CN-122004845-A - Self-powered wearable gait monitoring device

CN122004845ACN 122004845 ACN122004845 ACN 122004845ACN-122004845-A

Abstract

The invention discloses a self-powered wearable gait monitoring device, which relates to the technical field of motion monitoring and comprises a first connecting piece, a friction material, an electrode pair, a second connecting piece, a planetary gear mechanism, a magnetic material and a coil, wherein the first connecting piece is fixed with a lower leg, the friction material is fixed with the first connecting piece, the electrode pair is fixed with the second connecting piece, the second connecting piece is fixed with a thigh, the electrode pair is attached to the outside of the friction material, the friction material comprises a plurality of arc-shaped friction plates distributed circumferentially, the electrode pair comprises a plurality of arc-shaped electrode plates distributed circumferentially, the planetary carrier is connected with the first connecting piece, a planetary gear is rotatably arranged on the planetary carrier, a sun gear is meshed with the planetary gear, a gear ring is meshed with the planetary gear, the gear ring is fixed relative to the second connecting piece, the magnetic material is fixed on the end face of the sun gear, and the coil is fixed relative to the second connecting piece. The invention can capture mechanical energy of different forms and different frequency bands of leg movement, realize the maximization of energy collection efficiency and realize gait monitoring.

Inventors

Xin Chuanfu
Xie xie
YE HAILIANG
PENG YAN
Li Herui

Assignees

上海大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The self-powered wearable gait monitoring device is characterized by comprising a first connecting piece, friction materials, an electrode pair, a second connecting piece, a planetary gear mechanism, magnetic materials and a coil, wherein the first connecting piece is used for being fixedly connected with a lower leg, the friction materials are fixedly connected with the first connecting piece, the electrode pair is fixedly connected with the second connecting piece, the second connecting piece is used for being fixedly connected with a thigh, the electrode pair is sleeved outside the friction materials and is in fit arrangement, the friction materials comprise a plurality of arc-shaped friction plates distributed in the circumferential direction, the electrode pair comprises a plurality of arc-shaped electrode plates distributed in the circumferential direction, the planetary gear mechanism comprises a gear ring, a planet wheel, a planet carrier and a sun wheel, the planet carrier is connected with the first connecting piece, the first connecting piece can drive the planet carrier to rotate, the planet wheel is rotatably arranged on the planet carrier, the sun wheel is in meshed connection with the planet wheel, the gear ring is in meshed connection with the planet wheel, and the ring gear is in fixed connection with the second connecting piece, and the coil is fixedly arranged on the end face of the magnetic materials.
2. The self-powered wearable gait monitoring device of claim 1, further comprising a housing, wherein the housing is sleeved outside the planetary gear mechanism, the magnetic material and the coil, wherein the housing is fixedly connected with the second connector, wherein the coil is fixedly connected with the housing, and wherein the gear ring is fixedly connected with the housing.
3. The self-powered wearable gait monitoring device of claim 2, wherein the planetary gear mechanism comprises a sun gear, a first planet carrier, a second planet carrier, a first planet gear, a second planet gear, a first gear ring and a second gear ring, the first planet carrier is connected with the first connecting piece, the first planet gear is rotatably arranged on the first planet carrier, the first gear ring is in meshed connection with the first planet gear, the second planet carrier is in meshed connection with the first planet gear, the second planet gear is rotatably arranged on the second planet carrier, the second gear ring is in meshed connection with the second planet gear, the sun gear is in meshed connection with the second planet gear, and the first gear ring and the second gear ring are fixedly connected to the inner wall of the shell.
4. The self-powered wearable gait monitoring device of claim 1, further comprising a one-way bearing, wherein a fixed disc is arranged on the first connecting piece, the friction material is fixedly sleeved outside the fixed disc, a connecting shaft is fixedly arranged at the center of the fixed disc, the connecting shaft is fixedly connected with an inner ring of the one-way bearing, and an outer ring of the one-way bearing is fixedly connected with the planet carrier.
5. The self-powered wearable gait monitoring device of claim 4, wherein the arc-shaped friction plates are arranged on the periphery of the fixed disk in a laminated manner and are uniformly arranged, the second connecting piece comprises a fixed ring, the arc-shaped electrode plates are arranged on the inner wall surface of the fixed ring in a laminated manner and are uniformly arranged, the number of the arc-shaped electrode plates is twice that of the arc-shaped friction plates, and each electrode pair comprises two arc-shaped electrode plates.
6. The self-powered wearable gait monitoring device of claim 5, wherein 72 arc electrode pads are provided and 36 arc friction pads are provided.
7. The self-powered wearable gait monitoring device of claim 3, wherein the first planet carrier comprises a first central shaft and three first wheel shafts, the three first wheel shafts are fixedly connected with the first central shaft, the connecting line included angle between any two first wheel shafts and the first central shaft is 60 degrees, the first planet gears are respectively rotatably arranged on the three first wheel shafts, the second planet carrier comprises a second central shaft and three second wheel shafts, the three second wheel shafts are fixedly connected with the second central shaft, the connecting line included angle between any two second wheel shafts and the second central shaft is 60 degrees, the second planet gears are respectively rotatably arranged on the three second wheel shafts, and the outer circumferential surface of the second central shaft is provided with gears which are in meshed connection with the first planet gears.
8. The self-powered wearable gait monitoring device of claim 7, wherein a first bearing is disposed between the first wheel axle and the first planet gear, the first wheel axle is fixedly connected with an inner ring of the first bearing, the first planet gear is fixedly sleeved on an outer ring of the first bearing, a second bearing is disposed between the second wheel axle and the second planet gear, the second wheel axle is fixedly connected with an inner ring of the second bearing, and the second planet gear is fixedly sleeved on an outer ring of the second bearing.
9. The self-powered wearable gait monitoring device of claim 2, wherein the magnetic material is a magnet, the magnet is provided in a plurality on an end surface of the sun gear, the coil is provided in a plurality on an inner end surface of the housing, and the number of the magnet is identical to the number of the coil.
10. The self-powered wearable gait monitoring device of claim 1, wherein the friction material is a fluorinated ethylene propylene copolymer and the electrode pair is aluminum.

