Self-powered foot posture detection system

Abstract

The invention relates to the technical field of motion detection, and discloses a self-powered foot posture detection system which comprises an energy collector and an energy collection circuit used for detecting the energy collector. The electromagnetic energy collector comprises a shell, and a buffer assembly, a ball screw assembly, a ratchet wheel assembly and an electromagnetic assembly which are arranged in the shell, the electromagnetic assembly comprises a copper coil arranged in the magnet array; the copper coil is provided with a plurality of output ends; the buffering assembly is used for buffering vertically-downward pressure applied by the foot of the human body. The ball screw assembly is used for converting vertically downward pressure into lifting motion and driving the ratchet wheel assembly to rotate so as to drive a magnet array in the electromagnetic assembly to rotate. The energy acquisition circuit is used for acquiring and analyzing the peak value of the output voltage of the copper coil and the frequency of the output voltage to obtain different motion states and motion states of a human body; according to the invention, long-term and continuous monitoring of foot postures is realized, and the portability and usability of equipment are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motion detection, and more particularly to a self-powered foot posture detection system. Background Art

[0002] With the continuous growth of the domestic economy and the improvement of people's living standards, health issues have gradually become the focus of social attention. In this context, foot health, as an important part of the overall health of an individual, has received more and more attention. Foot health is not only closely related to basic life functions such as daily walking and standing, but also closely related to the bones, joints, muscles and other systems of the whole body. A healthy foot structure can effectively support the posture balance of the whole body and avoid chain health problems caused by poor gait or abnormal foot posture, such as knee pain, lumbar strain and whole body muscle fatigue. Especially in the elderly population, foot problems often lead to inconvenience in movement, increase the risk of falling, and seriously affect the quality of life. In athletes and rehabilitation patients, abnormal foot posture may aggravate sports injuries or hinder the rehabilitation process. For athletes, accurate detection of gait and posture can help improve training posture, enhance sports performance, and effectively prevent injuries; for rehabilitation patients, especially those after surgery or with musculoskeletal diseases, foot posture monitoring is an indispensable tool in the rehabilitation process, which can help them adjust their walking posture and accelerate recovery. Therefore, accurate foot posture detection is not only crucial for specific groups of people, but also has a profound impact on the daily health management of the general public. However, existing foot posture detection systems face many challenges, especially the power supply problem limits the widespread application of the equipment. Traditional systems usually rely on batteries or external power supplies. The equipment is large and heavy, affecting the portability and comfort of use. More importantly, the limited battery life makes it impossible for the device to monitor continuously for a long time. Users need to replace or recharge frequently, which increases the cost and inconvenience of use. Especially in sports or rehabilitation scenarios, foot posture detection equipment often needs to run stably for a long time, and traditional battery power supply methods cannot meet this requirement. Summary of the invention

[0003] The purpose of the present invention is to provide a self-powered foot posture detection system, which converts the mechanical movement of the foot into electrical energy to provide the power required for the operation of the equipment, thereby realizing long-term and continuous monitoring of the foot posture and greatly improving the portability and ease of use of the equipment.

[0004] To achieve the above object, the present invention provides the following technical solutions: A self-powered foot posture detection system comprises: an energy harvester and an energy harvesting circuit for detecting the energy harvester; The energy harvester comprises: a housing, a buffer assembly, a ball screw assembly, a ratchet assembly and an electromagnetic assembly arranged inside the housing; the electromagnetic assembly comprises a magnet array and a copper coil; the copper coil is arranged inside the magnet array; the copper coil is provided with a plurality of output ends; The buffer component is used to buffer the vertical downward pressure exerted by the human foot; The ball screw assembly is used to convert the vertical downward pressure into a circular rotational motion, and drive the ratchet assembly to rotate, thereby driving the magnet array in the electromagnetic assembly to rotate; The energy collection circuit is connected to several output ends of the copper coil and is used to collect the peak value and frequency of the output voltage of the copper coil and analyze and obtain different motion states and motion states of the human body.

[0005] Furthermore, the buffer assembly includes: a circular support, a wave spring and a plane bearing arranged in sequence from top to bottom; One side of the circular support is provided with a slot and a thread, one end of the wave spring is engaged with the slot; the other end of the wave spring is connected to one side of the plane bearing; the ball screw assembly is connected with the thread of the circular support.

