to be evenly increased or decreased overall, further enhancing the stability and fit when wearing the headband. This allows users with different head sizes to obtain a symmetrical and comfortable clamping experience after adjustment.

[0032] Compared to existing technologies that use sliders to adjust clamping force by changing the equivalent width, this invention avoids the core defects through structural innovation. In existing technologies, when the slider leaves the opening, it forms a combined section with the connecting section, resulting in an effective thickness overlap. The square effect of thickness on stiffness offsets the effect of the reduced equivalent width, causing the clamping force adjustment to fall short of expectations. In this invention, the arc-shaped deformation section 12 is divided into a left groove 1211 and a right groove 1212 by a strip-shaped dividing part 122. The clamping plate 22 is only connected to the strip-shaped dividing part 122 through a single-point adjustment shaft 21, and does not form overlapping contact with the arc-shaped deformation section 12 in the thickness direction throughout the process. The effective thickness is always the thickness of the arc-shaped deformation section 12 itself, ensuring that the clamping force adjustment is only dominated by the size of the deformable area and is not affected by the thickness overlap. The adjustment effect is highly consistent with the user's expectations. At the same time, the rotation adjustment shaft 21 drives the rotation adjustment of the clamping plate 22, which is easier to achieve precise control than slider adjustment, and the operation is smooth and stable, improving the reliability and convenience of adjustment.

[0033] To further improve performance, this embodiment has made multiple optimizations to the basic structure. The arc-shaped deformation segment 12 is designed as an arch structure with a high middle and low ends to fit the top contour of the head. The length of the through groove 121 does not exceed 1 / 2 of the length of the arc-shaped deformation segment 12 and the width does not exceed 1 / 3 of the width of the arc-shaped deformation segment 12. While retaining the necessary deformation space, it ensures that the arch structure has sufficient rigidity to avoid insufficient clamping force and to disperse the deformation energy to the whole area, thereby reducing fatigue deformation.

[0034] In this embodiment, the elastic strip 222 and the strip-shaped load-bearing strip 221 are integrally formed, and the thickness of the strip-shaped load-bearing strip 221 increases continuously from both ends to the middle to form an isosceles triangle structure. The integral forming design of the elastic strip 222 and the strip-shaped load-bearing strip 221 can eliminate the weak links of the separate connection, ensure the continuity of force transmission and structural stability between the elastic strip 222 and the strip-shaped load-bearing strip 221, and avoid clamping force adjustment failure caused by connection failure during long-term use. The isosceles triangle thickness structure of the strip-shaped load-bearing strip 221 makes the middle force concentration area more rigid due to the increasing thickness, which can accurately transmit the force input by the adjustment shaft 21 without deformation, ensuring the accuracy of force transmission.

[0035] In this embodiment, the snap-fit ​​groove 14 is an arc-shaped groove arranged circumferentially along the inner side of the arc-shaped deformation section 12, and the snap hook 223 is an arc-shaped structure adapted to the arc-shaped groove, with an elastic rubber layer on its surface. Compared to the point and line contact between a traditional straight groove and a straight hook, the arc-shaped contact allows for a more secure snap-fit, effectively preventing the snap hook 223 from coming off due to slight shaking or head movement when wearing the headband, ensuring stability after clamping force adjustment. At the same time, the elastic rubber layer on the surface of the snap hook 223 serves as a functional medium, isolating the snap hook 223 (mostly made of metal) from direct rigid contact with the snap-fit ​​groove 14, preventing scratches and wear on the groove wall caused by the metal snap hook 223 during long-term repeated adjustments, reducing component wear, and extending the overall service life.

