CN114302284A

CN114302284A - Can adjust headphone of earphone area length

Info

Publication number: CN114302284A
Application number: CN202111644952.3A
Authority: CN
Inventors: 曾德恩
Original assignee: Jiangxi Risound Electronics Co ltd
Current assignee: Jiangxi Risound Electronics Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-08

Abstract

The invention discloses a headset capable of adjusting the length of a headset band, which comprises two head beam plates, wherein a first extension plate is connected inside each of the two head beam plates in a sliding manner, a second extension plate is fixedly arranged at the bottom end of each head beam plate, a positioning block is sleeved on the outer side of the second extension plate, a receiver is fixedly arranged at the bottom end of the positioning block, the head beam plates are connected with the head beam plates through a clamping block mechanism, the second extension plates are connected with the positioning blocks through limiting mechanisms, protective cotton is connected with the receiver through the positioning mechanisms, a rack plate is arranged on the outer surface of the second extension plate, the clamping block mechanism comprises a first threaded rod, a handle is fixedly arranged at the top end of the first threaded rod, and a movable plate is arranged on the outer side of the first threaded rod. This can adjust headphone of earphone area length, convenient to use can be according to user's head surrounding degree, shape of face length and ear size adjustment the device, has improved user's comfort level, has improved the life of the device simultaneously.

Description

Can adjust headphone of earphone area length

Technical Field

The invention relates to the technical field of earphones, in particular to a headset with adjustable earphone belt length.

Background

The earphone is a pair of conversion units which receive the electric signals from the media player or receiver and convert them into audible sound waves by using a speaker near the ear. The earphone can be separated from the media player, can be connected by only using one plug, and can listen to the sound independently without influencing other people, however, the existing headset has the problems that the length of a head beam, the length of an earphone belt and the size of earphone cotton are fixed in the using process, the headset cannot be adjusted according to the size of the head of a user, the utilization rate is extremely low, and the using comfort level is low.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a headset capable of adjusting the length of a headset belt, which solves the problems that the length of a head beam, the length of the headset belt and the size of earphone cotton are fixed in the use process of the conventional headset, the conventional headset cannot be adjusted according to the size of the head of a user, the utilization rate is extremely low, and the use comfort is low.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a can adjust headphone of earphone zone length, includes first roof beam board, first roof beam board has two, two the inside sliding connection of first roof beam board has an extension plate No. one, the bottom fixed mounting of first roof beam board has No. two extension plates, the locating piece has been cup jointed in the outside of No. two extension plates, the bottom fixed mounting of locating piece has the earphone, first roof beam board passes through fixture block mechanism with first roof beam board and is connected, No. two extension plates pass through stop gear with the locating piece and are connected, the protection is cotton to be connected through positioning mechanism with the earphone, the surface of No. two extension plates is equipped with the rack board.

Preferably, fixture block mechanism includes a threaded rod, the top fixed mounting of a threaded rod has the handle, the movable plate is installed in the outside of a threaded rod, the equal fixed mounting in both sides of terminal surface has a connecting rod under the movable plate, the bottom swing joint of a connecting rod has No. two connecting rods, the bottom swing joint of No. two connecting rods has L type kelly, two the internally mounted of L type kelly has the fixed block that is located the head beam inboard portion.

Preferably, a threaded rod and handle structure as an organic whole, a threaded rod passes through roller bearing with the first roof beam board and is connected, a threaded rod passes through the thread groove with the movable plate and is connected, the movable plate passes through screw connection with a connecting rod, a connecting rod passes through the columnar order groove with the first roof beam board and is connected.

Preferably, a connecting rod and No. two connecting rods pass through the minor axis and are connected, No. two connecting rods pass through the minor axis with L type kelly and are connected, L type kelly passes through the minor axis with the fixed block and is connected, the fixed block passes through bolted connection with the inside of nose beam panel.

