Wrist-worn scanning equipment

Abstract

The utility model discloses wrist-worn scanning equipment, which comprises a scanning main body, a tightness adjusting module, a first wrist strap and a second wrist strap, the scanning main body comprises a shell, and first connecting parts are formed on the two sides of the shell respectively; the scanning body is located on the inner side or the outer side of the wrist when worn. The tightness adjusting module comprises an adjusting rail and an adjusting block; the adjusting rail comprises two sliding rails which are parallel to each other, and the sliding rails are grooves with opposite openings; the sliding rail comprises a groove bottom, and a plurality of first clamping parts are formed on the groove bottom; sliding strips matched with the sliding rails in a sliding installation mode are formed on the two sides of the adjusting block respectively and installed in the sliding rails respectively. A second clamping piece is arranged at one end of each sliding strip in the direction facing the groove bottom and can be clamped with or separated from the first clamping part, so that the adjusting rail and the adjusting block are relatively fixed and can relatively slide; the first wrist strap and the second wrist strap are of elastic flat strap-shaped structures, one ends of the first wrist strap and the second wrist strap are connected with the two first connecting parts respectively, and the other ends are connected with the adjusting rail and the second clamping piece respectively. The stability and the comfort are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of identification code recognition equipment, specifically relating to a wrist-worn scanning device. Background Technology

[0002] With the widespread adoption of smart devices and the rapid development of IoT technology, QR codes and barcodes, as efficient information carriers, have been widely used in various fields such as retail, logistics, warehousing, and healthcare. Traditional handheld barcode scanners require one hand, which is increasingly inconvenient when performing other tasks or in mobile scenarios. Therefore, wrist-worn scanning devices have begun to appear on the market, aiming to meet users' diverse needs by freeing up their hands and improving scanning efficiency.

[0003] Currently, existing wrist-worn scanning devices are fixed to the user's wrist with straps or watchbands, which cannot balance the contradiction between comfort and stability. Moreover, once it is bound to the wrist of one arm, it is difficult to adjust the tightness in real time with the other hand, and the user experience needs to be further improved.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] This invention addresses the problem in existing wrist-worn scanning devices that cannot be adjusted with one hand while worn, affecting wearing comfort and stability. It proposes a wrist-worn scanning device that achieves real-time adjustment with one hand while wearing through a real-time adjustment structure, thereby improving the comfort and stability of the wrist-worn scanning device.

[0006] To achieve the above-mentioned utility model / design objectives, the present utility model adopts the following technical solution:

[0007] A wrist-worn scanning device includes a scanning body, a tightness adjustment module, a first wristband, and a second wristband;

[0008] The scanning body includes a regularly shaped and flat shell and an identification code scanning module fixed inside the shell; the shell has a first connecting part formed on its parallel and opposite sides; the scanning body is worn on the inside or outside of the wrist;

[0009] The tension adjustment module includes an adjustment rail and an adjustment block. The adjustment rail includes two parallel slide rails, which are grooves with openings facing each other and at least one end connected. The slide rail includes a groove bottom and a plurality of evenly arranged first engaging portions are formed along its length. The parallel and opposite sides of the adjustment block are respectively formed with slide bars adapted to the slide rail for sliding installation, and are respectively installed in each of the slide rails. A second engaging member is respectively provided at one end of each slide bar facing the groove bottom, which can engage and disengage with the first engaging portion, and when engaged, the adjustment rail and the adjustment block are relatively fixed; when disengaged, the adjustment rail and the adjustment block can slide relative to each other.

[0010] The first wristband is an elastic flat strip structure, with one end connected to one of the first connecting parts along its length and the other end connected to one end of the adjustment rail;

[0011] The second wristband is an elastic, flat, strip-shaped structure. One end of its length is connected to another of the first connecting parts, and the other end is connected to the end of the adjusting block that is away from the second snap-fit ​​member.

[0012] In some specific embodiments, a through hole is formed on the slide bar facing the bottom of the groove;

[0013] The second snap-fit ​​component is fitted to the through hole and is installed in the through hole via an elastic element; when the elastic element is in the reset state, one end of the second snap-fit ​​component extends out of the slide bar; when the elastic element is in the stretched deformation state, one end of the second snap-fit ​​component retracts into the through hole.

