An adjustable inner diameter smart bracelet

Abstract

The present application belongs to the technical field of smart bracelet, and particularly relates to a smart bracelet with adjustable inner diameter. The technical scheme is as follows: a smart bracelet with adjustable inner diameter, comprising a smart bracelet main body and a flexible telescopic inner ring, two annular support side plates are connected between the smart bracelet main body and the flexible telescopic inner ring, and the smart bracelet main body, the flexible telescopic inner ring and the two annular support side plates enclose an inner diameter adjusting cavity; a plurality of arc-shaped support plates for supporting the flexible telescopic inner ring are arranged around the flexible telescopic inner ring in the inner diameter adjusting cavity, a transmission mechanism for driving the arc-shaped support plates to move in the radial direction is installed in the inner diameter adjusting cavity, an operating rod is connected to the output end of the transmission mechanism, and the other end of the operating rod extends out of the inner diameter adjusting cavity. The present application provides a smart bracelet capable of automatically, continuously and accurately adjusting the inner diameter according to the wrist size of a user, so as to solve the problems of poor fit, uncomfortable wearing and affected sensor measurement accuracy in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of smart bracelet technology, and specifically relates to a smart bracelet with an adjustable inner diameter. Background Technology

[0002] Smart bracelets, as wearable devices, are widely used in health monitoring, exercise recording, and mobile interaction. Currently, commercially available smart bracelets typically consist of a main body (containing electronic components, a display screen, a battery, etc.) and a strap-like structure (watchband) connected to the main body. When worn, the bracelet is secured to the user's wrist via positioning holes on the strap and a clasp, or through magnetic attraction, snaps, or other methods.

[0003] In existing technologies, smart bracelet straps are made of elastic materials such as silicone, relying on the material's own elastic deformation to adapt to wrists of different sizes. However, this solution has the following shortcomings in practical use: First, the pressure of the elastic strap on the wrist depends on the user's actual wrist circumference. When the wrist circumference is small and the strap is too long, the excess strap sticks up, affecting the fit and aesthetics; when the wrist circumference is large, the strap needs to be overstretched, resulting in excessive local pressure, causing discomfort and even affecting blood circulation. Second, to adapt to different wrist circumferences, most bracelets still use traditional perforated straps, changing the inner diameter of the bracelet's ring by selecting different positioning holes to fasten with the buckle. Although this adjustment method is simple in structure, the adjustment accuracy is limited by the hole spacing (usually 5-10mm), making it difficult to achieve continuous and precise inner diameter adjustment. Furthermore, users need to manually select the hole positions, which is inconvenient, especially for elderly people with poor eyesight or limited hand dexterity.

[0004] More importantly, the inner diameter of the ring structure formed by the aforementioned existing smart bracelets, whether elastic or perforated, is discrete and passively adjusted: the bracelet itself cannot actively sense the user's actual wrist size, nor can it automatically and continuously adjust its inner diameter to match that size based on the sensed measurement. This makes it difficult for the same bracelet to consistently provide optimal fit and comfort between different users or for the same user under different physiological conditions (such as edema or wrist circumference fluctuations due to seasonal changes). Furthermore, the mismatch in inner diameter can also affect the measurement accuracy of built-in sensors. For example, optical heart rate sensors may generate signal noise due to unstable pressure between the bracelet and the skin, thereby reducing the reliability of monitoring physiological parameters such as heart rate and blood oxygenation. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the purpose of this invention is to provide a smart bracelet that can automatically, continuously and accurately adjust its inner diameter according to the size of the user's wrist, so as to solve the problems of poor fit, discomfort when wearing and the impact on the measurement accuracy of sensors in the prior art.

[0006] The technical solution adopted in this invention is as follows: An adjustable inner diameter smart bracelet includes a smart bracelet body and a flexible telescopic inner ring. Two annular support side plates are connected between the smart bracelet body and the flexible telescopic inner ring. The smart bracelet body, the flexible telescopic inner ring, and the two annular support side plates form an inner diameter adjustment cavity. Several arc-shaped support plates for supporting the flexible telescopic inner ring are arranged around the flexible telescopic inner ring in the inner diameter adjustment cavity. A transmission mechanism for driving the arc-shaped support plates to move radially is installed in the inner diameter adjustment cavity. The output end of the transmission mechanism is connected to an operating rod, and the other end of the operating rod extends out of the inner diameter adjustment cavity.