Description

Self-powered wearable gait monitoring device Technical Field The invention relates to the technical field of motion monitoring, in particular to a self-powered wearable gait monitoring device. Background At present, a human body energy collecting device is mainly realized based on the working principle of a friction nano generator (TENG), but the friction nano generator mainly aims at low-frequency irregular mechanical energy movement, if the friction nano generator is arranged on a leg, high-frequency movement can exist, and the friction nano generator is difficult to realize complete energy capture aiming at the type of movement. For electromagnetic induction technology, the output voltage of an electromagnetic generator (EMG) is proportional to the rate of change of the magnetic field, but the leg movement of the human body is typically low-frequency and high-displacement movement. In order to obtain enough electric energy in low-frequency swing, strong magnets and dense coils with considerable weight and volume are adopted in design, or mechanical structures such as levers are introduced to amplify the movement speed, so that the energy harvesting device directly becomes heavy, the movement burden of a user can be obviously increased when the energy harvesting device is worn on the legs, the natural gait of the user is changed, and the comfort and the practicability are greatly reduced. Moreover, the existing human body energy collecting device lacks gait monitoring function and has single function. Therefore, a self-powered wearable gait monitoring device is needed to solve the above technical problems. Disclosure of Invention The invention aims to provide a self-powered wearable gait monitoring device, which solves the problems in the prior art, can capture mechanical energy in different forms and different frequency bands of leg movement, realizes energy collection efficiency maximization and can realize gait monitoring. In order to achieve the above object, the present invention provides the following solutions: The invention provides a self-powered wearable gait monitoring device which comprises a first connecting piece, a friction material, an electrode pair, a second connecting piece, a planetary gear mechanism, a magnetic material and a coil, wherein the first connecting piece is used for being fixedly connected with a lower leg, the friction material is fixedly connected with the first connecting piece, the electrode pair is fixedly connected with the second connecting piece, the second connecting piece is used for being fixedly connected with a thigh, the electrode pair is sleeved outside the friction material and is in fit arrangement, the friction material comprises a plurality of arc-shaped friction plates distributed in the circumferential direction, the electrode pair comprises a plurality of arc-shaped electrode plates distributed in the circumferential direction, the planetary gear mechanism comprises a gear ring, a planet wheel, a planet carrier and a sun wheel, the planet carrier is connected with the first connecting piece, the first connecting piece can drive the planet carrier to rotate, the sun wheel is meshed with the planet wheel and is meshed with the planet wheel, the gear ring gear is meshed with the planet wheel, the sun wheel is fixed relative to the second connecting piece, the planet wheel is fixed on the end face of the magnetic material, and the coil is fixed relative to the second connecting piece. In some embodiments, the planetary gear mechanism further comprises a housing, wherein the housing is sleeved outside the planetary gear mechanism, the magnetic material and the coil, the housing is fixedly connected with the second connecting piece, the coil is fixedly connected with the housing, and the gear ring is fixedly connected with the housing. In some embodiments, the planetary gear mechanism includes a sun gear, a first planet carrier, a second planet carrier, a first planet gear, a second planet gear, a first gear ring and a second gear ring, the first planet carrier is connected with the first connecting piece, the first planet gear rotates to be arranged on the first planet carrier, the first gear ring is meshed with the first planet gear to be connected, the second planet carrier is meshed with the first planet gear to be connected, the second planet gear rotates to be arranged on the second planet carrier, the second gear ring is meshed with the second planet gear to be connected, the sun gear is meshed with the second planet gear to be connected, and the first gear ring and the second gear ring are fixedly connected to the inner wall of the shell. In some embodiments, the planetary gear set further comprises a one-way bearing, a fixed disc is arranged on the first connecting piece, the friction material is fixedly sleeved outside the fixed disc, a connecting shaft is fixedly arranged at the center of the fixed disc, the connecting shaft is fixedly connected