Smart watch convenient to wear and tightness detection system thereof

Abstract

The invention relates to an intelligent watch, in particular to an intelligent watch convenient to wear and a tightness detection system thereof, and belongs to the technical field of intelligent watch application. The intelligent watch convenient to wear comprises a protective shell, an intelligent dial plate is embedded in the protective shell, and a supporting adjusting structure is installed in the protective shell; a tightness detecting structure is designed on the lower side of the supporting adjusting structure, combined adjusting structures are arranged at the two ends of the protective shell, watchband connecting pieces are clamped in the combined adjusting structures, the outer sides of the watchband connecting pieces are sleeved with self-adaptive watchbands, and distance sensors are installed on the inner sides of the self-adaptive watchbands. The fitting effect between the dial and the wrist is adjusted, the functional effect of the watch is increased, the tightness detection structure is matched to sensitively monitor the physical state of a user and the wearing effect of the watch, the use effect of the watch is improved, and the self-adaptive watchband is matched with the distance sensor to enable the watch to adjust the wearing effect in a self-adaptive manner, so that the user experience is improved. And the use comfort of the watch is improved.

Description

Technical Field

[0001] The present invention relates to a smart watch, in particular to a smart watch that is easy to wear and a tightness detection system thereof, belonging to the technical field of smart watch application. Background Art

[0002] Smartwatch is a wearable device with information processing capability. In addition to the function of indicating time like a traditional watch, it also integrates a variety of intelligent functions, providing users with a more convenient and comprehensive experience. Smartwatch has information processing capability, meets the basic technical requirements of watches, and has one or more functions such as reminder, navigation, calibration, monitoring, and interaction. At present, the mainstream smart wearable devices in the industry generally use PPG heart rate sensors. The basic principle is that the light of a specific wavelength (commonly 540nm green light) that penetrates into the skin is absorbed by the blood flowing in the capillaries on the surface of the skin, and the capillaries will contract at a corresponding frequency with each heartbeat, thereby affecting the absorption intensity of the incident light within the optical window range of the PPG sensor. By detecting the changing frequency of the intensity of the reflected light signal reflected back to the PPG sensor, the heart rate can be identified. From the perspective of wearing comfort, users should not wear the watch too tightly in daily non-exercise state to avoid discomfort caused by marks or sweating caused by wearing it too tightly. The main starting point of this article is how to remind users to tighten their watches appropriately when it is detected that the watch is worn loosely during exercise to ensure the accuracy of their heart rate.

[0003] However, existing watches require manual adjustment of the tightness of the straps, and the adjustment is very slow, which cannot fully meet the user's comfort needs. A common problem when using PPG heart rate sensors on watches is the influence of movement. When the user's arm moves, the loose watch will slide along the arm and flip perpendicular to the arm. This change in the optical path causes greater interference in the received reflected signal, affecting the accuracy of heart rate measurement. Although the industry already has a noise reduction algorithm based on motion artifacts of accelerometers and gyroscopes, in many cases, it cannot achieve the ideal effect of eliminating motion artifacts, which in turn affects the heart rate accuracy experience of smart watches.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an easy-to-wear smart watch and its tightness detection system in order to solve the above-mentioned problems, which has the function of autonomously adjusting to adapt to the user's exercise state and wearing effect, and improves the monitoring effect of the smart watch in exercise and leisure states.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a smart watch that is easy to wear, comprising a protective shell, a smart dial is embedded and installed inside the protective shell, a support adjustment structure is installed inside the protective shell, a looseness detection structure is designed on the lower side of the support adjustment structure, and a combined adjustment structure is arranged at both ends of the protective shell, a strap connector is installed inside the combined adjustment structure, an adaptive strap is mounted on the outer side of the strap connector, and a distance sensor is installed on the inner side of the adaptive strap.

[0007] Furthermore, in order to control the device to operate stably and efficiently, the smart dial is equipped with a main control chip, an RTC module, a USB module, a lithium battery charging and power meter, a voltage stabilizing module and an LCD touch screen display touch module, and the tightness detection structure is equipped with a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and an extended static charge sensor.