[0007] When the operating lever is turned, it drives the transmission mechanism, which in turn drives several arc-shaped support plates to move radially in sync. This allows for precise adjustment of the inner diameter of the circle formed by the arc-shaped support plates. The flexible telescopic inner ring has a certain degree of elasticity, which allows the arc-shaped support plates to change the inner diameter of the flexible telescopic inner ring, ensuring that its size can adapt to different users' wrist sizes. The transmission mechanism can continuously and precisely adjust the position of the arc-shaped support plates, thus ensuring that the flexible telescopic inner ring fits well against the wrist, is comfortable to wear, and guarantees the accuracy of sensor measurements.

[0008] As a preferred embodiment of the present invention, the transmission mechanism includes a drive gear fixed to an operating lever, a synchronous gear ring concentric with the flexible telescopic inner ring rotatably connected in the inner diameter adjustment cavity, and the drive gear meshing with the synchronous gear ring; a telescopic rack is fixed on the arc-shaped support plate, and several double gears are also rotatably connected in the inner diameter adjustment cavity, the double gears including coaxial input gears and output gears, the several input gears meshing with the synchronous gear ring, and the several output gears meshing with the several telescopic racks one-to-one respectively.

[0009] When the operating lever is turned, the drive gear on the lever drives the synchronous gear ring to rotate, which in turn drives several input gears, causing several double gears to rotate synchronously. The output gear on the double gears drives the telescopic rack to move radially, thus causing the arc-shaped support plates to move accordingly. As the several arc-shaped support plates move synchronously, the inner diameter of the circular space they enclose is precisely adjusted. In this invention, the drive gear and the synchronous gear ring, the synchronous gear ring and the input gears, and the output gear and the telescopic rack can all transmit power precisely, thus enabling stepless adjustment of the inner diameter of the smart bracelet.

[0010] As a preferred embodiment of the present invention, a locking arc-shaped rack is also fixed on one side of the drive gear; when the operating lever is pulled up, the drive gear meshes with the synchronous gear ring; when the operating lever is pressed down, the locking arc-shaped rack meshes with multiple teeth of the synchronous gear ring.

[0011] When adjusting the inner diameter of the smart bracelet, pull the lever outwards to engage the drive gear with the synchronous gear ring. Rotating the lever then causes the drive gear on the lever to rotate the synchronous gear ring, thus adjusting the inner diameter of the smart bracelet. Once the inner diameter is adjusted, press the lever down. The locking arc-shaped rack on the lever engages with the multi-tooth synchronous gear ring. The locking arc-shaped rack and the lever are not concentric; rotating the lever to drive the locking arc-shaped rack would require a very large torque, thus locking the synchronous gear ring when the lever is pressed down.

[0012] In a preferred embodiment of the present invention, the operating lever extends from one side of the annular support plate, and a polygonal operating head is fixed to one end of the operating lever extending from the inner diameter adjustment cavity. A polygonal hole is provided on the outer side of the annular support plate. When the operating lever is pressed, the polygonal operating head is inserted into the polygonal hole. When the operating lever is pressed, the polygonal hole can restrict the rotation of the polygonal operating head, further locking the synchronous gear ring. When the operating lever is pressed, the polygonal operating head will not protrude too much from the annular support plate, preventing the operating lever from touching the wrist.

[0013] When the operating lever of this invention is pulled up, the inner diameter of the smart bracelet can be adjusted by rotating the lever; when the lever is pressed down, the inner diameter of the smart bracelet is fixed at a predetermined size. This invention achieves both inner diameter adjustment and locking through the operating lever, eliminating the need for complex structures and making operation convenient. Pressing down the operating lever not only retracts the lever but also locks the synchronous gear ring, providing a dual function.

[0014] As a preferred embodiment of the present invention, a limiting head is fixed at one end of the operating rod that extends into the inner diameter adjustment cavity, a guide cylinder is provided in the annular support side plate, the limiting head extends into the guide cylinder, and a retaining ring for blocking the limiting head is provided at the end of the guide cylinder.

[0015] When the operating lever is pulled up, the retaining ring limits the position of the limiting head on the operating lever. At this time, the drive gear and the synchronous gear ring mesh accurately, ensuring reliable meshing of the drive gear and the synchronous gear ring even when the inner diameter adjustment cavity is not visible from the outside. When the operating lever is pressed down, the limiting head on the operating lever contacts the inner wall of the annular support side plate. At this time, the locking arc-shaped rack meshes accurately with the synchronous gear ring, ensuring that the synchronous gear ring is reliably locked.