[0006] Further, the ball screw assembly comprises: a ball screw, a screw nut, a first bearing washer and a first ceramic bearing; One end of the ball screw passes through the plane bearing and is connected with the thread of the circular support, and the other end of the ball screw passes through the interior of the screw nut and is fixed in the screw retaining ring groove at the bottom center of the housing by a screw retaining ring; The first bearing gasket is installed on the screw nut; a flange is provided at one end of the screw nut close to the plane bearing; four screw holes are provided on the flange; an end of the screw nut away from the plane bearing is arranged inside the first ceramic bearing through an interference fit process, and the first ceramic bearing is installed in the ratchet assembly.

[0007] Further, the ratchet assembly comprises: ratchet teeth, ratchet washers, annular ratchet, and a second ceramic bearing; The ratchet teeth and the ratchet washers are provided with two each, and the two ratchet teeth are installed in the opposite diagonal screw holes of the flange; the two ratchet washers are installed in the remaining two diagonal screw holes of the flange; A ratchet groove that cooperates with the ratchet teeth is provided on the inner wall of the upper half of the annular ratchet; The first ceramic bearing is arranged on the inner diameter of the annular ratchet by an interference fit process; the magnet array is arranged on the inner wall of the lower half area of ​​the annular ratchet by an interference fit process; A limiting groove is also provided at the screw rod retaining ring groove at the bottom center of the housing, the second ceramic bearing is arranged in the limiting groove, and a second bearing gasket is also provided between the second ceramic bearing and the first ceramic bearing.

[0008] Furthermore, the magnet array is specifically: a plurality of magnets arranged in a circle; The calculation formula for the polarization angle of an odd number of magnets is: ; The formula for calculating the polarization angle of an even number of magnets is: .

[0009] Furthermore, the energy harvesting circuit includes: a first selection switch, a second selection switch, a first AC-DC conversion circuit, a second AC-DC conversion circuit, an energy management circuit, a dual-channel analog switch, an energy storage device, a signal detection circuit and an MCU control unit; The plurality of output ends of the copper coil include: a first output end, a second output end and a third output end; The first output terminal is connected to the first AC-DC conversion circuit; the second output terminal and the third output terminal are connected to the first gating switch and the second gating switch respectively; The first AC-DC conversion circuit is connected to the dual-way analog switch; the MCU control unit is respectively connected to the dual-way analog switch and the signal detection circuit; the dual-way analog switch is respectively connected to the signal detection circuit and the energy management circuit; The first gating switch and the second gating switch are respectively connected to the second AC-DC conversion circuit, the second AC-DC conversion circuit is connected to the energy management circuit, and the energy management circuit is connected to the energy storage device.

[0010] Furthermore, the first AC-DC conversion circuit is used to convert the three-phase alternating current output by the copper coil into direct current and input it into the dual-channel analog switch; The signal detection circuit is used to collect the frequency of the output voltage and the peak value of the output voltage of the copper coil according to the signal collection frequency; The MCU control unit is used to control the dual-channel analog switch to direct the current to the energy management circuit or the signal detection circuit according to the signal acquisition frequency, and adjust the signal acquisition frequency according to the frequency of the output voltage of the copper coil, and analyze the peak value and frequency of the output voltage of the copper coil to obtain the speed information when the human foot touches the ground; The speed information of the human foot when touching the ground is converted into multiple attenuation curves, and the time intervals of the multiple attenuation curves are calculated to obtain the step frequency information of the human movement; Using speed information and human movement frequency information to obtain different movement states and movement postures of the human body; The first gating switch and the second gating switch are controlled to close respectively according to different motion states and motion postures of the human body, so as to increase the damping of the electromagnetic energy harvester.