[0014] The first locking part is a groove; when one end of the second locking member extends out of the slide bar, it is locked in the first locking part; when one end of the second locking member retracts into the through hole, it disengages from the first locking part.

[0015] In some specific embodiments, the slide rail is a U-shaped groove;

[0016] One end of the second snap-fit ​​member has a connected second snap-fit ​​portion and a guide portion, which are respectively a vertical plane and an inclined plane facing the bottom of the groove; the guide portion forms an acute angle with the length direction of the slide bar away from the second snap-fit ​​member;

[0017] The two side walls of the first snap-fit ​​portion are respectively fitted and adapted to the second snap-fit ​​portion and the guide portion.

[0018] In some specific embodiments, a reset member is also included, which is fixedly connected to the other end of the second snap-fit ​​member and is located outside the tightness adjustment module when worn, for stretching the elastic element.

[0019] In some specific embodiments, the adjusting block is a square block; the slider is a low step located on both sides of the adjusting block along its length.

[0020] A mounting portion, which is a groove, is formed in the middle of the adjusting member; the through hole communicates with the mounting portion; the reset member passes through the mounting portion and is fixedly connected to the other end of the second snap-fit ​​member.

[0021] In some specific embodiments, a first handle is formed at one end of the adjustment rail, which is a protrusion located outside the plane formed by the two slide rails and connecting the two slide rails;

[0022] A second handle is formed at one end of the adjusting block near the second latching member, which is a protrusion located on the outside of the plane formed by the two slide bars.

[0023] In some specific embodiments, the slide rail component further includes a second connecting part, which is a flat plate structure with the same length as the slide rail, and its two sides in the width direction are respectively fixedly connected to one side wall of the two slide rails; when worn, it is connected to the wrist.

[0024] In some specific embodiments, the two slide rails and the second connecting part are integral parts; the tension adjustment module also includes a stabilizing member, which is a flat structure adapted to the outer side of the second connecting part and fixedly connected to the second connecting part; the stabilizing member is made of latex material.

[0025] In some specific embodiments, two detachable modules are also included, which include a first detachable mounting component and a second detachable mounting component that are detachably connected.

[0026] Two of the first disassembly and mounting components are fixedly connected to two of the first connecting portions respectively; one of the second disassembly and mounting components is fixedly connected to the other end of the first wristband, and the other of the second disassembly and mounting components is fixedly connected to the other end of the second wristband.

[0027] In some specific embodiments, the first disassembly and installation component is a cylindrical structure with a connecting groove formed along its side that is connected in both the length direction and the inner and outer directions; a third snap-fit ​​part is formed in the middle of the connecting groove, which is a U-shaped groove with the opening located on one side of the connecting groove.

[0028] The second disassembly and installation component includes a fitting part that is adapted to the first disassembly and installation component and a fourth snap-fit ​​part, one end of which is fixedly connected to the middle of the fitting part and the other end of which is fixedly connected to the other end of the first wristband or the second wristband. The thickness of the fourth snap-fit ​​part is adapted to the sliding installation of the connecting groove and the width is adapted to the installation of the third snap-fit ​​part. The fitting part is driven by the connecting groove to be installed in the first disassembly and installation component and snapped into the third snap-fit ​​part.

[0029] Compared with the prior art, the advantages and positive effects of this utility model are:

[0030] This invention relates to a wrist-worn scanning device. Before being worn on the wrist, the length of the strap can be selected or adjusted. Once on the wrist, a closed loop is formed by the connection of the adjustment rails of the tension adjustment module. The size of the closed loop is adjusted by regulating the overall length of the tension adjustment module. This not only allows for single-handed wear but also ensures a secure and comfortable fit after wearing by adjusting the tension adjustment module. Furthermore, it allows for quick and easy adjustment of the tension, improving the efficiency of balanced adjustment for both stability and comfort. Additionally, the stability and secureness of the engagement adjustment between the double slide rails, double sliders, and double first locking parts and double second locking parts are enhanced.