Preferably, stop gear includes the knob, the one end fixed mounting of knob has helical gear No. one, No. two helical gears are installed to the front end of helical gear, the preceding terminal surface swing joint of No. two helical gears has protruding wheel, the one end of protruding wheel articulates there is the connecting rod No. three, the top of connecting rod No. three articulates there is the push rod, the top fixed mounting of push rod has a spring, the outside fixed mounting of push rod has the bracing piece, the movable block is installed to the top of bracing piece, the top fixed mounting of movable block has flexible post, the outside fixed mounting of flexible post has No. two springs, the preceding terminal surface swing joint of movable block has the gag lever post.

Preferably, the knob is connected with the positioning block through a roller bearing, the knob and the first bevel gear are of an integrated structure, the first bevel gear is meshed with the second bevel gear, and the second bevel gear is connected with the convex wheel through a screw. The convex wheel is connected with the third connecting rod through a short shaft, the third connecting rod is connected with the push rod through a short shaft, and the push rod and the positioning block form a sliding structure.

Preferably, the first spring and the push rod form an elastic structure, the top end of the first spring is connected with the inner wall of the positioning block through a screw, the bottom end of the first spring is connected with the push rod through a screw, the push rod and the supporting rod are of an integrated structure, the moving block and the positioning block form a sliding structure, the moving block is connected with the positioning block through a slide way, one end of the telescopic column is connected with the moving block through a screw, the other end of the telescopic column is connected with the inner wall of the positioning block through a screw, one end of the second spring is connected with the moving block through a screw, the other end of the second spring is connected with the positioning block through a screw, the limiting rod is connected with the moving block through a short shaft, and the limiting rod is connected with the positioning block through a short shaft.

Preferably, positioning mechanism includes the threaded rod No. two, the top fixed mounting of threaded rod No. two has the handle, the wedge is installed to the bottom of threaded rod No. two, the internally mounted of wedge has two pulleys, the lower terminal surface swing joint of pulley has the locating lever, per two the inside fixed mounting of locating lever has No. three springs.

Preferably, No. two threaded rods and handle structure as an organic whole, No. two threaded rods pass through the thread groove with the earphone and are connected, No. two threaded rods pass through roller bearing with the wedge and are connected, the equal fixed mounting in both sides of handle has the slider, and the spout has been seted up in the outside of slider.

Preferably, the pulley passes through the minor axis with the locating lever and is connected, the surface of pulley and the internal surface laminating of wedge, the elastic construction is constituteed with No. three springs to the locating lever, the one end and the locating lever of No. three springs pass through the screw connection, the locating lever passes through the draw-in groove with the protection cotton and is connected.

(III) advantageous effects

The invention provides a headset capable of adjusting the length of a headset band. The method has the following beneficial effects:

(1) this can adjust headphone of earphone area length can drive the removal of a connecting rod through the rotation of a threaded rod, and then can drive the rotation of No. two connecting rods to can drive the rotation of L type kelly, through the cooperation of L type kelly and an extension plate, can be according to the position of user's head girth adjustment extension plate, improve the device's utilization ratio.

(2) This can adjust headphone of earphone area length, the rotation that can drive helical gear through the rotation of knob, and then can drive the rotation of protruding wheel, the rotation of protruding wheel can drive the rotation of No. three connecting rods, the rotation of No. three connecting rods can drive the removal of push rod, and then can drive the removal of bracing piece, the removal that can drive the movable block through the effect of bracing piece, and then can drive the rotation of gag lever post, through the cooperation of gag lever post and rack plate, be convenient for according to the length of No. two extension plates of user's face length adjustment.

