CN220440576U - Piezoelectric-electromagnetic combined energy acquisition device - Google Patents

Abstract

The utility model relates to the technical field of energy collection, in particular to a piezoelectric-electromagnetic composite energy collection device, which comprises a polyhedral base and an energy collection structure, wherein the polyhedral base is provided with a plurality of piezoelectric-electromagnetic composite energy collection holes; one surface of the polyhedral base is connected with an external structure capable of generating vibration to drive an energy acquisition structure arranged on the polyhedral base to vibrate, so that the structure can acquire vibration energy in any direction in the environment; the vibration of the polyhedral base drives the two first cantilever beams to vibrate so as to deform the piezoelectric sheets arranged on the first cantilever beams, the connecting plate transmits the vibration of the first cantilever beams to the second cantilever beams to drive the second cantilever beams to vibrate so as to deform the piezoelectric sheets on the second cantilever beams, and therefore the mechanical energy of the piezoelectric sheets is converted into electric energy; in addition, the first magnet moves up and down along with the vibration of the second cantilever beam, the magnetic flux changes, induced electromotive force is generated in the coil, and the generated power is improved.

Description

Piezoelectric-electromagnetic combined energy acquisition device

Technical Field

The utility model relates to the technical field of energy collection, in particular to a piezoelectric-electromagnetic composite energy collection device.

Background

With the development of electronic technology, low-power consumption devices such as wireless sensors and micro-electromechanical systems are widely applied in various fields such as aerospace, military, biomedical, environmental monitoring and the like. Currently, low-power electronic devices such as wireless sensors are mostly powered by batteries. However, the disadvantages of limited battery life, periodic replacement, environmental pollution, etc. restrict the development and application thereof.

In view of the above problems, researchers have proposed an environmental energy harvesting technology, which is a technology that can harvest energy from the environment and convert it into electrical energy, and the electrical energy converted by such an energy harvesting device can be used by low-power electronics, thereby overcoming the drawbacks of conventional battery-powered devices. The environmental energy collection technology is mainly divided into five categories, namely solar energy collection, wind energy collection, heat energy collection, ocean energy collection and vibration energy collection. Compared with other energy collection technologies, the vibration energy collection technology can meet the requirements of small volume, wide application range, continuous power supply and the like, and is therefore paid attention to researchers.

Most of vibration signals in the environment are low-frequency random vibration signals, and the vibration signals are effectively collected and converted into electric energy, so that the problem that low-power-consumption electronic devices cannot be stably powered for a long time can be solved. The vibration energy collector of the piezoelectric ceramic has the characteristics of simple structure, high energy collection efficiency, green environmental protection and the like, and becomes an energy collection mode with development prospect. The traditional single-degree-of-freedom piezoelectric energy collector has high natural frequency and narrow frequency bandwidth, and generally has the problems of low collection efficiency, even incapability of reliably working and the like in practical application. In contrast, the multi-degree-of-freedom piezoelectric energy collector has wider working bandwidth, and a plurality of peaks exist in a low-frequency region, so that the energy collection efficiency of the piezoelectric energy collector is remarkably improved.

Chinese patent CN111404419a discloses a two magnet multistable piezoelectric cantilever beam energy harvester, the shape of base is concave, two left and right stands are perpendicular with the bottom surface of base, the left side stand inboard is fixed with the cantilever beam, the right side stand inboard is fixed with ring magnet, the other end of cantilever beam is fixed with rectangular magnet, near the cantilever beam root is equipped with upper and lower two-layer PZT piezoceramics for with mechanical energy conversion electric energy. The device can make the cantilever beam in a 'multi-stable state' by adjusting the distance between the two magnets, and the cantilever beam can oscillate back and forth in a plurality of steady-state potential wells. The energy collector has the defects that the energy collector is a single energy collecting mechanism, namely, energy is collected through piezoelectric ceramics, the collecting effect of the single energy collecting mechanism on environmental vibration energy is limited, and the energy collector is based on a single cantilever beam only when the energy is collected and can collect vibration energy in one direction in a space only, so that the energy collecting efficiency is low.

