Sidewalk warning device based on piezoelectric ceramics

Abstract

A sidewalk warning device based on piezoelectric ceramics comprises a brick box and a brick box cover arranged on the brick box in a covering mode, the brick box and the brick box cover form a brick body, a cavity used for arranging a piezoelectric ceramic plate is formed in the brick box, the current output end of the piezoelectric ceramic plate is connected with a capacitor, and the current output end of the piezoelectric ceramic plate is connected with the capacitor. And the output end of the capacitor is connected with a vibration motor which is used for generating high-frequency vibration to carry out vibration feedback on feet of pedestrians. According to the sidewalk warning device based on the piezoelectric ceramics, the warning effect is improved, the power generation efficiency is high, and the requirement for self power utilization is effectively met.

Description

Technical Field

[0001] The invention belongs to the technical field of warning devices and relates to a sidewalk warning device based on piezoelectric ceramics. Background Art

[0002] Chinese patent publication number (CN106655888B) discloses a detachable oscillating deceleration warning device based on piezoelectric power generation. The oscillating deceleration warning device is designed as an assembled modular structure. A baseplate is fixed to the road surface. Oscillating modules are arranged in rows and columns on the baseplate, with spaces between adjacent rows and columns. Each oscillating module is independently mounted on the baseplate using baseplate screws to form a detachable oscillating deceleration warning device. Piezoelectric generators are installed within the oscillating modules to form a power generation oscillation module. The compression deformation of the power generation oscillation module drives the deformation of the piezoelectric generators, thereby generating electrical energy. A reflective layer is provided on the surface of the oscillating deceleration warning device. This invention fully utilizes idle road energy to generate relatively stable electrical energy. The device can be disassembled individually or as a whole without damaging the original road surface structure, facilitating construction and maintenance. However, according to the principles and properties of piezoelectric materials, applying pressure to a piezoelectric material generates a potential difference (known as the direct piezoelectric effect), while applying a voltage generates mechanical stress (known as the inverse piezoelectric effect). If the pressure is a high-frequency vibration, a high-frequency current is generated. When a high-frequency electrical signal is applied to the piezoelectric ceramic, a high-frequency sound signal (mechanical vibration) is generated, which is what we usually call an ultrasonic signal. However, when a vehicle passes by, it is a one-time crushing. Its principle is the same as the piezoelectric device in a lighter. Due to the high pressure of the knocking, it will generate a very high voltage but the current is very small, so it is difficult to play a good charging and storage role. Frequent high-voltage impacts will cause other electrical equipment to malfunction. In addition, its design structure is complex and the failure rate is high. It is not suitable for use in important scenes such as roads that require high stability.

[0003] Existing pedestrian blind paths use raised stripes on their surfaces to help users determine road direction through tactile sensation. However, this structure often leads to disorientation and is ineffective. Others have proposed using sound reminders, such as the Chinese patent application CN111794141A, which discloses a blind path indicator tile. This sound reminder is ineffective, has low power generation efficiency, and typically requires an external power source (such as a battery), making it less practical. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides a pedestrian warning device based on piezoelectric ceramics, which improves the warning effect and has high power generation efficiency to effectively meet its own electricity needs.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A piezoelectric ceramic-based pedestrian warning device includes a brick box and a brick box cover mounted on the brick box. The brick box and the brick box cover form a brick body. A cavity for arranging a piezoelectric ceramic plate is provided within the brick box. The current output end of the piezoelectric ceramic plate is connected to a capacitor, and the output end of the capacitor is connected to a vibration motor for generating high-frequency vibration to provide vibration feedback to pedestrians' feet.

[0007] Furthermore, a spring component is provided in the brick box, and a pressure plate for knocking the piezoelectric ceramic plate is provided at the end of the spring component. A magnetic trigger device is also provided in the brick box for deforming the spring so that it accumulates elastic potential energy and then triggers it to knock the piezoelectric ceramic plate.

[0008] Furthermore, a fixed arm is fixed in the brick box, a spring plate is inserted into the side of the fixed arm, and the middle part of the pressure plate is fixed to the end of the spring plate. When the magnetic trigger device magnetically attracts the pressure plate, the spring plate is deformed. After the magnetic attraction is released, the pressure plate quickly and repeatedly strikes the piezoelectric ceramic plate under the action of elastic potential energy.