[0031] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of an embodiment of a wrist-worn scanning device proposed in this utility model;

[0034] Figure 2 This is a schematic diagram of the structure of an embodiment of a wrist-worn scanning device proposed in this utility model, showing the separation of the main body and the wristband;

[0035] Figure 3 This is a schematic diagram of the structure of the adjustment block of the tightness adjustment module according to an embodiment;

[0036] Figure 4 This is a schematic diagram of the snap-fit ​​and reset structure in the tightness adjustment module according to the embodiment;

[0037] Figure 5 This is a schematic diagram of the adjustment rail of the tension adjustment module according to an embodiment;

[0038] Figure 6 This is a structural schematic diagram of the wristband and detachable module according to an embodiment;

[0039] Figure 7 This is a structural schematic diagram of the wristband according to an embodiment.

[0040] In the picture,

[0041] 1. Scanning body; 11. Housing; 12. First connecting part; 13. Identification code scanning module; 2. Tightness adjustment module; 21. Adjustment rail; 211. Slide rail; 212. Slot bottom; 213. First locking part; 214. Second connecting part; 215. Stabilizer; 216. First handle; 22. Adjustment block; 221. Slide bar; 222. Second locking part; 223. Mounting part; 224. Reset part; 225. Second handle; 226. Second locking part; 227. Guide part; 228. Through hole; 229. Elastic element; 220. Blind hole; 3. First wristband; 4. Second wristband; 5. Detachable module; 51. First disassembly and installation part; 511. Connecting slot; 512. Third locking part; 52. Second disassembly and installation part; 521. Set part; 522. Fourth locking part. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0046] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0047] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The present invention discloses a wrist-worn scanning device comprising a scanning body 1, which includes a regularly shaped and flat housing 11 and an identification code scanning module 13 fixed inside the housing 11; the housing 11 includes two parallel and opposite sides, and a first connecting part 12 is formed on each of the parallel and opposite sides; that is, the housing 11 includes two first connecting parts 12, which are respectively located on the parallel and opposite sides of the housing 11; the scanning body 1 is located on the inside or outside of the wrist when worn.

[0048] The wrist-worn scanning device also includes a tightness adjustment module 2, which includes an adjustment rail 21 and an adjustment block 22. The adjustment rail 21 includes two parallel slide rails 211, which are grooves with openings facing each other and at least one end connected. The slide rail 211 includes a groove bottom 212. Multiple evenly arranged first engaging portions 213 are formed on the groove bottom 212 along the length of the slide rail 211. Two sliding strips 221 that are slidably adapted to the slide rails 211 are formed on the parallel opposite sides of the adjustment block 22, and are respectively installed in each slide rail 211. A second engaging member 222 is provided on one end of each sliding strip 221 facing the groove bottom 212. It can engage and disengage with the first engaging portion 213, and when engaged, the adjustment rail 21 and the adjustment block 22 are relatively fixed; when disengaged, the adjustment rail 21 and the adjustment block 22 can slide relative to each other. The overall length of the tightness adjustment module 2 is adjusted according to the position of the adjustment block 22 on the adjustment rail 21.

[0049] The wrist-worn scanning device also includes a first wristband 3 and a second wristband 4, both of which are elastic, flat, strip-shaped structures. One end of the first wristband 3 is connected to one of the first connecting parts 12 along its length, and the other end is connected to one end of the adjustment rail 21. One end of the second wristband 4 is connected to the other first connecting part 12 along its length, and the other end is connected to the end of the adjustment block 22 that is away from the second latching member 222. The first wristband 3, the second wristband 4, the tension adjustment module 2, and the scanning body 1 form a ring, and the size of the ring is adjusted by the tension adjustment module 2.

[0050] The wrist-worn scanning device of this invention allows for selection or adjustment of the strap length before being worn on the wrist. When worn, a closed loop is formed by the connection of the adjustment rails 21 of the tension adjustment module 2. The size of the closed loop is adjusted by regulating the overall length of the tension adjustment module 2, ensuring not only single-handed wear but also a secure and comfortable fit after wearing. The tension adjustment module 2 allows for quick and easy adjustment of the tightness, improving the efficiency of balanced adjustment for stability and comfort. Furthermore, the stability and secureness of the engagement adjustment between the double slide rails 211, double slide bars 221, and double first locking parts 213 with the double second locking parts 222 are enhanced.