Disclosure of Invention

The utility model provides a piezoelectric-electromagnetic composite energy collection device, which aims to solve the problem of low energy collection efficiency caused by the fact that a single energy collection mechanism is limited in environmental energy collection effect, and only a single cantilever beam is used as a basis in energy collection and only vibration energy in one direction in a space can be collected.

A tristable piezoelectric-electromagnetic energy collection device comprises a polyhedral base and an energy collection structure;

one surface of the polyhedral base is arranged on a structure capable of generating vibration through a detachable fastener, and at least one energy acquisition structure is arranged on the other surfaces of the polyhedral base;

the energy collection structure comprises two first cantilever beams, a connecting plate, a second cantilever beam, a first mass block, a second mass block and a plurality of piezoelectric sheets which are mutually parallel; one end of each of the two first cantilever beams is connected to one face of the polyhedral base, the other ends of the two first cantilever beams are respectively connected with two ends of the connecting plate, the connecting plate is connected with the first mass block, one end of each of the second cantilever beams is connected with the connecting plate, the other end of each of the second cantilever beams is connected with the second mass block, and one piezoelectric sheet is respectively stuck to the two first cantilever beams and the two second cantilever beams and used for converting mechanical energy into electric energy.

After the structure is adopted, the piezoelectric-electromagnetic composite energy acquisition device has the following advantages: one surface of the polyhedral base is connected with an external structure capable of generating vibration, so that the polyhedral base generates vibration to drive the energy acquisition structures arranged on the surfaces of the polyhedral base to vibrate, and finally, the mechanical energy of the piezoelectric material is converted into electric energy. Compared with the prior art, only vibration energy in one direction in space can be collected, and the energy collection structure can collect vibration energy in any direction in the environment. The vibration of the polyhedral base drives the two first cantilever beams to vibrate so as to deform the piezoelectric sheets arranged on the polyhedral base, and therefore mechanical energy is converted into electric energy. Meanwhile, the other ends of the two second cantilever beams are respectively connected with two ends of the connecting plate, and the connecting plate is provided with one second cantilever beam, so that the connecting plate transmits the vibration of the first cantilever beam to the second cantilever beam to drive the second cantilever beam to vibrate, so that the piezoelectric sheet on the second cantilever beam is deformed, and mechanical energy is converted into electric energy; meanwhile, the vibration of the second cantilever beam can increase the vibration amplitude of the first cantilever beam, so that the power generation of the piezoelectric sheet on the first cantilever beam is further improved, and compared with the power acquisition of a single cantilever beam in the prior art, the structure of the piezoelectric sheet on the first cantilever beam has a better power generation effect.

As an improvement, the energy harvesting structure further comprises a cylinder, a coil, and a first magnet; the cylinder section of thick bamboo sets up on the polyhedron base, under the second cantilever beam static state, the axis of cylinder section of thick bamboo with the central line of second cantilever beam is mutually perpendicular, the coil winding is connected on the periphery wall of cylinder section of thick bamboo, first magnet with the second quality piece is connected, first magnet is located the top of coil for with the kinetic energy conversion of magnet becomes the electric energy. With this structure, the first magnet moves up and down continuously with the vibration of the second cantilever, and the magnetic flux changes at this time, so that an induced electromotive force is generated in the coil; the device can convert the mechanical energy of the piezoelectric material into electric energy and the kinetic energy of the magnet into electric energy. Compared with a single energy collecting device, the device has the advantage that the generated power is improved.

