Wrist type self-powered wearable device and vibration energy collection method thereof

Abstract

The invention relates to wrist type self-powered wearable equipment and a vibration energy collection method thereof, and belongs to the technical field of vibration energy collection and power generation. The invention discloses wrist type self-powered wearable equipment and a vibration energy collecting method thereof. The wrist type self-powered wearable equipment comprises a light shell, an electromagnetic type vibration energy collecting unit, a gear transmission unit and a piezoelectric type vibration energy collecting unit, wherein the electromagnetic type vibration energy collecting unit, the gear transmission unit and the piezoelectric type vibration energy collecting unit are installed in the light shell. The electromagnetic vibration energy acquisition unit comprises a wire, an electric brush, a shaft, a magnetic rotor and a magnetic ball mounted in a hollow pipeline of the magnetic rotor; the gear transmission unit comprises a first shaft gear, a second shaft and a third shaft which are installed on the first shaft. The piezoelectric vibration energy collection unit comprises a piezoelectric fixing piece and an offset cam. And a spring piece is arranged on the piezoelectric fixing piece. The problem of power supply endurance of the wearable device is effectively solved, the size and weight of the whole wearable device are controlled through the compact design structure, and a foundation is laid for self-power supply of the wearable device.

Description

Technical Field

[0001] The present invention relates to a wrist-type self-powered wearable device and a method for collecting vibration energy thereof, and belongs to the technical field of vibration energy collection and power generation. Background Art

[0002] With the advancement of electronic technology, the field of wearable electronic devices is also constantly developing and maturing. In wearable devices, ensuring a continuous and stable energy supply is crucial to ensuring the long-term operational stability of the device. Relevant research shows that human movement can generate a large amount of biomechanical energy. For wearable electronic devices, the vibration energy generated by human movement is considered to be one of the best power supply energy sources. The wrist is one of the most frequently active parts of the human body and has good freedom of movement. Compared with other parts of the body (such as the ankle and waist), the wrist design is more in line with the user's natural usage habits.

[0003] Traditional batteries, with their large size and limited lifespan, are not suitable for wearable electronic devices. Furthermore, when batteries are recycled and disposed of, failure to choose the right disposal methods can lead to resource waste and environmental damage. To achieve environmental sustainability and enable self-powered devices, wrist-worn self-powered wearable devices, using energy conversion technology to harness the body's mechanical energy to power wearable devices, have become a research hotspot in recent years. Summary of the Invention

[0004] The purpose of the present invention is to provide a wrist-type self-powered wearable device and a method for collecting vibration energy thereof, in order to address the problem of wearable electronic devices' dependence on batteries in the prior art.

[0005] The present invention solves the above technical problems and provides a technical solution: a wrist-type self-powered wearable device, comprising a lightweight housing and an electromagnetic vibration energy harvesting unit, a gear transmission unit, and a piezoelectric vibration energy harvesting unit installed in the lightweight housing;

[0006] The electromagnetic vibration energy harvesting unit includes a wire, a brush, a shaft, a magnetic rotor, and a magnetic ball mounted inside a hollow tube of the magnetic rotor. The magnetic rotor is fixed to the upper end of the shaft. The wire is wound around the outer ring of the hollow tube of the magnetic rotor. The lower end of the shaft is provided with two conductive rings connected to the positive and negative ends of the wires, respectively. The brush is connected to the two conductive rings.

[0007] The gear transmission unit includes a first-axis gear, a second-axis gear, and a third-axis gear installed on the first axis, the second axis is provided with a second-axis gear I and a second-axis gear II, and the third axis is provided with a third-axis gear; the first-axis gear is meshed with the second-axis gear I, the second-axis gear II is meshed with the third-axis gear, and the offset cam is connected to the piezoelectric stator;

[0008] The piezoelectric vibration energy harvesting unit includes a piezoelectric fixed plate and an offset cam, and the offset cam is installed on the three axes; a spring sheet is provided on the piezoelectric fixed plate, a roller is provided on one side of the spring sheet, and a piezoelectric film is provided on the other side, and the rotation of the offset cam drives the spring sheet to deform.