[0016] In a preferred embodiment of the present invention, a linear slide groove is provided within the inner diameter adjusting cavity, and a linear slider is fixed on the telescopic rack. The linear slider is fitted within the linear slide groove, and both ends of the linear slide groove are provided with limit ends. When the telescopic rack is driven to move radially, the linear slider reliably slides within the linear slide groove, ensuring that the telescopic rack is always reliably engaged with the output gear. The limit ends at both ends of the linear slide groove prevent the linear slider from dislodging from the linear slide groove, thereby accurately defining the inner and outer limit positions of the arc-shaped support plate.

[0017] In a preferred embodiment of the present invention, an annular groove is fixed inside the inner diameter adjustment cavity. The annular groove is concentric with the flexible telescopic inner ring. An annular slider is fixed on the synchronous gear ring, and the annular slider is fitted inside the annular groove. The inner diameter of the annular groove is larger than the inner diameter of the synchronous gear ring. When the drive gear drives the synchronous gear ring to rotate, the annular slider on the synchronous gear ring always rotates within the annular groove, thereby accurately limiting the synchronous gear ring and ensuring that both the drive gear and the locking arc-shaped rack can reliably mesh with the synchronous gear ring.

[0018] As a preferred embodiment of the present invention, the main body of the smart bracelet is provided with a ring-shaped flexible display screen and several ring grooves, and a rotating ring is provided in the ring grooves; both sides of the rotating ring are provided with limiting protrusions, and both sides of the ring grooves are provided with limiting ring grooves, with the limiting protrusions sleeved in the limiting ring grooves.

[0019] Because the smart bracelet of this invention has a ring-shaped flexible display screen mounted on its main body, the inner diameter cannot be adjusted using the elastic or perforated straps of existing smart bracelets. The limiting ring groove at the edge of the annular groove limits the limiting protrusion on the rotating ring, preventing the rotating ring from detaching from the smart bracelet body. Users can manipulate the rotating ring, enhancing the fun of the smart bracelet.

[0020] As a preferred embodiment of the present invention, a miniature induction coil is installed inside the main body of the smart bracelet, and a permanent magnet array is installed at the bottom of the rotating ring. The permanent magnet array is arranged correspondingly to the miniature induction coil. An energy storage power supply is installed inside the main body of the smart bracelet, and the miniature induction coil is electrically connected to the energy storage power supply. An upper ring groove is provided at the bottom of the rotating ring, and a lower ring groove is provided inside the main body of the smart bracelet. A plurality of rolling balls are arranged between the upper ring groove and the lower ring groove.

[0021] The permanent magnet array is embedded in the rotating ring, and the induction coil is fixed in the main body of the smart bracelet. Emergency power generation is achieved by the rotating ring cutting the magnetic field lines, ensuring that the smart bracelet can be powered in an emergency when no power source is available.

[0022] During the rotation of the rotating ring, the ball rolls between the upper and lower ring grooves, increasing the tactile and auditory feedback when rotating the ring, further enhancing the playability of the device.

[0023] In a preferred embodiment of the present invention, the flexible telescopic inner ring is made of one of the following materials: rubber ring, elastic band, or corrugated band. When the inner diameter of the circle formed by the several arc-shaped support plates changes, the flexible telescopic inner ring remains tightly fitted to the arc-shaped support plates, thus adjusting the inner diameter of the flexible telescopic inner ring according to the change in the position of the arc-shaped support plates. The flexible telescopic inner ring can cover and protect the several arc-shaped support plates, preventing them from directly contacting the skin and preventing dust and other impurities from entering the inner diameter adjustment cavity.

[0024] The beneficial effects of this invention are as follows: When the operating lever of this invention drives the transmission mechanism, the transmission mechanism drives several arc-shaped support plates to move radially synchronously, thereby accurately adjusting the inner diameter of the circle formed by the arc-shaped support plates. The flexible telescopic inner ring has a certain degree of elasticity, so the several arc-shaped support plates push the inner diameter of the flexible telescopic inner ring to change, ensuring that the size of the flexible telescopic inner ring can adapt to the wrist size of different users. The transmission mechanism can continuously and precisely adjust the position of the arc-shaped support plates, so that the flexible telescopic inner ring can fit well with the wrist, be comfortable to wear, and ensure the measurement accuracy of the sensor. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 2 Sectional view at point BB; Figure 5 yes Figure 4 A magnified view of a section at point C.