As an improvement, the energy collection structure further comprises a second magnet, a third magnet and a fourth magnet, wherein the second magnet and the third magnet are respectively arranged at two ends of the cylinder, the second magnet and the third magnet are both positioned inside the cylinder, the fourth magnet is movably connected in the cylinder, the fourth magnet is positioned in the middle of the cylinder, the two sides of the fourth magnet are respectively opposite to the magnetic poles of the second magnet and the third magnet, and the coil is wound and connected in the middle of the outer surface of the cylinder. With this structure, the fourth magnet is moved along the inner wall of the cylinder due to the vertical vibration of the first magnet and the repulsive force between the second magnet and the third magnet fixed at both ends in the cylinder and the fourth magnet in the middle, respectively, and the magnetic flux is changed at this time, so that the induced electromotive force is generated in the coil. Because the second magnet and the third magnet are repulsive force with the fourth magnet in the middle respectively, the vibration amplitude of the second cantilever beam is increased, and the power generation of the piezoelectric sheet is improved.

As an improvement, the energy collecting structure further comprises two third mass blocks, wherein the two third mass blocks are respectively connected to the free ends of the second cantilever beams, are respectively positioned at two sides of the second mass blocks, and are respectively positioned between the second mass blocks and one of the first cantilever beams. By adopting the structure, the two third mass blocks are additionally arranged at the other end of the second cantilever beam, so that the vibration amplitude of the second cantilever beam is increased, and the power generation of the piezoelectric sheet is improved.

As an improvement, the first mass block and the second cantilever beam are positioned in the middle of the connecting plate. By adopting the structure, the first mass block is arranged in the middle of the connecting plate, so that the weight of the connecting plate can be increased, the vibration amplitude of the first cantilever beam can be increased, and the power generation of the piezoelectric sheet can be improved.

As an improvement, the two first cantilever beams are perpendicular to the corresponding faces on the polyhedral base. By adopting the structure, the first cantilever beam which is vertically arranged can better maximize vibration transmission, increase the vibration amplitude of the first cantilever beam and the second cantilever beam and improve the power generation of the piezoelectric sheet.

As an improvement, one surface of the polyhedral base is provided with a structure capable of generating vibration, and the other surfaces of the polyhedral base are provided with three energy collecting structures which are parallel and equidistantly distributed at intervals. By adopting the structure, the power of the piezoelectric-electromagnetic composite energy acquisition device is improved, and the space utilization rate is improved.

As an improvement, the piezoelectric sheet is made of PZT-5A. With this structure, PZT-5A has better piezoelectric and dielectric properties, while having higher sensitivity.

Drawings

FIG. 1 is a front view of a piezoelectric-electromagnetic composite energy harvesting apparatus of the present disclosure;

FIG. 2 is an isometric view of an energy harvesting structure of the present utility model;

FIG. 3 is a schematic cross-sectional view of a cylinder of the present utility model;

fig. 4 is a schematic diagram of an embodiment of a piezoelectric-electromagnetic hybrid energy harvesting apparatus according to the present disclosure.

Wherein,

1. a polyhedral base; 2. an energy harvesting structure; 2.1, a first cantilever beam; 2.2, connecting the plates; 2.3, a second cantilever beam; 2.4, a first mass block; 2.5, a second mass block; 2.6, piezoelectric sheets; 2.7, a cylindrical barrel; 2.8, a coil; 2.9, a first magnet; 2.10, a second magnet; 2.11, a third magnet; 2.12, a fourth magnet; 2.13, a third mass block.

Detailed Description

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

The utility model provides a piezoelectric-electromagnetic composite energy collection device, which aims to solve the problem of low energy collection efficiency caused by the fact that a single energy collection mechanism has limited environmental energy collection effect, and only a single cantilever beam is used as a basis when energy is collected and only vibration energy in one direction in a space is collected in the prior art.

