Headset

Abstract

The utility model provides a headphone, and belongs to the technical field of teaching equipment. Comprising a control knob, a pressing pad and an outer ear pad, a left earphone is clamped to one side of the control knob, a tuning knob is rotationally connected to one side of the left earphone, an ear hoop is rotationally connected to the top of the left earphone, a telescopic piece is inserted into the top of the ear hoop, a head band is bonded to the top of the telescopic piece, and a head beam pad is bonded to the bottom of the head band. A right earphone is adhered to the other side of the headband, a headset is inserted into one side of the right earphone, and one side of the control knob is connected with the pressing assembly. According to the utility model, the pressing assembly is arranged, the movement of the pressing pad is adjusted by rotating the control knob, the outer ear pad is adjusted to a comfortable size through the linkage adjusting assembly, and the arranged sterilization assembly is extruded to spray alcohol to the inner ear pad for sterilization, so that secondary injury to students with ear injury is avoided; and the earphone wearing firmness is enhanced, and the earphone is convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching equipment, in particular to a headset. Background Art

[0002] Headphones are worn on the head instead of inserted into the ear canal. Different from in-ear headphones, this type of headphones avoids tightly plugging the opening of the external auditory canal and is almost in a closed state. The high-volume audio sound pressure directly enters the ear and is concentrated on the very thin eardrum. There is no room for buffering, which can easily cause pain in the external auditory canal over time.

[0003] English teaching is increasingly valued by parents, and schools are also paying more attention to foreign language learning in daily life. In daily English learning, headphones have become an indispensable tool for learning foreign languages, especially English dictation. Compared with classroom learning, most students have to concentrate on listening to the teacher. If they are distracted for a moment, they may not be able to keep up with the pace. The current headphone-based self-study method has greatly improved students' fun and concentration in learning alone.

[0004] However, if some students have ear injuries such as frostbite or accidental scratches while playing, they cannot use the existing headphones for learning. Continuing to wear the headphones will cause pressure on the ears, affect the blood circulation in the ears, and even cause pain, causing discomfort during the learning process, which is not conducive to learning and recovery.

[0005] At the same time, since the sizes of students' ears are different, the existing headphone has poor stability during learning and is easy to fall off, and the tightness needs to be adjusted frequently.

[0006] Therefore, the present application provides a headset to meet the needs. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a headset to solve the problem that some students cannot use the headset to study when their ears are damaged, such as frostbite or accidental scratches during play. If they continue to wear the headset, it will cause pressure on the ears, affect the blood circulation of the ears, and even cause pain, causing discomfort during the learning process, which is not conducive to learning and recovery.

[0008] At the same time, since the sizes of students' ears are different, the existing headphone has poor stability during learning and is easy to fall off, and the tightness needs to be adjusted frequently.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0010] A headset, comprising a control knob, a pressure pad and an outer ear pad, wherein a left earphone is clamped on one side of the control knob, a tuning knob is rotatably connected to one side of the left earphone, an ear hoop is rotatably connected to the top of the left earphone, a telescopic piece is plugged into the top of the ear hoop, a headband is bonded to the top of the telescopic piece, a head beam pad is bonded to the bottom of the headband, a right earphone is bonded to the other side of the headband, and an earphone is plugged into one side of the right earphone;

[0011] A pressing component, one side of the control knob is connected to a pressing component, and the pressing component is used to squeeze the internal space of the alcohol tank;

[0012] A sterilization component, a sterilization component is provided on one side of the pressing pad, and the sterilization component is used to sterilize the inner ear pad around one side;

[0013] An adjustment component is disposed inside the external ear pad and is used to adjust the size of the circumference of the external ear pad.

[0014] Optionally, the pressing assembly includes a pressing pad, one side of the pressing pad is threadedly connected to a threaded rod, one side of the threaded rod is installed with a turntable, the turntable is located inside the buckle sleeve, and one side of the turntable is provided with a rotating shaft.

[0015] Optionally, one side of the snap sleeve is snapped into the interior of the earphone housing and is rotatably connected to the turntable. A rotating shaft is installed on one side of the turntable, and a groove gear is installed on the surface of the rotating shaft.

[0016] Optionally, the groove gear is composed of two groups of gears of the same specification, and a rotating shaft is installed on the other side of the groove gear, and one side of the rotating shaft is welded to the axis of the control knob and protrudes from the axis of the control knob.

[0017] Optionally, the sterilization component includes an alcohol box, the surface of which is bonded to the inside of the snap sleeve, a liquid inlet is provided on one side, a liquid guide tube is provided at the bottom of the surface, and a liquid spray nozzle is provided on the surface of the liquid guide tube.