[0026] In the diagram: 1-Smart bracelet body; 2-Flexible telescopic inner ring; 3-Annular support side plate; 4-Inner diameter adjustment cavity; 5-Arc-shaped support plate; 6-Transmission mechanism; 7-Operating lever; 8-Annular flexible display screen; 9-Rotating ring; 11-Annular groove; 12-Miniature induction coil; 31-Polygonal hole; 32-Guide cylinder; 33-Blocking ring; 41-Straight groove; 42-Annular groove; 61-Drive gear; 62-Synchronous gear ring; 63-Telescopic rack; 64-Input gear; 65-Output gear; 66-Locking arc-shaped rack; 71-Polygonal operating head; 72-Limiting head; 91-Limiting convex ring; 92-Permanent magnet array; 93-Ball; 111-Limiting ring groove; 411-Limiting end; 621-Annular slider; 631-Straight slider. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0029] like Figures 1-5 As shown, the adjustable inner diameter smart bracelet of this embodiment includes a smart bracelet body 1 and a flexible telescopic inner ring 2. Two annular support side plates 3 are connected between the smart bracelet body 1 and the flexible telescopic inner ring 2. The smart bracelet body 1, the flexible telescopic inner ring 2 and the two annular support side plates 3 form an inner diameter adjustment cavity 4. Several arc-shaped support plates 5 for supporting the flexible telescopic inner ring 2 are arranged around the flexible telescopic inner ring 2 in the inner diameter adjustment cavity 4. A transmission mechanism 6 for driving the arc-shaped support plates 5 to move radially is installed in the inner diameter adjustment cavity 4. The output end of the transmission mechanism 6 is connected to an operating rod 7, and the other end of the operating rod 7 extends out of the inner diameter adjustment cavity 4.

[0030] When the operating lever 7 is turned, it drives the transmission mechanism 6 to move. The transmission mechanism 6 drives several arc-shaped support plates 5 to move radially synchronously, thereby accurately adjusting the inner diameter of the circle formed by the arc-shaped support plates 5. The flexible telescopic inner ring 2 has a certain degree of elasticity, so the arc-shaped support plates 5 push the inner diameter of the flexible telescopic inner ring 2 to change, ensuring that the size of the flexible telescopic inner ring 2 can adapt to the wrist size of different users. The transmission mechanism 6 can continuously and accurately adjust the position of the arc-shaped support plates 5, so that the flexible telescopic inner ring 2 can fit well with the wrist, be comfortable to wear, and ensure the accuracy of sensor measurements.

[0031] Specifically, such as Figures 2-4As shown, the transmission mechanism 6 includes a drive gear 61, which is fixed on the operating lever 7. A synchronous gear ring 62, concentric with the flexible telescopic inner ring 2, is rotatably connected in the inner diameter adjustment cavity 4. The drive gear 61 meshes with the synchronous gear ring 62. A telescopic rack 63 is fixed on the arc-shaped support plate 5. Several double gears are also rotatably connected in the inner diameter adjustment cavity 4. The double gears include coaxial input gears 64 and output gears 65. Several input gears 64 mesh with the synchronous gear ring 62, and several output gears 65 mesh with several telescopic racks 63 one by one.

[0032] When the operating lever 7 is turned, the drive gear 61 on the operating lever 7 drives the synchronous gear ring 62 to rotate, and the synchronous gear ring 62 drives several input gears 64, thereby causing several double gears to rotate synchronously. The output gear 65 on the double gears drives the telescopic rack 63 to move radially, thereby causing the arc-shaped support plate 5 to move accordingly. When the several arc-shaped support plates 5 move synchronously, the inner diameter of the circular space they enclose is precisely adjusted. In this invention, the drive gear 61 and the synchronous gear ring 62, the synchronous gear ring 62 and the input gears 64, and the output gear 65 and the telescopic rack 63 can all transmit power precisely, thus enabling stepless adjustment of the inner diameter of the smart bracelet.

[0033] like Figure 3 As shown, an input gear 64 and an output gear 65 are fixed on the shaft of the double gear. The two ends of the shaft of the double gear are rotatably connected to the annular support side plates 3 on both sides, so that the double gear is reliably supported.