(3) This can adjust headphone of earphone area length, can be according to the cotton size of user's ear size adjustable protection, select the protection of suitable size cotton, the user can grasp the handle, and rotatory handle, the rotation of handle can drive the rotation of No. two threaded rods, effect through the screw thread, No. two threaded rods remove at rotatory in-process, and then can drive the removal of wedge, the slope and the locating lever laminating of wedge, the removal of wedge can drive the rotation of pulley, and then can drive the rotation of locating lever, the rotation of locating lever can drive No. three springs and be compressed, locating lever card goes into the inside of protection cotton, can carry on spacingly to the protection cotton, be convenient for the installation and the dismantlement of protection cotton, the device's of being convenient for use.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic overall side view of the present invention;

FIG. 3 is a schematic view of a partial cross-sectional structure of the head beam plate of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;

FIG. 5 is a schematic view of a positioning block in partial cross-section according to the present invention;

FIG. 6 is an enlarged view of the structure at B in FIG. 5 according to the present invention;

FIG. 7 is an enlarged view of the structure of FIG. 5 at C according to the present invention;

FIG. 8 is a schematic view of the connecting structure of the receiver and the protective cotton according to the present invention;

FIG. 9 is an enlarged view of the structure shown in FIG. 8 at D according to the present invention.

In the figure: 1. a head beam plate; 2. an extension plate I; 3. a second extension plate; 4. positioning blocks; 5. a handset; 6. protecting cotton; 7. a clamping block mechanism; 701. a first threaded rod; 702. a handle; 703. moving the plate; 704. a first connecting rod; 705. a second connecting rod; 706. an L-shaped clamping rod; 707. a fixed block; 8. a limiting mechanism; 801. a knob; 802. a first bevel gear; 803. a second bevel gear; 804. a convex wheel; 805. a third connecting rod; 806. a push rod; 807. a first spring; 808. a support bar; 809. a moving block; 810. a telescopic column; 811. a second spring; 812. a limiting rod; 9. a positioning mechanism; 901. a second threaded rod; 902. a handle; 903. a wedge block; 904. a pulley; 905. positioning a rod; 906. a third spring; 10. a rack plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 9, the present invention provides a technical solution: a headset capable of adjusting the length of a headset strap comprises a head beam plate 1, a first extension plate 2, a second extension plate 3, a positioning block 4, a headphone 5, protective cotton 6, a fixture block mechanism 7, a first threaded rod 701, a handle 702, a movable plate 703, a first connecting rod 704, a second connecting rod 705, an L-shaped fixture rod 706, a fixing block 707, a limiting mechanism 8, a knob 801, a first helical gear 802, a second helical gear 803, a convex wheel 804, a third connecting rod 805, a push rod 806, a first spring 807, a support rod 808, a movable block 809, a telescopic column 810, a second spring 811, a limiting rod 812, a positioning mechanism 9, a second threaded rod 901, a handle 902, a wedge 903, a pulley 904, a positioning rod 905, a third spring 906 and a rack plate 10, wherein the head beam plate 1 is provided with two head beam plates 1, the first extension plate 2 is connected to the two head beam plates 1 in a sliding manner, and the length of the first extension plate 2 can be adjusted according to the circumference of the head of a user, the bottom end of the head beam plate 1 is fixedly provided with a second extension plate 3, the length of the second extension plate 3 can be adjusted according to the length of the face of a user, the outer side of the second extension plate 3 is sleeved with a positioning block 4, the bottom end of the positioning block 4 is fixedly provided with a receiver 5, the head beam plate 1 is connected with the head beam plate 1 through a clamping block mechanism 7, the second extension plate 3 is connected with the positioning block 4 through a limiting mechanism 8, a protective cotton 6 is connected with the receiver 5 through a positioning mechanism 9, and the outer surface of the second extension plate 3 is provided with a rack plate 10;

the fixture block mechanism 7 comprises a first threaded rod 701, a handle 702 is fixedly installed at the top end of the first threaded rod 701, a moving plate 703 is installed on the outer side of the first threaded rod 701, a first connecting rod 704 is fixedly installed on two sides of the lower end face of the moving plate 703, a second connecting rod 705 is movably connected to the bottom end of the first connecting rod 704, an L-shaped fixture rod 706 is movably connected to the bottom end of the second connecting rod 705, fixing blocks 707 located inside the head beam plate 1 are installed inside the two L-shaped fixture rods 706, and the head beam plate 1 is conveniently and fixedly connected with the first extension plate 2 under the action of the L-shaped fixture rods 706;

