Self-powered intelligent door lock based on piezoelectric ceramics

Abstract

According to the self-powered intelligent door lock based on piezoelectric ceramics, a handle rotating shaft is sleeved with a driving gear, the driving gear rotates along with rotation of a handle holding rod, and then a plurality of piezoelectric ceramic power generation pieces in a piezoelectric ceramic power generation module are driven to move relative to a fixed outer circular ring; and the piezoelectric ceramic wafer in each piezoelectric ceramic power generation sheet deforms under the action of the power generation sheet magnet and the outer ring magnet, generates electric energy and outputs the electric energy to the battery module for storage. Mechanical energy in the door lock operation process is converted into electric energy, self power supply is achieved, dependence on an external power source is reduced, the service life of a battery is prolonged, and environmental influences are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent door locks, and more specifically, relates to a self-powered intelligent door lock based on piezoelectric ceramics. Background Art

[0002] Smart door locks are the core components of modern access control security systems and are widely used in homes, offices and commercial places to improve security and convenience. These door locks usually rely on external power or built-in batteries to support remote control, biometrics and other functions. However, existing smart door locks face the problem of insufficient power supply. When the battery is exhausted, it will fail, increasing security risks, and the battery needs to be replaced frequently, increasing maintenance costs and environmental burdens. In addition, the location of installing smart door locks is limited, especially in old buildings and remote areas where it is not easy to access power, which makes maintenance costs high and implementation difficult. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a self-powered smart door lock based on piezoelectric ceramics, which can achieve self-powering by converting mechanical energy during the operation of the door lock into electrical energy, reduce dependence on external power sources, extend battery life, and reduce environmental impact.

[0004] In order to achieve the above-mentioned purpose of the invention, the self-powered intelligent door lock based on piezoelectric ceramics of the present invention includes a lock body, a shell, a handle, the handle includes a grip rod and a handle shaft, and also includes a driving gear, a piezoelectric ceramic power generation module and a battery module, wherein:

[0005] The driving gear is mounted on the handle shaft and rotates as the handle grip rotates;

[0006] The piezoelectric ceramic power generation module includes a fixed shaft, a driven gear, a generator core, N piezoelectric ceramic power generation sheets, a fixed outer ring, and M outer ring magnets, wherein:

[0007] The fixed shaft is fixed on the housing, and the driven gear is sleeved on the fixed shaft and meshed with the driving gear;

[0008] The core of the generator is a circular ring, which is sleeved on the fixed shaft and fixedly connected to the driven gear;

[0009] N piezoelectric ceramic power generation sheets are fixed on the outside of the power generation body core, and each piezoelectric ceramic power generation sheet includes a cantilever beam, a piezoelectric ceramic chip and a power generation sheet magnet, wherein the cantilever beam is fixed on the power generation body core, and the piezoelectric ceramic chip and the power generation sheet magnet are respectively mounted on the cantilever beam;

[0010] The fixed outer ring is fixed on the outer shell and has the same axis as the core of the generator, and its inner radius is greater than the distance from the outer end of the cantilever beam to the axis; M outer ring magnets are installed on the inner side of the fixed outer ring, and there is a gap between the outer ring magnets and the piezoelectric ceramic generator sheet;

[0011] The battery module is fixed on the housing, and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip in each piezoelectric ceramic generator, and the output terminal of the battery module is connected to the power supply terminal of the smart door lock;

[0012] When the handle is pressed, the driving gear is driven to rotate unidirectionally, and the N piezoelectric ceramic generators are driven to rotate through the driven gear, and move relative to the fixed outer ring. The cantilever beam in each piezoelectric ceramic generator is deformed under the action of the generator magnet and the outer ring magnet, so that the piezoelectric ceramic chip vibrates mechanically, generates electrical energy and outputs it to the battery module for storage.

[0013] The present invention is a self-powered intelligent door lock based on piezoelectric ceramics. An active gear is installed on the handle shaft, which rotates with the rotation of the handle grip, and then drives a plurality of piezoelectric ceramic power generation sheets in the piezoelectric ceramic power generation module to move relative to a fixed outer ring. The piezoelectric ceramic chip in each piezoelectric ceramic power generation sheet is deformed under the action of the power generation sheet magnet and the outer ring magnet, generating electrical energy and outputting it to the battery module for storage.

[0014] The present invention has the following beneficial effects:

[0015] 1) The present invention adopts piezoelectric ceramic technology to convert the mechanical energy during the operation of the door lock into electrical energy and store it in the battery module to supply the power required by the smart door lock, ensuring that the door lock continues to operate when there is no external power supply, reducing dependence on traditional batteries, effectively preventing the situation where the door cannot be unlocked due to exhaustion of energy storage, and reducing maintenance costs.