[0018] Optionally, the liquid guide tube is a U-shaped metal tube, and a plurality of groups of liquid spray nozzles with different angles are arranged on the surface of the liquid guide tube, and are distributed at equal intervals on the liquid guide tube on one side of the inner ear pad.

[0019] Optionally, the adjustment component includes an expansion coil, a fixture is provided on the surface of the expansion coil, a gear shaft is provided inside the fixture, a groove gear is provided on one side of the gear shaft, and a rack is provided on the surface of the groove gear.

[0020] Optionally, the interior of the fixture is a hollow slot body, in which the expansion coils are arranged, and a gear shaft is placed between each circle of expansion coils, and they are all in the fixture.

[0021] Optionally, the inner circle of the expansion roll fits with the inner side of the outer ear pad, and the outer ear pad is composed of a sponge. When the expansion roll contracts inwardly, it fits with the sponge and tightens inwardly.

[0022] Optionally, the fixed track is located on one side of the fixture and is connected thereto, and the internal rack closed loop is connected to the groove gear of the control knob, and the other end is connected to the groove gear of the gear shaft at the bottom of the fixture.

[0023] Compared with the prior art, the utility model has at least the following beneficial effects:

[0024] In the above scheme, by setting a pressing component and a sterilization component, using a control knob, and utilizing the cooperation between the pressing pad, the turntable and the threaded rod, the pressing pad is moved to one side, and the alcohol box on one side is squeezed, so that the alcohol inside the alcohol box can be squeezed and transmitted through the liquid guide tube at the bottom, and then a multi-directional spraying is performed through the liquid spray nozzle to disinfect the surroundings of the inner ear pad and the space inside the earphone with alcohol, thereby ensuring the use environment. During use, students can learn listening in a sterile environment, ensuring a good learning environment, and at the same time avoiding the earphones from compressing the blood vessels in the injured ear of the student, so that the student's ear will not be affected by long-term wearing during the learning process, thereby improving the wearing comfort and sterility.

[0025] By setting up an adjustment component, using an expansion roll, and utilizing the coordination of a fixer, an outer ear pad, and a rack, before students use the headset, they can adjust the control knob to drive the operation of the rack according to the size of their own ears, and adjust the tightening of the expansion roll to a state consistent with the size and comfort of their own ears. While adjusting the size, the pressing component is squeezed, and the internal environment of the headset is sterilized. This makes the headset suitable for wearing and prevents it from falling off, while also keeping the inside of the headset in a relatively hygienic state. It also solves the problem of loose wearing due to inappropriate size, which leads to falling off during use, indirectly contacting the ear and causing secondary damage, affecting the progress of learning, and improving learning interest and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the present invention and enable those skilled in the relevant art to make and use the present invention.

[0027] Figure 1 This is a schematic diagram of the main stereoscopic structure of the headset;

[0028] Figure 2 A schematic diagram of the front view of the headphone;

[0029] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the left earphone;

[0030] Figure 4 It is a three-dimensional enlarged structural diagram of the pressing component;

[0031] Figure 5 It is a schematic diagram of the stereoscopic structure of the sterilization component;

[0032] Figure 6 It is a schematic diagram of the three-dimensional enlarged structure of the adjustment component.

[0033] [reference numerals]

[0034] 1. Control knob; 2. Left earphone; 3. Right earphone; 4. Tuning knob; 5. Ear hoop; 6. Press assembly; 61. Press pad; 62. Threaded rod; 63. Turntable; 64. Buckle sleeve; 65. Rotating shaft; 66. Grooved gear; 7. Sterilization assembly; 71. Alcohol tank; 72. Liquid inlet; 73. Liquid guide tube; 74. Liquid spray nozzle; 75. Inner ear pad; 8. Adjustment assembly; 81. Expansion roll; 82. Fixer; 83. Geared rotating shaft; 84. Rack; 85. Outer ear pad; 86. Fixed turntable; 9. Telescopic part; 10. Headband; 11. Headband pad; 12. Earphone.