the first threaded rod 701 and the handle 702 are of an integrated structure, the first threaded rod 701 is connected with the first beam plate 1 through a roller bearing, the first threaded rod 701 is connected with the moving plate 703 through a threaded groove, the moving plate 703 is connected with the first connecting rod 704 through a screw, the first connecting rod 704 is connected with the first beam plate 1 through a cylindrical groove, and the rotation of the first threaded rod 701 can drive the moving plate 703 to move and further drive the first connecting rod 704 to move under the action of threads;

the first connecting rod 704 is connected with the second connecting rod 705 through a short shaft, the second connecting rod 705 is connected with the L-shaped clamping rod 706 through a short shaft, the L-shaped clamping rod 706 is connected with the fixed block 707 through a short shaft, the fixed block 707 is connected with the interior of the head beam plate 1 through a screw, the second connecting rod 705 can be driven to rotate through the movement of the first connecting rod 704, and then the L-shaped clamping rod 706 can be driven to rotate;

the limiting mechanism 8 comprises a knob 801, a first helical gear 802 is fixedly installed at one end of the knob 801, a second helical gear 803 is installed at the front end of the first helical gear 802, a convex wheel 804 is movably connected to the front end face of the second helical gear 803, a third connecting rod 805 is hinged to one end of the convex wheel 804, a push rod 806 is hinged to the top end of the third connecting rod 805, a first spring 807 is fixedly installed at the top end of the push rod 806, a supporting rod 808 is fixedly installed on the outer side of the push rod 806, a moving block 809 is installed above the supporting rod 808, a telescopic column 810 is fixedly installed at the top end of the moving block 809, a second spring 811 is fixedly installed on the outer side of the telescopic column 810, a limiting rod 812 is movably connected to the front end face of the moving block 809, and the length of the second extension plate 3 can be conveniently adjusted through the matching of the limiting rod 812 and the rack plate 10;

the knob 801 is connected with the positioning block 4 through a roller bearing, the knob 801 and the first bevel gear 802 are of an integrated structure, the first bevel gear 802 is meshed with the second bevel gear 803, and the second bevel gear 803 is connected with the convex wheel 804 through a screw. The convex wheel 804 is connected with the third connecting rod 805 through a short shaft, the third connecting rod 805 is connected with the push rod 806 through a short shaft, the push rod 806 and the positioning block 4 form a sliding structure, the first helical gear 802 can be driven to rotate through the rotation of the knob 801, the second helical gear 803 can be driven to rotate, and therefore the convex wheel 804 can be driven to rotate;

the first spring 807 and the push rod 806 form an elastic structure, the top end of the first spring 807 is connected with the inner wall of the positioning block 4 through a screw, the bottom end of the first spring 807 is connected with the push rod 806 through a screw, the push rod 806 and the support rod 808 are of an integrated structure, the moving block 809 and the positioning block 4 form a sliding structure, the moving block 809 and the positioning block 4 are connected through a slide way, one end of the telescopic column 810 is connected with the moving block 809 through a screw, the other end of the telescopic column 810 is connected with the inner wall of the positioning block 4 through a screw, one end of the second spring 811 is connected with the moving block 809 through a screw, the other end of the second spring 811 is connected with the positioning block 4 through a screw, the limit rod 812 is connected with the moving block 809 through a short shaft, the limit rod 812 is connected with the positioning block 4 through a short shaft, and the support rod 808 can be driven to move through the movement of the push rod 806, the moving block 809 can be driven to move, and the moving block 809 can drive the limiting rod 812 to rotate;

the positioning mechanism 9 comprises a second threaded rod 901, a handle 902 is fixedly mounted at the top end of the second threaded rod 901, a wedge 903 is mounted at the bottom end of the second threaded rod 901, two pulleys 904 are mounted inside the wedge 903, a positioning rod 905 is movably connected to the lower end face of each pulley 904, a third spring 906 is fixedly mounted inside each two positioning rods 905, and the rotation of the positioning rods 905 can be limited through the action of the wedge 903;