[0009] Furthermore, the magnetic triggering device includes a hinged shaft rotatably disposed within the brick box, a foot lever fixed to the hinged shaft, a neodymium magnet fixed to the front end of the foot lever for magnetically attracting the pressure plate, a rubber foot pedal fixed to the other end of the foot lever, and a limit disconnection crossbar fixed within the brick box for limiting the deformation of the spring plate. Of course, other triggering structures can also be used.

[0010] Preferably, a spring for lifting the brick box cover is provided in the brick box. Under the gravity of the rubidium magnet, when no one steps on the brick box cover, the rubidium magnet descends and resets to be magnetically attracted to the pressure plate.

[0011] A plurality of downwardly protruding blocks are arranged at intervals in a rectangular array on the lower end surface of the pressing plate.

[0012] A plurality of stacked piezoelectric ceramic plates are arranged in the brick box, and the piezoelectric ceramic plates are connected in series.

[0013] More preferably, a multi-layer serial piezoelectric module is arranged in the brick box, and the multi-layer serial piezoelectric module includes a plurality of piezoelectric ceramic plates and spacer plates for separating the piezoelectric ceramic plates, and a multi-layer serial piezoelectric module integrated box that encapsulates the piezoelectric ceramic plates and the spacer plates.

[0014] Staggered stacking blocks are spaced apart on the upper and lower end surfaces of the spacer plate. The blocks are staggered on the upper and lower surfaces of the spacer plate, and their arrangement is offset from the bumps on the lower end surface of the pressure plate. This design creates alternating deformation pressures on the upper and lower surfaces of the piezoelectric ceramic plate under mechanical pressure, effectively utilizing the charge of the entire piezoelectric ceramic plate.

[0015] The technical concept of the present invention is as follows: first, utilizing the principle that piezoelectric ceramic plates generate continuous current when subjected to high-frequency vibrations, a trigger-type spring structure is used to cause high-frequency tapping of the piezoelectric ceramics within a certain range through elastic potential energy, so that the piezoelectric ceramics can generate a relatively continuous and stable current to charge the capacitor; further, in order to maximize the utilization of mechanical energy, an innovative stacking technology is used to allow mechanical pressure to act crosswise on the multi-layer piezoelectric ceramic plates through the bumps designed with a checkerboard pattern, and multiple piezoelectric ceramic plates are electrically connected to the capacitor in series, thereby increasing the current to quickly charge the capacitor. When the capacitor is fully charged, it drives the vibration motor to operate and lasts for at least several seconds.

[0016] When a person steps on the brick box cover, the spring plate is pulled up by magnetic attraction and then disengaged from the magnetic attraction under the action of the limit disconnect cross bar, and quickly knocks on the multi-layer series piezoelectric module to generate current to charge the capacitor and thus trigger the vibration motor to work. The brick box cover will generate very obvious vibration feedback to the pedestrian to confirm its direction. The structural design of this device is ingenious and novel, with good stability and suitable for paving roads. It has good cost control and is suitable for promotion. Its modular design of square packaging is convenient for on-demand paving according to needs, which is simple and efficient.

[0017] The beneficial effects of the present invention are mainly manifested in: 1. improving the warning effect, with high power generation efficiency to effectively meet its own electricity needs; 2. having good stability and being suitable for paving roads, with good cost control and suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a pedestrian warning device based on piezoelectric ceramics;

[0019] Figure 2 This is a schematic diagram of the structure of a piezoelectric ceramic-based pedestrian warning device from another angle;

[0020] Figure 3 This is a schematic diagram of the internal principle structure of a pedestrian warning device based on piezoelectric ceramics;

[0021] Figure 4 yes Figure 1 Schematic diagram of the exploded structure of the packaging structure in the multi-layer series piezoelectric module integrated box 26.