[0008] Furthermore, in order to adjust the fit between the dial part and the user, the support adjustment structure includes a support threaded tube, and support mounting holes are opened at the four corners of the protective shell. The support threaded tubes are rotatably installed in the inside of the support mounting holes, and the upper ends of the support threaded tubes are fixedly sleeved with a stabilizing sprocket ring, and the outer side of the stabilizing sprocket ring is meshed with a stabilizing chain, and the lower end of the support threaded tube is fixedly sleeved with an adjusting gear ring, and an adjusting motor is fixedly installed on one side of the inner part of the protective shell, and a power gear is fixedly installed on the output end of the adjusting motor, and the power gear and the adjusting gear ring are meshed with each other.

[0009] Furthermore, in order to improve the wearing comfort control effect of the watch, the tightness detection structure includes a support adjustment screw, which is rotatably engaged with the interior of the support threaded tube, and a pressure sensor is fixedly installed on the lower surface of the support adjustment screw. A spring telescopic rod is fixedly connected to the lower surface of the pressure sensor, and an intelligent sensor is fixedly installed on the output end of the spring telescopic rod.

[0010] Furthermore, in order to adjust the use effect of the watch strap, the combined adjustment structure includes a positioning screw, connecting card frames are designed at both ends of the protective shell, and adjustment mounting holes are opened at both ends of the connecting card frame. The positioning screw is rotatably clamped in the interior of the adjustment mounting hole, and an adjustment knob is provided at the upper end of the positioning screw. A synchronous sprocket ring is fixedly sleeved on the upper side of the positioning screw, and a synchronous chain is meshed on the outer side of the synchronous sprocket ring. A combined slider is slidably clamped in the interior of the connecting card frame, and a positioning threaded hole is opened at one end of the combined slider, and the positioning threaded hole and the positioning screw are rotatably engaged with each other, and a combination slot is opened at the other end of the combined slider.

[0011] Furthermore, in order to improve the efficiency of disassembly and assembly of the watch strap, the watch strap connector includes a combined connecting rod, telescopic sliding holes are opened at both ends of the adaptive watch strap, the combined connecting rod is respectively slidably engaged with the two ends of the telescopic sliding hole, the outer side of the combined connecting rod is provided with a supporting spring, one end of the support spring and the combined connecting rod are fixedly connected to each other, the other end of the support spring and the adaptive watch strap are fixedly connected to each other, one end of the combined connecting rod is designed with a disassembly push rod, an extension through hole is opened on one side of the telescopic sliding hole, the disassembly push rod and the extension through hole are slidably engaged with each other.

[0012] Furthermore, in order to automatically and steplessly adjust the contraction range of the strap, the adaptive strap includes a positioning strap and a telescopic strap, one end of the positioning strap is mutually connected to one end of the protective shell, and one end of the telescopic strap is mutually connected to the other end of the protective shell, a guide storage rail is provided on the outer side of the positioning strap, and connecting teeth are evenly designed on the outer side of the telescopic strap, and the telescopic strap and the guide storage rail are slidably engaged with each other, and an adaptive mounting frame is fixedly installed on the other end of the positioning strap, and an adaptive bidirectional motor is inlaid on the lower side of the adaptive mounting frame, and a positioning gear is fixedly installed on the output end of the adaptive bidirectional motor, and the positioning gear is meshed with the connecting teeth, and a belt buckle is transferred to the outer side of the adaptive mounting frame, and the inner side of the belt buckle is slidably engaged with the connecting teeth.

[0013] A wearable smart watch tightness detection system includes a main control chip, a PPG signal acquisition module, an RTC module, a USB module, a lithium battery charging and electricity meter, a voltage stabilization module, an LCD touch screen display touch module, and a tightness control and adjustment module. The main control chip adopts an STM32L4 series chip. This series of devices integrates a large number of intelligent execution peripherals and has a variety of advanced low-power analog functions, so that low-power operation can be achieved in watch applications; the PPG signal acquisition module measures the light reflection changes on the skin surface through a photoelectric sensor to capture the fluctuation of blood passing through the skin blood vessels when the heart beats. This sensor can obtain a more accurate pulse wave waveform and real-time heart rate data through a specific algorithm. The RTC module uses MCP7940N as the system clock chip. MCP7940N is a low-power real-time clock chip, which is very suitable for smart watches that need to run for a long time. Its low power consumption characteristics help to extend the standby time and battery life of the watch, providing users with a longer experience without charging. It has high precision and stability, which can ensure the accuracy of the time displayed by the smart watch. The lithium battery charging and fuel gauge are equipped with independent power supplies to meet the needs of wearability and mobility. The lithium battery module is used to power the entire system in the entire design. The MAX17043 battery fuel gauge chip can accurately measure the battery power and extend the battery life. The built-in temperature sensor performs temperature compensation to improve the measurement accuracy, including multiple protection functions such as overvoltage, undervoltage, overcurrent, and overtemperature. The USB module provides power for lithium battery charging. The voltage regulator module and LCD touch screen display touch module provide high resolution, high contrast and bright color performance through the LCD screen, presenting detailed images and clear text, so that the LCD touch screen presents excellent display effects on the smart watch.