As shown in connection with fig. 1, the present application therefore proposes a tristable piezoelectric-electromagnetic energy harvesting device comprising a polyhedral base 1 and an energy harvesting structure 2;

one surface of the polyhedral base 1 is connected with a structure capable of generating vibration, and at least one energy acquisition structure 2 is arranged on the other surfaces of the polyhedral base 1;

the energy collection structure 2 comprises two first cantilever beams 2.1, a connecting plate 2.2, a second cantilever beam 2.3, a first mass block 2.4, a second mass block 2.5 and a plurality of piezoelectric sheets 2.6 which are parallel to each other; one end of each of the two first cantilever beams 2.1 is connected to one face of the polyhedral base 1, the other ends of the two first cantilever beams 2.1 are connected with two ends of a connecting plate 2.2 respectively, the connecting plate 2.2 is connected with a first mass block 2.4, one end of each of the second cantilever beams 2.3 is connected with the connecting plate 2.2, the other end of each of the second cantilever beams 2.3 is connected with a second mass block 2.5, and a piezoelectric sheet 2.6 is arranged on each of the two first cantilever beams 2.1 and the second cantilever beams 2.3 and used for converting mechanical energy into electric energy.

Specifically, one surface of the polyhedral base 1 is connected with a structure capable of generating vibration, so that the polyhedral base 1 generates vibration to drive the energy acquisition structures 2 arranged on each surface of the polyhedral base 1 to acquire electric energy, and compared with the prior art, the energy acquisition structures 2 can only acquire vibration energy in one direction in a space, and can acquire vibration energy in any direction in an environment to better adapt to the change of the environment; the vibration of the polyhedral base 1 drives the two second cantilever beams 2.3 to vibrate, so that the piezoelectric sheet 2.6 adhered on the second cantilever beams is deformed, and mechanical energy is converted into electric energy. Meanwhile, the other ends of the two second cantilever beams 2.3 are respectively connected with the two ends of the connecting plate 2.2, and the connecting plate 2.2 is provided with one second cantilever beam 2.3, so that the connecting plate 2.2 transmits the vibration of the first cantilever beam 2.1 to the second cantilever beam 2.3 to drive the second cantilever beam 2.3 to vibrate, so that the piezoelectric plate 2.6 on the second cantilever beam 2.3 deforms, mechanical energy is converted into electric energy, meanwhile, the vibration of the second cantilever beam 2.3 can increase the vibration amplitude of the first cantilever beam 2.1, the power generation of the piezoelectric plate 2.6 on the first cantilever beam 2.1 is further improved, and compared with the electric energy collection of a single cantilever beam in the prior art, the structure of the piezoelectric plate has a better power generation effect.

The two first cantilever beams 2.1 are respectively inserted into one of the other surfaces of the polyhedral base 1, and the insertion mode is welding, riveting or fastening piece connection, and the preferred fixing mode is fastening piece connection, so that the first cantilever beams 2.1 can be detachably connected onto any surface of the polyhedral base 1, and spare parts of the first cantilever beams 2.1 can be replaced conveniently; meanwhile, the connecting plates 2.2 are connected to the other ends of the two first cantilever beams 2.1 through welding, riveting or fastening pieces, and welding is preferred, so that the welding connection is firmer and more reliable; the second cantilever beam 2.3 is welded. The mode that riveting or fastener connect is fixed on connecting plate 2.2, and this application preferred connected mode is the fastener connection for second cantilever beam 2.3 detachable connects on connecting plate 2.2, has made things convenient for the installation and the structure replacement of second cantilever beam 2.3.

Wherein, fig. 1 schematically shows that one surface of the polyhedral base 1 is used for connecting a vibration exciter, and the vibration exciter is connected with the round hole in fig. 1 to drive the polyhedral base 1 to vibrate.

Referring to fig. 2, in a preferred embodiment of the present utility model, the energy harvesting structure 2 further comprises a cylindrical barrel 2.7, a coil 2.8, and a first magnet 2.9; the cylinder 2.7 is arranged on the polyhedral base 1, under the static state of the second cantilever beam, the axis of the cylinder 2.7 is perpendicular to the central line of the second cantilever beam 2.3, the coil 2.8 is wound and connected on the peripheral wall of the cylinder 2.7, the first magnet 2.9 is connected with the second mass block 2.5, the first magnet 2.9 is positioned above the coil 2.8, and the coil 2.8 is used for converting the kinetic energy of the magnet into electric energy.