[0009] A further technical solution is that the brush comprises an upper brush elastic sheet and a lower brush elastic sheet respectively in contact with the two conductive rings, and an insulating plate is provided between the upper brush elastic sheet and the lower brush elastic sheet.

[0010] A further technical solution is that the magnetic oscillating weight is a semicircular tube, three spokes fixed to the upper end of the shaft extend from the center of the semicircular tube, one end of the semicircular tube is closed, and a oscillating weight sealing pin is installed at the other end; the wire is wound around the outer ring of the semicircular tube.

[0011] A further technical solution is that an insulating ring is provided between the conductive ring and a shaft.

[0012] A further technical solution is that the second-shaft gear I and the second-shaft gear II are installed on the two shafts through a second-shaft gear fixing pin and a second-shaft gear fixing sleeve.

[0013] A further technical solution is that the three-axis gears and the offset cam are installed on the three axes through copper sleeves.

[0014] A further technical solution is that the roller is fixed to the inner side of the spring sheet through a roller bracket.

[0015] A further technical solution is that the piezoelectric film and the spring sheet are bonded together by conductive adhesive.

[0016] A further technical solution is that a pulse meter, a hygrometer and an electronic watch are arranged in the lightweight shell.

[0017] A method for collecting vibration energy, comprising:

[0018] When the wearer exercises, the entire energy harvester is vibrated, causing the overall structure to deflect. The magnetic rotor begins to rotate around its own axis due to its own gravity and the gravity of the magnetic ball. The magnetic ball also rolls inside the pipe, moving relative to the wire coil wrapped around the pipe's outer ring, cutting through the magnetic lines of force and generating alternating current.

[0019] At the same time, the magnetic rotor rotates under external stimulation, transmitting its torque to the first shaft, which in turn transmits the torque to the first shaft gear. The torque is then transmitted to the second shaft through the meshing relationship between the first shaft gear and the second shaft gear I. The second shaft gear II externally meshes with the third shaft gear, and the torque is transmitted to the third shaft through this meshing relationship. Then, it is transmitted to the third shaft through the third shaft to the third shaft of the offset cam. The third shaft of the offset cam transmits motion to the roller fixed to the spring leaf through line contact, converting the rotational motion of the magnetic rotor into linear reciprocating motion of the spring leaf. When the spring leaf undergoes elastic deformation, the positive piezoelectric effect of the piezoelectric film is triggered, generating alternating current.

[0020] The generated alternating current passes through the energy storage circuit and is converted into pulsating direct current by a full-wave rectifier. It is then stabilized at the reverse breakdown voltage of the Zener diode after passing through a filter capacitor and a Zener diode, and is charged into a battery for storage, completing the energy collection of the electromagnetic collection unit.

[0021] The present invention has the following beneficial effects: The solution of the present application utilizes an offset cam, a cylindrical gear and two energy conversion excitations to achieve an effective combination of piezoelectric power generation and electromagnetic power generation, and cleverly integrates the frequency increasing mechanism and the offset cam therein, thereby realizing the conversion of motion forms and the collection and storage of energy generated during human wrist movement, effectively solving the power supply and endurance problems of wearable devices, and the compact design structure controls the volume and weight of the entire wearable device, laying the foundation for realizing self-powering of wearable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram (axonometric view) of the wrist-type self-powered wearable device provided by an embodiment of the present invention after the outer shell, top panel and instruments fixed thereon are removed;

[0023] Figure 2 1 is a schematic diagram of the overall structure of a wrist-type self-powered wearable device provided by an embodiment of the present invention (axonometric view);

[0024] Figure 3 1 is a structural schematic diagram (front view) of a shaft assembly unit provided by an embodiment of the present invention;

[0025] Figure 4 1 is a structural schematic diagram (axonometric diagram) of a two-axis assembly unit provided in an embodiment of the present invention;

[0026] Figure 5 1 is a structural schematic diagram (axonometric diagram) of a three-axis assembly unit provided in an embodiment of the present invention;

[0027] Figure 6 1 is a schematic structural diagram (axonometric diagram) of a piezoelectric vibration energy harvesting unit provided in an embodiment of the present invention;

[0028] Figure 71 is a schematic diagram of the rotational motion of the magnetic oscillating weight provided by an embodiment of the present invention (front view);

[0029] Figure 8 1 is a schematic structural diagram (axonometric view) of a gear transmission unit provided in an embodiment of the present invention;

[0030] Figure 9 It is a structural diagram of the energy storage unit provided in an embodiment of the present invention.