[0011] Furthermore, the first gating switch and the second gating switch are controlled to close respectively according to different motion states and motion postures of the human body to increase the damping of the electromagnetic energy harvester, specifically: When it is detected that the human body is in a running state, the second selection switch is closed to increase the damping of the energy harvester, thereby ensuring the comfort of the foot and improving the power generation of the energy harvester; When it is detected that the human body is in a fast walking state, the first gate switch is closed to increase the damping of the energy harvester, increase the rotation time of the energy harvester, and improve the power generation of the energy harvester; When it is detected that the human body is in a slow walking state, the first selection switch and the second selection switch are closed at the same time, the damping of the energy harvester is adjusted to the maximum, and the power generation of the energy harvester is increased.

[0012] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the present invention converts the mechanical movement of the foot (such as walking, running, the impact force of stepping on the ground, etc.) into electrical energy to provide the power required for the operation of the device; not only completely gets rid of the constraints of traditional power supplies, but also realizes long-term and continuous monitoring of foot posture, greatly improving the portability and ease of use of the device. In addition, the self-powered foot posture detection system enables the device to be embedded in the sole or insole through a lightweight and long-lasting design, with almost no additional weight added, so that the user will not feel uncomfortable in daily use. This lightweight design takes into account the durability of the device at the same time, providing users with a more comfortable wearing experience. Moreover, the system is equipped with a real-time data feedback function, so that users can understand the changes in their foot posture at any time. For rehabilitation patients, the device can provide rehabilitation suggestions through the detected gait data, help patients better adjust their posture, and promote rehabilitation progress; for athletes, the device can provide them with professional posture assessment and training guidance to improve their sports performance and reduce sports injuries. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] The following is a further description of the self-powered foot posture detection system of the present invention in conjunction with the accompanying drawings; Figure 1 is an exploded diagram of a self-powered foot posture detection system provided by the present invention; Figure 2 It is a magnet array arrangement diagram and a magnetic field distribution diagram in the self-powered foot posture detection system provided by the present invention; Figure 3 It is a winding diagram of a damping adjustment coil of a copper coil in a self-powered foot posture detection system provided by the present invention; Figure 4 It is a signal detection circuit diagram of the self-powered foot posture detection system provided by the present invention.

[0015] In the figure: 1. circular support; 2. wave spring; 3. plane bearing; 4. ball screw; 5. screw nut; 6. first bearing gasket; 7. ratchet teeth; 8. ratchet gasket; 9. first ceramic bearing; 10. annular ratchet; 11. second ceramic bearing; 12. copper coil; 13. magnet array; 14. housing. DETAILED DESCRIPTION

[0016] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, the present invention provides a self-powered foot posture detection system, comprising: an energy harvester and an energy harvesting circuit for detecting the energy harvester; The energy harvester comprises: a housing 14, a buffer assembly, a ball screw assembly, a ratchet assembly and an electromagnetic assembly arranged inside the housing 14; the electromagnetic assembly comprises a magnet array 13 and a copper coil 12; the copper coil 12 is arranged inside the magnet array 13; the copper coil 12 is provided with a plurality of output ends; The buffer component is used to buffer the vertical downward pressure exerted by the human foot; The ball screw assembly is used to convert the vertical downward pressure into a circular rotational motion, and drive the ratchet assembly to rotate, thereby driving the magnet array in the electromagnetic assembly to rotate; The energy collection circuit is connected to several output ends of the copper coil 12, and is used to collect the peak value and frequency of the output voltage of the copper coil 12 and analyze them to obtain different motion states and motion states of the human body.

[0019] The buffer assembly comprises: a circular support 1, a wave spring 2 and a plane bearing 3 which are arranged in sequence from top to bottom; One side of the circular support 1 is provided with a slot and a thread, and one end of the wave spring 2 is engaged with the slot; the other end of the wave spring 2 is connected to one side of the plane bearing 3; the ball screw assembly is connected to the thread of the circular support 1.

[0020] The ball screw assembly comprises: a ball screw 4, a screw nut 5, a first bearing washer 6 and a first ceramic bearing 9; One end of the ball screw 4 passes through the plane bearing 3 and is threadedly connected to the circular support 1, and the other end of the ball screw 4 passes through the interior of the screw nut 5 and is fixed in the screw retaining ring groove at the bottom center of the housing 14 by a screw retaining ring; The first bearing gasket 6 is installed on the screw nut 5; a flange is provided at one end of the screw nut 5 close to the plane bearing 3; four screw holes are provided on the flange; the end of the screw nut 5 away from the plane bearing 3 is arranged inside the first ceramic bearing 9 through an interference fit process, and the first ceramic bearing 9 is installed in the ratchet assembly.

