CN218978212U - Watchband - Google Patents

Abstract

One embodiment of the present utility model provides a wristband comprising: the first connecting belt is provided with a first fixed end and a first adjusting end which are opposite; the first clamping piece is connected with the first adjusting end; the first clamping piece is provided with a first magnetic element; the second connecting belt is provided with a second fixed end and a second adjusting end which are opposite; the second clamping piece is arranged between the second fixed end and the second adjusting end, and a second magnetic element is arranged on the second clamping piece; the first clamping piece and the second clamping piece can be mutually clamped, and are magnetically connected through the first magnetic element and the second magnetic element, so that the first connecting belt and the second connecting belt are mutually limited and buckled. The watchband disclosed by the embodiment of the utility model has the characteristics of convenience and stability in wearing.

Description

Watchband

Technical Field

The utility model relates to the technical field of electronic products, in particular to a watchband.

Background

The intelligent bracelet, the watch and the like can be worn on the wrist, and have the functions of displaying time of the traditional watch and other additional functions of health monitoring, card swiping and the like. The electronic product worn on the wrist can be collectively called a watch together with a traditional watch, the watch realizes display, monitoring and operation functions through a dial, and watchbands fixed at two ends of the dial are used for wearing the dial on the wrist. The traditional watch generally adopts a folding buckle, a needle buckle and other watch buckles, when the watch is worn by taking the needle buckle as an example, one side watchband is required to pass through the needle buckle of the other side watchband, and a thimble on the needle buckle passes through a positioning hole on the watch band to realize fixation, so that most of the traditional intelligent watches and the like adopt the structure. However, this type of wearing is often cumbersome to operate and is very inconvenient to wear and release by one hand.

Accordingly, it is desirable to provide a new wristband that solves the problem of difficulty in wearing existing wristband.

Disclosure of Invention

Therefore, in order to overcome at least part of the defects and shortcomings in the prior art, the embodiment of the utility model provides the watchband which has the characteristics of convenience and stability in wearing.

Specifically, one embodiment of the present utility model provides a wristband comprising: the first connecting belt is provided with a first fixed end and a first adjusting end which are opposite; the first clamping piece is connected with the first adjusting end; the first clamping piece is provided with a first magnetic element; the second connecting belt is provided with a second fixed end and a second adjusting end which are opposite; the second clamping piece is arranged between the second fixed end and the second adjusting end, and a second magnetic element is arranged on the second clamping piece; the first clamping piece and the second clamping piece can be mutually clamped, and are magnetically connected through the first magnetic element and the second magnetic element, so that the first connecting belt and the second connecting belt are mutually limited and buckled.

In one embodiment, the first fastener comprises a first fastener seat and an opening device, the first fastener seat being fixed on the first connection strap; the opening device is movably connected with the first clamping seat and can move close to or far away from the second clamping piece so as to be mutually clamped or separated from the second clamping piece; the first magnetic element is arranged on the first clamping seat.

In one embodiment, one end of the opening device is rotatably connected with the first buckle seat, and the opposite end is provided with a first buckle position; the second buckling piece is provided with a second buckling position, and the first buckling position can rotate around the first buckling seat to be mutually buckled with the second buckling position.

In one embodiment, a first mounting groove is formed in one side, close to the opening device, of the first buckle seat, and the first magnetic element is arranged in the first mounting groove; the opening means is a magnetic material.

In one embodiment, the opening device is disposed on a side of the first latch facing away from the first connection strap; the first buckling seat is provided with a through hole, the first buckling position extends from one end of the opening device towards the direction close to the first buckling seat, and the second buckling position is a clamping groove matched with the first buckling position; the first buckling position can pass through the through hole along with the rotation of the opening device and is clamped with the second buckling position.

In one embodiment, the first fastening seat comprises a first bottom plate and two first side plates arranged on two opposite sides of the first bottom plate, and the two first side plates and the first bottom plate enclose to form a containing groove which is penetrated along the direction from the first fixed end to the first adjusting end; the second buckling piece can be buckled with the first buckling piece and limited in the accommodating groove.