[0031] As shown in the figure: 1-wire; 2-magnetic rotor; 3-magnetic ball; 4-rotor sealing pin; 5-insulating ring; 6-conductive ring; 7-brush; 8-first axis; 9-first axis gear; 10-second axis; 11-second axis gear I; 12-second axis gear II; 13-two-link gear fixing sleeve; 14-two-link gear fixing pin; 15-third axis; 16-three-axis gear; 17-offset cam; 18-copper sleeve; 19-roller; 20-roller bracket; 21-spring sheet; 22-piezoelectric film; 23-top panel; 24-pulse meter; 25-humidity meter; 26-electronic meter; 27-lightweight housing; 28-piezoelectric fixing plate; 29-full-wave rectifier; 30-filter capacitor; 31-voltage-stabilizing resistor; 32-voltage-stabilizing diode; 33-battery. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] like Figures 1-8 As shown, the wrist-type self-powered wearable device of the present invention includes a lightweight housing 27 and an electromagnetic vibration energy harvesting unit, a gear transmission unit, and a piezoelectric vibration energy harvesting unit installed in the lightweight housing 27;

[0034] The electromagnetic vibration energy harvesting unit comprises a conductor 1, a brush 7, a shaft 8, a magnetic rotor 2, and a magnetic ball 3 mounted within a hollow tube of the magnetic rotor 2. The magnetic rotor 2 is fixed to the upper end of the shaft 8. The conductor 1 is wound around the outer ring of the hollow tube of the magnetic rotor 2. Two conductive rings 6, connected to the positive and negative ends of the conductor 1, are provided at the lower end of the shaft 8. The brush 7 is connected to the two conductive rings 6.

[0035] The gear transmission unit includes a first-shaft gear 9, a second-shaft gear 10, and a third-shaft gear 15 mounted on the first shaft 8. The second-shaft gear 10 is provided with a second-shaft gear I 11 and a second-shaft gear II 12, and the third-shaft gear 16 is provided on the third shaft 15. The first-shaft gear 9 meshes with the second-shaft gear I 11, and the second-shaft gear II 12 meshes with the third-shaft gear 16. The offset cam 17 is connected to the piezoelectric stator 28.

[0036] The piezoelectric vibration energy harvesting unit includes a piezoelectric stator 28 and an offset cam 17, and the offset cam 17 is mounted on the three-axis 15; a spring sheet 21 is provided on the piezoelectric stator 28, and a roller 19 is provided on one side of the spring sheet 21 and a piezoelectric film 22 is provided on the other side. The rotation of the offset cam 17 drives the spring sheet 21 to deform, triggering the positive piezoelectric effect of the piezoelectric film 22 to generate alternating current.

[0037] The offset cam 17 has an outer diameter of 11 mm, a base diameter of 4 mm, and an eccentricity of 2 mm. The offset cam 17 converts the rotation of the three-axis gear 16 into vibration of the spring 21 through a fixed eccentricity and rollers 19 fixed to either side of the spring. The near-rest distance is designed to prevent the spring from deforming. When the cam rotates and the rollers leave the near-rest position, the spring deforms, with a maximum deformation of 4 mm.

[0038] The working principle of this embodiment is as follows: First, the electromagnetic vibration energy harvesting unit generates electrical energy; the magnetic ball 3 will be displaced under external vibration excitation, and will move relative to the wire 1 wrapped around the outer ring of the magnetic pendulum 2 pipe, cutting the magnetic flux lines and generating electrical energy;

[0039] Secondly, the piezoelectric vibration energy collection unit generates electrical energy; the magnetic rotor 2 rotates under external excitation, and its torque is transmitted to the offset cam 17 through the gear transmission unit; the relative motion between the roller 19 and the offset cam 17 is pure rolling, and the near-rest distance of the offset cam 17 is designed to be a non-deformed position of the spring leaf 21. When the offset cam 17 rotates and the roller 19 leaves the near-rest position, the spring leaf 21 deforms, and at the same time drives the piezoelectric film 22 attached thereto to bend, generating an electromotive force in the polarization direction through the positive piezoelectric effect, thereby generating electricity.