[0034] In order to lock the synchronous gear ring 62, a locking arc-shaped rack 66 is also fixed on one side of the drive gear 61; when the operating lever 7 is pulled up, the drive gear 61 meshes with the synchronous gear ring 62; when the operating lever 7 is pressed down, the locking arc-shaped rack 66 meshes with multiple teeth of the synchronous gear ring 62.

[0035] When the inner diameter of the smart bracelet needs to be adjusted, pull the operating lever 7 outwards, causing the drive gear 61 to mesh with the synchronous gear ring 62. At this time, rotating the operating lever 7 will cause the drive gear 61 on the operating lever 7 to drive the synchronous gear ring 62 to rotate, thereby adjusting the inner diameter of the smart bracelet. After the inner diameter of the smart bracelet is adjusted, press the operating lever 7 down, causing the locking arc-shaped rack 66 on the operating lever 7 to mesh with the synchronous gear ring 62. The locking arc-shaped rack 66 and the synchronous gear ring 62 are meshed, and the locking arc-shaped rack 66 is not concentric with the operating lever 7. To drive the locking arc-shaped rack 66 to rotate by rotating the operating lever 7 would require a very large torque, thus the synchronous gear ring 62 is locked when the operating lever 7 is pressed down.

[0036] It should be noted that the middle tooth of the locking arc-shaped rack 66 is in a straight line with a tooth on the drive gear 61, so that when the operating lever 7 is pulled up, the synchronous gear ring 62 smoothly transitions from engaging with the locking arc-shaped rack 66 to engaging with the drive gear 61, and when the operating lever 7 is pressed down, the synchronous gear ring 62 smoothly transitions from engaging with the drive gear 61 to engaging with the locking arc-shaped rack 66, thus avoiding jamming and preventing the operating lever 7 from moving.

[0037] Furthermore, the operating lever 7 extends from the annular support side plate 3 on one side. A polygonal operating head 71 is fixed to one end of the operating lever 7 extending from the inner diameter adjustment cavity 4. A polygonal hole 31 is provided on the outer side of the annular support side plate 3. When the operating lever 7 is pressed, the polygonal operating head 71 inserts into the polygonal hole 31. When the operating lever 7 is pressed, the polygonal hole 31 restricts the rotation of the polygonal operating head 71, further locking the synchronous gear ring 62. When the operating lever 7 is pressed, the polygonal operating head 71 does not protrude too much from the annular support side plate 3, preventing the operating lever 7 from touching the wrist.

[0038] When the operating lever 7 of this invention is pulled up, the inner diameter of the smart bracelet can be adjusted by rotating the operating lever 7; when the operating lever 7 is pressed down, the inner diameter of the smart bracelet can be fixed at a certain size. This invention achieves both inner diameter adjustment and locking through the operating lever 7, eliminating the need for complex structures and making operation convenient. Pressing down the operating lever 7 not only retracts the operating lever 7 but also locks the synchronous gear ring 62, serving a dual function.

[0039] Furthermore, a limiting head 72 is fixed at one end of the operating lever 7 that extends into the inner diameter adjustment cavity 4. A guide cylinder 32 is provided inside the annular support side plate 3. The limiting head 72 extends into the guide cylinder 32. A retaining ring 33 for blocking the limiting head 72 is provided at the end of the guide cylinder 32.

[0040] When the operating lever 7 is pulled up, the retaining ring 33 limits the limiting head 72 on the operating lever 7. At this time, the drive gear 61 and the synchronous gear ring 62 accurately mesh, thus ensuring reliable meshing of the drive gear 61 and the synchronous gear ring 62 even when the inside of the inner diameter adjustment cavity 4 is not visible from the outside. When the operating lever 7 is pressed down, the limiting head 72 on the operating lever 7 contacts the inner wall of the annular support side plate 3. At this time, the locking arc-shaped rack 66 accurately meshes with the synchronous gear ring 62, ensuring that the synchronous gear ring 62 is reliably locked.

[0041] To guide the telescopic rack 63, a linear groove 41 is provided within the inner diameter adjustment cavity 4. A linear slider 631 is fixed to the telescopic rack 63 and is fitted within the linear groove 41. Limit ends 411 are provided at both ends of the linear groove 41. When the telescopic rack 63 is driven to move radially, the linear slider 631 slides reliably within the linear groove 41, ensuring that the telescopic rack 63 is always reliably engaged with the output gear 65. Limit ends 411 at both ends of the linear groove 41 prevent the linear slider 631 from dislodging from the linear groove 41, thereby accurately limiting the inner and outer limit positions of the arc-shaped support plate 5.