In one embodiment, a third buckling position is respectively arranged on one side of the two first side plates adjacent to the accommodating groove; a fourth buckling position is arranged on one side, close to the first buckling seat, of the second buckling piece; the third buckling position and the fourth buckling position can be mutually buckled so as to enable the first connecting belt and the second connecting belt to be buckled.

In one embodiment, a second mounting groove matched with the opening device in shape is formed in one side, away from the accommodating groove, of the first buckle seat; the opening device can be embedded in the second mounting groove; the opening device comprises a second bottom plate and two second side plates, wherein the two second side plates extend from two sides of the second bottom plate towards the direction approaching the first buckling seat respectively; finger position protrusions are respectively arranged on the two second side plates.

In one embodiment, the second fastener comprises a second fastener seat and a positioning fastener, and the second connecting belt is slidably connected with the second fastener seat and penetrates between the second fastener seat and the positioning fastener; the positioning buckle and the second connecting belt can be selectively clamped.

In one embodiment, one end of the positioning buckle is rotatably connected with the second buckle seat, the positioning buckle is provided with an adjusting buckle protruding towards the direction close to the second buckle seat, and a plurality of buckle holes are formed in the second connecting band at intervals along the direction from the second adjusting end to the second fixed end; the adjusting buckle can be clamped with the target buckle hole in the buckle holes along with the rotation of the positioning buckle.

As can be seen from the above, the above embodiments of the present utility model can achieve one or more of the following advantages: through setting up first magnetism and inhale the component and second magnetism and inhale the component and make first connecting band and second connecting band can inhale mutually magnetically, can realize automatic counterpoint by the magnetism effect of inhaling to set up first fastener and second fastener and can mutually block in order to realize the mutual spacing lock of first connecting band and second connecting band, prevent not hard up effect, realize wearing convenient and stable effect.

Other aspects and features of the present utility model will become apparent from the following detailed description, which refers to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the utility model. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.

Drawings

The following detailed description of specific embodiments of the utility model refers to the accompanying drawings.

Fig. 1 is a schematic structural view of a watchband according to an embodiment of the present utility model.

Fig. 2 is a schematic view of the wristband shown in fig. 1 in another state.

Fig. 3 is an exploded view of a part of the structure of the wristband shown in fig. 1.

Fig. 4 is a schematic view of another view of fig. 3.

Fig. 5 is an exploded view of another part of the band shown in fig. 1.

Fig. 6 is a schematic view of another view of fig. 5.

Fig. 7 is a schematic view of the second clasp in another state of the wristband shown in fig. 1.

[ reference numerals description ]

10: a first connecting band; 11: a first fixed end; 12: a first adjustment end;

20: a first clamping piece; 21: a first magnetic element; 22: a first fastening seat; 221: a first mounting groove; 222: a through hole; 223: a first base plate; 224: a first side plate; 225: a receiving groove; 226: a third buckling position; 2261: a main body portion; 2262: a clamping hook; 227: a second mounting groove; 23: opening the device; 231: a first buckling position; 232: a second base plate; 233: a second side plate; 2331: a finger position bulge;

30: a second connecting band; 31: a second fixed end; 32: a second adjustment end; 33: a snap hole;

40: a second clamping piece; 41: a second magnetic element; 42: the second buckle seat; 421: a second buckling position; 422: a fourth buckling position; 4221: a first groove; 4222: a second groove; 43: a positioning buckle; 431: and adjusting the buckle.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings.

In order that those skilled in the art will better understand the technical solutions of the present utility model, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be further noted that the division of the embodiments in the present utility model is only for convenience of description, and should not be construed as a specific limitation, and features in the various embodiments may be combined and mutually referenced without contradiction.