[0035] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0036] The following is a detailed description of a headset provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0037] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0038] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0039] It is to be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0040] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0041] like Figures 1 to 6 As shown, an embodiment of the utility model provides a headset, comprising a control knob 1, a left earphone 2 is clamped on one side of the control knob 1, a tuning knob 4 is rotatably connected to one side of the left earphone 2, an ear hoop 5 is rotatably connected to the top of the left earphone 2, a telescopic member 9 is plugged into the top of the ear hoop 5, a headband 10 is bonded to the top of the telescopic member 9, a headband pad 11 is bonded to the bottom of the headband 10, a right earphone 3 is bonded to the other side of the headband 10, and an earphone 12 is plugged into one side of the right earphone 3;

[0042] A pressing component 6, a pressing component 6 is connected to one side of the control knob 1, and the pressing component 6 is used to squeeze the internal space of the alcohol tank 71;

[0043] Sterilization component 7: A sterilization component 7 is provided on one side of the pressing pad 61, and the sterilization component 7 is used to sterilize the inner ear pad 75;

[0044] Adjustment component 8: An adjustment component 8 is disposed inside the external ear pad 85, and the adjustment component 8 is used to adjust the size of the circumference of the external ear pad 85.

[0045] By setting a pressing component 6, when adjusting the headphone, the pressing component 6 is adjusted by controlling the knob 1 to rotate the turntable 63, driving the threaded rod 62 on one side to rotate, driving the pressing pad 61 to move toward the sterilization component 7, and squeezing is generated when it contacts the alcohol box 71. The alcohol box 71 shrinks the alcohol and flows it to the bottom to the liquid guide tube 73. After flowing to the liquid dispensing nozzle 74, it is sprayed around the inner ear pad 75 in different angles. By setting an adjusting component 8, the groove gear 66 rotates while the control knob 1 is rotated and adjusted, and the rack 84 is driven to rotate at the same time. The gear shaft 83 in the fixer 82 rolls, driving the expansion roll 81 to tighten, driving the outer ear pad 85 to tighten inward, and adjusting to a comfortable angle during use, thereby improving the wearing stability. The rotation of the control knob 1 drives the sterilization component 7 and the adjusting component 8 to operate at the same time. The operation is simple and the efficiency is improved. While making the headphones comfortable to wear, the sanitary environment for the use of the headphones is improved.

[0046] As an implementation method in this embodiment, Figure 3 and Figure 4 As shown, the pressing assembly 6 includes a pressing pad 61, one side of the pressing pad 61 is threadedly connected to a threaded rod 62, one side of the threaded rod 62 is installed with a turntable 63, the turntable 63 is located inside a snap sleeve 64, one side of the turntable 63 is provided with a rotating shaft 65, one side of the snap sleeve 64 is snapped into the interior of the earphone housing and is rotatably connected to the turntable 63, one side of the turntable 63 is installed with a rotating shaft 65, the surface of the rotating shaft 65 is installed with a groove gear 66, the groove gear 66 is composed of two groups of gears of the same specification, and the other side of the groove gear 66 is installed with a rotating shaft 65, one side of the rotating shaft 65 is welded to the axis center of the control knob 1, and protrudes from the axis center of the control knob 1.

[0047] In this embodiment, the student first holds the left earphone 2 and the right earphone 3 in his hand through the headband 10, and rotates the control knob 1 to drive the shaft 65 to rotate. At the same time, the groove gear 66 starts to rotate on one side of the shaft 65, and the buckle sleeve 64 is fixedly connected to the earphone shell, so that the force driven by the shaft 65 to rotate is transmitted to the turntable 63 clamped inside the buckle sleeve 64. At the same time, the operation of the turntable 63 drives the threaded rod 62 to move forward, so that the pressing pad 61 is pushed and starts to move parallel to one side. After contacting the alcohol tank 71, it squeezes it and changes the internal space volume, so that the internal pressure is generated to squeeze the alcohol outward to achieve a spraying state. By setting the cooperation between the pressing pad 61 and the threaded rod 62, the rotational force generated by the control knob 1 drives the rotating shaft 65 and the turntable 63 to rotate, so that the internal space volume of the alcohol tank 71 can be changed to achieve a spraying state. At the same time, after use, the control knob 1 can be rotated in the opposite direction again to make the pressing component 6 reversely operate to restore the internal space volume of the alcohol tank 71. The operation is simple and the effect is obvious.

[0048] As an implementation method in this embodiment, Figure 3 and Figure 5 As shown, the sterilization component 7 includes an alcohol tank 71, the surface of the alcohol tank 71 is bonded to the inside of the snap sleeve 64, and a liquid inlet 72 is provided on one side, and a liquid guide tube 73 is provided at the bottom of the surface, and a liquid spray nozzle 74 is provided on the surface of the liquid guide tube 73. The liquid guide tube 73 is a U-shaped metal tube, and a plurality of groups of liquid spray nozzles 74 with different angles are provided on the surface, and are distributed at equal intervals on the liquid guide tube 73 on one side of the inner ear pad 75.