[0021] It should be noted that the ball screw assembly includes a ball screw 4, a screw nut 5, and a ratchet assembly includes ratchet teeth 7, a ratchet washer 8, an annular ratchet 10, a second bearing washer, and a second ceramic bearing 11. The ball screw assembly and the ratchet assembly are the core structure of the electromagnetic energy harvester. The ball screw 4 converts the external longitudinal reciprocating motion into a circular reciprocating motion and expands the motion path, that is, through a high-lead screw, such as a 2mm / r screw, a 2mm vertical motion can be converted into a circular motion. With a copper coil 12 with a radius of 23mm, the actual outer diameter of the copper coil 12 moves 144mm, and the motion can be amplified 72 times through the ball screw 4. The ratchet assembly acts as a passive clutch. When the ball screw 4 moves downward, the screw nut 5 rotates counterclockwise, and the ratchet teeth 7 installed on the screw nut 5 rotate clockwise under the action of its own inertia and the pulling force of the screw nut 5. The distance between the edge of the ratchet teeth 7 and the center of the ball screw 4 increases, and the ratchet teeth 7 are stuck in the ratchet groove of the annular ratchet 10. The annular ratchet 10 forms a combination with the screw nut 5 through the action of the ratchet teeth 7, driving the magnet array to rotate together. When the ball screw 4 moves upward, the screw nut 5 rotates clockwise, and the ratchet teeth 7 installed on the screw nut 5 rotate counterclockwise under the action of its own inertia and the pulling force of the screw nut 5. The distance between the edge of the ratchet teeth 7 and the center of the ball screw 4 decreases, and the screw nut 5 and the ratchet teeth 7 are separated and move independently.

[0022] The ratchet assembly comprises: ratchet teeth 7, ratchet washers 8, annular ratchet 10 and a second ceramic bearing 11; The ratchet teeth 7 and the ratchet washers 8 are provided with two each, and the two ratchet teeth 7 are installed in the opposite diagonal screw holes of the flange; the two ratchet washers 8 are installed in the remaining two diagonal screw holes of the flange; A ratchet groove that cooperates with the ratchet teeth 7 is provided on the inner wall of the upper half of the annular ratchet 10; The first ceramic bearing 9 is arranged on the inner diameter of the annular ratchet 10 by an interference fit process; the magnet array 13 is arranged on the inner wall of the lower half of the annular ratchet 10 by an interference fit process; A limiting groove is also provided at the screw rod retaining ring groove at the bottom center of the housing 14 , and the second ceramic bearing 11 is arranged in the limiting groove. A second bearing gasket is also provided between the second ceramic bearing 11 and the first ceramic bearing 9 .

[0023] like Figure 2 and Figure 3 As shown, the magnet array comprises: a plurality of magnets arranged in a circular shape; The calculation formula for the polarization angle of an odd number of magnets is: ; The formula for calculating the polarization angle of an even number of magnets is: .

[0024] It should be noted that: in the magnet array 13, 24 magnets are arranged in a staggered manner, and the sequence numbers n of the 24 magnets are as follows: Figure 2 Starting from serial number ①, they increase counterclockwise. The specific arrangement is: Odd number magnets: Even number of magnets: The use of the new magnet array 13 can concentrate the magnetic field on one side of the coil inside the generator, significantly increase the magnetic flux, and thus enhance the power generation efficiency of the electromagnetic power generation system. At the same time, the optimized magnet array 13 can weaken the strength of the external magnetic field, reduce interference with surrounding equipment, and improve the stability and safety of the system. In addition, by rationally designing the layout of the magnet array, the magnetic field distribution inside the generator can be made more uniform, reducing mechanical friction and uneven force, thereby improving the life and reliability of the generator.

[0025] Furthermore, the layout of the magnet array 13 can also achieve adjustable magnetic field strength and direction, adapt to different working conditions, optimize power generation performance, and enhance the environmental adaptability of the electromagnetic power generation system, especially maintaining good performance in a high magnetic field environment.