As shown in fig. 1, the present embodiment provides a watch band, which can be combined with a dial to form a wristwatch, for example, the watch band includes a first connecting band 10, a second connecting band 30, and a first fastening member 20 and a second fastening member 40 for fastening the first connecting band 10 and the second connecting band 30, respectively, at opposite ends of a dial (not shown in fig. 1). Specifically, referring to fig. 1 and 2, the first connecting band 10 has opposite first fixing ends 11 and first adjusting ends 12, the first fixing ends 11 being used for connecting the aforementioned dial. The second connecting strap 30 has opposite second fixed ends 31 and second adjustment ends 32. The second fixing end 31 is used for connecting the other end of the dial plate opposite to the first connecting band 10. The first fastening member 20 is connected to the first adjustment end 12. The first fastening member 20 is provided with a first magnetic element 21. The second fastening member 40 is disposed between the second fixed end 31 and the second adjusting end 32, and the second fastening member 40 is provided with a second magnetic element 41. The first fastening piece 20 and the second fastening piece 40 can be fastened to each other, and are magnetically connected by the first magnetic element 21 and the second magnetic element 41, so that the first connecting belt 10 and the second connecting belt 30 are mutually limited and fastened.

As shown in fig. 1, which is a schematic view of the structure of the wristband not attached to the dial. If the first fixing end 11 is fixed at one end of the dial, the second fixing end 12 is fixed at the other end of the dial, and the watch can be formed. According to the orientation shown in fig. 1, the first fastening member 20 and the second fastening member 40 are fastened up and down so that the first connection strap 10 and the second connection strap 30 can be connected to each other. The first magnetic attraction element 21 and the second magnetic attraction element 41 may be magnets, for example, and their adjacent one surfaces may have opposite magnetic poles and may attract each other. Alternatively, one of the first magnetic attraction element 21 and the second magnetic attraction element 41 may be a magnet, and the other may be a material that can be attracted by a magnet, such as an iron sheet, but the attraction is stronger when both are magnets. When the first fastening member 20 and the second fastening member 40 approach each other during wearing, the first magnetic element 21 and the second magnetic element 41 are magnetically attracted to be aligned and fastened, so that wearing by one hand operation can be realized, and the first connecting band 10 and the second connecting band 30 are magnetically attracted to be not easily opened without additional external force. Therefore, the wearing is convenient and stable.

Specifically, in one embodiment, the first buckle 20 includes a first buckle seat 22 and an opening device 23. The first latch 22 is fixed to the first connection strap 10, for example, one end of the first latch 22 is fixed to an upper side of the first connection strap 10 as shown in fig. 2. The opening device 23 is movably connected to the first fastening seat 22 and can move close to or away from the second fastening piece 40 to be mutually fastened or separated from the second fastening piece 40. The first magnetic element 21 is disposed on the first fastening seat 22, for example. Therefore, the first buckling seat 22 can realize the alignment in the buckling process of the first buckling piece 20 and the second buckling piece 40, and the opening device 23 is used for limiting and clamping after the alignment is completed, so that the clamping is more accurate and stable. In one embodiment, the opening device 23 is arranged, for example, on the side of the first catch 22 facing away from the first connecting strip 10. One end of the opening device 23 is rotatably connected to the first fastening seat 22, and the opposite end is provided with a first fastening position 231. The second fastening member 40 is provided with a second fastening portion 421, and the first fastening portion 231 can rotate around the first fastening seat 22 to be fastened with the second fastening portion 421. In one embodiment, the first fastening seat 22 is provided with a through hole 222, the first fastening position 231 extends from one end of the opening device 23 towards a direction approaching the first fastening seat 22, the second fastening position 421 is a slot matching with the first fastening position 231, and the first fastening position 231 can pass through the through hole 222 and be fastened with the second fastening position 421 along with the rotation of the opening device 23. The second fastening portion 421 may be, for example, a U-shaped groove or a through groove on the first fastening seat 22 that is recessed toward a direction away from the opening device 23, and in some embodiments, may also be an L-shaped groove, which will be specifically described in the following embodiments.