[0040] The gear transmission unit's primary function is to increase the rotational speed, speed up the frequency of extruding the piezoelectric material, improve the efficiency of energy collection, and make the collected energy more stable. The overall transmission ratio of the gear transmission unit is 1.78. The module of each of the four gears is 0.7. The number of teeth on the first axis gear 9 is 16, the number of teeth on the second axis gear I 11 is 12, the number of teeth on the second axis gear II 12 is 16, and the number of teeth on the third axis gear 16 is 12. The gears are all 15 mm thick, and the pressure angle is 20°.

[0041] The piezoelectric vibration energy harvesting unit is installed in the magnetic rotor 2, effectively improving the space utilization of the wrist-worn self-powered wearable device. It also organically combines electromagnetic and piezoelectric energy harvesting devices. The electromagnetic rotor serves as the input for the piezoelectric harvesting device, and through a gear transmission mechanism, it amplifies the low-frequency vibrations generated by human movement, significantly improving the efficiency of vibration energy harvesting in a small space.

[0042] The lightweight housing 27 houses a panel assembly consisting of a top panel 23 and a microelectronics bay secured to it, housing various low-power microelectronic devices (pulse meter 24, hygrometer 25, and electronic meter 26). This modular design allows for the insertion of various microelectronic devices into the bay, depending on the needs. Slots on either side of the bay secure the devices.

[0043] In this embodiment, the top panel 23 is made of polycarbonate (PC). The magnetic rotor 2 is made of 304 stainless steel. The magnetic ball 3 is made of a neodymium iron boron permanent magnet. The gears are made of Q235 carbon steel. The shafts are made of 45 steel.

[0044] Please see the attached Figure 9 The wrist-type self-powered wearable device disclosed in the present invention also includes an energy storage unit installed on a lightweight housing 27, and the energy storage unit includes a full-wave rectifier 29, one end of the full-wave rectifier 29 is two input ends, and the other end is a positive output end and a negative output end; a filter capacitor 30 is connected in parallel to the output end, which is used to smooth the rectified DC voltage and reduce pulsating ripples; a voltage-stabilizing resistor 31 is connected in series to the positive output end of the full-wave rectifier 29, which is used to limit current or divide voltage; a voltage-stabilizing diode 32 is connected in parallel to the voltage-stabilizing resistor 31 to achieve a more stable voltage output; the positive output end and the negative output end are respectively connected to the positive and negative poles of a battery 33 for energy storage.

[0045] After the electric energy generated by the electromagnetic unit and the piezoelectric unit is rectified, filtered and stabilized, it is stored in the energy storage unit. When the exercise intensity is high and the power supply is in excess, the energy storage unit can store electric energy. During daily use, the generated electric energy can meet the demand, thereby ensuring the normal use of the equipment and the storage of electricity.

[0046] The electric energy collected by the present invention is charged into a battery after passing through circuit designs such as a rectifier circuit, a filter circuit, and a voltage stabilizing circuit, and the battery supplies energy to various electronic devices in the load unit.

[0047] To facilitate understanding of the above embodiment, this embodiment provides an exemplary description, including:

[0048] The piezoelectric effect can be described by the piezoelectric constitutive equation:

[0049]

[0050] Where: σ and δ are the strain vector and stress vector; E and D are the electric field vector and electric displacement vector, respectively; s is the elastic coefficient under constant electric field, ε is the dielectric constant under constant stress, d is the forward and inverse piezoelectric effect constant force matrix, the superscript t represents the transpose; the superscripts E and T represent constants under constant electric field and constant stress.