[0014] The tightness control and adjustment module includes the support adjustment structure, the tightness detection structure, the adaptive watch strap and the distance sensor. The support adjustment structure integrates a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and extended static charge sensing parts to control the distance between the smart watch face and the back of the user's hand. The user's physical condition and the wearing state of the device are monitored in real time through the internal parts of the tightness detection structure. The distance sensor monitors the distance between the watch strap and the user's wrist and adjusts the contraction range of the adaptive watch strap accordingly.

[0015] The technical effects and advantages of the present invention are as follows: a support adjustment structure is used to adjust the fit between the dial and the wrist, thereby increasing the functional effect of the watch; a tightness detection structure is used to sensitively monitor the user's physical condition and the wearing effect of the watch, thereby improving the use effect of the watch; and an adaptive strap and a distance sensor cooperate with each other to enable the watch to adaptively adjust the wearing effect, thereby improving the comfort of using the watch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0017] Figure 2 It is a bottom view structural schematic diagram of the present invention;

[0018] Figure 3 It is a side cross-sectional structural schematic diagram of the present invention;

[0019] Figure 4 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the supporting and adjusting structural part of the present invention;

[0021] Figure 6 It is a schematic diagram of the internal structure of the protective shell part of the present invention;

[0022] Figure 7 It is a structural schematic diagram of the positioning strap part in the present invention;

[0023] Figure 8 It is a schematic structural diagram of the telescopic strap part of the present invention;

[0024] Fig. 9 It is a schematic diagram of the expanded structure of the tightness detection structure part in the present invention;

[0025] Fig.10 It is a structural schematic diagram of the tightness detection structure part in the present invention;

[0026] Fig.11 A signal connection diagram of the system hardware in the present invention;

[0027] Fig.12 It is a system working flow diagram of the present invention.

[0028] In the figure: 1. Protective shell; 2. Smart dial; 3. Support adjustment structure; 301. Support threaded tube; 302. Stabilizing sprocket ring; 303. Stabilizing chain; 304. Adjusting gear ring; 305. Adjusting motor; 4. Looseness detection structure; 401. Support adjustment screw; 402. Pressure sensor; 403. Spring telescopic rod; 404. Smart sensor; 5. Combined adjustment structure; 501. Positioning screw; 502. Synchronous sprocket ring; 503. Synchronous chain; 504. Combined slider; 6. Strap connector; 601. Combined connecting rod; 602. Support spring; 7. Adaptive strap; 701. Positioning strap; 702. Telescopic strap; 703. Adaptive mounting frame; 704. Adaptive bidirectional motor; 705. Positioning gear; 706. Belt buckle; 8. Distance sensor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-12 As shown, a smart watch that is easy to wear includes a protective shell 1, a smart dial 2 is embedded and installed inside the protective shell 1, a support adjustment structure 3 is installed inside the protective shell 1, a tightness detection structure 4 is designed on the lower side of the support adjustment structure 3, and combined adjustment structures 5 are arranged at both ends of the protective shell 1. A strap connector 6 is mounted inside the combined adjustment structure 5, an adaptive strap 7 is mounted on the outer side of the strap connector 6, and a distance sensor 8 is installed on the inner side of the adaptive strap 7.

[0031] The smart dial 2 is internally installed with a main control chip, an RTC module, a USB module, a lithium battery charging and power meter, a voltage stabilizing module and an LCD touch screen display touch module; the tightness detection structure 4 is internally installed with a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and an extended static charge sensor. The control device is operated and the software program is edited inside it so that the device can quickly detect the user's physical condition.