[0042] To guide the synchronous gear ring 62, an annular groove 42 is fixed inside the inner diameter adjustment cavity 4. The annular groove 42 is concentric with the flexible telescopic inner ring 2. An annular slider 621 is fixed on the synchronous gear ring 62 and is fitted inside the annular groove 42. The inner diameter of the annular groove 42 is larger than the inner diameter of the synchronous gear ring 62. When the drive gear 61 drives the synchronous gear ring 62 to rotate, the annular slider 621 on the synchronous gear ring 62 always rotates within the annular groove 42, thereby accurately limiting the synchronous gear ring 62 and ensuring that both the drive gear 61 and the locking arc-shaped rack 66 can reliably mesh with the synchronous gear ring 62.

[0043] like Figure 5 As shown, the main body 1 of the smart bracelet of the present invention is provided with an annular flexible display screen 8 and several annular grooves 11, and a rotating ring 9 is provided in the annular groove 11; both sides of the rotating ring 9 are provided with limiting protrusions 91, and both sides of the annular groove 11 are provided with limiting annular grooves 111, and the limiting protrusions 91 are sleeved in the limiting annular grooves 111.

[0044] Because the smart bracelet body 1 of this invention is equipped with a ring-shaped flexible display screen 8, the inner diameter cannot be adjusted using the elastic or perforated straps of existing smart bracelets. The limiting ring groove 111 at the edge of the annular groove 11 limits the limiting protrusion 91 on the rotating ring 9, thus preventing the rotating ring 9 from detaching from the smart bracelet body 1. Users can manipulate the rotating ring 9 to enhance the fun of the smart bracelet.

[0045] The circular flexible display screen 8 can achieve continuous display across the entire circumference of the wrist; the circular flexible display screen 8 is any one of flexible OLED screen, flexible Micro-LED screen, flexible Mini-LED screen, flexible electronic ink screen, and stretchable flexible display screen.

[0046] Furthermore, a miniature induction coil 12 is installed inside the main body 1 of the smart bracelet, and a permanent magnet array 92 is installed at the bottom of the rotating ring 9. The permanent magnet array 92 is correspondingly arranged with the miniature induction coil 12. An energy storage power supply is installed inside the main body 1 of the smart bracelet, and the miniature induction coil 12 is electrically connected to the energy storage power supply. An upper ring groove is provided at the bottom of the rotating ring 9, and a lower ring groove is provided inside the main body 1 of the smart bracelet. Several ball bearings 93 are arranged between the upper ring groove and the lower ring groove.

[0047] The permanent magnet array 92 is embedded in the rotating ring 9, and the induction coil is fixed in the main body 1 of the smart bracelet. Emergency power generation is achieved by rotating the rotating ring 9 to cut the magnetic field lines, ensuring that the smart bracelet can be powered in an emergency when no power source is available.

[0048] During the process of turning the rotating ring 9, the ball 93 rolls between the upper and lower ring grooves, increasing the tactile and auditory feedback when turning the rotating ring 9, and further improving the playability of the device.

[0049] It should be noted that the flexible telescopic inner ring 2 is made of one of the following materials: rubber ring, elastic band, or corrugated band. When the inner diameter of the circle formed by the several arc-shaped support plates 5 changes, the flexible telescopic inner ring 2 remains tightly fitted to the arc-shaped support plates 5, thus adjusting the inner diameter of the flexible telescopic inner ring 2 according to the change in position of the arc-shaped support plates 5. The flexible telescopic inner ring 2 can cover and protect the several arc-shaped support plates 5, preventing them from directly contacting the skin and preventing dust and other impurities from entering the inner diameter adjustment cavity 4.

[0050] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A smart bracelet with an adjustable inner diameter, characterized in that: The device includes a smart bracelet body (1) and a flexible telescopic inner ring (2). Two annular support side plates (3) are connected between the smart bracelet body (1) and the flexible telescopic inner ring (2). The smart bracelet body (1), the flexible telescopic inner ring (2) and the two annular support side plates (3) form an inner diameter adjustment cavity (4). Several arc-shaped support plates (5) for supporting the flexible telescopic inner ring (2) are arranged around the flexible telescopic inner ring (2) in the inner diameter adjustment cavity (4). A transmission mechanism (6) for driving the arc-shaped support plates (5) to move radially is installed in the inner diameter adjustment cavity (4). An operating rod (7) is connected to the output end of the transmission mechanism (6). The other end of the operating rod (7) extends out of the inner diameter adjustment cavity (4).