Specifically, the first magnet 2.9 moves up and down with the vibration of the second cantilever beam 2.3, and the magnetic flux changes, thereby generating an induced electromotive force in the coil 2.8. The mechanical energy of the piezoelectric sheet and the kinetic energy of the magnet are combined to be converted into electric energy, and the output power of the piezoelectric-electromagnetic composite energy acquisition device is improved. Wherein, first magnet 2.9 passes through the fixed mode of welding, sticky or fastener and connects the other end at second cantilever beam 2.3, and this application is preferably adhesive connection, and this connected mode is relatively more convenient than other connected modes, and can not destroy first magnet 2.9 and second cantilever beam 2.3.

Referring to fig. 3, in order to further optimize the above scheme, the energy collecting structure 2 further includes a second magnet 2.10, a third magnet 2.11, and a fourth magnet 2.12, where the second magnet 2.10 and the third magnet 2.11 are disposed at two ends of the cylindrical barrel 2.7, respectively, and the second magnet 2.10 and the third magnet 2.11 are both disposed inside the cylindrical barrel 2.7, the fourth magnet 2.12 is movably connected inside the cylindrical barrel 2.7, the fourth magnet 2.12 is disposed in the middle of the cylindrical barrel 2.7, and two sides of the fourth magnet 2.12 are opposite to the magnetic poles of the second magnet 2.10 and the third magnet 2.11, respectively, and the coil 2.8 is wound and connected to the middle of the outer surface of the cylindrical barrel 2.7.

Specifically, due to the up-and-down vibration of the first magnet 2.9 and the repulsive force between the second magnet 2.10 and the third magnet 2.11 fixed at two ends in the cylindrical barrel 2.7 and the fourth magnet 2.12 in the middle, the fourth magnet 2.12 moves along the inner wall of the cylindrical barrel 2.7, and at this time, the magnetic flux changes, so that an induced electromotive force is generated in the coil 2.8, and meanwhile, due to the repulsive force between the second magnet 2.10 and the third magnet 2.11 and the fourth magnet 2.12 in the middle, the vibration amplitude of the second cantilever beam 2.3 is increased, and the power generation of the piezoelectric sheet 2.6 is improved. Wherein, second magnet 2.10 and third magnet 2.11 are fixed at the both ends of cylinder section of thick bamboo 2.7 through welding, adhesive connection or interference fit's mode, and this application preferred connected mode is the adhesive connection, and relative than other connected modes, adhesive connection convenient and fast more just can not destroy the structure of cylinder section of thick bamboo 2.7 and magnet. And the third magnet 2.11 is movably connected in the cylindrical barrel 2.7 in a clearance fit manner, so that the third magnet can move in the cylindrical barrel 2.7 along the inner wall direction of the cylindrical barrel 2.7.

In the preferred embodiment of the present utility model, as shown in fig. 2, the energy collecting structure 2 further includes two third masses 2.13, and the two third masses 2.13 are respectively connected to the other ends of the second cantilever beams 2.3, and are respectively located at two sides of the second mass 2.5, and are respectively located between the second mass 2.5 and one of the first cantilever beams 2.1.

Specifically, two third mass blocks 2.13 are additionally arranged at the other end of the second cantilever beam 2.3, so that the vibration amplitude of the second cantilever beam 2.3 is improved, and the power generation of the piezoelectric sheet 2.6 is improved. The third mass block 2.13 is connected by welding, adhesive connection, riveting or fastening, preferably welding, and the third mass block 2.13 is connected more firmly compared with other connecting modes.

In the preferred embodiment of the utility model, as shown in connection with fig. 2, the first mass 2.4 and the second cantilever beam 2.3 are located in the middle of the connection plate 2.2.

Specifically, the first mass block 2.4 is arranged in the middle of the connecting plate 2.2, so that the weight of the connecting plate 2.2 can be increased, the vibration amplitude of the first cantilever beam 2.1 is increased, and the power generation of the piezoelectric sheet 2.6 is improved.