[0016] 2) The piezoelectric ceramic power generation module of the present invention is built into the smart door lock, and the ratchet mechanism connected to the door handle is activated by the door opening and closing action, without the need for additional operation.

[0017] 3) Compared with the prior art, the present invention enhances the continuous power supply capability, is suitable for areas without power facilities, reduces environmental pollution, and achieves both economic and ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a specific implementation of a self-powered intelligent door lock based on piezoelectric ceramics of the present invention;

[0019] Figure 2 It is a three-dimensional diagram of the self-powered intelligent door lock based on piezoelectric ceramics of the present invention;

[0020] Figure 3 is a front view of the piezoelectric ceramic power generation module of the present invention;

[0021] Figure 4 is a three-dimensional diagram of the piezoelectric ceramic power generation module of the present invention;

[0022] Figure 5 It is a structural diagram of the piezoelectric ceramic power generation sheet in the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is described below in conjunction with the accompanying drawings so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when the detailed description of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0024] Example

[0025] Figure 1 It is a structural diagram of a specific implementation of the self-powered intelligent door lock based on piezoelectric ceramics of the present invention. Figure 2 : is a three-dimensional diagram of the self-powered intelligent door lock based on piezoelectric ceramics of the present invention. In order to more clearly show the structure of the present invention, the wires are omitted in the drawings of this embodiment. Figure 1 and Figure 2 As shown, the piezoelectric ceramic self-powered smart door lock of the present invention comprises a conventional lock body 1, a housing 2, a handle 3, and the handle 3 comprises a grip 31 and a handle shaft 32. In order to achieve self-power supply, the present invention further provides a driving gear 4, a piezoelectric ceramic power generation module 5 and a battery module 6. Next, each component is described in detail.

[0026] The driving gear 4 is mounted on the handle shaft 32 and rotates with the rotation of the handle grip 31. In this embodiment, a ratchet is attached to the driving gear 4 as an active member, which together with the transmission sheet on the lock tongue in the lock body 1 forms a cam mechanism to realize the opening and closing of the door lock.

[0027] Figure 3 It is a front view of the piezoelectric ceramic power generation module of the present invention. Figure 4 : is a three-dimensional diagram of the piezoelectric ceramic power generation module of the present invention. Figure 3 and Figure 4 As shown, the piezoelectric ceramic power generation module 5 of the present invention includes a fixed shaft 51, a driven gear 52, a power generation body core 53, N piezoelectric ceramic power generation sheets 54, a fixed outer ring 55, and M outer ring magnets 56, wherein:

[0028] The fixed shaft 51 is fixed on the housing 2 , and the driven gear 52 is sleeved on the fixed shaft 51 and meshedly connected with the driving gear 4 .

[0029] The generator core 53 is a circular ring, which is sleeved on the fixed shaft 51 and fixedly connected to the driven gear 52 .

[0030] N piezoelectric ceramic power generation sheets 54 are fixed on the outside of the power generation body core 53 . Figure 5 : is a structural diagram of the piezoelectric ceramic power generation sheet in the present invention. Figure 5 As shown, each piezoelectric ceramic generator 54 includes a cantilever beam 541, a piezoelectric ceramic chip 542 and a generator magnet 543, wherein the cantilever beam 541 is fixed on the generator core 53, and the piezoelectric ceramic chip 542 and the generator magnet 543 are respectively mounted on the cantilever beam 541.

[0031] In this embodiment, N openings are provided on the generator core 53, and screws pass through the openings from the inner side of the generator core 53 and are fixedly connected to the lower end of the cantilever beam 541. The number N of piezoelectric ceramic generator sheets can be determined according to actual needs, and the preferred value range is [6,12]. In this embodiment, N=8. In order to increase the magnetic effect, the number of piezoelectric ceramic chips 542 and generator sheet magnets 543 in each piezoelectric ceramic generator sheet 54 is 2, which are respectively installed on the front and back sides of the cantilever beam 541.

[0032] The fixed outer ring 55 is fixed on the outer shell 2, and has the same axis as the core 53 of the generator, and its inner radius is greater than the distance from the outer end of the cantilever beam 541 to the axis. M outer ring magnets 56 are installed on the inner side of the fixed outer ring 55, and there is a gap between the outer ring magnets 56 and the piezoelectric ceramic generator sheet 54. It is found that the preferred value range of the number M of the outer ring magnets 56 is [2N, 3N], and M=20 in this embodiment. In terms of the fixing method, four raised circular holes are set on the outer side of the fixed outer ring 55, and screws are used to pass through the circular holes to fix the fixed outer ring 55 on the outer shell 2.

[0033] The battery module 6 is fixed on the housing 2, and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip 542 in each piezoelectric ceramic generator 54, and the output terminal of the battery module 6 is connected to the power supply end of the smart door lock.