[0051] Magnetic rotor 2 begins to rotate around its own axis due to its own weight and the weight of magnetic ball 3. The magnetic ball simultaneously rolls inside the pipe, moving relative to the coils wrapped around the pipe's outer ring. This cuts through the magnetic flux lines, generating an alternating current. This current flows through the energy storage circuit, storing the energy collected by the electromagnetic unit in the battery. It should be noted that the induced electromotive force can be expressed by the following formula:

[0052]

[0053] Where: E is the induced electromotive force generated by cutting the magnetic flux lines, N is the number of coil turns, is the flux change, and Δt is the flux change time.

[0054] The outer ring radius of the magnetic rotor 2 is 17mm. Based on the design model size, the total number of coil turns N = 30. For economic and applicability reasons, copper wire is used. The conductivity of copper is 0.0172μm, and the wire diameter is 0.8mm. The maximum and minimum magnetic flux of the magnetic ball are shown in the formula:

[0055]

[0056] The one-way electromotive force is shown as follows:

[0057]

[0058] Where: E is the electromotive force, N is the number of turns of the coil, is the change in magnetic flux, and Δt is the one-way motion time of the magnetic ball.

[0059] The one-way electrical energy is shown as follows:

[0060]

[0061] Where: W is the electric power, E is the electromotive force, and R is the wire resistance.

[0062] The magnetic ball 3 undergoes one periodic motion in the magnetic rotor 2, and the magnetic flux undergoes four changes. Therefore, the electromagnetic energy harvesting part generates about 1.77 J of electrical energy per second.

[0063] The NdFeB permanent magnet balls in the magnetic rotor 2 also have the effect of accelerating the movement, and can increase the rotation speed of the magnetic rotor through inertia, thereby improving the efficiency of electromagnetic energy collection.

[0064] In this embodiment, the brush 7 includes an upper brush elastic sheet and a lower brush elastic sheet respectively in contact with the two conductive rings 6, and an insulating plate is provided between the upper brush elastic sheet and the lower brush elastic sheet; the two brush elastic sheets are respectively in contact with the positive and negative conductive rings, and then the wiring clips transfer the electrical energy to the next link.

[0065] like Figure 1 As shown, in this embodiment, the magnetic oscillating weight 2 is a semicircular tube with an outer diameter of 5 mm and an inner diameter of 4 mm. Three spokes fixed to the upper end of the shaft 8 extend from the center of the semicircular tube, and the angle between each spoke is 90°. One end of the semicircular tube is closed, and the other end is equipped with an oscillating weight sealing pin 4 to prevent the magnetic ball 3 from falling. The wire 1 is wound around the outer ring of the semicircular tube.

[0066] In this embodiment, an insulating ring 5 is provided between the conductive ring 6 and the shaft 8. Specifically, a hole is drilled in the center of the shaft 8, and the ends of the coil are passed through the small hole in the center of the main shaft. Two grooves are formed at the lower end, and holes are opened in the grooves to lead out the wires. The guide groove is first separated from the conductive ring 6 and the metal main shaft by a layer of insulating ring 5 to prevent leakage. A conductive ring 6 is then added on top of the insulating ring 5 and connected to the wire 1.

[0067] like Figure 4 and 5 As shown, in this embodiment, two-shaft gear I 11 and two-shaft gear II 12 are connected by a two-shaft gear fixing sleeve 13, which is fixed with a two-shaft gear fixing pin 14, preventing relative motion between the two gears, thus achieving the effect of a double gear. Three-shaft gear 16 transmits motion through external engagement with two-shaft gear II 12. Three-shaft gear 16 is connected to three-shaft 15 via a copper sleeve 18. The three-shaft gear 16 and copper sleeve 18 have an interference fit, while the three-shaft 15 and copper sleeve 18 have a clearance fit. The connection of copper sleeve 18 transmits motion to the three-shaft 15. An offset cam 17 and copper sleeve 18 have an interference fit, transmitting motion to the offset cam 17 through the connection of the copper sleeve.