2. The smart bracelet with an adjustable inner diameter according to claim 1, characterized in that: The transmission mechanism (6) includes a drive gear (61), which is fixed on the operating lever (7). A synchronous gear ring (62) concentric with the flexible telescopic inner ring (2) is rotatably connected in the inner diameter adjustment cavity (4). The drive gear (61) meshes with the synchronous gear ring (62). A telescopic rack (63) is fixed on the arc-shaped support plate (5). Several double gears are also rotatably connected in the inner diameter adjustment cavity (4). The double gears include a coaxial input gear (64) and an output gear (65). Several input gears (64) mesh with the synchronous gear ring (62), and several output gears (65) mesh with several telescopic racks (63) respectively.

3. The smart bracelet with an adjustable inner diameter according to claim 2, characterized in that: A locking arc-shaped rack (66) is also fixed on one side of the drive gear (61); when the operating lever (7) is pulled up, the drive gear (61) meshes with the synchronous gear ring (62); when the operating lever (7) is pressed down, the locking arc-shaped rack (66) meshes with the synchronous gear ring (62) in multiple teeth.

4. A smart bracelet with an adjustable inner diameter according to claim 3, characterized in that: The operating lever (7) extends from the annular support side plate (3) on one side. A polygonal operating head (71) is fixed at one end of the operating lever (7) extending out of the inner diameter adjustment cavity (4). A polygonal hole (31) is provided on the outer side of the annular support side plate (3). When the operating lever (7) is pressed, the polygonal operating head (71) is inserted into the polygonal hole (31).

5. A smart bracelet with an adjustable inner diameter according to claim 3, characterized in that: One end of the operating lever (7) that extends into the inner diameter adjustment cavity (4) is fixed with a limiting head (72). A guide cylinder (32) is provided in the annular support side plate (3). The limiting head (72) extends into the guide cylinder (32). A retaining ring (33) for blocking the limiting head (72) is provided at the end of the guide cylinder (32).

6. A smart bracelet with an adjustable inner diameter according to claim 2, characterized in that: The inner diameter adjustment cavity (4) is provided with a linear slide groove (41), and a linear slider (631) is fixed on the telescopic rack (63). The linear slider (631) is sleeved in the linear slide groove (41), and both ends of the linear slide groove (41) are provided with limit ends (411).

7. A smart bracelet with an adjustable inner diameter according to claim 2, characterized in that: An annular groove (42) is fixed inside the inner diameter adjustment cavity (4). The annular groove (42) is concentric with the flexible telescopic inner ring (2). An annular slider (621) is fixed on the synchronous gear ring (62). The annular slider (621) is sleeved in the annular groove (42). The inner diameter of the annular groove (42) is larger than the inner diameter of the synchronous gear ring (62).

8. A smart bracelet with an adjustable inner diameter according to claim 1, characterized in that: The main body (1) of the smart bracelet is provided with a ring flexible display screen (8) and several ring grooves (11), and a rotating ring (9) is provided in the ring groove (11); a limiting protrusion (91) is provided on both sides of the rotating ring (9), and a limiting ring groove (111) is provided on both sides of the ring groove (11), and the limiting protrusion (91) is sleeved in the limiting ring groove (111).

9. A smart bracelet with an adjustable inner diameter according to claim 8, characterized in that: The smart bracelet body (1) is equipped with a miniature induction coil (12), and a permanent magnet array (92) is installed at the bottom of the rotating ring (9). The permanent magnet array (92) is correspondingly arranged with the miniature induction coil (12). The smart bracelet body (1) is equipped with an energy storage power supply, and the miniature induction coil (12) is electrically connected to the energy storage power supply. The bottom of the rotating ring (9) is provided with an upper ring groove, and the smart bracelet body (1) is provided with a lower ring groove. Several balls (93) are arranged between the upper ring groove and the lower ring groove.

10. A smart bracelet with an adjustable inner diameter according to any one of claims 1 to 9, characterized in that: The flexible telescopic inner ring (2) is made of one of the following materials: rubber ring, elastic band, or corrugated band.

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