[0036] In this embodiment, a protective sleeve 5 for wrapping the headband is also included. The protective sleeve 5 has a through hole corresponding to the adjustment shaft 21 for the adjustment shaft 21 to extend out. The top end of the adjustment shaft 21 extends out of the through hole and is coaxially fixed with a knob 3. The outer circumferential surface of the knob 3 is provided with anti-slip texture, and its diameter is larger than the diameter of the adjustment shaft 21. The protective sleeve 5 can isolate the headband from external friction and sweat, preventing wear and tear on the headband. Its material can also improve the comfort of head contact. The through hole design ensures that the adjustment shaft 21 can extend normally without affecting the wrapping effect of the protective sleeve 5. The coaxially fixed knob 3, because its diameter is larger than that of the adjustment shaft 21, greatly increases the operating contact area, making it easier for users to apply force. The outer anti-slip texture can increase the friction between the hand and the knob 3, preventing slippage during rotation adjustment, making clamping force adjustment more convenient and effortless.

[0037] In this embodiment, the opposite ends of the first arc-shaped clamping section 11 and the second arc-shaped clamping section 13 extend from the end of the protective sleeve 5 to form a connecting section, and both the first arc-shaped clamping section 11 and the second arc-shaped clamping section 13 are covered with an isolation sleeve 4. The covering isolation sleeve 4 can isolate the clamping section from direct contact with the skin, reduce the pressure of the hard material on the temporal region, disperse the clamping force to avoid local pressure concentration, and at the same time prevent sweat from corroding the clamping section to delay material aging, making long-term wear more comfortable, and also ensuring the stability and practicality of the overall structure after connecting the earmuff. In this embodiment, the widths of the left groove 1211 and the right groove 1212 are equal, and the number of elastic strips 222 is 4-8, with each side of the elastic strips 222 corresponding to the other. By controlling the number of elastic strips 222 that engage with the locking grooves 14 on each side (e.g., engaging 1 for low clamping force, engaging 2-3 for medium clamping force, and engaging 4 for high clamping force), a multi-level clamping force adjustment range is formed, covering different fitting needs from small head circumference to large head circumference. On the other hand, the one-to-one arrangement ensures that the adjustment force is evenly applied to the left groove 1211 and the right groove 1212 through the elastic strips 222, avoiding excessive elastic strips 222 on one side that could cause clamping force skew, and ensuring that the clamping force on both sides of the headband is always balanced.

[0038] In this embodiment, the strip-shaped partition 122 and the arc-shaped deformation section 12 are integrally formed. The thickness of the strip-shaped partition 122 is greater than the thickness of the arc-shaped deformation section 12, and the strip-shaped partition 122 has a rotating hole through which the adjusting shaft 21 passes. The inner wall of the rotating hole is provided with a wear-resistant coating. The integral formation of the strip-shaped partition 122 and the arc-shaped deformation section 12 can eliminate the connection gaps and weak points caused by separate connections (such as bolt fixing or bonding), allowing the force of the adjusting shaft 21 to be directly transmitted to the arc-shaped deformation section 12, thereby improving the stability of the overall structure. The greater thickness of the strip-shaped partition 122 compared to the arc-shaped deformation section 12 can enhance the structural rigidity of the strip-shaped partition 122 without affecting the deformability of the arc-shaped deformation section 12, preventing the strip-shaped partition 122 from deforming due to force when the adjusting shaft 21 rotates, ensuring the coaxiality of the rotating hole and the adjusting shaft 21, and preventing adjustment jamming.