[0026] In the copper coil 12, copper wires with diameters of 0.1mm, 0.2mm, and 0.4mm are used to wind three three-phase outputs on the same iron core. During the operation of the motor, a coil with a diameter of 0.1mm is used by default for power generation and signal acquisition. Other coils are used for appropriate damping adjustment and energy recovery when identifying different motion modes. By changing the combination of the access system, a total of 4 different damping states can be achieved, namely 0.1mm, 0.1-0.2mm, 0.1-0.4mm, and 0.1-0.2-0.4mm, to adapt to different motion modes and people.

[0027] like Figure 4 As shown, the energy harvesting circuit includes: a first selection switch, a second selection switch, a first AC-DC conversion circuit, a second AC-DC conversion circuit, an energy management circuit, a dual-channel analog switch, an energy storage device, a signal detection circuit and an MCU control unit; The plurality of output ends of the copper coil include: a first output end, a second output end and a third output end; The first output terminal is connected to the first AC-DC conversion circuit; the second output terminal and the third output terminal are connected to the first gating switch and the second gating switch respectively; The first AC-DC conversion circuit is connected to the dual-way analog switch; the MCU control unit is respectively connected to the dual-way analog switch and the signal detection circuit; the dual-way analog switch is respectively connected to the signal detection circuit and the energy management circuit; The first gating switch and the second gating switch are respectively connected to the second AC-DC conversion circuit, the second AC-DC conversion circuit is connected to the energy management circuit, and the energy management circuit is connected to the energy storage device.

[0028] The first AC-DC conversion circuit is used to convert the three-phase alternating current output by the copper coil 12 into direct current and input it into the dual-channel analog switch; The signal detection circuit is used to collect the frequency of the output voltage and the peak value of the output voltage of the copper coil 12 according to the signal collection frequency; The MCU control unit is used to control the dual-channel analog switch to direct the current to the energy management circuit or the signal detection circuit according to the signal acquisition frequency, and adjust the signal acquisition frequency according to the frequency of the output voltage of the copper coil 12, and analyze the peak value and frequency of the output voltage of the copper coil 12 to obtain the speed information when the human foot touches the ground; The speed information of the human foot when touching the ground is converted into multiple attenuation curves, and the time intervals of the multiple attenuation curves are calculated to obtain the step frequency information of the human movement; Using speed information and human movement frequency information to obtain different movement states and movement postures of the human body; The first gating switch and the second gating switch are controlled to close respectively according to different motion states and motion postures of the human body, so as to increase the damping of the electromagnetic energy harvester.

[0029] According to different motion states and motion postures of the human body, the first gating switch and the second gating switch are controlled to be closed respectively, so as to increase the damping of the electromagnetic energy harvester, specifically: When it is detected that the human body is in a running state, the second selection switch is closed to increase the damping of the energy harvester, thereby ensuring the comfort of the foot and improving the power generation of the energy harvester; When it is detected that the human body is in a fast walking state, the first gate switch is closed to increase the damping of the energy harvester, increase the rotation time of the energy harvester, and improve the power generation of the energy harvester; When it is detected that the human body is in a slow walking state, the first gate switch and the second gate switch are closed at the same time, and the damping of the energy harvester is adjusted to the maximum, thereby increasing the power generation of the energy harvester. It should be noted that the present invention includes a motion state analysis and an adaptive damping adjustment algorithm corresponding to the power generation structure. The motion posture analysis algorithm relies on the accurate measurement of the voltage of the electromagnetic energy harvester by the signal detection circuit. Each time the foot is pressed down, the electromagnetic power generation structure converts the slow longitudinal movement of the foot into a fast circular motion. After the foot is pressed down, due to the inertia of the mechanical structure, the magnet array will show a motion law of gradually decaying speed. The MCU control unit can obtain the motion state and motion posture of the human body, such as slow walking, fast walking, running, and jumping, by analyzing the output peak of the electromagnetic energy harvester, the rotation frequency of the electromagnetic energy harvester, and the human step frequency. The MUC adjusts the combination of the coil access circuit according to different motion states to adjust the input damping of the electromagnetic energy harvester and adjust the power output, thereby achieving a balance between comfort and power generation.