the second threaded rod 901 and the handle 902 are of an integrated structure, the second threaded rod 901 is connected with the receiver 5 through a threaded groove, the second threaded rod 901 is connected with the wedge 903 through a roller bearing, sliding blocks are fixedly mounted on two sides of the handle 902, sliding grooves are formed in the outer sides of the sliding blocks, the rotation of the handle 902 can drive the second threaded rod 901 to rotate under the action of threads, and the second threaded rod 901 moves to one side in the rotating process and further can drive the wedge 903 to move;

the pulley 904 is connected with the positioning rod 905 through a short shaft, the outer surface of the pulley 904 is attached to the inner surface of the wedge-shaped block 903, the positioning rod 905 and the third spring 906 form an elastic structure, and one end of the third spring 906 is connected with the positioning rod 905 through a screw. The locating lever 905 passes through the draw-in groove with the protection cotton 6 and is connected, can play limiting displacement to the protection cotton 6 through the effect of locating lever 905, and the stability that the device is connected has effectively been improved in the change of the protection cotton 6 of being convenient for.

When the device is used, a user can adjust the length of the first extension plate 2 according to the head and tail size of the user, the user can select the first extension plate 2 in a proper position, then the user can hold the handle 702 and rotate the handle 702, the rotation of the handle 702 can drive the first threaded rod 701 to rotate, the rotation of the first threaded rod 701 can drive the moving plate 703 to move under the action of the threads, the moving plate 703 can drive the first connecting rod 704 to move so as to drive the second connecting rod 705 to rotate, the rotation of the second connecting rod 705 can drive the L-shaped clamping rod 706 to rotate, the first extension plate 2 can be limited under the action of the L-shaped clamping rod 706 and the first extension plate 2, the circumferences of the head beam plate 1 and the first extension plate 2 can be adjusted according to needs, and the device is convenient to use;

then, a user can grasp the knob 801, and rotate the knob 801, the rotation of the knob 801 can drive the rotation of the first bevel gear 802, as the first bevel gear 802 is meshed with the second bevel gear 803, the rotation of the first bevel gear 802 can drive the rotation of the second bevel gear 803, the rotation of the second bevel gear 803 can drive the rotation of the convex wheel 804, the rotation of the convex wheel 804 can drive the rotation of the third connecting rod 805, the rotation of the third connecting rod 805 can drive the movement of the push rod 806, the push rod 806 and the positioning block 4 form a sliding structure, when the push rod 806 moves downwards, the first spring 807 is stretched, the supporting rod 808 moves downwards, when the moving block 809 is disconnected with the supporting rod 808, the telescopic column 810 extends, the initial state of the second spring 811 is a compressed state, when the second spring 811 rebounds, the moving block can be driven downwards, at this time, the limiting rod 812 rotates, and when the limiting rod 812 is connected with the port of the rack plate 10, the user can adjust the length of the second extension plate 3 according to the face of the user, select the rack plate 10 at a proper position, then the user can grasp the knob 801, and reversely rotate the knob 801, the rotation of the knob 801 can drive the rotation of the first bevel gear 802, the rotation of the first bevel gear 802 can drive the reverse rotation of the second bevel gear 803, the rotation of the second bevel gear 803 can drive the rotation of the convex wheel 804, the rotation of the convex wheel 804 can drive the rotation of the third connecting rod 805, the rotation of the third connecting rod 805 can drive the movement of the push rod 806, when the push rod 806 moves upwards, the first spring 807 is compressed, the support rod 808 moves upwards, when the moving block 809 contacts with the support rod 808, the support rod 808 can push the moving block 809 to move upwards, at the moment, the second spring 811 is compressed, the telescopic column 810 contracts, at the moment, the reverse rotation of the limit rod 812 can play a limiting role on the rack plate 10, and is convenient for adjusting the length of the second extension plate 3 according to needs, the utilization rate of the device is improved;

then, the protection cotton 6 with a proper size can be selected according to the size of the ear of the user, the user can grasp the second threaded rod 901 and rotate the second threaded rod 901, the second threaded rod 901 moves downwards in the rotation process under the action of the threads, the downward movement of the second threaded rod 901 can drive the wedge-shaped block 903 to move downwards, the positioning rod 905 can rotate through the contact between the slope surface of the wedge-shaped block 903 and the pulley 904, at the moment, the third spring 906 is compressed, the positioning rod 905 is rotationally clamped into the protection cotton 6, the protection cotton 6 can be limited, the size of the protection cotton 6 can be adjusted according to needs, and the connection stability of the device is improved.