[0039] The present invention also provides a headset, including the aforementioned protective earcups and headband, and a sound-generating assembly consisting of a left sound-generating module 6 and a right sound-generating module 7. The left sound-generating module 6 and the right sound-generating module 7 are detachably connected to opposite ends of two isolation sleeves 4, allowing for replacement or maintenance without damaging the headband structure. When the elastic headband 1 is in its normal state (not subjected to external force stretching), the left sound-generating module 6 and the right sound-generating module 7 fit together, significantly reducing the storage volume. When wearing the headset again, simply opening the headband allows the sound-generating modules to naturally unfold with the clamping section and precisely fit the ears without additional adjustment, improving ease of use. This headset inherits the clamping force adjustment advantage of the protective earcups and headband, and also balances functionality, storage convenience, and maintenance convenience through the optimized design of the sound-generating modules.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A protective earmuff headband, characterized in that, include: The elastic head beam includes a first arc-shaped clamping section, an arc-shaped deformation section and a second arc-shaped clamping section connected in sequence. A through groove is provided in the central area of ​​the arc-shaped deformation section. A strip-shaped dividing part is provided in the middle of the through groove along its width direction. The strip-shaped dividing part symmetrically divides the through groove into a left groove and a right groove. The side wall of the left groove away from the right groove and the side wall of the right groove away from the left groove are both provided with snap-fit ​​grooves. The clamping force adjustment assembly includes an adjustment shaft that vertically penetrates the bearing portion and rotatably engages with the bearing portion, and a clamping plate fixed to the bottom end of the adjustment shaft; the clamping plate includes a strip-shaped bearing strip extending along the width direction of the through groove, and elastic strips that are uniformly arrayed along the length direction of the strip-shaped bearing strip and symmetrically protruding on both sides thereon, and the free end of the elastic strip away from the strip-shaped bearing strip is provided with a hook that matches the shape of the snap-fit ​​groove; The clamping plate can rotate around the central axis of the adjusting shaft so that the hook of the elastic strip can selectively engage with the locking groove, thereby changing the effective bending stiffness of the arc-shaped deformation segment.

2. The protective earmuff headband according to claim 1, characterized in that, The arc-shaped deformation section has an arched structure that is high in the middle and low at both ends. The length of the through groove does not exceed 1 / 2 of the length of the arc-shaped deformation section, and the width of the through groove does not exceed 1 / 3 of the width of the arc-shaped deformation section.

3. The protective earmuff headband according to claim 1, characterized in that, The elastic strip and the strip-shaped load-bearing strip are integrally formed, and the thickness of the strip-shaped load-bearing strip increases continuously from its two ends to the middle to form an isosceles triangle structure.

4. The protective earmuff headband according to claim 1, characterized in that, The snap-fit ​​groove is an arc-shaped groove arranged circumferentially along the inner side of the arc-shaped deformation section, and the snap hook is an arc-shaped structure adapted to the arc-shaped groove, and the surface of the snap hook is provided with an elastic rubber layer.

5. The protective earmuff headband according to claim 1, characterized in that, It also includes a protective sleeve for wrapping the headband, and the protective sleeve has a through hole for the adjustment shaft to extend out at the corresponding position. The top end of the adjustment shaft extends out of the through hole and is coaxially fixed with a knob. The outer circumferential surface of the knob is provided with anti-slip texture, and its diameter is larger than the diameter of the adjustment shaft.

6. The protective earmuff headband according to claim 5, characterized in that, One end of the first arc-shaped clamping section and the second arc-shaped clamping section opposite to each other extends from the end of the protective sleeve to form a connecting section, and both the first arc-shaped clamping section and the second arc-shaped clamping section are covered with an isolation sleeve.

7. The protective earmuff headband according to claim 1, characterized in that, The widths of the left groove and the right groove are equal, and the number of elastic strips is 4-8, with the elastic strips on both sides corresponding one-to-one.

8. The protective earmuff headband according to claim 1, characterized in that, The supporting part and the arc-shaped deformation section are integrally formed. The thickness of the supporting part is greater than the thickness of the arc-shaped deformation section. The supporting part is provided with a rotating hole for the adjusting shaft to pass through. The inner wall of the rotating hole is provided with a wear-resistant coating.

9. A type of over-ear headphone, characterized in that, The device includes the protective earmuff headband and sound-generating assembly as described in claim 6. The sound-generating assembly includes a left sound-generating module and a right sound-generating module. The left and right sound-generating modules are detachably connected to opposite ends of the two isolation sleeves, and when the elastic headband is in normal condition, the left and right sound-generating modules are in contact with each other.

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