[0049] In the present embodiment, the alcohol tank 71 is squeezed by the pressing pad 61, resulting in the reduction of the internal space of the alcohol tank 71. Affected by the volume of the space, the alcohol flows to the bottom liquid guide tube 73 and is continuously squeezed. The internal space of the liquid guide tube 73 is relatively slender and has a large pressure bearing capacity. The alcohol flows to the top liquid spray nozzle 74 through the liquid guide tube 73. The alcohol is sprayed in different directions by multiple groups of liquid spray nozzles 74 in different directions. By providing the liquid guide tube 73 and the liquid spray nozzle 74, the alcohol can be made to flow to the bottom of the liquid guide tube 73 by utilizing the reduction of the squeezed space inside the alcohol tank 71. As a result, when the alcohol inside the liquid guide tube 73 is affected, the liquid spray nozzle can spray in a spray shape due to its small outlet, thereby achieving a significant sterilization effect.

[0050] As an implementation method in this embodiment, Figure 3 and Figure 6As shown, the adjustment assembly 8 includes an expansion roll 81, a fixture 82 is provided on the surface of the expansion roll 81, a gear shaft 83 is provided inside the fixture 82, a groove gear 66 is provided on one side of the gear shaft 83, a rack 84 is provided on the surface of the groove gear 66, the inside of the fixture 82 is a hollow groove, the expansion roll 81 is arranged therein, and the gear shaft 83 is placed between each circle of the expansion roll 81, and they are all in the fixture 82. The inner circle of the expansion roll 81 fits with the inner side of the outer ear pad 85, and the outer ear pad 85 is composed of a sponge. When the expansion roll 81 contracts inwardly, it will fit the sponge and tighten inwardly. The fixed turntable 86 is located on one side of the fixture 82 and is connected thereto, and the internal rack 84 is closed-loop connected to the groove gear 66 of the control knob 1, and the other end is connected to the groove gear 66 of the gear shaft 83 at the bottom of the fixture 82.

[0051] In this embodiment, when students are ready to wear headphones, they can adjust and rotate the control knob 1 to adjust the largest size of the external ear pad 85 according to the size of their own ears, driving the groove gear 66 on one side of the shaft 65 to rotate. While the groove gear 66 rotates, the rack 84 attached to the inside operates inside the fixed shaft 86. While the rack 84 operates, it drives the gear shaft 83 at the bottom of the holder 82 to rotate. The rotation of the gear shaft 83 drives the expansion roll 81 in the holder 82 to tighten. After the expansion roll 81 operates, it drives the external ear pad 85 to retract inward, and it will not fall off when worn at this time. After use, the control knob 1 is rotated in the opposite direction, so that the groove gear 66 drives the rack 84 to operate, and then the expansion roll 81 expands outward to restore the size of the external ear pad 85. By setting the coordination between the rack 84 and the gear shaft 83, the expansion roll 81 can be caused to shrink or expand under the action of the gear shaft 83, so that the external ear pad 85 can be retracted or stretched after being acted upon by the expansion roll 81.

[0052] According to the working principle of the utility model, the student first puts the earphone on the head through the headband 10 so that the head is against the head beam pad 11, and then adjusts the telescopic member 9 to the size of the head, adjusts the left earphone 2 and the right earphone 3 in turn, rotates the control knob 1, and drives the rotating shaft 65 to rotate while rotating. At the same time, the groove gear 66 starts to rotate on one side of the rotating shaft 65. The buckle sleeve 64 is fixedly connected to the earphone shell, so that the rotation force driven by the rotating shaft 65 is transmitted to the turntable 63 clamped inside the buckle sleeve 64. At the same time, the operation of the turntable 63 drives the threaded rod 62 to move forward, so that the pressing pad 61 The alcohol box 71 is squeezed by the pressing pad 61, and the internal space of the alcohol box 71 is reduced. Affected by the space volume, the alcohol flows to the bottom liquid guide tube 73 and is continuously squeezed. The internal space of the liquid guide tube 73 is relatively slender and has a large pressure bearing capacity. The alcohol flows to the top liquid spray nozzle 74 through the liquid guide tube 73. Since the liquid spray nozzle 74 has multiple groups and is in different directions, the alcohol will be sprayed in different directions. When students wear headphones, the outer ear pad 85 In the state of maximum size, when the control knob 1 is adjusted and rotated, the groove gear 66 on one side of the shaft 65 rotates, and the rack 84 attached to the inside operates inside the fixed shaft 86 at the same time. When the rack 84 operates, it drives the gear shaft 83 at the bottom of the holder 82 to rotate. When the gear shaft 83 rotates, it drives the expansion roll 81 in the holder 82 to tighten. After the expansion roll 81 operates, it drives the outer ear pad 85 to retract inward. Students can adjust the tightening degree of the outer ear pad 85 according to the size of their own ears. At this time, it will not fall off when worn, and it can also protect the ears from secondary damage and avoid compression of the blood vessels in the ears. In this way, by adjusting the control knob 1, the ear can be sterilized while adjusting the size of the outer ear pad 85 to achieve wearing comfort. After the study is completed, the control knob 1 is rotated in the opposite direction to make the groove gear 66 drive the rack 84 to operate, and then the expansion roll 81 expands outward to restore the size of the outer ear pad 85, and the pressing pad 61 contracts inward, so that the alcohol tank 71 slowly increases in volume. After the volume is restored, it is affected by the weight of the alcohol itself and always remains at the bottom of the alcohol tank 71. When it is used again next time, the volume inside the alcohol tank 71 is still fixed. After the alcohol is injected through the liquid inlet 72, it can be used multiple times to complete the reset operation.