Referring to fig. 2 to 4, one end of the first buckle seat 22 is fixed on the upper side of the first connection strap 10, and the opposite end extends toward the side of the first adjustment end 12 facing away from the first fixed end 11 and is rotatably connected with the opening device 23. The first fastening position 231 is disposed at the side near the first fixing end 11. The corresponding second locking portion 421 is located on the side of the second locking member 40 adjacent to the second adjusting end 32. Or vice versa, the first fastening portion 231 is disposed on the side of the first adjusting end 12 away from the first fixing end 11, and the second fastening portion 421 may be disposed on the side of the second fastening portion 40 adjacent to the second fixing end 31. When the first buckle 20 and the second buckle 40 are buckled, the first buckle 231 is inserted into the second buckle 421 to be engaged with the second buckle 421, and the first wristband 10 and the second wristband 30 are limited by the first buckle 231 and the second buckle 421 when the first wristband 10 and the second wristband 30 are pulled to the left and the right according to the orientation of fig. 2, the first wristband 10 and the second wristband 30 cannot move and can be worn stably. When it is desired to unlock the wristband, the opening device 23 is simply turned to move the first clasp 231 away from the second clasp 421, and the left-right movement of the first wristband 10 and the second wristband 30 is not restricted, so that the wristband may be unlocked. When the wearer needs to wear the device again, the first magnetic element 21 and the second magnetic element 41 are attracted to align the device 23 in the opened state of the opening device 23, and then the opening device 23 is closed, so that the first fastening position 231 and the second fastening position 421 can be fastened. The opening device 23 can be stably connected with the first fastening seat 22 by the through hole 221 on the first fastening seat 22, and cannot be easily opened. In one embodiment, a first mounting groove 221 is disposed on a side of the first fastening seat 22 near the opening device 23, and the first magnetic element 21 is disposed in the first mounting groove 221, and the opening device 23 is made of a magnetic material, such as an iron sheet, so that the opening device 23 can be further stably adsorbed on the first fastening seat 22 and cannot be easily opened.

In one embodiment, the first catch 22 comprises a first base plate 223 and two first side plates 224 arranged on opposite sides of the first base plate 223 and extending from the first base plate 223 towards a side facing away from the opening device 23. The two first side plates 224 and the first bottom plate 223 enclose to form a containing groove 225 penetrating along the direction from the first fixed end 11 to the first adjusting end 12. The second fastening component 40 can be fastened with the first fastening component 20 and limited in the accommodating groove 225. In one embodiment, for example, the second fastening portion 421 is an L-shaped slot, and the first fastening portion 231 and the second fastening portion 421 are connected in an abutting manner, and as shown in fig. 4, the two first side plates 224 are respectively provided with the third fastening portion 226 at a side adjacent to the accommodating groove 225. As shown in fig. 2 and 5, a fourth fastening portion 422 is disposed on a side of the second fastening portion 40 adjacent to the first fastening portion 22. The third fastening portion 226 and the fourth fastening portion 422 may be fastened to each other to fasten the first connecting strap 10 and the second connecting strap 30. The first and second locking portions 231 and 421 cooperate to restrict movement of the first and second connection bands 10 and 30 in one direction, and the movement of the first and second connection bands 10 and 30 in the other direction is restricted by adding the fourth and third locking portions 422 and 226 on the inner side.

Specifically, the first fastening position 231 is disposed on the opening device 23 near the first fixed end 11. The second fastening portion 421 is disposed on a side of the second fastening member 40 near the second adjusting end 32. The fourth catch 422 includes a first recess 4221 recessed toward the second catch 40 away from the first catch 20 and a second recess 4222 recessed in a direction from the second fixed end 31 to the second adjustment end 32, the first recess 4221 being in communication with the second recess 4222. The third fastening location 226 includes a main body portion 2261 matching the first recess 4221 and a hook 2262 extending from the main body portion 2261 in a direction from the first adjustment end 12 to the first fixing end 11, and the hook 2262 may slide into the second recess 4222 along the first recess 4221 to fasten the first fastening device 20 and the second fastening device 40. Referring to fig. 2 and 4, when the first fastening device 20 and the second fastening device 40 are fastened to each other, the first fastening position 231 resists the right side of the second fastening position 421 and cannot be pulled when the first connecting strap 10 is pulled leftwards and the second connecting strap 30 is pulled rightwards. When the first connecting band 10 is pulled to the right and the second connecting band 30 is pulled to the left, the hook 2262 hooks the second groove 4222, and cannot be pulled. And both side walls of the second groove 4222 may also restrict the up-down separation of the first snap member 20 and the second snap member 40. When the watchband needs to be unfastened, the opening device 23 is rotated first to contact the limit between the first buckle position 231 and the second buckle position 421, so that when the first connecting band 10 is pulled leftwards and the second connecting band 30 is pulled rightwards, the clamping hook 2262 can be withdrawn from the second groove 4222 into the first groove 4221, and the first buckle piece 20 and the second buckle piece 40 can be separated up and down along with the process. When the wearer needs to wear again, in the state that the opening device 23 is opened, the first fastening piece 20 and the second fastening piece 40 are close to each other, so that the hooks 2262 under the magnetic attraction and adsorption action of the first magnetic attraction piece 21 and the second magnetic attraction piece 41 can slide into the second grooves 4222 along the first grooves 4221, and realize the clamping connection, and finally, the opening device 23 is closed, so that the firm connection can be realized. The only part of the manual operation during the wearing and releasing process is the opening and closing device 23, which is simple to operate.