In conclusion, the headset with the adjustable headset strap length can drive the first connecting rod 704 to move through the rotation of the first threaded rod 701 in the using process, and further drive the second connecting rod 705 to rotate, so as to drive the L-shaped clamping rod 706 to rotate, the position of the first extending plate 2 can be adjusted according to the head circumference of a user through the matching of the L-shaped clamping rod 706 and the first extending plate 2, the utilization rate of the device is improved, meanwhile, the first helical gear 802 can be driven to rotate through the rotation of the knob 801, and further the convex wheel 804 can be driven to rotate, the third connecting rod 805 can be driven to rotate through the rotation of the convex wheel 804, the push rod 806 can be driven to move through the rotation of the third connecting rod 805, and further the support rod 808 can be driven to move, the moving block 809 can be driven to move through the action of the support rod 808, and further the limiting rod 812 can be driven to rotate, and through the matching of the limiting rod 812 and the rack plate 10, length convenient to extension plate 3 according to user's face length adjustment No. two, and according to the size of user's the adjustable protection cotton 6 of ear size, select the protection cotton 6 of suitable size, the user can grasp handle 902, and rotatory handle 902, handle 902's rotation can drive the rotation of No. two threaded rods 901, effect through the screw thread, No. two threaded rods 901 remove at rotatory in-process, and then can drive wedge 903's removal, wedge 903's slope and the laminating of locating lever 905, wedge 903's removal can drive pulley 904's rotation, and then can drive the rotation of locating lever 905, the rotation of locating lever 905 can drive No. three spring 906 compressed, locating lever 905 card goes into the inside of protection cotton 6, can carry on spacingly to protection cotton 6, be convenient for protection cotton 6's installation and dismantlement, be convenient for the device's use.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A headset with adjustable headset band length, comprising a bridge plate (1), characterized in that: first roof beam slab (1) has two, two the inside sliding connection of first roof beam slab (1) has extension board (2) No. one, the bottom fixed mounting of first roof beam slab (1) has extension board (3) No. two, locating piece (4) have been cup jointed in the outside of extension board (3) No. two, the bottom fixed mounting of locating piece (4) has earphone (5), first roof beam slab (1) is connected through fixture block mechanism (7) with first roof beam slab (1), No. two extension boards (3) are connected through stop gear (8) with locating piece (4), protection cotton (6) are connected through positioning mechanism (9) with earphone (5), the surface of extension board (3) No. two is equipped with rack plate (10).

2. A headset with adjustable headband length according to claim 1, wherein: fixture block mechanism (7) includes threaded rod (701) No. one, the top fixed mounting of threaded rod (701) has handle (702), movable plate (703) is installed in the outside of threaded rod (701), the equal fixed mounting in both sides of terminal surface has connecting rod (704) No. one under movable plate (703), the bottom swing joint of connecting rod (704) has connecting rod (705) No. two, the bottom swing joint of connecting rod (705) No. two has L type kelly (706), two the internally mounted of L type kelly (706) has fixed block (707) that is located head beam board (1) inside.

3. A headset with adjustable headband length according to claim 2, wherein: threaded rod (701) and handle (702) be the integral structure, threaded rod (701) is connected through roller bearing with first roof beam board (1), threaded rod (701) is connected through the thread groove with movable plate (703), movable plate (703) passes through the screw connection with connecting rod (704), connecting rod (704) passes through the columnar order groove with first roof beam board (1) and is connected.