[0022] The markings in the accompanying drawings are as follows: 10, piezoelectric ceramic plate; 11, spacer plate; 12, offset stacking block; 13, multi-layer series piezoelectric module; 14, brick box cover; 15, brick box; 16, anti-slip bump; 17, overtravel groove; 18, limit disconnect cross bar; 19, hinge shaft; 20, rubber foot pedal; 21, capacitor; 22, vibration motor; 23, spring plate; 24, rubidium magnet; 25, pressure plate; 26, multi-layer series piezoelectric module integrated box; 27, foot lever; 28, fixed arm. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Reference Figures 1 to 4 A piezoelectric ceramic-based pedestrian warning device includes a brick box 15 and a brick box cover 14 mounted on the brick box 15. The brick box 15 and the brick box cover 14 form a brick body for easy installation on the road. A cavity is provided in the brick box 15 for arranging a piezoelectric ceramic plate 10. The piezoelectric ceramic plate 10 is used to generate current when pressurized to charge a capacitor 21. After the capacitor 21 is charged, it is used to trigger and start the vibration motor 22 and generate high-frequency vibrations through the vibration motor 22 arranged in the brick box 15 to provide vibration feedback to the pedestrian's feet.

[0025] A spring component is also provided in the brick box 15, and a pressure plate 25 for striking the piezoelectric ceramic plate 10 is provided at the end of the spring component. In addition, a magnetic trigger device is provided for deforming the spring to accumulate elastic potential energy and then trigger the spring to strike the piezoelectric ceramic plate 10.

[0026] Furthermore, a fixed arm 28 is fixed in the brick box 15, and a spring plate 23 is inserted on the side of the fixed arm 28. The middle part of the pressure plate 25 is fixed to the end of the spring plate 23. When the magnetic trigger device magnetically attracts the pressure plate 25, the spring plate 23 is deformed. After the magnetic attraction is released, the pressure plate 25 quickly and repeatedly strikes the piezoelectric ceramic plate 10 under the action of elastic potential energy.

[0027] In one embodiment, the magnetic trigger device includes a hinge shaft 19 that is rotatably disposed within the brick box 15. A pedal lever 27 is fixedly disposed on the hinge shaft 19. A rubidium magnet 24 is fixedly disposed at the front end of the pedal lever 27 for magnetically attracting the pressure plate 25. A rubber foot pedal 20 is fixedly disposed at the other end of the pedal lever 27. When the brick box cover 14 is stepped on, the downward pressure causes the rubber foot pedal 20 to descend, and the rubidium magnet 24 lifts the pressure plate 25 through magnetic attraction, causing the spring plate 23 to deform. A limit disconnection cross bar 18 is fixedly disposed within the brick box 15 for limiting the deformation of the spring plate 23. When the rubidium magnet 24 continues to rise, the spring plate 23 is blocked by the limit disconnection cross bar 18, so that the rubidium magnet 24 is disengaged from the pressure plate 25. The pressure plate 25 repeatedly strikes the piezoelectric ceramic plate 10 under the elastic potential energy released by the spring plate 23 to generate current. Of course, other trigger structures can also be used.

[0028] In one embodiment, a spring is provided in the brick box 15 for lifting the brick box cover 14 , so that under the gravity of the rubidium magnet 24 , when no one steps on the brick box cover 14 , the rubidium magnet 24 descends and resets to be magnetically attracted to the pressure plate 25 .

[0029] In one embodiment, a plurality of downwardly protruding blocks are provided on the lower end surface of the pressing plate 25 in a rectangular array.

[0030] In one embodiment, in order to increase the current, a plurality of stacked piezoelectric ceramic plates 10 are provided in the brick box 15 , and the piezoelectric ceramic plates 10 are connected in series.

[0031] In one embodiment, in order to improve the conversion efficiency of mechanical pressure in the stacked state, a multi-layer serial piezoelectric module 13 is arranged in the brick box 15, and the multi-layer serial piezoelectric module 13 includes a plurality of piezoelectric ceramic plates 10 and spacer plates 11 for separating the piezoelectric ceramic plates 10, and a multi-layer serial piezoelectric module integrated box 26 that encapsulates the piezoelectric ceramic plates 10 and the spacer plates 11.