[0068] like Figure 6 As shown, in this embodiment, two opposing spring plates 21 are provided at each end of the piezoelectric stator 28. The roller 19 is fixed to the inner upper end of the spring plate 21 via a roller bracket 20. The piezoelectric film 22 and the spring plate 21 are bonded together with conductive adhesive. The two piezoelectric films move in opposite directions. When one piezoelectric film is at its maximum deformation, the other is in its initial, undeformed position. In other words, the alternating currents generated by the positive piezoelectric effect are 180° out of phase. The piezoelectric harvesting unit collects vibration energy through the circuit.

[0069] The spring sheet 21 is made of Al3003, and the piezoelectric film 22 is made of PVDF. The spring sheet 21 is fixed to the piezoelectric fixing sheet 28 by screws.

[0070] A method for collecting vibration energy, comprising:

[0071] When the wearer exercises, the entire energy harvester is vibrated and the overall structure deflects. The magnetic rotor 2 begins to rotate around its own axis due to its own gravity and the gravity of the magnetic ball 3. The magnetic ball 3 also rolls inside the pipe, moving relative to the wire coil wrapped around the pipe's outer ring, cutting the magnetic lines of induction and generating alternating current.

[0072] At the same time, magnetic rotor 2 rotates under external excitation, transmitting torque to shaft 1 8 . Shaft 8 in turn transmits torque to shaft 1 gear 9 . This torque is then transmitted to shaft 2 10 through the meshing relationship between shaft 1 gear 9 and shaft 2 gear I 11 . Shaft 2 gear II 12 meshes externally with shaft 3 gear 16 , transmitting torque to shaft 3 15 . From there, it is transmitted to offset cam shaft 17 . This offset cam shaft 17 transmits motion through line contact with roller 19 fixed to spring leaf 21 . This converts the rotational motion of magnetic rotor 2 into linear reciprocating motion of spring leaf 21 . When spring leaf 21 undergoes elastic deformation, the piezoelectric film 22 generates alternating current (AC). The piezoelectric film is fixed to the spring leaf with conductive adhesive. When the spring leaf undergoes elastic deformation, this triggers the piezoelectric effect of the piezoelectric film, generating AC. The two piezoelectric films move in opposite directions: when one is at its maximum deformation, the other is in its initial, undeformed position. That is, the alternating currents generated by the positive piezoelectric effect have a phase difference of 180 degrees. The vibration energy collection of the piezoelectric collection unit is completed through the circuit;

[0073] The generated alternating current passes through the energy storage circuit and is converted into pulsating direct current by a full-wave rectifier. It is then stabilized at the reverse breakdown voltage of the Zener diode after passing through a filter capacitor and a Zener diode, and is charged into a battery for storage, completing the energy collection of the electromagnetic collection unit.

[0074] In practical applications, this device is incorporated into a wearable device. When the human wrist moves, such as when walking, swinging the arm, or exercising, the device tilts, triggering a generator that generates electricity through piezoelectric and electromagnetic energy harvesting. This continuously powers the built-in pulse meter, hygrometer, and electronic meter modules, achieving self-powered operation. This invention significantly reduces the device's reliance on batteries. Its compact size and efficient energy utilization offer an effective solution for the design of future miniaturized, low-power devices.

[0075] The above description does not limit the present invention in any form. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can use the technical content disclosed above to make some changes or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A wrist-type self-powered wearable device, characterized in that: It comprises a lightweight housing (27) and an electromagnetic vibration energy collection unit, a gear transmission unit, and a piezoelectric vibration energy collection unit installed in the lightweight housing (27); The electromagnetic vibration energy harvesting unit comprises a wire (1), a brush (7), a shaft (8), a magnetic rotor (2), and a magnetic ball (3) installed inside a hollow tube of the magnetic rotor (2); the magnetic rotor (2) is fixed to the upper end of the shaft (8); the wire (1) is wound around the outer ring of the hollow tube of the magnetic rotor (2); the lower end of the shaft (8) is provided with two conductive rings (6) respectively connected to the positive and negative ends of the wire (1), and the brush (7) is connected to the two conductive rings (6); The gear transmission unit comprises a first-axis gear (9), a second-axis gear (10), and a third-axis gear (15) mounted on the first-axis gear (8); the second-axis gear (10) is provided with a second-axis gear I (11) and a second-axis gear II (12); and the third-axis gear (16) is provided on the third-axis gear (15); the first-axis gear (9) is meshed with the second-axis gear I (11), the second-axis gear II (12) is meshed with the third-axis gear (16), and the offset cam (17) is connected to the piezoelectric stator (28); The piezoelectric vibration energy collection unit comprises a piezoelectric fixed plate (28) and an offset cam (17), wherein the offset cam (17) is mounted on the three shafts (15); a spring plate (21) is provided on the piezoelectric fixed plate (28), a roller (19) is provided on one side of the spring plate (21), and a piezoelectric film (22) is provided on the other side; the offset cam (17) rotates to drive the spring plate (21) to deform.