[0032] The support adjustment structure 3 includes a support threaded tube 301. Support mounting holes are opened at the four corners of the protective shell 1. The support threaded tubes 301 are rotatably installed inside the support mounting holes respectively. The upper ends of the support threaded tubes 301 are fixedly sleeved with a stabilizing sprocket ring 302. The outer side of the stabilizing sprocket ring 302 is meshed with a stabilizing chain 303 to drive the support threaded tube 301 to rotate synchronously. The lower end of the support threaded tube 301 is fixedly sleeved with an adjusting gear ring 304. An adjusting motor 305 is fixedly installed on one side of the interior of the protective shell 1. A power gear is fixedly installed on the output end of the adjusting motor 305. The power gear and the adjusting gear ring 304 are meshed with each other to adjust the extension position of the tightness detection structure 4.

[0033] The tightness detection structure 4 includes a support adjustment screw 401, which is rotatably engaged with the inside of the support threaded tube 301. A pressure sensor 402 is fixedly installed on the lower surface of the support adjustment screw 401 to detect the pressure received by the tightness detection structure 4 and assist in controlling the adaptive strap 7 to adjust the contraction range. A spring telescopic rod 403 is fixedly connected to the lower surface of the pressure sensor 402, and an intelligent sensor 404 is fixedly installed on the output end of the spring telescopic rod 403. The intelligent sensor 404 is an integrated device of a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and an extended static charge sensor, which can realize rapid monitoring and collection of user and device status information.

[0034] The combined adjustment structure 5 includes a positioning screw 501. Connecting card frames are designed at both ends of the protective shell 1. Adjustment mounting holes are opened at both ends of the connecting card frames. The positioning screw 501 is rotatably clamped in the inside of the adjustment mounting hole. An adjustment knob is set on the upper end of the positioning screw 501. A synchronous sprocket ring 502 is fixedly sleeved on the upper side of the positioning screw 501. A synchronous chain 503 is meshed on the outer side of the synchronous sprocket ring 502 to improve the adjustment effect of the strap position. A combined slider 504 is slidably clamped inside the connecting card frame. A positioning threaded hole is opened at one end of the combined slider 504. The positioning threaded hole and the positioning screw 501 are rotatably engaged with each other to flexibly adjust the connection distance between the strap and the protective shell 1. The other end of the combined slider 504 is A combination card slot is provided to facilitate the disassembly and assembly of the watch strap. The watch strap connector 6 includes a combination connecting rod 601. Telescopic sliding holes are provided at both ends of the adaptive watch strap 7. The combination connecting rod 601 is slidably engaged with the two ends of the telescopic sliding holes respectively. A support spring 602 is provided on the outer side of the combination connecting rod 601. One end of the support spring 602 is fixedly connected to the combination connecting rod 601, and the other end of the support spring 602 is fixedly connected to the adaptive watch strap 7, thereby improving the stability of the connection between the adaptive watch strap 7 and the protective shell 1. A disassembly push rod is designed at one end of the combination connecting rod 601, and an extension through hole is provided on one side of the telescopic sliding hole. The disassembly push rod and the extension through hole are slidably engaged with each other, thereby improving the flexibility of disassembly and assembly of the adaptive watch strap 7.

[0035] The adaptive strap 7 includes a positioning strap 701 and a telescopic strap 702. One end of the positioning strap 701 is connected to one end of the protective shell 1, and one end of the telescopic strap 702 is connected to the other end of the protective shell 1. A guide storage rail is provided on the outer side of the positioning strap 701, and connecting teeth are evenly designed on the outer side of the telescopic strap 702. The telescopic strap 702 and the guide storage rail are slidably engaged with each other, so as to facilitate the adjustment of the contraction range of the inner side of the adaptive strap 7. An adaptive mounting frame 703 is fixedly installed on the other end of the positioning strap 701, and an adaptive bidirectional motor 704 is inlaid and installed on the lower side of the adaptive mounting frame 703. A positioning gear 705 is fixedly installed on the output end of the adaptive bidirectional motor 704, and the positioning gear 705 is meshed with the connecting teeth to adjust and fix the extension length of the telescopic strap 702. A belt buckle 706 is connected to the outer side of the adaptive mounting frame 703, and the inner side of the belt buckle 706 is slidably engaged with the connecting teeth to improve the fixing effect of the adaptive strap 7.