In one embodiment, the side of the first catch 22 facing away from the receiving groove 225 is provided with a second mounting groove 227 matching the shape of the opening device 23. The opening device 23 may be embedded in the second mounting groove 227. The opening device 23 includes a second bottom plate 232 and two second side plates 233 extending from both sides of the second bottom plate 232 toward a direction approaching the first latch seat 22, respectively. Finger protrusions 2331 are provided on the two second side plates 233, respectively. The finger contact can be facilitated and the opening device 23 can be opened more conveniently.

In some embodiments, referring to fig. 5 to 7, the second buckle 40 includes a second buckle seat 42 and a positioning buckle 43, and the second connecting strap 30 is slidably connected to the second buckle seat 42 and passes between the second buckle seat 42 and the positioning buckle 43. The positioning buckle 43 and the second connecting belt 30 can be selectively clamped, the positioning buckle 43 has two states of being clamped with the second connecting belt 30 and being separated from the second connecting belt 30, when the position of the second clamping buckle 40 on the second connecting belt 30 needs to be moved, the positioning buckle 43 and the second connecting belt 30 are released from being clamped, and after being moved to a proper position, the positioning buckle 43 and the second connecting belt 30 are clamped with each other to fix the position of the second clamping buckle 40. Specifically, one end of the positioning buckle 43 is rotatably connected to the second buckle seat 42, and the positioning buckle 43 has an adjusting buckle 431 protruding toward a direction approaching the second buckle seat 42, and the second connecting strap 30 is provided with a plurality of buckle holes 33 disposed at intervals along a direction from the second adjusting end 32 to the second fixing end 31. The adjusting buckle 431 can be clamped with the target buckle hole in the plurality of buckle holes 33 along with the rotation of the positioning buckle 43. As shown in fig. 7, when the positioning buckle 43 is rotated to be perpendicular to the second connecting strap 30, the adjusting buckle 431 is rotated out of the original buckle hole 33, and the second buckle 40 can slide left and right at this time, so as to adjust different positions of the second buckle 40 on the second connecting strap 30, and after the second buckle 40 is adjusted to a proper position, the positioning buckle 43 is rotated to be parallel to the second connecting strap 30, and at this time, the adjusting buckle 431 is clamped into the target buckle hole 33. Such that the second bayonet 40 is not movable. Therefore, the wrist strap can be used for wrists with different thicknesses, and is more flexible and convenient. In addition, in the present embodiment, the second magnetic element 41 may be disposed on a side of the second fastening seat 42 facing the positioning buckle 43. The second fastening portion 421 and the fourth fastening portion 422 may be disposed on a side of the second fastening seat 42 facing away from the positioning buckle 43.