[0034] Piezoelectric ceramics are materials with piezoelectric effect. When pressure or tensile force is applied, charge separation will occur, thereby generating a voltage difference. This phenomenon is called piezoelectric effect. By using this effect, mechanical energy can be converted into electrical energy to achieve power generation. Specifically in the present invention, when the handle grip 31 is pressed, the driving gear 4 is driven to rotate, and the N piezoelectric ceramic power generation sheets 54 are driven to rotate through the driven gear 52, and relative motion occurs with the fixed outer ring 55. The cantilever beam 541 in each piezoelectric ceramic power generation sheet 54 is deformed under the action of the power generation sheet magnet 543 and the outer ring magnet 56, so that the piezoelectric ceramic chip 542 is mechanically vibrated, generating electrical energy and outputting it to the battery module for storage.

[0035] Although the above describes the illustrative specific embodiments of the present invention to facilitate the understanding of the present invention by those skilled in the art, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

Claims

1. A self-powered intelligent door lock based on piezoelectric ceramics, comprising a lock body (1), a housing (2), and a handle (3), wherein the handle (3) comprises a grip rod (31) and a handle shaft (32), characterized in that: It also includes a driving gear (4), a piezoelectric ceramic power generation module (5) and a battery module (6), wherein: The driving gear (4) is sleeved on the handle shaft (32) and rotates along with the rotation of the handle grip (31); The piezoelectric ceramic power generation module (5) comprises a fixed shaft (51), a driven gear (52), a power generation body core (53), N piezoelectric ceramic power generation sheets (54), a fixed outer ring (55), and M outer ring magnets (56), wherein: The fixed shaft (51) is fixed on the housing (2), and the driven gear (52) is sleeved on the fixed shaft (51) and meshedly connected with the driving gear (4); The generator core (53) is a circular ring, which is sleeved on the fixed shaft (51) and fixedly connected to the driven gear (52); N piezoelectric ceramic power generation sheets (54) are fixed on the outside of the power generation body core (53), and each piezoelectric ceramic power generation sheet (54) includes a cantilever beam (541), a piezoelectric ceramic chip (542) and a power generation sheet magnet (543), wherein the cantilever beam (541) is fixed on the power generation body core (53), and the piezoelectric ceramic chip (542) and the power generation sheet magnet (543) are respectively mounted on the cantilever beam (541); The fixed outer ring (55) is fixed on the outer shell (2) and has the same axis as the core (53) of the power generator, and its inner radius is greater than the distance from the outer end of the cantilever beam (541) to the axis; M outer ring magnets (56) are installed on the inner side of the fixed outer ring (55), and there is a gap between the outer ring magnets (56) and the piezoelectric ceramic power generation sheet (54); The battery module (6) is fixed on the housing (2), and its input terminal is electrically connected to the output terminal of the piezoelectric ceramic chip (542) in each piezoelectric ceramic generator (54), and the output terminal of the battery module (6) is connected to the power supply terminal of the intelligent door lock; When the handle grip (31) is pressed, the driving gear (4) is driven to rotate unidirectionally, and the N piezoelectric ceramic power generation sheets (54) are driven to rotate through the driven gear (52), and move relative to the fixed outer ring (55). The cantilever beam (541) in each piezoelectric ceramic power generation sheet (54) is deformed under the action of the power generation sheet magnet (543) and the outer ring magnet (56), so that the piezoelectric ceramic chip (542) is mechanically vibrated, generating electrical energy and outputting it to the battery module (6) for storage.

2. The self-powered smart door lock according to claim 1, characterized in that: The driving wheel teeth (4) are supplemented with ratchets as driving parts, and together with the transmission sheet on the lock tongue in the lock body (1) form a cam mechanism.

3. The self-powered smart door lock according to claim 1, characterized in that: The generator core (53) is provided with N openings, and screws pass through the openings from the inner side of the generator core (53) and are fixedly connected to the lower end of the cantilever beam (541).

4. The self-powered smart door lock according to claim 1, characterized in that: The value range of the number N of the piezoelectric ceramic power generation sheets (54) is [6, 12].

5. The self-powered smart door lock according to claim 1, characterized in that: The number of piezoelectric ceramic chips (542) and power generation sheet magnets (543) in each piezoelectric ceramic power generation sheet (54) is two, which are respectively mounted on the front and back sides of the cantilever beam (541).

6. The self-powered smart door lock according to claim 1, characterized in that: The value range of the number M of the outer ring magnets (56) is [2N, 3N].

7. The self-powered smart door lock according to claim 1, characterized in that: Four raised circular holes are arranged on the outside of the fixed outer circular ring (55), and screws are passed through the circular holes to fix the fixed outer circular ring (55) on the outer shell (2).

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