[0051] The specific structure and operation of the wrist-worn scanning device of this utility model will be described in detail below through specific embodiments.

[0052] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A through hole 228 is formed on the slider 221 facing the bottom of the groove 212. It can be a round hole, a square hole or other holes of any shape.

[0053] The second snap-fit ​​member 222 is a cylindrical shape that is adapted to be installed in the through hole 228, and is installed in the through hole 228 through the elastic member 229; when the elastic member 229 is in a fully reset or partially reset state, one end of the second snap-fit ​​member 222 extends out of the slide bar 221 and snaps into the first snap-fit ​​part 213; when the elastic member 229 is in a stretched or compressed state, one end of the second snap-fit ​​member 222 retracts into the through hole 228.

[0054] The first locking part 213 is a groove; when one end of the second locking member 222 extends out of the slide bar 221, it is locked in the first locking part 213, so that the slide rail 211 is fixed relative to the slide bar 221 and cannot slide relative to it; when one end of the second locking member 222 retracts into the through hole 228, it is disengaged from the first locking part 213, so that the slide bar 221 can slide relative to the slide rail 211 to adjust its length.

[0055] In this embodiment, the wrist-worn scanning device uses an elastic element 229 to connect the second latching member 222 and the slide bar 221. The first latching part 213 is formed by a groove, which improves the stability of the connection between the second latching member 222 and the first latching part 213, reduces the difficulty of disengaging the first latching part 213 from the second latching member 222, and improves the efficiency of disengaging the first latching part 213 from the second latching member 222.

[0056] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The slide rail 211 is a U-shaped groove; one end of the second latching member 222 is formed with a second latching part 226 and a guide part 227 connected to each other, which are a vertical plane and an inclined plane facing the bottom of the groove 212, respectively; the guide part 227 forms an acute angle with the length direction of the slide bar 221 away from the second latching member 222.

[0057] The two side walls of the first locking part 213 are respectively fitted to the second locking part 226 and the guide part 227. This ensures that the second locking part 226 is securely engaged with the side wall of the first locking part 213 perpendicular to the bottom of the groove 212, and that the guide part 227 slides relative to the side wall of the first locking part 213 inclined to the bottom of the groove 212 when the closing ring is tightened, thus reducing the difficulty of adjustment and improving the adjustment efficiency.

[0058] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The tightness adjustment module 2 also includes a reset member 224, which is fixedly connected to the other end of the second snap-fit ​​member 222. When worn, it is located on the outside of the tightness adjustment module 2 and is used to stretch or compress the elastic member 229.

[0059] The wristband scanning device in this embodiment facilitates one-handed operation by setting a reset component 224, thereby improving the efficiency of opening or loosening the wristband.

[0060] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The adjusting block 22 is a square block; the slider 221 is a low step along the length of the adjusting block 22 and located on both sides of it.

[0061] A mounting portion 223, which is a groove, is formed in the middle of the adjusting member; a through hole 228 communicates with the mounting portion 223; a reset member 224 passes through the mounting portion 223 and is fixedly connected to the other end of the second snap-fit ​​member 222.

[0062] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5A blocking part is provided in the mounting part 223 at the position corresponding to the reset member 224. It is a protrusion that is fixedly connected to the slide bar 221 and protrudes from the bottom of the mounting part 223. The elastic member 229 is a helical spring. A blind hole 220 in the length direction of the second snap-fit ​​member 222 is formed on the reset member 224. One end of the elastic member 229 is fixedly installed in the blind hole 220, and the other end is connected to the protrusion, so that the elastic member 229 is in a compressed deformation state.

[0063] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A first handle 216 is formed at one end of the adjustment rail 21. It is a protrusion located outside the plane formed by the two slide rails 211 and connecting the two slide rails 211.

[0064] A second handle 225 is formed at one end of the adjusting block 22 near the second latch 222, which is a protrusion located on the outside of the plane formed by the two slide bars 221.