[0036] When in use, the staff edits the software program inside the device, adjusts the working effects between various parts, and improves the monitoring effect of the device. The main control chip uses the STM32L4 series chip, which integrates a large number of intelligent execution peripherals and has a variety of advanced low-power analog functions, so that low-power operation can be achieved in watch applications; the PPG signal acquisition module measures the changes in light reflection on the skin surface through a photoelectric sensor, and captures the fluctuations of blood passing through the skin blood vessels when the heart beats. This sensor can obtain a more accurate pulse wave waveform, and real-time heart rate data can be obtained through a specific algorithm. The RTC module uses MCP7940N as the system's clock chip. MCP7940N is a low-power real-time clock chip, which is very suitable for smart watches that need to run for a long time. Its low power consumption characteristics help to extend the watch. Standby time and battery life provide users with a longer experience without charging. It has high precision and stability, which can ensure the accuracy of the time displayed by the smart watch. The lithium battery charging and fuel gauge are equipped with independent power supplies to meet the needs of wearability and mobility. The lithium battery module is used to power the entire system in the entire design. The MAX17043 battery fuel gauge chip is used to accurately measure the battery power and extend the battery life. The built-in temperature sensor performs temperature compensation to improve the measurement accuracy, including multiple protection functions such as overvoltage, undervoltage, overcurrent, and overtemperature. The USB module provides power for lithium battery charging. The voltage regulator module and LCD touch screen display touch module provide high resolution, high contrast and bright color performance through the LCD screen, presenting detailed images and clear text, so that the LCD touch screen presents excellent display effects on the smart watch.

[0037] The tightness control and adjustment module includes a support adjustment structure 3, a tightness detection structure 4, an adaptive strap 7 and a distance sensor 8. The support adjustment structure 3 integrates a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and extended static charge sensing parts to control the distance between the smart watch face 2 and the back of the user's hand. The user's physical condition and the wearing status of the device are monitored in real time through the internal parts of the tightness detection structure 4. The distance sensor 8 monitors the distance between the strap and the user's wrist and adjusts the contraction range of the adaptive strap 7 accordingly.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wearable smart watch, comprising a protective shell (1), wherein a smart dial (2) is embedded and installed inside the protective shell (1), characterized in that: A support adjustment structure (3) is installed inside the protective shell (1), a looseness detection structure (4) is designed on the lower side of the support adjustment structure (3), and a combined adjustment structure (5) is arranged at both ends of the protective shell (1), a watch strap connector (6) is mounted inside the combined adjustment structure (5), an adaptive watch strap (7) is mounted on the outer side of the watch strap connector (6), and a distance sensor (8) is installed on the inner side of the adaptive watch strap (7).

2. A wearable smart watch according to claim 1, characterized in that: The smart dial (2) is internally installed with a main control chip, an RTC module, a USB module, a lithium battery charging and electricity meter, a voltage stabilization module and an LCD touch screen display touch module, and the tightness detection structure (4) is internally installed with a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope, and an extended static charge sensor.

3. The wearable smart watch according to claim 1, characterized in that: The support adjustment structure (3) comprises a support threaded tube (301), support installation holes are provided at four corners of the protective shell (1), the support threaded tube (301) is rotatably installed inside the support installation holes, the upper end of the support threaded tube (301) is fixedly sleeved with a stabilizing sprocket ring (302), the outer side of the stabilizing sprocket ring (302) is sleeved and meshed with a stabilizing chain (303), the lower end of the support threaded tube (301) is fixedly sleeved with an adjusting gear ring (304), an adjusting motor (305) is fixedly installed on one side of the inner part of the protective shell (1), a power gear is fixedly installed on the output end of the adjusting motor (305), and the power gear and the adjusting gear ring (304) are meshed with each other.

4. The wearable smart watch according to claim 3, characterized in that: The tightness detection structure (4) comprises a support adjustment screw (401), the support adjustment screw (401) is rotatably engaged with the interior of the support threaded tube (301), a pressure sensor (402) is fixedly mounted on the lower surface of the support adjustment screw (401), a spring telescopic rod (403) is fixedly connected to the lower surface of the pressure sensor (402), and an intelligent sensor (404) is fixedly mounted on the output end of the spring telescopic rod (403).

5. The wearable smart watch according to claim 1, characterized in that: The combined adjustment structure (5) comprises a positioning screw (501), and connecting card frames are designed at both ends of the protective shell (1). Adjustment mounting holes are provided at both ends of the connecting card frames. The positioning screw (501) is rotatably engaged with the inside of the adjustment mounting hole. An adjustment knob is provided at the upper end of the positioning screw (501). A synchronous sprocket ring (502) is fixedly sleeved on the upper side of the positioning screw (501), and a synchronous chain (503) is sleeved and meshed on the outer side of the synchronous sprocket ring (502). A combined slider (504) is slidably engaged inside the connecting card frame. A positioning threaded hole is provided at one end of the combined slider (504), and the positioning threaded hole and the positioning screw (501) are rotatably engaged with each other. A combined slot is provided at the other end of the combined slider (504).