2. The wrist-type self-powered wearable device according to claim 1, characterized in that: The brush (7) comprises an upper brush elastic sheet and a lower brush elastic sheet respectively in contact with two conductive rings (6), and an insulating plate is provided between the upper brush elastic sheet and the lower brush elastic sheet.

3. The wrist-type self-powered wearable device according to claim 1, characterized in that: The magnetic oscillating weight (2) is a semicircular tube, and three spokes fixed to the upper end of the shaft (8) extend from the center of the semicircular tube. One end of the semicircular tube is closed, and a oscillating weight sealing pin (4) is installed at the other end. The wire (1) is wound around the outer ring of the semicircular tube.

4. The wrist-type self-powered wearable device according to claim 1, characterized in that: An insulating ring (5) is provided between the conductive ring (6) and a shaft (8).

5. The wrist-type self-powered wearable device according to claim 1, characterized in that: The two-shaft gear I (11) and the two-shaft gear II (12) are mounted on the two shafts (10) via a two-shaft gear fixing pin (14) and a two-shaft gear fixing sleeve (13).

6. The wrist-type self-powered wearable device according to claim 1, characterized in that: The three-axis gear (16) and the offset cam (17) are installed on the three-axis (15) through a copper sleeve (18).

7. The wrist-type self-powered wearable device according to claim 1, characterized in that: The roller (19) is fixed on the inner side of the spring sheet (21) via a roller bracket (20).

8. The wrist-type self-powered wearable device according to claim 1, characterized in that: The piezoelectric film (22) and the spring sheet (21) are bonded together by conductive adhesive.

9. The wrist-type self-powered wearable device according to claim 1, characterized in that: The light shell (27) is provided with a pulse meter (24), a humidity meter (25) and an electronic meter (26).

10. A vibration energy collection method, applied to the wrist-type self-powered wearable device according to any one of claims 1 to 9, characterized in that: include: After wearing the device, when a person moves, the entire energy harvester is stimulated by vibration, the entire structure deflects, and the magnetic rotor (2) begins to rotate around its own axis due to its own gravity and the gravity of the magnetic ball (3); the magnetic ball (3) rolls inside the pipe, and moves relative to the conductive wire wound around the outer ring of the pipe, cutting the magnetic flux lines to generate alternating current; At the same time, the magnetic oscillating weight (2) is rotated by external excitation, and its torque is transmitted to the first shaft (8), and the first shaft (8) transmits the torque to the first shaft gear (9), and the torque is transmitted to the second shaft (10) through the meshing relationship between the first shaft gear (9) and the second shaft gear I (11); the second shaft gear II (12) is externally meshed with the third shaft gear (16), and the torque is transmitted to the third shaft (15) through the meshing relationship, and then transmitted to the offset cam third shaft (17) through the third shaft (15), and the offset cam third shaft (17) and the roller (19) fixed on the spring sheet (21) transmit motion through line contact; the rotational motion of the magnetic oscillating weight (2) is converted into the linear reciprocating motion of the spring sheet (21); when the spring sheet (21) undergoes elastic deformation, the positive piezoelectric effect of the piezoelectric film (22) is triggered, thereby generating alternating current; The generated alternating current passes through the energy storage circuit and is converted into pulsating direct current by a full-wave rectifier. It is then stabilized at the reverse breakdown voltage of the Zener diode after passing through a filter capacitor and a Zener diode, and is charged into a battery for storage, completing the energy collection of the electromagnetic collection unit.

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