[0065] In this embodiment, the wrist-worn scanning device allows the index finger and thumb of one hand to bring the first handle 216 and the second handle 225 close together to apply force, which facilitates the tightening of the tightness adjustment module 2 and improves the tightening efficiency.

[0066] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The slide rail 211 also includes a second connecting part 214, which is a flat plate structure with the same length as the slide rail 211, and its two sides in the width direction are fixedly connected to one side wall of the two slide rails 211 respectively; it is connected to the wrist when worn.

[0067] The wrist-worn scanning device in this embodiment increases the contact area with the wrist skin by setting a second connecting part 214, thereby increasing friction, preventing rotation on the wrist, and improving the stability of wearing.

[0068] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The two slide rails 211 and the second connecting part 214 are integrated into one piece; the tension adjustment module 2 also includes a stabilizing member 215, which is a flat structure adapted to the outer side of the second connecting part 214 and is fixedly connected to the second connecting part 214; the stabilizing member 215 is made of latex material.

[0069] The wrist-worn scanning device in this embodiment increases friction and improves wrist comfort by setting a latex material stabilizer 215 to contact the skin of the wrist.

[0070] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The wrist-worn scanning device also includes two detachable modules 5, which include a first detachable mounting component 51 and a second detachable mounting component 52 that are detachably connected.

[0071] Two first detachable mounting parts 51 are fixedly connected to two first connecting parts 12 respectively; one second detachable mounting part 52 is fixedly connected to the other end of the first wristband 3, and the other second detachable mounting part 52 is fixedly connected to the other end of the second wristband 4.

[0072] The wrist-worn scanning device in this embodiment is equipped with a detachable module 5 to facilitate the separation of the first wristband 3, the second wristband 4, and the tightness adjustment module 2 from the scanning body 1, and to facilitate the replacement of the combination of the first wristband 3, the second wristband 4, and the tightness adjustment module 2.

[0073] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The first disassembly and installation component 51 is a cylindrical structure with a connecting groove 511 formed along its side that is connected in both the length direction and the inner and outer directions; a third snap-fit ​​part 512 is formed in the middle of the connecting groove 511, which is a U-shaped groove with the opening located on one side of the connecting groove 511.

[0074] The second disassembly and installation component 52 includes a fitting part 521 that is adapted to the first disassembly and installation component 51, and a fourth snap-fit ​​part 522 that is fixedly connected at one end to the middle of the fitting part 521 and at the other end to the other end of the first wristband 3 or the second wristband 4. The thickness of the fourth snap-fit ​​part 522 is adapted to the sliding installation of the connecting groove 511, and the width is adapted to the installation of the third snap-fit ​​part 512. The connecting groove 511 drives the fitting part 521 to be installed in the first disassembly and installation component 51 and snap-fitted in the third snap-fit ​​part 512.

[0075] The first disassembly and assembly part 51 is cylindrical; the assembly part 521 is cylindrical.

[0076] The wrist-worn scanning device of this embodiment improves the stability and comfort of installation through the installation of the fitting part 521 and the first disassembly and installation part 51; when worn, the third locking part 512 faces outward, and the fourth locking part 522 is kept inside the third locking part 512 by the arc structure of the wrist, thereby improving the stability of the connection.

[0077] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A wrist-worn scanning device, characterized in that, include: The scanning body includes a regularly shaped and flat shell and an identification code scanning module fixed inside the shell; the shell has a first connecting part formed on its parallel and opposite sides; the scanning body is worn on the inside or outside of the wrist. A tension adjustment module includes an adjustment rail and an adjustment block. The adjustment rail includes two parallel slide rails, each being a groove with its openings facing each other and at least one end connected. Each slide rail includes a groove bottom and a plurality of evenly arranged first engaging portions are formed along its length. The parallel, opposite sides of the adjustment block each have sliding strips adapted to the sliding installation of the slide rails, and these strips are respectively installed within each slide rail. A second engaging member is provided at one end of each sliding strip facing the groove bottom, which can engage and disengage with the first engaging portions. When engaged, the adjustment rail and the adjustment block are relatively fixed; when disengaged, the adjustment rail and the adjustment block can slide relative to each other. The first wristband is an elastic flat strip structure, with one end in the length direction connected to one of the first connecting parts and the other end connected to one end of the adjustment rail; The second wristband is an elastic, flat, strip-shaped structure. One end of its length is connected to another of the first connecting parts, and the other end is connected to the end of the adjusting block that is away from the second snap-fit ​​member.