6. The wearable smart watch according to claim 5, characterized in that: The watchband connector (6) comprises a combined connecting rod (601), telescopic sliding holes are provided at both ends of the adaptive watchband (7), the combined connecting rod (601) is respectively slidably engaged with the two ends of the telescopic sliding holes, a support spring (602) is provided on the outer side of the combined connecting rod (601), one end of the support spring (602) and the combined connecting rod (601) are fixedly connected to each other, the other end of the support spring (602) and the adaptive watchband (7) are fixedly connected to each other, a disassembly push rod is designed at one end of the combined connecting rod (601), an extension through hole is provided on one side of the telescopic sliding hole, and the disassembly push rod and the extension through hole are slidably engaged with each other.

7. The wearable smart watch according to claim 1, characterized in that: The adaptive watchband (7) comprises a positioning watchband (701) and a telescopic watchband (702); one end of the positioning watchband (701) is mutually connected to one end of the protective shell (1); one end of the telescopic watchband (702) is mutually connected to the other end of the protective shell (1); a guide receiving rail is provided on the outer side of the positioning watchband (701); connecting teeth are evenly arranged on the outer side of the telescopic watchband (702); the telescopic watchband (702) and the guiding receiving rail are mutually slidably connected; the positioning watchband (701) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the positioning watchband (701) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (702) is mutually connected to one another; the telescopic watchband (701 ... An adaptive mounting frame (703) is fixedly mounted on the other end of the strap (701), an adaptive bidirectional motor (704) is embedded on the lower side of the adaptive mounting frame (703), a positioning gear (705) is fixedly mounted on the output end of the adaptive bidirectional motor (704), the positioning gear (705) and the connecting teeth are meshed with each other, a belt buckle (706) is connected to the outer side of the adaptive mounting frame (703), and the inner side of the belt buckle (706) and the connecting teeth are slidably engaged with each other.

8. A tightness detection system, characterized in that: It includes a main control chip, a PPG signal acquisition module, an RTC module, a USB module, a lithium battery charging and power meter, a voltage stabilization module, an LCD touch screen display touch module, and a tension control adjustment module. The main control chip adopts the STM32L4 series chip. This series of devices integrates a large number of intelligent execution peripherals and has a variety of advanced low-power analog functions, so that low-power operation can be achieved in watch applications; the PPG signal acquisition module measures the light reflection changes on the skin surface through a photoelectric sensor to capture the fluctuations of blood passing through the skin blood vessels when the heart beats. This sensor can obtain a more accurate pulse wave waveform and real-time heart rate data through a specific algorithm. The RTC module uses MCP7940N as the system clock chip. MCP7940N is a low-power real-time clock chip, which is very suitable for smart watches that need to run for a long time. Its low The power consumption characteristics help to extend the standby time and battery life of the watch, providing users with a longer experience without charging. It has high precision and stability, which can ensure the accuracy of the time displayed by the smart watch. The lithium battery charging and fuel gauge are equipped with independent power supplies to meet the needs of wearability and mobility. The lithium battery module is used to power the entire system in the entire design. The MAX17043 battery fuel gauge chip is used to accurately measure the battery power and extend the battery life. The built-in temperature sensor performs temperature compensation to improve the measurement accuracy, including multiple protection functions such as overvoltage, undervoltage, overcurrent, and overtemperature. The USB module provides power for lithium battery charging. The voltage regulator module and LCD touch screen display touch module provide high resolution, high contrast and bright color performance through the LCD screen, presenting detailed images and clear text, so that the LCD touch screen presents excellent display effects on the smart watch. The tightness control and adjustment module comprises the support adjustment structure (3), the tightness detection structure (4), the adaptive watch strap (7) and the distance sensor (8); the support adjustment structure (3) integrates a PPG signal acquisition module, a 3-axis digital accelerometer, a 3-axis digital gyroscope and an extended static charge sensing component to control the distance between the smart watch face (2) and the back of the user's hand; the user's physical state and the wearing state of the device are monitored in real time through the internal components of the tightness detection structure (4); the distance sensor (8) monitors the distance between the watch strap and the user's wrist and cooperates to adjust the contraction range of the adaptive watch strap (7).

Images