Referring to fig. 1 and 4, in the preferred embodiment of the present utility model, two first cantilever beams 2.1 are perpendicular to corresponding faces on the polyhedral base 1.

Specifically, the first cantilever beam 2.1 which is vertically arranged can better maximize vibration transmission, so that the vibration amplitude of the first cantilever beam 2.1 and the second cantilever beam 2.3 is improved, and the power generation of the piezoelectric sheet 2.6 is improved.

In the preferred embodiment of the present utility model, as shown in fig. 4, one surface of the polyhedral base 1 is connected with a structure capable of generating vibration, and three energy collecting structures 2 are arranged on the other surfaces, and the three energy collecting structures 2 are distributed in parallel at equal intervals.

Specifically, except that one surface is connected with the structure capable of generating vibration, three energy acquisition structures 2 are arranged on other surfaces, so that the power of the piezoelectric-electromagnetic composite energy acquisition device is improved, and the space utilization rate is improved.

In a preferred embodiment of the present utility model, the piezoelectric plate 2.6 is made of PZT-5A.

Specifically, PZT-5A has better piezoelectric and dielectric properties, while having higher sensitivity.

The preferred embodiment of the present application, as shown in connection with fig. 4, is as follows:

one surface of a polyhedral base 1 (a square base is preferred in the application) is fixed on a structure capable of generating vibration, and a first cantilever beam 2.1 on one surface of two perpendicular square bases vibrates along the thickness direction of the first cantilever beam 2.1 under the external excitation effect; meanwhile, the second mass block 2.5 on the second cantilever beam 2.3 drives the second cantilever beam 2.3 to vibrate along the thickness direction of the second cantilever beam 2.3, then the piezoelectric sheets 2.6 on the first cantilever beam 2.1 and the two second cantilever beams 2.3 deform, the upper surface and the lower surface of the piezoelectric material generate equal quantity of different charges according to the positive piezoelectric effect of the piezoelectric material, the generated charges are led out through the lead wires of two poles to generate electric energy, and the conversion from mechanical energy to electric energy is realized.

Meanwhile, the vibration of the second cantilever beam 2.3 drives the first magnet 2.9 to vibrate, so that a magnetic field formed by the first magnet 2.9 and a magnetic suspension structure formed by the second magnet 2.10, the third magnet 2.11 and the fourth magnet 2.12 in the cylindrical barrel 2.7 changes, the fourth magnet 2.12 of the magnetic suspension structure moves along the inner wall of the cylindrical barrel 2.7 and the coil 2.8 wound on the outer wall of the cylindrical barrel 2.7 moves relatively, magnetic induction lines are cut in the magnetic field, induced electromotive force is generated, and conversion from mechanical energy to electric energy is realized. And the first magnet 2.9 is acted by the magnetic force of the magnetic suspension structure, so that the amplitude of the second cantilever beam 2.3 can be increased, and the generated power is improved. The third mass block 2.13 in the environment, the third mass block 2.13 is of an airfoil structure, and the airfoil structure drives the first magnet 2.9 to vibrate up and down through the connecting rod, so that the amplitude of the second cantilever beam 2.3 is further increased to improve the power generation.

According to the energy collection structure 2, the energy collection structure is inserted into the cube base according to reasonable arrangement, so that vibration energy in any direction in the environment is collected, and the generation power is improved. The problems of high natural frequency and narrow frequency bandwidth of the traditional single-degree-of-freedom piezoelectric energy collector are solved. Compared with a single degree of freedom, the two degrees of freedom formed by the first cantilever beam 2.1 and the second cantilever beam 2.3 have wider working bandwidth, and a plurality of peaks can exist in a low-frequency area generally, so that the power of the energy collecting device is remarkably improved.