[0030] The specific steps are as follows: In the first step, the electromagnetic energy harvester converts the slow and tiny longitudinal movement of the human body into fast and large-scale rotational movement. The output end of the 1mm diameter coil converts the three-phase alternating current into direct current through the AC-DC conversion circuit and inputs it into the dual-channel analog switch circuit.

[0031] In the second step, the MCU control unit controls the dual analog switch to direct the current to the energy management circuit or the signal detection circuit according to the set signal acquisition frequency. The initial value of the MCU acquisition frequency is 50Hz, and then the signal detection circuit acquisition frequency is adjusted according to the voltage frequency, that is, the rotation frequency. The adjustment scheme is acquisition frequency = rotation frequency * 10.

[0032] In the third step, the MCU control unit analyzes the detected signal. The direct signal is the output peak value and rotation frequency of the energy harvester. By analyzing the above two signals, the speed information of the human foot touching the ground is obtained. The contour of the waveform output by the energy harvester is an attenuation curve. The step frequency of human movement is obtained by calculating the time interval of multiple attenuation curves. The human foot contact speed and movement step frequency are analyzed and classified to obtain different movement states and movement postures of the human body.

[0033] The fourth step is to control the closing of the first and second gate switches according to different motion states of the human body, thereby increasing the damping of the electromagnetic energy harvester. Specifically, when the human body is in a jumping state, no gate switch is closed. At this time, the system damping is minimal, and it can quickly respond to the movement of the human foot and improve comfort. When the human body is in a running state, the second gate switch is closed, and the damping of the energy harvester is appropriately increased to increase the system power generation while ensuring the comfort of the foot. When the human body is in a fast walking state, the first gate switch is closed, which greatly increases the damping of the energy harvester, increases the movement time of the energy harvester, and increases the system power generation. When the human body is in a slow walking state, the first and second gate switches are closed, the system damping is adjusted to the maximum, and the system power generation is increased.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-powered foot posture detection system, characterized in that: include: An energy harvester and an energy harvesting circuit for detecting the energy harvester; The energy harvester comprises: a housing (14), a buffer assembly, a ball screw assembly, a ratchet assembly and an electromagnetic assembly arranged inside the housing (14); the electromagnetic assembly comprises a magnet array (13) and a copper coil (12); the copper coil (12) is arranged inside the magnet array (13); the copper coil (12) is provided with a plurality of output ends; The buffer component is used to buffer the vertical downward pressure exerted by the human foot; The ball screw assembly is used to convert the vertical downward pressure into a circular rotational motion, and drive the ratchet assembly to rotate, thereby driving the magnet array in the electromagnetic assembly to rotate; The energy collection circuit is connected to a plurality of output ends of the copper coil (12) and is used to collect the peak value of the output voltage and the frequency of the output voltage of the copper coil (12) and analyze and obtain different motion states and motion states of the human body.

2. The self-powered foot posture detection system according to claim 1, characterized in that: The buffer assembly comprises: a circular support (1), a wave spring (2) and a plane bearing (3) which are arranged in sequence from top to bottom; One side of the circular support (1) is provided with a slot and a thread, and one end of the wave spring (2) is engaged with the slot; the other end of the wave spring (2) is connected to one side of the plane bearing (3); and the ball screw assembly is connected to the thread of the circular support (1) in a mating manner.

3. The self-powered foot posture detection system according to claim 2, characterized in that: The ball screw assembly comprises: a ball screw (4), a screw nut (5), a first bearing washer (6) and a first ceramic bearing (9); One end of the ball screw (4) passes through the plane bearing (3) and is threadedly connected to the circular support (1), and the other end of the ball screw (4) passes through the interior of the screw nut (5) and is fixed in the screw retaining spring groove at the bottom center of the housing (14) by means of a screw retaining spring; The first bearing gasket (6) is mounted on the screw nut (5); a flange is provided at one end of the screw nut (5) close to the plane bearing (3); four screw holes are provided on the flange; an end of the screw nut (5) away from the plane bearing (3) is arranged inside the first ceramic bearing (9) through an interference fit process, and the first ceramic bearing (9) is mounted in the ratchet assembly.