[0053] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A headset, characterized in that: The invention comprises a control knob, a pressure pad and an outer ear pad, wherein a left earphone is clamped on one side of the control knob, a tuning knob is rotatably connected to one side of the left earphone, an ear hoop is rotatably connected to the top of the left earphone, a telescopic piece is plugged into the top of the ear hoop, a headband is bonded to the top of the telescopic piece, a head beam pad is bonded to the bottom of the headband, a right earphone is bonded to the other side of the headband, and an earphone is plugged into one side of the right earphone; It also includes a pressing component, one side of the control knob is connected to the pressing component, and the pressing component is used to squeeze the internal space of the alcohol tank; A sterilization component, a sterilization component is provided on one side of the pressing pad, and the sterilization component is used to sterilize the inner ear pad around one side; An adjustment component is provided inside the external ear pad, and the adjustment component is used to adjust the size of the circumference of the external ear pad.

2. The headset according to claim 1, characterized in that: The pressing assembly comprises a pressing pad, one side of the pressing pad is threadedly connected with a threaded rod, one side of the threaded rod is installed with a turntable, the turntable is located inside the buckle sleeve, and one side of the turntable is provided with a rotating shaft.

3. The headset according to claim 2, characterized in that: One side of the buckle sleeve is clamped in the interior of the earphone housing and is rotatably connected to the turntable. A rotating shaft is installed on one side of the turntable, and a groove gear is installed on the surface of the rotating shaft.

4. The headset according to claim 3, characterized in that: The groove gear is composed of two groups of gears of the same specification, and a rotating shaft is installed on the other side of the groove gear. One side of the rotating shaft is welded to the axis center of the control knob and protrudes from the axis center of the control knob.

5. The headset according to claim 4, characterized in that: The sterilization component includes an alcohol box, the surface of which is bonded to the inside of the snap sleeve, a liquid inlet is provided on one side, a liquid guide tube is provided at the bottom of the surface, and a liquid spray nozzle is provided on the surface of the liquid guide tube.

6. The headset according to claim 5, characterized in that: The liquid guide tube is a U-shaped metal tube, and a plurality of groups of liquid spray nozzles with different angles are arranged on the surface of the liquid guide tube, and the nozzles are distributed at equal intervals on the liquid guide tube on one side of the inner ear pad.

7. The headset according to claim 6, characterized in that: The adjustment component includes an expansion coil, a fixture is provided on the surface of the expansion coil, a gear shaft is provided inside the fixture, a groove gear is provided on one side of the gear shaft, and a rack is provided on the surface of the groove gear.

8. The headset according to claim 7, characterized in that: The interior of the fixture is a hollow tank, in which the expansion coil is arranged. A gear shaft is placed between each circle of expansion roll sheets, and the gear shafts are located in the holder together.

9. The headset according to claim 8, characterized in that: The inner circle of the expansion roll piece fits with the inner side of the outer ear pad, and the outer ear pad is composed of a sponge. When the expansion roll piece contracts inwardly, it fits with the sponge and tightens inwardly.

10. The headset according to claim 9, characterized in that: The fixed track is located on one side of the fixer and is connected therewith, and the internal rack closed loop is connected to the groove gear of the control knob, and the other end is connected to the groove gear of the gear shaft at the bottom of the fixer.

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