[0032] In addition, staggered stacking blocks 12 are provided at intervals on the upper and lower end surfaces of the spacer plate 11, and the staggered stacking blocks 12 on the upper and lower surfaces of the spacer plate 11 are staggered with each other, and the arrangement positions of the staggered stacking blocks 12 are staggered with the protrusions on the lower end surface of the pressure plate 25. In this way, under mechanical pressure, staggered upper and lower deformation pressures are formed on the upper and lower surfaces of the piezoelectric ceramic plate 10, which can effectively and fully utilize the charge of the entire piezoelectric ceramic plate 10.

[0033] This solution greatly improves the efficient utilization of piezoelectric materials in a small space through a stacked design and a checkerboard-like staggered bump design.

[0034] In addition, an overtravel groove 17 is provided on the side of the brick box cover 14 to avoid interference with the limit disconnection cross bar 18 and the hinge shaft 19 when the brick box cover 14 is pressed down. In addition, an anti-slip bump 16 is fixed on the upper end surface of the brick box cover 14.

[0035] The solution of this embodiment can be applied to zebra crossings, which is safer for blind people; it can also be laid on blind paths.

[0036] The embodiments of this specification are merely examples of implementations of the invention and are provided for illustrative purposes only. The scope of protection of the present invention should not be considered limited to the specific embodiments described in these embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by a person of ordinary skill in the art based on the invention.

Claims

1. A pedestrian warning device based on piezoelectric ceramics, characterized in that: The pedestrian warning device includes a brick box and a brick box cover mounted on the brick box, wherein the brick box and the brick box cover form a brick body, wherein a cavity for arranging a piezoelectric ceramic plate is provided in the brick box, wherein the current output end of the piezoelectric ceramic plate is connected to a capacitor, and the output end of the capacitor is connected to a vibration motor for generating high-frequency vibration to provide vibration feedback to pedestrians' feet.

2. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 1, characterized in that: A spring component is also provided in the brick box, and a pressure plate for knocking the piezoelectric ceramic plate is provided at the end of the spring component. A magnetic trigger device is also provided in the brick box for deforming the spring to accumulate elastic potential energy and then trigger it to knock the piezoelectric ceramic plate.

3. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 2, characterized in that: A fixed arm is fixed in the brick box, a spring plate is inserted on the side of the fixed arm, the middle part of the pressure plate is fixed to the end of the spring plate, when the magnetic attraction trigger device magnetically attracts the pressure plate, the spring plate is deformed, and after the magnetic attraction is released, the pressure plate quickly and repeatedly hits the piezoelectric ceramic plate under the action of elastic potential energy.

4. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 3, characterized in that: The magnetic attraction trigger device includes a hinge shaft rotatably arranged in the brick box, a foot lever is fixedly provided on the hinge shaft, a neodymium magnet for magnetically attracting the pressure plate is fixedly provided at the front end of the foot lever, a rubber foot pedal is fixedly provided at the other end of the foot lever, and a limit disconnection cross bar is fixedly provided in the brick box for limiting the deformation of the spring plate.

5. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 4, characterized in that: A spring for lifting the brick box cover is arranged in the brick box. Under the gravity of the rubidium magnet, when no one steps on the brick box cover, the rubidium magnet descends and resets to be magnetically attracted to the pressing plate.

6. A piezoelectric ceramic-based pedestrian warning device according to any one of claims 1 to 5, characterized in that: The lower end surface of the pressing plate is provided with downwardly protruding blocks at intervals in a rectangular array.

7. A piezoelectric ceramic-based pedestrian warning device according to any one of claims 1 to 5, characterized in that: A plurality of stacked piezoelectric ceramic plates are arranged in the brick box, and the piezoelectric ceramic plates are connected in series.

8. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 7, characterized in that: A multi-layer series piezoelectric module is arranged in the brick box, and the multi-layer series piezoelectric module includes a plurality of piezoelectric ceramic plates and spacer plates for separating the piezoelectric ceramic plates, and a multi-layer series piezoelectric module integrated box encapsulating the piezoelectric ceramic plates and the spacer plates.

9. A piezoelectric ceramic-based pedestrian warning device as claimed in claim 8, characterized in that: The upper and lower end surfaces of the spacer plate are provided with offset layer stacking blocks at intervals, and the offset layer stacking blocks on the upper and lower surfaces of the spacer plate are offset from each other, and the arrangement positions of the offset layer stacking blocks are offset from the protrusions on the lower end surface of the pressure plate.

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