4. The self-powered foot posture detection system according to claim 3, characterized in that: The ratchet assembly comprises: ratchet teeth (7), a ratchet gasket (8), an annular ratchet (10) and a second ceramic bearing (11); The ratchet teeth (7) and the ratchet washers (8) are provided in two pieces respectively, and the two ratchet teeth (7) are installed in the opposite diagonal screw holes of the flange; and the two ratchet washers (8) are installed in the remaining two diagonal screw holes of the flange; A ratchet groove that cooperates with the ratchet teeth (7) is provided on the inner wall of the upper half of the annular ratchet (10); The first ceramic bearing (9) is arranged on the inner diameter of the annular ratchet (10) by means of an interference fit process; the magnet array (13) is arranged on the inner wall of the lower half of the annular ratchet (10) by means of an interference fit process; A limiting groove is also provided at the screw rod retaining ring groove at the bottom center of the housing (14), the second ceramic bearing (11) is arranged in the limiting groove, and a second bearing gasket is also provided between the second ceramic bearing (11) and the first ceramic bearing (9).

5. The self-powered foot posture detection system according to claim 4, characterized in that: The magnet array specifically comprises: a plurality of magnets arranged in a circle; The calculation formula for the polarization angle of an odd number of magnets is: ； The formula for calculating the polarization angle of an even number of magnets is: 。 6. The self-powered foot posture detection system according to claim 1, characterized in that: The energy collection circuit includes: a first selection switch, a second selection switch, a first AC-DC conversion circuit, a second AC-DC conversion circuit, an energy management circuit, a dual-channel analog switch, an energy storage device, a signal detection circuit and an MCU control unit; The copper coil (12) has a plurality of output ends, including: a first output end, a second output end and a third output end; The first output terminal is connected to the first AC-DC conversion circuit; the second output terminal and the third output terminal are connected to the first gating switch and the second gating switch respectively; The first AC-DC conversion circuit is connected to the dual-way analog switch; the MCU control unit is respectively connected to the dual-way analog switch and the signal detection circuit; the dual-way analog switch is respectively connected to the signal detection circuit and the energy management circuit; The first gating switch and the second gating switch are respectively connected to the second AC-DC conversion circuit, the second AC-DC conversion circuit is connected to the energy management circuit, and the energy management circuit is connected to the energy storage device.

7. The self-powered foot posture detection system according to claim 6, characterized in that: Said The first AC-DC conversion circuit is used to convert the three-phase alternating current output by the copper coil (12) into direct current and input it into the dual-channel analog switch; The signal detection circuit is used to collect the frequency of the output voltage of the copper coil (12) and the peak value of the output voltage according to the signal collection frequency; The MCU control unit is used to control the dual-channel analog switch to direct the current to the energy management circuit or the signal detection circuit according to the signal acquisition frequency, and adjust the signal acquisition frequency according to the frequency of the output voltage of the copper coil (12), analyze the peak value of the output voltage of the copper coil (12) and the frequency of the output voltage, and obtain the speed information when the human foot touches the ground; The speed information of the human foot when touching the ground is converted into multiple attenuation curves, and the time intervals of the multiple attenuation curves are calculated to obtain the step frequency information of the human movement; Using speed information and human movement frequency information to obtain different movement states and movement postures of the human body; The first gating switch and the second gating switch are controlled to close respectively according to different motion states and motion postures of the human body, so as to increase the damping of the electromagnetic energy harvester.

8. The self-powered foot posture detection system according to claim 7, characterized in that: According to different motion states and motion postures of the human body, the first gating switch and the second gating switch are controlled to be closed respectively, so as to increase the damping of the electromagnetic energy harvester, specifically: When it is detected that the human body is in a running state, the second selection switch is closed to increase the damping of the energy harvester, thereby ensuring the comfort of the foot and improving the power generation of the energy harvester; When it is detected that the human body is in a fast walking state, the first gate switch is closed to increase the damping of the energy harvester, increase the rotation time of the energy harvester, and improve the power generation of the energy harvester; When it is detected that the human body is in a slow walking state, the first selection switch and the second selection switch are closed at the same time, the damping of the energy harvester is adjusted to the maximum, and the power generation of the energy harvester is increased.

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