4. A headset with adjustable headband length according to claim 2, wherein: the first connecting rod (704) is connected with the second connecting rod (705) through a short shaft, the second connecting rod (705) is connected with the L-shaped clamping rod (706) through a short shaft, the L-shaped clamping rod (706) is connected with the fixed block (707) through a short shaft, and the fixed block (707) is connected with the inside of the head beam plate (1) through a screw.

5. A headset with adjustable headband length according to claim 1, wherein: the limiting mechanism (8) comprises a knob (801), one end of the knob (801) is fixedly provided with a first bevel gear (802), a second bevel gear (803) is arranged at the front end of the first bevel gear (802), a convex wheel (804) is movably connected with the front end surface of the second bevel gear (803), one end of the convex wheel (804) is hinged with a third connecting rod (805), the top end of the third connecting rod (805) is hinged with a push rod (806), a first spring (807) is fixedly arranged at the top end of the push rod (806), a support rod (808) is fixedly arranged at the outer side of the push rod (806), a moving block (809) is arranged above the supporting rod (808), a telescopic column (810) is fixedly arranged at the top end of the moving block (809), a second spring (811) is fixedly mounted on the outer side of the telescopic column (810), and a limiting rod (812) is movably connected to the front end face of the moving block (809).

6. A headset with adjustable headband length according to claim 5, wherein: the knob (801) is connected with the positioning block (4) through a roller bearing, the knob (801) and the first bevel gear (802) are of an integrated structure, the first bevel gear (802) is meshed with the second bevel gear (803), and the second bevel gear (803) is connected with the convex wheel (804) through a screw. The convex wheel (804) is connected with the third connecting rod (805) through a short shaft, the third connecting rod (805) is connected with the push rod (806) through the short shaft, and the push rod (806) and the positioning block (4) form a sliding structure.

7. A headset with adjustable headband length according to claim 5, wherein: the spring (807) and the push rod (806) form an elastic structure, the top end of the spring (807) is connected with the inner wall of the positioning block (4) through a screw, the bottom end of the spring (807) is connected with the push rod (806) through a screw, the push rod (806) and the support rod (808) are of an integrated structure, the moving block (809) and the positioning block (4) form a sliding structure, the moving block (809) is connected with the positioning block (4) through a slide way, one end of the telescopic column (810) is connected with the moving block (809) through a screw, the other end of the telescopic column (810) is connected with the inner wall of the positioning block (4) through a screw, one end of the second spring (811) is connected with the moving block (809) through a screw, the other end of the second spring (811) is connected with the positioning block (4) through a screw, and the limit rod (812) is connected with the moving block (809) through a short shaft, the limiting rod (812) is connected with the positioning block (4) through a short shaft.

8. A headset with adjustable headband length according to claim 1, wherein: the positioning mechanism (9) comprises a second threaded rod (901), a handle (902) is fixedly mounted at the top end of the second threaded rod (901), a wedge block (903) is mounted at the bottom end of the second threaded rod (901), two pulleys (904) are mounted inside the wedge block (903), positioning rods (905) are movably connected to the lower end face of each pulley (904), and three springs (906) are fixedly mounted inside each positioning rod (905).

9. A headset with adjustable headband length according to claim 8, wherein: the novel earphone is characterized in that the second threaded rod (901) and the handle (902) are of an integrated structure, the second threaded rod (901) is connected with an earphone (5) through a threaded groove, the second threaded rod (901) is connected with the wedge-shaped block (903) through a roller bearing, sliding blocks are fixedly mounted on two sides of the handle (902), and sliding grooves are formed in the outer sides of the sliding blocks.

10. A headset with adjustable headband length according to claim 8, wherein: pulley (904) are connected through the minor axis with locating lever (905), the surface of pulley (904) and the interior surface laminating of wedge block (903), elastic construction is constituteed with No. three spring (906) to locating lever (905), the one end and the locating lever (905) of No. three spring (906) pass through the screw connection. The positioning rod (905) is connected with the protective cotton (6) through a clamping groove.