The present utility model is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (10)

1. A wristband, comprising:

a first connecting band (10) having opposite first fixed ends (11) and first adjustment ends (12);

a first snap member (20) connected to the first adjustment end (12); the first clamping piece (20) is provided with a first magnetic element (21);

a second connecting band (30) having opposite second fixed ends (31) and second adjustment ends (32);

the second clamping piece (40) is arranged between the second fixed end (31) and the second adjusting end (32), and a second magnetic element (41) is arranged on the second clamping piece (40);

the first clamping piece (20) and the second clamping piece (40) can be mutually clamped, and are magnetically connected through the first magnetic element (21) and the second magnetic element (41), so that the first connecting belt (10) and the second connecting belt (30) are mutually limited and buckled.

2. The wristband according to claim 1, wherein said first clasp (20) comprises a first clasp seat (22) and opening means (23), said first clasp seat (22) being fixed on said first connecting band (10); the opening device (23) is movably connected to the first buckling seat (22) and can move close to or far away from the second buckling piece (40) so as to be mutually buckled or separated with the second buckling piece (40); the first magnetic element (21) is arranged on the first clamping seat (22).

3. The wristband according to claim 2, characterized in that one end of said opening means (23) is rotatably connected to said first clasp seat (22), the opposite end being provided with a first clasp position (231); the second buckling piece (40) is provided with a second buckling position (421), and the first buckling position (231) can rotate around the first buckling seat (22) to be mutually buckled with the second buckling position (421).

4. A wristband according to claim 3, wherein the first clasp seat (22) is provided with a first mounting groove (221) on the side close to the opening device (23), the first magnetic element (21) being arranged in the first mounting groove (221); the opening device (23) is a magnetic material.

5. -watchband according to claim 3, characterised in that the opening means (23) are arranged on the side of the first clasp seat (22) facing away from the first connecting band (10); the first buckling seat (22) is provided with a through hole (222), the first buckling position (231) extends from one end of the opening device (23) towards the direction close to the first buckling seat (22), and the second buckling position (421) is a clamping groove matched with the first buckling position (231); the first buckling position (231) can pass through the through hole (222) along with the rotation of the opening device (23) and is clamped with the second buckling position (421).

6. The watchband according to claim 2, characterized in that the first fastening seat (22) comprises a first bottom plate (223) and two first side plates (224) arranged on two opposite sides of the first bottom plate (223), wherein the two first side plates (224) and the first bottom plate (223) are enclosed to form a containing groove (225) penetrating along the direction from the first fixed end (11) to the first adjusting end (12); the second clamping piece (40) can be buckled with the first clamping piece (20) and is limited in the accommodating groove (225).

7. The wristband according to claim 6, wherein the two first side plates (224) are each provided with a third clasp (226) adjacent to a side of the housing slot (225); a fourth buckling position (422) is arranged on one side, close to the first buckling seat (22), of the second buckling piece (40); the third buckling position (226) and the fourth buckling position (422) can be mutually buckled so as to enable the first connecting belt (10) and the second connecting belt (30) to be buckled.

8. The wristband according to claim 6, characterized in that the side of the first clasp seat (22) facing away from the housing slot (225) is provided with a second mounting slot (227) matching the shape of the opening device (23); the opening device (23) can be embedded in the second mounting groove (227); the opening device (23) comprises a second bottom plate (232) and two second side plates (233) which extend from two sides of the second bottom plate (232) towards the direction approaching the first buckling seat (22); finger position protrusions (2331) are respectively arranged on the two second side plates (233).

9. The watchband according to claim 1, characterized in that the second clasp (40) comprises a second clasp seat (42) and a positioning clasp (43), the second connecting band (30) being slidably connected to the second clasp seat (42) and passing between the second clasp seat (42) and the positioning clasp (43); the positioning buckle (43) and the second connecting belt (30) can be selectively clamped.

10. The watchband according to claim 9, characterized in that one end of the positioning buckle (43) is rotatably connected with the second buckle seat (42), and the positioning buckle (43) is provided with an adjusting buckle (431) protruding towards the direction approaching the second buckle seat (42), and a plurality of buckle holes (33) are arranged on the second connecting band (30) at intervals along the direction from the second adjusting end (32) to the second fixed end (31); the adjusting buckle (431) can be clamped with the target buckle hole (33) in the buckle holes (33) along with the rotation of the positioning buckle (43).

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