The single energy collection mechanism has limited effect on the collection of the environmental vibration energy, and because the electromechanical coupling coefficients of the electromagnetic type power generation structure and the piezoelectric type power generation structure are high, and an external power supply is not needed, the application combines the two power generation modes, and the power of the energy collection device is greatly improved.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims of this application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (8)

1. The piezoelectric-electromagnetic composite energy acquisition device is characterized by comprising a polyhedral base (1) and an energy acquisition structure (2);

one surface of the polyhedral base (1) is arranged on a structure capable of generating vibration through a detachable fastener; at least one energy acquisition structure (2) is arranged on the other surfaces of the polyhedral base (1);

the energy collection structure (2) comprises two first cantilever beams (2.1) which are parallel to each other, a connecting plate (2.2), a second cantilever beam (2.3), a first mass block (2.4), a second mass block (2.5) and a plurality of piezoelectric sheets (2.6); one end of each of the two first cantilever beams (2.1) is connected to one face of the polyhedral base (1), the other ends of the two first cantilever beams (2.1) are respectively connected to two ends of the connecting plate (2.2), the connecting plate (2.2) is connected with the first mass block (2.4), one end of each of the second cantilever beams (2.3) is connected with the connecting plate (2.2), the other end of each of the second cantilever beams (2.3) is connected with the second mass block (2.5), and one piezoelectric piece (2.6) is respectively stuck to the two first cantilever beams (2.1) and the second cantilever beams (2.3) and used for converting mechanical energy into electric energy.

2. The piezo-electromagnetic hybrid energy harvesting device according to claim 1, wherein the energy harvesting structure (2) further comprises a cylindrical drum (2.7), a coil (2.8) and a first magnet (2.9); the cylindrical drum (2.7) is arranged on the polyhedral base (1), under the static state of the second cantilever beam, the axis of the cylindrical drum (2.7) is perpendicular to the central line of the second cantilever beam (2.3), the coil (2.8) is wound and connected on the peripheral wall of the cylindrical drum (2.7), the first magnet (2.9) is connected with the second mass block (2.5), the first magnet (2.9) is positioned above the coil (2.8), and the coil (2.8) is used for converting the kinetic energy of the magnet into electric energy.

3. The piezoelectric-electromagnetic composite energy harvesting device according to claim 2, wherein the energy harvesting structure (2) further comprises a second magnet (2.10), a third magnet (2.11) and a fourth magnet (2.12), the second magnet (2.10) and the third magnet (2.11) are respectively arranged at two ends of the cylindrical barrel (2.7), the second magnet (2.10) and the third magnet (2.11) are both positioned inside the cylindrical barrel (2.7), the fourth magnet (2.12) is movably connected in the cylindrical barrel (2.7), the fourth magnet (2.12) is positioned in the middle of the cylindrical barrel (2.7), two sides of the fourth magnet (2.12) are respectively opposite to the second magnet (2.10) and the third magnet (2.11), and the coil (2.8) is wound around the outer surface of the cylindrical barrel (2.7).

4. The piezo-electromagnetic hybrid energy harvesting device according to claim 1, wherein the energy harvesting structure (2) further comprises two third masses (2.13), the two third masses (2.13) being connected to the free ends of the second cantilever beams (2.3) respectively and being located on both sides of the second masses (2.5) respectively.

5. The piezo-electromagnetic hybrid energy harvesting device according to claim 1, wherein the first mass (2.4) and the second cantilever (2.3) are located in the middle of the connection plate (2.2).

6. The piezoelectric-electromagnetic hybrid energy harvesting device according to claim 1, wherein both of the first cantilever beams (2.1) are perpendicular to the corresponding faces on the polyhedral base (1).

7. The piezoelectric-electromagnetic composite energy collection device according to claim 1, wherein one surface of the polyhedral base (1) is installed on a structure capable of generating vibration, three energy collection structures (2) are arranged on other surfaces, and the three energy collection structures (2) are distributed in parallel at equal intervals.

8. The piezoelectric-electromagnetic composite energy harvesting apparatus of claim 1, wherein the piezoelectric sheet (2.6) is of PZT-5A.