2. The wrist-worn scanning device according to claim 1, characterized in that, A through hole is formed on the slide bar facing the bottom of the groove; The second snap-fit ​​component is fitted to the through hole and is installed in the through hole via an elastic element; when the elastic element is in the reset state, one end of the second snap-fit ​​component extends out of the slide bar; when the elastic element is in the stretched deformation state, one end of the second snap-fit ​​component retracts into the through hole. The first locking part is a groove; when one end of the second locking member extends out of the slide bar, it is locked in the first locking part; when one end of the second locking member retracts into the through hole, it disengages from the first locking part.

3. The wrist-worn scanning device according to claim 2, characterized in that, The slide rail has a U-shaped groove; One end of the second snap-fit ​​member has a connected second snap-fit ​​portion and a guide portion, which are respectively a vertical plane and an inclined plane facing the bottom of the groove; the guide portion forms an acute angle with the length direction of the slide bar away from the second snap-fit ​​member; The two side walls of the first snap-fit ​​portion are respectively fitted and adapted to the second snap-fit ​​portion and the guide portion.

4. The wrist-worn scanning device according to claim 3, characterized in that, It also includes a reset component, which is fixedly connected to the other end of the second snap-fit ​​component and is located outside the tightness adjustment module when worn, for stretching the elastic element.

5. The wrist-worn scanning device according to claim 4, characterized in that, The adjusting block is a square block; the slider is a low step located on both sides of the adjusting block along its length. A mounting portion, which is a groove, is formed in the middle of the adjusting block; the through hole communicates with the mounting portion; the reset member passes through the mounting portion and is fixedly connected to the other end of the second snap-fit ​​member.

6. The wrist-worn scanning device according to any one of claims 1 to 5, characterized in that, A first handle is formed at one end of the adjustment rail, which is a protrusion located outside the plane formed by the two slide rails and connecting the two slide rails; A second handle is formed at one end of the adjusting block near the second latching member, which is a protrusion located on the outside of the plane formed by the two slide bars.

7. The wrist-worn scanning device according to any one of claims 1 to 5, characterized in that, The slide rail component also includes a second connecting part, which is a flat plate structure with the same length as the slide rail, and its two sides in the width direction are respectively fixedly connected to one side wall of the two slide rails; when worn, it is connected to the wrist.

8. The wrist-worn scanning device according to claim 7, characterized in that, The two slide rails and the second connecting part are integrated into one piece; the tension adjustment module also includes a stabilizing component, which is a flat structure adapted to the outer side of the second connecting part and fixedly connected to the second connecting part; the stabilizing component is made of latex material.

9. The wrist-worn scanning device according to any one of claims 1 to 5, characterized in that, It also includes two detachable modules, which include a first detachable mounting component and a second detachable mounting component that are detachably connected; Two of the first disassembly and mounting components are fixedly connected to two of the first connecting parts respectively; one of the second disassembly and mounting components is fixedly connected to the other end of the first wristband, and the other of the second disassembly and mounting components is fixedly connected to the other end of the second wristband.

10. The wrist-worn scanning device according to claim 9, characterized in that, The first disassembly and installation component is a cylindrical structure with a connecting groove formed along its side that is connected in both the length direction and the inner and outer directions; a third snap-fit ​​part is formed in the middle of the connecting groove, which is a U-shaped groove with the opening located on one side of the connecting groove. The second disassembly and installation component includes a fitting part that is adapted to the first disassembly and installation component and a fourth snap-fit ​​part, one end of which is fixedly connected to the middle of the fitting part and the other end of which is fixedly connected to the other end of the first wristband or the second wristband. The thickness of the fourth snap-fit ​​part is adapted to the sliding installation of the connecting groove and the width is adapted to the installation of the third snap-fit ​​part. The fitting part is driven by the connecting groove to be installed in the first disassembly and installation component and snapped into the third snap-fit ​​part.

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